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Article

Preliminary Findings on CO2 Capture over APTES-Modified TiO2

by
Agnieszka Wanag
*,
Joanna Kapica-Kozar
,
Agnieszka Sienkiewicz
,
Paulina Rokicka-Konieczna
,
Ewelina Kusiak-Nejman
and
Antoni W. Morawski
Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, Pułaskiego 10, 70-322 Szczecin, Poland
*
Author to whom correspondence should be addressed.
Atmosphere 2022, 13(11), 1878; https://doi.org/10.3390/atmos13111878
Submission received: 16 September 2022 / Revised: 3 November 2022 / Accepted: 8 November 2022 / Published: 10 November 2022
(This article belongs to the Special Issue CO2 Capture Technologies — Utilization and Storage)
Browse Figures
Versions Notes

Abstract

:
In this work, the impact of TiO2 properties on the CO2 adsorption properties of titanium dioxide modified with 3-aminopropyltriethoxysilane (APTES) was presented. The APTES-modified TiO2 materials were obtained by solvothermal process and thermal modification in the argon atmosphere. The prepared adsorbents were characterized by various techniques such as X-ray diffraction (XRD), Fourier transform infrared (DRIFT), thermogravimetric analysis and BET specific surface area measurement. CO2adsorption properties were measured at different temperatures (0, 30, 40, 50 and 60 °C). Additionally, the carbon dioxide cyclic adsorption-desorption measurements were also investigated. The results revealed that modifying TiO2 with APTES is an efficient method of preparing CO2 sorbents. It was found that the CO2 adsorption capacity for the samples after modification with APTES was higher than the sorption capacity for unmodified sorbents. The highest sorption capacity reached TiO2-4 h-120 °C-100 mM-500 °C sample. It was also found that the CO2 adsorption capacity shows excellent cyclic stability and regenerability after 21 adsorption-desorption cycles.

1. Introduction

Carbon dioxide is one of the most important of Earth’s greenhouse gases and its emission is the primary driver of global climate change. It is widely known that to avoid the worst impacts of climate change, the world needs to reduce CO2 emissions or find a new and efficient method for CO2 capture or transformation into useful chemical products. CO2 can be captured by methods and techniques such as chemical absorption, physical adsorption, membrane separation, or chemical looping [1]. Among them, adsorption has become an attractive technology. Qualities of a good adsorbent shall be listed as high adsorption capacity, low cost, high SBET and pore volume as well as long-term stability [2]. Among different sorbents, the most popular are zeolites [3], mesoporous silica [4], porous polymers [5], metal-organic frameworks [6], metal oxide [7] and carbon materials [8]. To improve CO2 adsorption capacity, surface modification of the sorbents has been studied, including, for example, amine modification [9]. The advantage of amine-modified sorbents is the chemical adsorption between the amine groups and CO2. Among different amine compounds using to CO2 adsorbent modification, the most commonly used are tetraethylene pentamine (TEPA) [10,11,12], monoethanolamine (MEA) [13,14], aminopropyl trialkoxy siliane (APTS) [15,16], Polyethyleneimine (PEI) [17,18].
Titanium dioxide, due to its low cost, chemical inertness, non-toxicity, high oxidation efficiency and photostability, is one of the most promising materials extensively applied in many areas. As one of the most widely used photocatalysts, it is especially applied in the photocatalysis process [19]. However, TiO2 also finds application as a pigment [20], medical devices coating [21], gas sensors [22], and also as an adsorbent [23]. Furthermore, there are also some publications concerning CO2 adsorption on the TiO2 surface [24,25,26]. Many efforts have been dedicated to the further improvement of the physico-chemical properties of TiO2 such as higher SBET and smaller crystallite size of anatase and rutile. In this case, a great deal of modification has been carried out and much attention has especially been paid to the doping of pure TiO2 with either cations (i.e., Al, Ag, Pt, Co, Fe or Si) or anions (i.e., N, C, I or S) [27]. Currently, one of the promising solutions for the modification of TiO2 is using silicon. Modification with silicon can increase the specific surface area, reduce particle size, and hinder the anatase-to-rutile phase transition [28,29]. One of the sources of silicon is organosilane coupling agents, for example 3-aminopropyltriethoxysilane (APTES).
Taking the above into account, the present study aimed to prepare APTES-modified titania as a CO2 adsorbent. Using APTES as a TiO2 modifier was mainly aimed at improving physico-chemical properties of TiO2 which have an impact on better CO2 adsorption. The presented research also determines the influence of the calcination temperature on the structural and adsorption properties of tested materials.

