Preparation of a novel sludge-derived biochar by K2FeO4 conditioning to enhance the removal of Pb2+
- Wang, J.
- Wang, T.
- Zhu, Q.
- Zhang, S.
- Shi, Q.
- Chovelon, J. M.
- Wang, Hongtao
DOIAbstract
International audienceIn this study, three types of sludge-derived biochars (BC1, BC2 and BC3) were prepared by 1) original sludge, 2) sludge after K2FeO4 conditioning, and 3) sludge after acidification + K2FeO4 conditioning. The results show that the biochar prepared from the conditioned sludge has additional functional groups, and its Pb2+ removal effect is greatly enhanced. The concentration of Pb2+ in the effluent can be reduced to <0.06 μg/L. The original sludge-derived biochar can only remove at most 58.02% of Pb2+. The maximum adsorption capacity of BC3 is six times greater than that of BC1. The ion exchange effect of Ca2+ and Mg2+ on the biochar surface and the complexation of free -OH or -COOH functional groups lead to an excellent...
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