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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.

» Author: Jerosha Ifthikar, Xiang Jiao, Audrey Ngambia, Ting Wang, Aimal Khan, Ali Jawad, Qiang Xue, Lei Liu, Zhuqi Chen

» Reference: Bioresource Technology, Volume 262

» Publication Date: 01/08/2018

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