2. Materials and Methods

2.1. Materials and Reagents

The TiO2used in this study was obtained from slurry titanium dioxide produced by sulphate technology from Chemical Plant Grupa Azoty Zakłady Chemiczne “Police” S.A. (Police, Poland). Before modification, the slurry titanium dioxidewas rinsed with an aqueous solution of ammonia water (25 % pure p.a., Firma Chempur®, Piekary Śląskie, Poland) to remove the residues of sulfuric compounds. This process was thoroughly described in our previous work [30]. As a modifier of TiO2 was used 3-aminopropyltriethoxysilane (APTES) (C9H23NO3Si, purity ≥ 98%, 221.37 g/mol, Merck KGaA, (Darmstadt, Germany). Ethanol (purity 96%, pure p.a.) purchased from P.P.H. “STANLAB” Sp.J. (Lublin, Poland) was used as a solvent of APTES.

2.2. Synthesis of APTES-Modified TiO2

The preparation procedure of APTES-modified TiO2 nanomaterials was described in detail in our previous article [31]. For samples shown in this article, the APTES concentration equals 100 mM. Obtained samples were heated in an argon atmosphere (purity 5.0, Messer Polska Sp. z o.o., Chorzów, Poland) in the GHC 12/900 horizontal furnace (Carbolite Gero, Ltd., Hope, UK). The samples were calcinated at temperatures ranging from 300 °C to 700 °C (Δt = 200 °C) for 4 h. The argon flow was 180 mL/min. After that, the furnace was slowly cooled down to room temperature. Obtained samples are denoted as TiO2-4 h-120 °C-100 mM-Ar-T, where T is the calcination temperature. For comparison, pure TiO2 was also heated at the same temperature. The reference samples were named TiO2-Ar-T,where T is the calcination temperature.

2.3. Characterization Methods

The prepared nanomaterials were subjected to functional groups analysis using FT-IR-4200 spectrometer (JASCO International Co., Ltd., Tokyo,Japan) equipped with DiffusIR accessory (PIKE Technologies, Fitchburg, USA). The samples were scanned in the spectral range of 4000–400 cm−1 with a resolution of 4.0 cm−1 averaging 100 scans. X-ray diffraction (XRD) patterns were collected using a powder X-ray diffractometer (Malvern PANalytical Ltd., Malvern, United Kingdom) with Cu Kα radiation (λ = 1.54056 Å). The mean crystallite sizes of the samples were calculated according to Scherrer’s equation, while the PDF-4+  2014 International Centre for Diffraction Data database (04-002-8296 PDF4+ card for anatase and 04-005-5923 PDF4+ card for rutile) was used for identification of the phase composition. TiO2 anatase over rutile ratio was calculated from [32]:
a n a t a s e   c o n t e n t = 1 1 + 1.26 ( I R + I A )
where IA and IR are the diffraction intensities of the (1 0 1) anatase and (1 1 0) rutile crystalline phases at 2θ = 25.3 and 27.4°, respectively.
The SBET surface area and pore volume of nanomaterials were calculated from the nitrogen adsorption-desorption measurements at 77 K carried out in QUADRASORB evoTM Gas Sorption analyzer (Anton Paar GmbH, Graz, Austria). Prior to measurements, all materials were degassed for 16 h at 100 °C under a high vacuum to pre-clean the surface of the tested sample. The single-point value determined the total pore volume from the nitrogen adsorption isotherms at a relative pressure p/p0 = 0.99. Micropore volume was estimated using the Dubinin–Radushkevich method, and mesopore volume was determined as the difference between Vtotal and Vmicro. Thermogravimetric analysis (TG) and differential thermogravimetry (DTG) was performed in a NETZSCH STA 449 F3 Jupiter (Erich NETZSCH GmbH & Co. Holding KG, Selb, Germany). Samples (about 10 mg) were heated in an open Al2O3 crucible with a corresponding empty referent pan. The samples were heated from room temperature to 700 °C at a heating rate of 10 °C/min under a flow of air atmosphere (70 mL/min).

