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Advanced Technologies and Materials for Polluted Water Remediation
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Advanced Technologies and Materials for Polluted Water Remediation

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Wastewater Treatment and Reuse".

Deadline for manuscript submissions: closed (25 June 2022) | Viewed by 10825

Special Issue Editor

Prof. Dr. Liuchun Zheng

E-Mail Website
Guest Editor
School of Environment, South China Normal University, Guangzhou, China
Interests: heavy metal; organic pollutants; adsorption; membrane separation; technology; mechanism; theoretical calculation

Special Issue Information

Dear Colleagues,

Water is an indispensable resource in human life, industrial and agricultural production. As an important part of the ecological environment, water is an important guarantee for the healthy and sustainable development of human beings and the ecological environment. However, with the development of the social economy and the acceleration of urbanization, water pollution is becoming more and more serious, and water security is obviously under threat. Therefore, seeking efficient remediation methods for polluted water has become an important research content. Meanwhile, the development of high-performance and cost-effective mate-rials is also crucial for water pollution control. These materials can be adsorbents, membrane separation materials, or biomaterials. In any case, the corresponding water treatment technology of these materials is not only the hot spot concerned by the majority of researchers but also the technical information expected by many readers.

Prof. Dr. Liuchun Zheng
Guest Editor

Manuscript Submission Information

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Keywords

  • heavy metal
  • organic pollutants
  • adsorption
  • membrane separation
  • technology
  • mechanism
  • theoretical calculation

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Published Papers (3 papers)

