Journal
BIORESOURCE TECHNOLOGY
Volume 148, Issue -, Pages 574-585Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.08.124
Keywords
Agricultural waste based biosorbents; Biosorption capacity; Heavy metals; Removal efficiency
Funding
- Research Theme of Sustainable Water - Wastewater Treatment and Reuse technologies, Centre for Technology in Water and Wastewater (CTWW), School of Civil and Environmental Engineering, University of Technology, Sydney (UTS)
- Australian Scholarships for Development in Vietnam (ASDiV)
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This critical review discusses the potential use of agricultural waste based biosorbents (AWBs) for sequestering heavy metals in terms of their adsorption capacities, binding mechanisms, operating factors and pretreatment methods. The literature survey indicates that AWBs have shown equal or even greater adsorption capacities compared to conventional adsorbents. Thanks to modern molecular biotechnologies, the roles of functional groups in biosorption process are better understood. Of process factors, pH appears to be the most influential. In most cases, chemical pretreatments bring about an obvious improvement in metal uptake capacity. However, there are still several gaps, which require further investigation, such as (i) searching for novel, multi-function AWBs, (ii) developing cost-effective modification methods and (iii) assessing AWBs under multi-metal and real wastewater systems. Once these challenges are settled, the replacement of traditional adsorbents by AWBs in decontaminating heavy metals from wastewater can be expected in the future. (C) 2013 Elsevier Ltd. All rights reserved.
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