2.4. CO2 Sorption Measurement

Carbon dioxide adsorption isotherms at 0 °C and 25 °C were measured using QUADRASORB evoTM automatic system (Anton Paar GmbH, Graz, Austria) in the pressure range between 0.01 and 0.98 bar. Before each adsorption experiment, samples were outgassed at 100 °C under a vacuum of 1 × 10−5 mbar for 16 h using a MasterPrep multi-zone flow/vacuum degasser from Quantachrome Instruments (Anton Paar GmbH, Graz, Austria).
The CO2 adsorption and desorption performance at different temperatures were measured using a NETZSCH STA 449 F3 Jupiter (Erich NETZSCH GmbH & Co. Holding KG, Selb, Germany). An approximately 10 mg sample was placed in an open corundum crucible and pretreated at 105 °C for 60 min under argon flowing at 70 mL/min to remove pre-adsorbed CO2 and moisture. After 60 min, the argon flow was reduced to 10 mL/min, switched on pure CO2 and held for 60 min at 30 °C at a flow of 90 mL/min. After adsorption, the gas was switched from CO2 to argon (70 mL/min), and the temperature increased to 105 °C to desorb the CO2. Subsequently, the CO2 adsorption temperature was increased to 40, 50, and 60 °C. After each adsorption measurement, the gas was switched back to pure argon at 70 mL/min to perform desorption at 105 °C for 60 min.
The carbon dioxide cyclic adsorption-desorption measurements were investigated using a thermogravimetric analyzer NETZSCH STA 449 F3 Jupiter (Erich NETZSCH GmbH & Co. Holding KG, Selb, Germany). The CO2 adsorption was carried out in the same way as described above, with the difference this the measurement of sorption CO2 was carried out at 21 consecutive adsorption-desorption cycles at the temperature of 30 °C. The CO2 adsorption capacities were calculated based on the mass gain after CO2 adsorption regarding the initial sample mass.

