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Review

Research Progress on Adsorption of Arsenic from Water by Modified Biochar and Its Mechanism: A Review

by 1,2,*,†, 1,2,†, 1,2, 1,2, 1,2 and 1,2
1
Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, School of Water and Environment, Chang’an University, Xi’an 710054, China
2
Department of Environmental Engineering, School of Water and Environment, Chang’an University, Xi’an 710054, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Alexandre T. Paulino
Water 2022, 14(11), 1691; https://doi.org/10.3390/w14111691
Received: 22 April 2022 / Revised: 18 May 2022 / Accepted: 22 May 2022 / Published: 25 May 2022
Arsenic (As) is a non-metallic element, which is widely distributed in nature. Due to its toxicity, arsenic is seriously harmful to human health and the environment. Therefore, it is particularly important to effectively remove arsenic from water. Biochar is a carbon-rich adsorption material with advantages such as large specific surface area, high porosity, and abundant functional groups, but the original biochar has limitations in application, such as limited adsorption capacity and adsorption range. The modified biochar materials have largely enhanced the adsorption capacity of As in water due to their improved physicochemical properties. In this review, the changes in the physicochemical properties of biochar before and after modification were compared by SEM, XRD, XPS, FT-IR, TG, and other characterization techniques. Through the analysis, it was found that the adsorbent dosage and pH are the major factors that influence the As adsorption capacity of the modified biochar. The adsorption process of As by biochar is endothermic, and increasing the reaction temperature is conducive to the progress of adsorption. Results showed that the main mechanisms include complexation, electrostatic interaction, and precipitation for the As removal by the modified biochar. Research in the field of biochar is progressing rapidly, with numerous achievements and new types of biochar-based materials prepared with super-strong adsorption capacity for As. There is still much space for in-depth research in this field. Therefore, the future research interests and applications are put forward in this review. View Full-Text
Keywords: biochar; arsenic; adsorption; mechanism; modification; water treatment biochar; arsenic; adsorption; mechanism; modification; water treatment
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MDPI and ACS Style

Sun, Y.; Yu, F.; Han, C.; Houda, C.; Hao, M.; Wang, Q. Research Progress on Adsorption of Arsenic from Water by Modified Biochar and Its Mechanism: A Review. Water 2022, 14, 1691. https://doi.org/10.3390/w14111691

AMA Style

Sun Y, Yu F, Han C, Houda C, Hao M, Wang Q. Research Progress on Adsorption of Arsenic from Water by Modified Biochar and Its Mechanism: A Review. Water. 2022; 14(11):1691. https://doi.org/10.3390/w14111691

Chicago/Turabian Style

Sun, Yongchang, Fangxin Yu, Caohui Han, Chouarfa Houda, Mingge Hao, and Qiongyao Wang. 2022. "Research Progress on Adsorption of Arsenic from Water by Modified Biochar and Its Mechanism: A Review" Water 14, no. 11: 1691. https://doi.org/10.3390/w14111691

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