Journal ArticleDOI
A review of biochar as a low-cost adsorbent for aqueous heavy metal removal
Mandu Inyang,Bin Gao,Ying Yao,Yingwen Xue,Andrew R. Zimmerman,Ahmed Mosa,Pratap Pullammanappallil,Yong Sik Ok,Xinde Cao +8 more
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TLDR
In this article, a review incorporating existing literature to understand the overall sorption behavior of heavy metals on biochar adsorbents is presented, and mathematical models are used to evaluate the efficiency of biochar at removing heavy metals.Abstract:
As a low-cost adsorbent, biochar can be used as a low-cost adsorbent for wastewater treatment, particularly with respect to treating heavy metals in wastewater. A number of studies have demonstrated effective removal of heavy metals from aqueous solutions by biochar and, in some cases, proven the superiority of biochars to activated carbons. Among several factors affecting the sorption ability of biochars, feedstock materials play a significant role. This review incorporates existing literature to understand the overall sorption behavior of heavy metals on biochar adsorbents. Depending on the biochar type, heavy metal can be removed by different mechanisms such as complexation, physical sorption, precipitation and electrostatic interactions. Mathematical sorption models can be used to understand the efficiency of biochar at removing heavy metals, and promote the application of biochar technology in water treatment.read more
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Pharmaceuticals of Emerging Concern in Aquatic Systems: Chemistry, Occurrence, Effects, and Removal Methods.
TL;DR: Adsorption technologies are a low-cost alternative, easily used in developing countries where there is a dearth of advanced technologies, skilled personnel, and available capital, and adsorption appears to be the most broadly feasible pharmaceutical removal method.
Journal ArticleDOI
Mechanisms of metal sorption by biochars: Biochar characteristics and modifications
Hong-Bo Li,Xiaoling Dong,Evandro B. da Silva,Letuzia M. de Oliveira,Yanshan Chen,Lena Q. Ma,Lena Q. Ma +6 more
TL;DR: This review summarizes the characteristics of biochar (e.g., surface area, porosity, pH, surface charge, functional groups, and mineral components) and main mechanisms governing sorption of As, Cr, Cd, Pb, and Hg by biochar and includes competitive sorption mechanisms of co-existing metals.
Journal ArticleDOI
Preparation, modification and environmental application of biochar: A review
Jianlong Wang,Shizong Wang +1 more
TL;DR: In this paper, a review of the preparation, characterization, modification, and especially environmental application of biochar, based on more than 200 papers published in recent 10 year, to provide an overview of Biochar with a particular on its environmental application.
Journal ArticleDOI
Catalytic removal of aqueous contaminants on N-doped graphitic biochars: inherent roles of adsorption and nonradical mechanisms.
TL;DR: This study not only provides robust and cheap carbonaceous materials for environmental remediation but also enables the first insight into the graphitic biochar-based nonradical catalysis.
Journal ArticleDOI
Surface functional groups of carbon-based adsorbents and their roles in the removal of heavy metals from aqueous solutions: A critical review.
Xiaodong Yang,Yongshan Wan,Yulin Zheng,Feng He,Zebin Yu,Jun Huang,Hailong Wang,Yong Sik Ok,Yinshan Jiang,Bin Gao +9 more
TL;DR: This work provides a comprehensive review of recent research on various carbon adsorbents in terms of their surface functional groups and the associated removal behaviors and performances to heavy metals in aqueous solutions.
References
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