3. Results

3.1. Characterization of Materials

The DRIFT spectra of APTES-modified TiO2 after heat treatment are presented in Figure 1, while reference samples were presented and described in detail in our previous work [33]. The FT-IR/DR spectra present the same bands typical for TiO2. A wide band from 3700 cm−1 to 2500 cm−1 is assigned to stretching vibrations of surface –OH groups [34]. As the temperature increases, a decrease in the intensity of these bands can be observed due to the changes in the amount of surface hydroxyl groups [35]. A narrow band at 1620 cm−1 is associated with the molecular water bending modes [36]. On all spectra, the presence of the intensive band at around 950 cm−1 was found. This band is characteristic of the self-absorption of titania [37]. The characteristic bands from APTES are also noted. The bending and stretching contributions of the alkyl groups [(CHn)] are located at around 2900 cm−1 and 2885 cm−1 [38,39]. However, at 1600 cm−1 the asymmetric –NH3+ deformation modes are observed [40,41]. At 1360 cm−1, there is a localized low-intensity band ascribed to C−N bonds [42]. The bands at around 950 cm−1 and 920 cm−1 are characteristic of the stretching vibrations of Ti–O–Si bonds [43]. These three characteristics of APTES bands are not observed for samples calcined above 300 °C because they were not permanently bonded to the TiO2 surface. However, the band at around 1160 cm−1 and 1080 cm−1 characteristic of the Si−O−Si stretching vibrations and Si–O–C stretching mode, respectively, are noted for all samples [35,44].
The X-ray diffraction patterns of the APTES-synthesized materials are shown in Figure 2. However, the structural characteristics of reference samples were presented in detail in our previous work [33]. The phase composition and crystallite size of anatase and rutile in all samples are listed in Table 1. According to the data present in Figure 2 and Table 1, all APTES/TiO2 materials consist mainly of anatase phase (96%) with the characteristic reflections (101), (004), (200), (105), (211), (204), (116), (220), (215) (JCPDS 01-070-7348) located at 25.3, 37.8, 48.1, 53.9, 55.1, 62.7, 68.9, 70.3 and 75.1°, respectively. Some characteristic reflections for rutile phase (110), (101) and (111) (JCPDS 01-076-0318) located at 27.4, 36.0 and 41.2° are also noted. Comparing these results with the results for reference materials, especially the samples calcined at 700 °C (see our previous work [24]), it can be concluded that silicon from APTES had an important influence on the suppression of anatase-to-rutile phase transformation during calcination [45,46]. The influence of silicon on the crystallite size is also observed. For reference materials, the crystallite size was 14–22 nm for anatase and 51->100 nm for rutile, while for APTES-modified TiO2 samples it was 15–18 nm and 43–73 nm, respectively. Thus, materials heated at the same temperature but after APTES modification are characterized by the smaller crystallites size of both anatase and rutile. Our observation is consistent with results noted by other researchers [28,47]. Silicon can effectively prevent the growth of the crystallites size during calcination.
The specific surface area and total pore volume are listed in Table 2. Based on the presented data, all tested APTES synthesized samples are mesoporous materials. Only the TiO2-Ar-700 °C sample is microporous. The increase in calcination temperature from 300 to 700 °C significantly reduced specific surface area and pore size distribution. The SBET of the samples decreases from 178 m2/g at 300 °C to 108 m2/g at 700 °C, respectively. It is a typical phenomenon due to the sintering and aggregation of TiO2 particles during temperature modification [48]. However, it should be noted that samples after modification show significantly higher SBET than reference samples due to the effective inhibition of the growth of the crystallite size of TiO2 by silicon presence in samples after APTES modification.
The thermal analysis TG/DTG profiles of the unmodified and APTES-modified samples are illustrated in Figure 3a,b and Figure 4a,b. As can be seen from the recorded curves, the total weight loss for the unmodified samples decreases with increasing calcination temperature reaching 1.95, 1.77 and 0.52%, which is accompanied by the decomposition peaks screened between 30–210 °C, reaching the maximum amount with the DTG peak at ca. 96, 128 and 149 °C, respectively. This mass change is attributed to the vaporization of free water and water bonded to the cations by hydrogen bonding [49,50]. At the temperature range of 200–390 °C, we observed that a second weight loss can be correlated with the anatase-to-rutile transformation [51]. In the case of the APTES-modified sample (Figure 4a,b), we can also observe a mass change which is attributed to the removal of physically adsorbed water in the temperature range of 30–170 °C at the maximum at above 90 °C, reaching a weight loss of 3.85, 2.56 and 1.77% for the TiO2-4 h-120-100 mM-300, TiO2-4 h-120-100 mM-500 and TiO2-4 h-120-100 mM-700, respectively.
Additionally, the strong decomposition peaks between the 200–390 °C for the TiO2-4 h-120-100 m-300 samples, corresponding to the differential thermogravimetric (DTG) profile with a maximum at 310 °C and the total weight loss reached 3.25%, respectively, is observed. These decomposition peaks could be attributed to the adsorbed silanes hydrogen bonded to the surface hydroxyl groups [52,53,54]. In the case of samples TiO2-4 h-120-100 m-500 and TiO2-4 h-120-100 m-700, we can note much less sharp but wider decomposition peaks at the same temperature range. It is also worth noticing that the increase in the calcination temperature of APTES-modified TiO2 samples results in a decrease in the total weight loss from 1,65% and 1,28% for the TiO2-4 h-120-100 mM-500 and TiO2-4 h-120-100 m-700 samples, respectively. It can be explained as follows: during the calcination, free silanol on the surface was dehydrated and translated into hydrogen-bonded silanol [46]. Furthermore, the results also show that as the calcining temperature increases, the initial and maximum rate decomposition (DTG profile) temperature shifted towards lower values, reaching the maximum at ca. 196 and 263 °C for TiO2-4 h-120-100 m-500 and 243 °C for TiO2-4 h-120-100 m-700 samples. The last decomposition reaction, which occurs between 400–550 °C, reaches the maximum at 438 °C (DTG profile) and the total weight losses of 1.30%, 0.90% and 0.47% for the samples calcined with 300, 500 and 700 °C, respectively, are due to the chemically grafted silane [55].

