摘要
重金属铬属环境优先污染物,并具有致癌性,其有效治理一直是环保工作者努力的方向。研究了香菜对六价铬的吸附效果及其影响因素,结果表明:影响香菜吸附六价铬的主要因素及顺序为pH、六价铬初始质量浓度、香菜吸附剂用量;室温下,在六价铬初始质量浓度为15mg/L,pH=3的100mL模拟废水中加入粒径为167μm(90目)的香菜吸附剂1.0g,在250r/min的速率下搅拌吸附60min,香菜对六价铬的去除率达98.2%,废水中残余六价铬质量浓度仅为0.27mg/L,低于GB8978—1996《国家污水综合排放标准》中第一类污染物最高允许排放质量浓度;香菜对六价铬的吸附过程符合弗罗因德利希等温吸附方程,方程中的n大于1,说明该吸附为优惠吸附。
Chromium is an environmental priority pollutant, it is carcinogenic, and its effective management has been the direction of environmental workers' efforts. In this paper, the adsorption effect of cilantro on Cr(Ⅵ)and its influencing factors were studied in order to develop an economical and effective biomass absorbent for removing chromium. The results showed that the main factors influencing the absorption of Cr(Ⅵ) were the pH value of the wastewater, the initial concentration of chromium, and the dosage of cilantro. At room temperature, 1.0 g cilantro with particle size of 167 μm (90 mesh) was added to 100 mL simulated wastewater with pH of three and initial chromium concentration of 15 mg/L, and adsorbed at a stirring rate of 250 r/min. 60 minutes later, the removal rate of Cr(Ⅵ) was 98.2%, and the residual concentration of Cr(Ⅵ) in wastewater was only 0.27 mg/L, which was lower than the maximum allowable emission concentration of the first type of pollutant in the Integrated Wastewater Discharge Standard (GB 8978-1996). The adsorption process of cilantro for Cr(Ⅵ) conforms to the Freundlich isothermal adsorption equation, and n was greater than 1, indicating that the adsorption of Cr(Ⅵ) on cilantro was easy to occur, and it was preferential adsorption.
作者
崔泉涛
胡巧开
余中山
CUI Quantao;HU Qiaokai;YU Zhongshan
出处
《上海化工》
CAS
2019年第3期19-23,共5页
Shanghai Chemical Industry
关键词
香菜
六价铬
吸附
去除率
Cilantro
Cr(Ⅵ)
Adsorption
Removal rate
