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论文类型：期刊论文

发表时间：2018-06-01

发表刊物：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH

收录刊物：PubMed、SCIE

卷号：25

期号：16

页面范围：15754-15764

ISSN号：0944-1344

关键字：Vinegar residue; Biochar; Cadmium pollution; Remediation; Water; Soil

摘要：This study investigated a new biochar produced from vinegar residue that could be used to remediate cadmium (Cd)-contaminated water and soil. Aqueous solution adsorption and soil incubation experiments were performed to investigate whether a biochar prepared at 700 degrees C from vinegar residue could efficiently adsorb and/or stabilize Cd in water and soil. In the aqueous solution adsorption experiment, the Cd adsorption process was best fitted by the pseudo-second-order kinetic and Freundlich isotherm models. If the optimum parameters were used, i.e., pH 5 or higher, a biochar dosage of 12 g L-1, a 10 mg L-1 Cd initial concentration, and 15-min equilibrium time, at 25 degrees C, then Cd removal could reach about 100%. The soil incubation experiment evaluated the biochar effects at four different application rates (1, 2, 5, and 10% w/w) and three Cd contamination rates (0.5, 1, and 2.5 mg kg(-1)) on soil properties and Cd fractionation. Soil pH and organic matter increased after adding biochar, especially at the 10% application rate. At Cd pollution levels of 1.0 or 2.5 mg kg(-1), a 10% biochar application rate was most effective. At 0.5 mg Cd kg(-1) soil, a 5% biochar application rate was most efficient at transforming the acid extractable and easily reducible Cd fractions to oxidizable and residual Cd. The results from this study demonstrated that biochar made from vinegar residue could be a new and promising alternative biomass-derived material for Cd remediation in water and soil.