3.2. CO2 Adsorption Properties

The calculated values of carbon dioxide adsorption capacity at 0 °C for the samples calcined with the various temperatures before and after modification via APTES are summarized in Table 2 and graphically shown in Figure 5a,b. Similar values of the CO2 adsorption capacity (0.36 mmol/g) at 0 °C for an unmodified material were noticed for the samples calcined at 300 °C and 500 °C. The adsorption capacity drastically decreased to 700 °C with the temperature calcination increase and reached 0.09 mmol/g. The decrease in the sorption capacity with the increase in the calcination temperature can be explained by considering the properties of the porous structure of the samples (Table 1). The specific surface area (SBET), total pore volume (Vtotal) and mesopore volume (Vmeso) for TiO2-Ar-300 and TiO2-Ar-500 was 112 m2/g, 0.31 cm3/g, 0.23 cm3/g and 75 m2/g 0.22 cm3/g, 0.19 cm3/g, respectively. In the case of the sample calcined at 700 °C (TiO2-Ar-700), the specific surface area decreased to 23 m2/g, and total pore volume and mesopore volume decreased to 0.10 cm3/g and 0.01 cm3/g, accordingly.
The sorption capacity changed significantly after modification via APTES and reached for TiO2-4 h-120-100 mM-300, TiO2-4 h-120-100 mM-500 and TiO2-4 h-120-100 mM-700 0.47 mmol/g, 0.56 mmol/g, 0.33 mmol/g and it is 29%, 56% and 272%, respectively, higher than the same samples before being modified with APTES (Figure 5b). Moreover, we can see that the modification process leads to a significant increase in the structural parameters. The specific surface area increased to 178 m2/g for the TiO2-4 h-120-100 mM-300 sample, TiO2-4 h-120-100 mM-500 and TiO2-4 h-120-100 mM-700 samples increased to 153 m2/g and 108 m2/g, respectively, that is 1.6, 2.0 and 4.7 times higher than the same samples before APTES-modified.
The APTES-modified TiO2 samples were selected for CO2 sorption at different temperatures due to higher CO2 sorption capacity at 0 °C compared to unmodified samples. The results of these experiments are presented in Figure 6. The sorption results at 30, 40, 50 and 60 °C show the same tendency that occurs in the adsorption at 0 °C. From the graph, it can be observed that the effect of increasing the temperature is to decrease the adsorption capacity (what was expected) because it is typical behavior showing the effect of temperature on CO2 adsorption. For instance, the highest CO2 sorption capacity at 30 °C (0.30 mmol/g) exhibited TiO2-4 h-120-100 mM-500 sample, then sorption capacity it reduces by 0,04 mmol/g, 0,06 mmol/g and 0,11 mmol/g when the adsorption temperature increased from 40 °C to 60 °C. This corresponds to an 8%, 12% and 16% decrease compared to the CO2 adsorption capacity at 30 °C. This can be explained by the fact that an increase in adsorption temperature stands for high gas molecule energy. Increasing energy allows gaseous molecules to diffuse at a greater rate, in turn reducing the chance for the CO2 to be restrained or trapped by fixed energy adsorption sites on the adsorbent surface [56,57,58,59].
The cyclic adsorption-desorption behavior was carried out for the TiO2-4 h-120-100 mM-500 sample that achieved the highest CO2 sorption capacity at both 0 °C and 30, 40, 50 and 60 °C among all APTES-modified TiO2 samples and calcined with various temperatures. The calculated CO2 capacities during twenty-one consecutive adsorption-desorption cycles at 30 °C are shown in Figure 7. It could be seen that the CO2 adsorption capacity shows excellent cyclic stability and regenerability after 21 adsorption-desorption cycles, which is crucial for practical application.

4. Conclusions

APTES-modified TiO2 nanomaterials for CO2 adsorption were successfully prepared. The materials were obtained by solvothermal process and thermal modification in the argon atmosphere at different temperatures (from 300 °C to 700 °C). It was confirmed that silicon can effectively prevent titania grains’ growth during calcination and suppress the decreases in SBETand the pore size of samples. Furthermore, it was found that these parameters had an essential influence on the CO2 adsorption properties of studied materials. After modification via APTES, the sorption capacity of samples was significantly changed and was 29%, 56% and 272% higher than the samples without modification with APTES. The highest sorption capacity reached TiO2-4 h-120 °C-100 mM-500 °C sample. For this material, the CO2 adsorption capacity also shows excellent cyclic stability and regenerability after 21 adsorption-desorption cycles, which are crucial for practical application.

Author Contributions

Conceptualization: A.W. and J.K.-K.; investigation: A.W., J.K.-K. and A.S.; data curation: E.K.-N. and A.W.M.; writing—original draft preparation: A.W. and J.K.-K.; writing—review and editing: A.W.M., E.K.-N. and P.R.-K.; project administration: A.W.M.; funding acquisition: A.W.M. All authors have read and agreed to the published version of the manuscript.

Funding

This work was supported by grant 2017/27/B/ST8/02007 from the National Science Centre, Poland.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

The data presented in this study are available on request from thecorresponding author.

