RESEARCH PROGRESS ON ADSORPTION OF HEAVY METALS BY SEWAGE SLUDGE-BASED BIOCHAR IN WATER
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摘要: 重金属带来的环境风险日益严峻,利用污泥生物炭去除水中重金属污染方面的研究得到了广泛关注。结合当前国内外研究现状,归纳了不同条件下制备的污泥生物炭对水中重金属,如Cd、Pb、Cr、As等的吸附机理,污泥生物炭对大多数重金属的吸附满足物理吸附和化学吸附的多重作用,可通过增加生物炭表面有效基团及有效吸附位点提升吸附性能。同时,总结了影响吸附效率的各种因素,探究了污泥生物炭的再生问题,并对今后污泥生物炭去除水中重金属的研究方向做出了展望。Abstract: The environmental risks caused by heavy metals have become increasingly serious, and the research on adsorption of heavy metals by sewage sludge-based biochar has attracted more and more attention. Based on current global research status, the adsorption mechanism of sewage sludge-based biochar prepared under different conditions for different heavy metals such as cadmium (Cd), lead (Pb), chromium (Cr), and arsenic (As) were concluded. The adsorption of sludge biochar on most heavy metals in water met the multiple effects of physical and chemical adsorption, and its adsorption performance can be effectively enhanced by increasing effective surface groups and adsorption sites. At the same time, various factors affecting adsorption efficiency were summarized in detail in paper, and the regeneration of sewage sludge-based biochar was explored, and the future research directions of sludge biochar for removing heavy metals in water were prospected.
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Key words:
- sewage sludge-based biochar /
- heavy metals /
- adsorption /
- desorption
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