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Research

15 pages, 5522 KiB  
Article
Preparation of Powdered Activated Carbon Composite Material and Its Adsorption Performance and Mechanisms for Removing RhB
by Yarui Song, Kaisheng Wang, Fajun Zhao, Zhaoxi Du, Biao Zhong and Guangyu An
Water 2022, 14(19), 3048; https://doi.org/10.3390/w14193048 - 27 Sep 2022
Cited by 11 | Viewed by 2715
Abstract
For solving the problem of low efficiency about dyes and slow precipitation rate for powdered activated carbon (PAC), this study successfully prepares a kind of powdered activated carbon-based composites (PACMC) to remove Rhodamine B (RhB) in wastewater as an adsorbent. PACMC derived from [...] Read more.
For solving the problem of low efficiency about dyes and slow precipitation rate for powdered activated carbon (PAC), this study successfully prepares a kind of powdered activated carbon-based composites (PACMC) to remove Rhodamine B (RhB) in wastewater as an adsorbent. PACMC derived from potassium humate and polyaluminium chloride (PACl)-modified PAC were fabricated via a chemical precipitation method. We confirmed the micro-morphology and chemical composition of PACMC by scanning electron microscopy energy-dispersive X-ray spectrometer (SEM-EDS) and fourier infrared spectroscopy (FT-IR), certifying that PACMC was synthesized by chemical reaction of raw materials. PACMC has layered porous structure and functional groups, which is beneficial to the transport and diffusion of RhB molecules. The specific surface area (10.098 m2·g−1) and average particle size (142.9 µm) of PACMC and the specific surface area (710.1 m2·g−1) and average particle size (11.9 µm) of PAC were measured. By comparison, it can be seen that PACMC has larger average particle size conducive to solid–liquid separation. The static adsorption experiments were carried out to investigate the adsorption properties of RhB by PACMC. The results showed that the adsorption capacity of PACMC for RhB was 2–3 times as high as that of PAC. The pH value of the solution had a significant effect on the adsorption of RhB by PACMC and the maximum adsorption was observed at pH = 4.5 (qe = 28.56 mg·g−1, C0 = 40 mg·L−1). The adsorption of RhB by PACMC can be well described by the pseudo-second-order kinetics. The kinetic results revealed that the adsorption process involved several steps, where the chemical adsorption and intra-particle diffusion both played the important roles. The isothermal adsorption data were in accordance with the Dubinin–Radushkevich model, which indicated that the adsorption was dominated by the chemisorption mechanism. Therefore, the adsorption mechanisms included chemical binding/chelation effect and electrostatic adsorption effect. Full article
(This article belongs to the Special Issue Advanced Technologies and Materials for Polluted Water Remediation)
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25 pages, 6416 KiB  
Article
Comparison of Adsorptive Removal of Fluoride from Water by Different Adsorbents under Laboratory and Real Conditions
by Agostina Chiavola, Emilio D’Amato and Camilla Di Marcantonio
Water 2022, 14(9), 1423; https://doi.org/10.3390/w14091423 - 29 Apr 2022
Cited by 20 | Viewed by 3227
Abstract
The fluoride removal capability of six different adsorbents (four commercial, i.e., titanium dioxide-TiO2, ArsenXPnp-A33E, granular activated carbon (GAC) and granular ferric hydroxide (GFH), and two laboratory media, i.e., nano-fine media and nano-granular media) was determined under batch conditions using [...] Read more.
The fluoride removal capability of six different adsorbents (four commercial, i.e., titanium dioxide-TiO2, ArsenXPnp-A33E, granular activated carbon (GAC) and granular ferric hydroxide (GFH), and two laboratory media, i.e., nano-fine media and nano-granular media) was determined under batch conditions using synthetic and real contaminated water containing arsenic and vanadium. The kinetic and equilibrium characteristics of the adsorption process under different operating conditions (pH value, initial fluoride concentration, adsorbent dosage, water composition) were obtained. Among the tested adsorbents, TiO2 showed the highest adsorption capacity; it was also capable of reducing fluoride concentration below the limit set for drinking water without pH control. TiO2 still remained the best adsorbent in the treatment of real contaminated groundwater, where it was also capable of efficiently removing both arsenic and vanadium. The other adsorbents were capable of achieving the same fluoride reduction, although only for acid pH. The nano-sized laboratory media showed an adsorption removal efficiency below that of TiO2 but superior to that of A33E, GAC and GFH. Among the investigated parameters, the removal efficiency was mainly affected by adsorbent dosage and pH. The pseudo-second order model best fitted the kinetic experimental data of all the media. The maximum adsorption capacity predicted by this model was in the following decreasing order: TiO2 > A33E > GAC > GFH. The removal capability of all the media drastically decreased due to the presence of competitive ions and unfavorable pH conditions. The best isotherm model changed depending on the type of adsorbent and pH conditions. Full article
(This article belongs to the Special Issue Advanced Technologies and Materials for Polluted Water Remediation)
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14 pages, 13528 KiB  
Article
Enhanced Ozone Oxidation by a Novel Fe/Mn@γ−Al2O3 Nanocatalyst: The Role of Hydroxyl Radical and Singlet Oxygen
by Chen Liang, Xinhao Luo and Yongyou Hu
Water 2022, 14(1), 19; https://doi.org/10.3390/w14010019 - 22 Dec 2021
Cited by 12 | Viewed by 4326
Abstract
Catalytic ozonation is a potential alternative to address the dye wastewater effluent, and developing an effective catalyst for catalyzing ozone is desired. In this study, a novel Fe/Mn@γ−Al2O3 nanomaterial was prepared and successfully utilized for catalytic ozonation toward [...] Read more.
Catalytic ozonation is a potential alternative to address the dye wastewater effluent, and developing an effective catalyst for catalyzing ozone is desired. In this study, a novel Fe/Mn@γ−Al2O3 nanomaterial was prepared and successfully utilized for catalytic ozonation toward dye wastewater effluent components (dimethyl phthalate and 1−naphthol). The synthesized Fe/Mn@γ−Al2O3 exhibited superior activity in catalytic ozonation of dimethyl phthalate and 1−naphthol in contrast to Fe@γ−Al2O3 and Mn@γ−Al2O3. Quench and probe tests indicated that HO° contributed to almost all removal of dimethyl phthalate, whereas O3, HO°, and singlet oxygen participated in the degradation of 1−naphthol in the Fe/Mn@γ−Al2O3/O3 system. The results of XPS, FT−IR, and EPR suggested that HO° and singlet oxygen were generated from the valence variations of Fe(II/III)and Mn(III/IV). Moreover, the Fe/Mn@γ−Al2O3/O3 system could also have excellent efficacy in actual water samples, including dye wastewater effluent. This study presents an efficient ozone catalyst to purify dye wastewater effluent and deepens the comprehension of the role and formation of reactive species involved in the catalytic ozonation system. Full article
(This article belongs to the Special Issue Advanced Technologies and Materials for Polluted Water Remediation)
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