Conflicts of Interest

The authors declare no conflict of interest.

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Atmosphere 13 01878 g001 550
Figure 1. DRIFT spectra of APTES-modified TiO2 with zoom in wavenumber in the range of 2500–4000 cm−1.
Figure 1. DRIFT spectra of APTES-modified TiO2 with zoom in wavenumber in the range of 2500–4000 cm−1.
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Figure 2. XRD patterns of APTES-modified TiO2.
Figure 2. XRD patterns of APTES-modified TiO2.
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Figure 3. (a) TG and (b) DTG curves of the unmodified samples calcined at various temperatures.
Figure 3. (a) TG and (b) DTG curves of the unmodified samples calcined at various temperatures.
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Figure 4. (a) TG and (b) DTG curves of the APTES modified nanomaterials.
Figure 4. (a) TG and (b) DTG curves of the APTES modified nanomaterials.
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Figure 5. CO2 adsorption capacity recorded at 0 °C of (a) unmodified samples and (b) samples modified with APTES calcined at various temperatures.
Figure 5. CO2 adsorption capacity recorded at 0 °C of (a) unmodified samples and (b) samples modified with APTES calcined at various temperatures.
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Figure 6. Temperature dependence of CO2 adsorption capacity.
Figure 6. Temperature dependence of CO2 adsorption capacity.
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Figure 7. Cyclic stability of CO2 adsorption-desorption for a TiO2-4 h-120-100 mM-500 sample at 30 °C.
Figure 7. Cyclic stability of CO2 adsorption-desorption for a TiO2-4 h-120-100 mM-500 sample at 30 °C.
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Table
Table 1. XRD phase composition and average crystallite size of APTES-modified TiO2 as well as reference samples.
Table 1. XRD phase composition and average crystallite size of APTES-modified TiO2 as well as reference samples.
Sample NameAnatase
in Crystallite Phase [%]		Anatase Crystallite Size [nm]Rutile
in Crystallite Phase [%]		Rutile Crystallite Size [nm]
TiO2-Ar-300 °C9614451
TiO2-Ar-500 °C9518541
TiO2-Ar-700 °C882212>100
TiO2-4 h-120 °C-100 mM-300 °C9615446
TiO2-4 h-120 °C-100 mM-500 °C9615445
TiO2-4 h-120 °C-100 mM-700 °C9618473
Table
Table 2. Specific surface area andpore volume distribution ofAPTES-modified TiO2 as well as reference samples.
Table 2. Specific surface area andpore volume distribution ofAPTES-modified TiO2 as well as reference samples.
Sample NameSBET [m2/g]Vtotala
[cm3/g]		Vmicrob [cm3/g]Vmesoc
[cm3/g]		CO2 Adsorption
at 0 °C
[mmol/g]		CO2 Adsorption
at 25 °C
[mmol/g]
TiO2-Ar-300 °C1120.310.040.270.360.25
TiO2-Ar-500 °C750.220.030.190.360.16
TiO2-Ar-700 °C230.100.010.090.090.07
TiO2-4 h-120 °C-100 mM-300 °C1780.260.060.200.470.29
TiO2-4 h-120 °C-100 mM-500 °C1530.280.060.220.560.29
TiO2-4 h-120 °C-100 mM-700 °C1080.270.040.230.330.15
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Wanag, A.; Kapica-Kozar, J.; Sienkiewicz, A.; Rokicka-Konieczna, P.; Kusiak-Nejman, E.; Morawski, A.W. Preliminary Findings on CO2 Capture over APTES-Modified TiO2. Atmosphere 2022, 13, 1878. https://doi.org/10.3390/atmos13111878

AMA Style

Wanag A, Kapica-Kozar J, Sienkiewicz A, Rokicka-Konieczna P, Kusiak-Nejman E, Morawski AW. Preliminary Findings on CO2 Capture over APTES-Modified TiO2. Atmosphere. 2022; 13(11):1878. https://doi.org/10.3390/atmos13111878

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Wanag, Agnieszka, Joanna Kapica-Kozar, Agnieszka Sienkiewicz, Paulina Rokicka-Konieczna, Ewelina Kusiak-Nejman, and Antoni W. Morawski. 2022. "Preliminary Findings on CO2 Capture over APTES-Modified TiO2" Atmosphere 13, no. 11: 1878. https://doi.org/10.3390/atmos13111878

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