香菜对六价铬的吸附研究
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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, 1.0g cilantro with particle size of 167μm(90 mesh) was added to 100mL simulated wastewater with pH of three and initial chromium concentration of 15mg/L, and adsorbed at a stirring rate of 250r/min. 60 minutes later, the removal rate of Cr(Ⅵ) was 98.2%, and the residual concentration of Cr(Ⅵ) in wastewater was only 0.27mg/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.
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, 1.0g cilantro with particle size of 167μm(90 mesh) was added to 100mL simulated wastewater with pH of three and initial chromium concentration of 15mg/L, and adsorbed at a stirring rate of 250r/min. 60 minutes later, the removal rate of Cr(Ⅵ) was 98.2%, and the residual concentration of Cr(Ⅵ) in wastewater was only 0.27mg/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.
引文
[1]邹照华,何素芬,韩彩芸,等.重金属废水处理技术研究进展[J].水处理技术,2010,36(6):17-21.
[2]陈丽琼,霍巨垣,王欣,等.六价铬测定方法研究进展[J].理化检验:化学分册,2015,51(8):1208-1212.
[3]王谦,李延,孙平,等.含铬废水处理技术及研究进展[J].环境科学与技术,2013(S2):150-156.
[4]梁帅,颜冬云,徐绍辉.重金属废水的生物治理技术研究进展[J].环境科学与技术,2009,32(11):108-114.
[5]刘智峰,李旭.改性花生壳吸附废水中Cr(Ⅵ)条件的优选试验[J].安徽农业科学,2010,38(29):16 498-16 500.
[6]蒋新龙,蒋益花.改性竹笋壳生物吸附剂的制备及其对Cr(Ⅵ)的吸附工艺研究[J].浙江树人大学学报,2012,12(1):16-24.
[7]张帆,李菁,谭建华.吸附法处理重金属废水的研究进展[J].化工进展,2013,32(11):2749-2756.
[8]黄金阳,王伟艺.蔗渣改性吸附剂对Cr(Ⅵ)的吸附研究[J].中国资源综合利用,2010,28(5):26-28.
[9]李萍,宫磊.生物吸附剂---落叶对印染废水的吸附处理研究[J].青岛科技大学学报(自然科学版),2012,33(1):62-67.
[10]单达聪,耿爱莲.L9(34)正交试验数据Excel自动分析模板的建立和应用[J].饲料工业,2011,32(1):24-27.
[11]蒋成义,胡婉玉,王安杏.生物秸秆吸附材料研究进展[J].应用化工,2015,44(1):165-167,171.
[12]中华人民共和国国家环境保护局.中华人民共和国国家标准污水综合排放标准:GB 8978-1996[S].北京:中国标准出版社.
[13]胡巧开,揭武,邓真丽.香蕉皮吸附活性艳橙的研究[J].上海化工,2013,38(1):6-8.
[14]杜竞杉.Langmuir等温式应用于溶液的等温吸附实验[J].实验室研究与探索,2014,33(10):207-210.
[15]代立波,周从章,原思国.弱碱性离子交换纤维对六价铬吸附性能的研究[J].高校化学工程学报,2012,26(4):674-678.
[2]陈丽琼,霍巨垣,王欣,等.六价铬测定方法研究进展[J].理化检验:化学分册,2015,51(8):1208-1212.
[3]王谦,李延,孙平,等.含铬废水处理技术及研究进展[J].环境科学与技术,2013(S2):150-156.
[4]梁帅,颜冬云,徐绍辉.重金属废水的生物治理技术研究进展[J].环境科学与技术,2009,32(11):108-114.
[5]刘智峰,李旭.改性花生壳吸附废水中Cr(Ⅵ)条件的优选试验[J].安徽农业科学,2010,38(29):16 498-16 500.
[6]蒋新龙,蒋益花.改性竹笋壳生物吸附剂的制备及其对Cr(Ⅵ)的吸附工艺研究[J].浙江树人大学学报,2012,12(1):16-24.
[7]张帆,李菁,谭建华.吸附法处理重金属废水的研究进展[J].化工进展,2013,32(11):2749-2756.
[8]黄金阳,王伟艺.蔗渣改性吸附剂对Cr(Ⅵ)的吸附研究[J].中国资源综合利用,2010,28(5):26-28.
[9]李萍,宫磊.生物吸附剂---落叶对印染废水的吸附处理研究[J].青岛科技大学学报(自然科学版),2012,33(1):62-67.
[10]单达聪,耿爱莲.L9(34)正交试验数据Excel自动分析模板的建立和应用[J].饲料工业,2011,32(1):24-27.
[11]蒋成义,胡婉玉,王安杏.生物秸秆吸附材料研究进展[J].应用化工,2015,44(1):165-167,171.
[12]中华人民共和国国家环境保护局.中华人民共和国国家标准污水综合排放标准:GB 8978-1996[S].北京:中国标准出版社.
[13]胡巧开,揭武,邓真丽.香蕉皮吸附活性艳橙的研究[J].上海化工,2013,38(1):6-8.
[14]杜竞杉.Langmuir等温式应用于溶液的等温吸附实验[J].实验室研究与探索,2014,33(10):207-210.
[15]代立波,周从章,原思国.弱碱性离子交换纤维对六价铬吸附性能的研究[J].高校化学工程学报,2012,26(4):674-678.