改性海泡石处理镀镍车间漂洗废水的实验研究

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• 英文论文题名：Research on treatment of rinsing wastewater of nickel plating by magnetic modified sepiolite
• 论文作者：李琛
• 英文论文作者：LI Chen ; School of Chemistry and Environmental Science ; Shaanxi Sci-tech University
• 年：2016
• 作者机构：陕西理工大学化学与环境科学学院;
• 论文关键词：海泡石 ; 磁改性 ; 含镍离子废水
• 英文论文关键词：sepiolite ; magnetic modified sepiolite ; nickel ion containing wastewater
• 会议召开时间：2016-12-01
• 会议录名称：第六届重金属污染防治及风险评价研讨会暨重金属污染防治专业委员会2016年学术年会论文集
• 语种：中文
• 分类号：X703
• 学会代码：HJKP
• 会议名称：第六届重金属污染防治及风险评价研讨会暨重金属污染防治专业委员会2016年学术年会
• 会议地点：中国福建厦门
• 主办单位：中国环境科学学会
• 学会名称：中国环境科学学会
• 页数：6
• 文件大小：1101k
• 原文格式：D
• 会议级别：全国

摘要

以天然海泡石为原料,FeSO_4·4H_2O和FeCl_3·6H_2O为改性剂,制备了磁改性海泡石并用于处理含Ni~(2+)废水。考察了吸附时间、反应温度、pH和Ni~(2+)初始质量浓度对磁改性海泡石对Ni~(2+)吸附量的影响。结果显示,磁改性海泡石对Ni~(2+)的吸附量随吸附时间,温度,p H与Ni~(2+)初始质量浓度的增加而提高。吸附与二级动力学方程(K_2=0.8783,qe=3.17)和Langmuir等温吸附模型(qmax=4.82,KL=0.0202)拟合较好。对Ni~(2+)质量浓度为50 mg/L的废水,在25°C,p H为5,吸附剂投加量为0.5 g的条件下,磁改性海泡石对Ni~(2+)的吸附量为2.95 mg/g。通过正交实验优选出适用于Ni~(2+)质量浓度为68.48 mg/L的某镀镍车间漂洗废水的最佳实验条件为:温度为65℃,p H为4.2,吸附剂投加量为1.5 g,时间为1.5 h。Ni~(2+)去除率为99.65%,出水Ni~(2+)质量浓度为0.24 mg/L,远低于GB 21900–2008规定的排放限值。
The magnetic modified sepiolite was prepared using the nature sepiolite as raw material, FeSO_4·4H_2O and FeCl_3·6H_2O as modifier and used to treat wastewater containing Ni~(2+).The effects of adsorption time, reaction temperature, p H and initial mass concentration of Ni~(2+)on the adsorption amount of Ni~(2+) by magnetic modified sepiolite were investigated. It was found that the adsorption amount of Ni~(2+) on the magnetic modified sepiolite increases with increasing of adsorption time, temperature,p H or initial mass concentration of Ni~(2+). The adsorption behavior can be well described with a second order rate equation(K_2 = 0.8783, qe = 3.17) and Langmuir isotherm(qmax= 4.82, KL = 0.0202).The adsorption amount of Ni~(2+) on the magnetic modified sepiolite in wastewater containing 50 mg/L Ni~(2+) is 2.95 mg/g under the conditions as follows: temperature 25 °C, pH 5, dosage of adsorbent 0.5 g. An optimized process for treating rinse wastewater containing 68.48 mg/L Ni~(2+) from a nickel plating workshop was obtained through orthogonal experiments as follows: temperature 65 °C, pH 4.2,dosage of adsorbent 1.5 g, time 1.5 h. The remove rate of Ni~(2+) is 99.65%. The effluent mass concentration of Ni~(2+) is 0.24 mg/L, which is much lower than that in the standard of GB 21900–2008.

引文

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