期刊
BIORESOURCE TECHNOLOGY
卷 262, 期 -, 页码 22-31出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.04.053
关键词
Sewage sludge biochar; Carboxymethyl chitosan; Adsorption; Mercury; Lead
资金
- National Natural Science Foundation of China [21671072]
- Chutian Scholar Foundation from Hubei province
In this paper, sewage sludge, a solid waste from wastewater treatment plant, which eagerly requires proper treatment was reused as solid support in the form of sewage sludge biochar, then modified with carboxymethyl chitosan to form a bio-adsorbent. Further, carboxymethyl chitosan coating on sewage sludge biochar improved carboxymethyl chitosan's stability in water. The prepared bio-adsorbent revealed a shorter equilibrium time (< 60 min) for Pb(II) adsorption and a superior capacity of 594.17 mg g(-1) for Hg(II) adsorption, which are so far the best recorded performance achieved for chitosan based adsorbents. Additionally, the adsorbent was highly selective for heavy metal ions and it also presented a good stability and reusability for industrial applications. These outcomes demonstrate waste valorization through a green, facile and one-pot approach that turns the solid waste of sewage sludge into biochar adsorbent with propitious applications in the elimination of heavy metal ions from wastewater.
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