A review of biochar as a low-cost adsorbent for aqueous heavy metal removal. Issue 4 (16th February 2016)

• Record Type: Journal Article
• Authors: Inyang, Mandu I.; Gao, Bin; Yao, Ying; Xue, Yingwen; Zimmerman, Andrew; Mosa, Ahmed; Pullammanappallil, Pratap; Ok, Yong Sik; Cao, Xinde
• Is Part Of: Critical reviews in environmental science and technology. Volume 46:Issue 4(2016)
• Page Start: 406
• Page End: 433
• Publication Date: 2016-02-16
• Subjects: Black carbon -- charcoal -- trace element -- wastewater -- pyrogenic carbon; Pollution -- Environmental aspects -- Periodicals; Environmental protection -- Periodicals; Environmental engineering -- Periodicals; Environmental health -- Periodicals; Nature -- Effect of human beings on -- Periodicals; 363.73
• DOI: 10.1080/10643389.2015.1096880
• Languages: English
• ISSNs: 1064-3389

Abstract

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.