Removal behavior and mechanism of silver from low concentration wastewater using cellulose aerogel modified by thiosemicarbazide |
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| Authors: | Yifan Liu Ruihan Pei Yuancai Lv Chunxiang Lin Jianhui Huang Minghua Liu |
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| Affiliation: | 1. College of Chemical Engineering, Fuzhou University, Fuzhou, China;2. Fujian Provincial Engineering Research Center of Rural Waste Recycling Technology, College of Environment & Resources, Fuzhou University, Fuzhou, China;3. Fujian Provincial Key Laboratory of Ecology-Toxicological Effects and Control for Emerging Contaminants, College of Environmental and Biological Engineering, Putian University, Putian, China |
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| Abstract: | Due to the low concentration of silver in water, most of the cellulose adsorbents exhibited low removal efficiency, which greatly limited their practical applications. Herein, a cellulose aerogel modified by thiosemicarbamide (CAT) was fabricated for reducing and adsorbing silver ions from low concentration wastewater. The characterization results concluded that CAT owned a three-dimensional spongy structure with many circular microspheres and a better specific surface area (19.37 m2 g−1), as well as the functional groups of ─C═N+─H and ─(C═S)─N. The static batch adsorption experiments demonstrated that CAT could reached the maximum removal percentage of 94.94% and adsorption capacity of 42.12 mg g−1 under the initial concentration of Ag(I) was 15 mg L−1 and the pH value was 7. Meanwhile, the adsorption of Ag(I) on CAT was second-order reaction, and the Langmuir model could better fit the adsorption process. In addition, CAT exhibited wide pH values (1–9) adaptability and excellent adsorption performance for silver through electrostatic interaction, chelation, and reduction. This study probably provides a new method as well as important experimental data and theoretical reference for the removal of silver ions and other metals. |
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| Keywords: | adsorption applications cellulose aerogel reduction silver ions |
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