Preparing a heavy-metal adsorbent based on alginate-like extracellular polymers from conventional activated sludge via polyethyleneimine grafting

文献类型： 外文期刊

第一作者： Shi, Chen

作者： Shi, Chen;Zeng, Run-Gen;Yuan, Shi-Chao;Zhang, Lin;Wang, Xiang-Yang;Hao, Li-Ting;Hao, Xiao-Di;Zhang, Nan;Wu, Yuan-Yuan;Shi, Chen;Hao, Xiao-Di

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关键词： Adsorbent; Alginate-like extracellular polymers; Polyethyleneimine; Conventional activated sludge

期刊名称：SUSTAINABLE CHEMISTRY AND PHARMACY （ 影响因子：6.0； 五年影响因子：5.6 ）

ISSN：

年卷期： 2024 年 38 卷

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收录情况： SCI

摘要： This paper describes the preparation of a novel heavy-metal adsorbent based on alginate -like extracellular polymers extracted from excess activated sludge. Typical extracellular polymeric substances obtained from activated sludge can adsorb heavy metals; however, their adsorption capacities are unsatisfactory. Although a gel -like recovery system can be formed, it still cannot be easily separated. By grafting polyethyleneimine, the adsorption capacities and recovery efficiencies of alginate -like extracellular polymers can be increased simultaneously. Fourier -transform infrared analysis of the changes in the functional groups of the modified samples showed a marked increase at 1238, 2923, and 1650 cm-1, confirming successful grafting. Scanning electron microscopy and related analyses revealed the formation of a complex three-dimensional network and an increment in the specific surface area after grafting, which provided more active binding sites for Cu(II) adsorption. The energy dispersive spectrum and X-ray photoelectron spectroscopy profile showed that the hydroxy, amino, and carboxyl groups in the adsorbent formed complexes with Cu(II). The maximum adsorption capacity of the ALEC1-PEI adsorbent prepared in this study was 98.01 mg/g according to the Langmuir model, and the adsorption of Cu(II) proceeded most efficiently at pH 5. Furthermore, the recycled adsorbent shows considerable potential for commercial application in wastewater treatment.

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