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Chem. Proc., 2025, ECCS 2025

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Number of Papers: 5
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6 pages, 2223 KiB  
Proceeding Paper
Photocatalytic Degradation of Dyes Using TpPa-COF-Cl2 Membrane
by Mayu Kawaguchi, Hideyuki Katsumata, Ikki Tateishi, Mai Furukawa and Satoshi Kaneco
Chem. Proc. 2025, 17(1), 1; https://doi.org/10.3390/chemproc2025017001 - 4 Jul 2025
Viewed by 339
Abstract
Covalent organic frameworks (COFs) are photocatalysts composed of covalent bonds of light elements and free of toxic metals. COFs are highly active against dyes. Furthermore, we aimed to improve the utility of COFs by making them into membranes. In this study, by utilizing [...] Read more.
Covalent organic frameworks (COFs) are photocatalysts composed of covalent bonds of light elements and free of toxic metals. COFs are highly active against dyes. Furthermore, we aimed to improve the utility of COFs by making them into membranes. In this study, by utilizing the cross-linked structure of calcium alginate, we succeeded in forming the photocatalyst TpPa-COF-Cl2 into a membrane without destroying its structure. This was confirmed by characterization such as FT-IR. In addition, methyl orange was decolorized at 450 nm, confirming the photocatalytic activity of the membrane. Full article
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6 pages, 657 KiB  
Proceeding Paper
Extraction of Lignin from Sawdust (Chlorophora excelsa)
by Abraham Thomas, Fadimatu N. Dabai, Benjamin O. Aderemi and Yahaya M. Sani
Chem. Proc. 2025, 17(1), 2; https://doi.org/10.3390/chemproc2025017002 - 16 Jul 2025
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Abstract
Sawdust is an abundant source of lignocellulosic biomass, presenting a sustainable alternative to fossil fuels for producing aromatics, fuels, and chemicals. Lignin, a crucial component, can be depolymerized into valuable aromatics or used for polymer synthesis due to its multiple hydroxyl groups. This [...] Read more.
Sawdust is an abundant source of lignocellulosic biomass, presenting a sustainable alternative to fossil fuels for producing aromatics, fuels, and chemicals. Lignin, a crucial component, can be depolymerized into valuable aromatics or used for polymer synthesis due to its multiple hydroxyl groups. This study focuses on extracting lignin from Chlorophora excelsa sawdust via organosolv technology. The characterization of sawdust revealed 41.15% cellulose, 28.63% hemicellulose, and 26.13% lignin. The extraction process involved treating sawdust at varying temperatures (100–200 °C) with an ethanol–water solution and sulfuric acid. The optimal yield of 49.81% lignin occurred at 160 °C, confirming the chemical properties and composition of the extracted lignin. Full article
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8 pages, 2473 KiB  
Proceeding Paper
Development of Photocatalytic Reduction Method of Cr(VI) with Modified g-C3N4 
by Miyu Sato, Mai Furukawa, Ikki Tateishi, Hideyuki Katsumata and Satoshi Kaneco
Chem. Proc. 2025, 17(1), 3; https://doi.org/10.3390/chemproc2025017003 - 29 Jul 2025
Viewed by 128
Abstract
Hexavalent chromium (Cr(VI)), a common contaminant in industrial wastewater, poses severe health risks due to its carcinogenic and mutagenic properties. Consequently, the development of efficient and environmentally friendly methods to reduce Cr(VI) to the less toxic trivalent chromium (Cr(III)) is of great importance. [...] Read more.
Hexavalent chromium (Cr(VI)), a common contaminant in industrial wastewater, poses severe health risks due to its carcinogenic and mutagenic properties. Consequently, the development of efficient and environmentally friendly methods to reduce Cr(VI) to the less toxic trivalent chromium (Cr(III)) is of great importance. In this study, we present a cost-effective photocatalytic approach using graphitic carbon nitride (g-C3N4) modified with 1,3,5-trihydroxybenzene via one-step thermal condensation. The modified photo-catalyst exhibited improved surface area, porosity, visible-light absorption, and a narrowed band gap, all of which contributed to enhanced charge separation. As a result, nearly complete reduction in Cr(VI) was achieved within 90 min under visible-light irradiation. Further optimization of catalyst dosage and EDTA concentration gave even higher reduction efficiency. This work offers a promising strategy for the design of high-performance photocatalysts for environmental remediation. Full article
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9 pages, 1841 KiB  
Proceeding Paper
Cu-Modified Zn6In2S9 Photocatalyst for Hydrogen Production Under Visible-Light Irradiation
by Shota Fukuishi, Hideyuki Katsumata, Ikki Tateishi, Mai Furukawa and Satoshi Kaneco
Chem. Proc. 2025, 17(1), 4; https://doi.org/10.3390/chemproc2025017004 - 29 Jul 2025
Viewed by 112
Abstract
Copper-doped indium zinc sulfides were synthesized by heating and stirring a mixture of zinc chloride, indium chloride tetrahydrate, thioacetamide, and copper chloride at 180 °C for 18 h. Among these, Zn5.7Cu0.3In2S9 exhibited a hydrogen-producing activity of [...] Read more.
Copper-doped indium zinc sulfides were synthesized by heating and stirring a mixture of zinc chloride, indium chloride tetrahydrate, thioacetamide, and copper chloride at 180 °C for 18 h. Among these, Zn5.7Cu0.3In2S9 exhibited a hydrogen-producing activity of 1660 μmol/g·h, which was approximately five times higher than that of pristine indium zinc sulfide. Therefore, the catalyst was characterized to investigate the effect of Cu addition. PL results revealed that the incorporation of Cu reduced the fluorescence intensity, indicating suppressed recombination of photogenerated electron–hole pairs. DRS showed that the Cu addition enhanced optical absorption in the visible-light region and narrowed the band gap. These findings suggest that the incorporation of copper into indium zinc sulfide improves its photocatalytic activity. Full article
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8 pages, 2685 KiB  
Proceeding Paper
Dye Decolorization Under Visible Light Irradiation Using Bismuth Subcarbonate
by Kentaro Yamauchi, Mai Furukawa, Ikki Tateishi, Hideyuki Katsumata and Satoshi Kaneco
Chem. Proc. 2025, 17(1), 5; https://doi.org/10.3390/chemproc2025017005 - 4 Aug 2025
Abstract
Commercially available bismuth subcarbonate (Bi2O2CO3) was treated with nitric acid and the surfactant cetyltrimethylammonium bromide. The treated catalysts exhibited enhanced photocatalytic activity compared to pure Bi2O2CO3 in the decolorization of rhodamine B [...] Read more.
Commercially available bismuth subcarbonate (Bi2O2CO3) was treated with nitric acid and the surfactant cetyltrimethylammonium bromide. The treated catalysts exhibited enhanced photocatalytic activity compared to pure Bi2O2CO3 in the decolorization of rhodamine B (RhB) under visible light irradiation. The absorbance at 554 nm gradually decreased over time and disappeared completely within 80 min. The crystal structure, morphology, and optical properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Vis diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The improved photocatalytic activity of the treated catalysts was attributed to partial carbonate removal and the formation of Bi5+ species. Scavenger experiments indicated that superoxide radicals (·O2−) and photogenerated holes (h+) played significant roles in the photocatalytic decolorization of RhB. Full article
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