Journal
BIORESOURCE TECHNOLOGY
Volume 322, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.124539
Keywords
Alkali lignin; Biochar property; Pb(II) adsorption; Sorption behavior; Mechanisms
Funding
- China postdoctoral science foundation [2018M640750]
- Natural science foundation of Hunan province, China [2019JJ50224]
- Natural Science Foundation of Hunan [2018JJ3301]
- Bureau Science and Technology of Changsha [kq1901034]
- Key scientific research project of Education Department of Hunan Province [20A245]
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The study found that biochar derived from alkali lignin has superior adsorption performance, fast absorption rate, and high maximum adsorption capacity, making it suitable for pollution remediation.
Developing a cost-effective and high-efficiency biochar is critical in various environmental applications. Lignin-based materials are natural and abundant adsorbents to heavy metals benefited from their special polyphenol structure and physicochemical properties. In this study, adsorption capacities to Pb(II) by alkali lignin (AL) and its biochar derivative (ALB) were comparatively discussed, and the latter exhibited superior adsorption performance, with a maximum adsorption capacity almost twice that of the former, and a much faster absorption rate. The q(m) value of ALB was significantly superior to that of other reported biochar materials. Pb(II) was mainly adsorbed into ALB in three forms: mineral precipitation, ion exchange, and surface complexation, with complexation and mineral precipitation being the dominant mechanisms of adsorption. This study demonstrates that alkali-lignin derived biochar is a promising material for the remediation of polluted by Pb(II).
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