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改性沸石及添加CaCl2和MgCl2 对重金属离子Pb2+吸附特性的影响

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刘崇敏, 黄益宗, 于方明, 伍文, 钟敏, 孙晓铧, 徐峰. 改性沸石及添加CaCl2和MgCl2 对重金属离子Pb2+吸附特性的影响[J]. 环境化学, 2013, 32(5): 803-809. doi: 10.7524/j.issn.0254-6108.2013.05.012
引用本文: 刘崇敏, 黄益宗, 于方明, 伍文, 钟敏, 孙晓铧, 徐峰. 改性沸石及添加CaCl2和MgCl2 对重金属离子Pb2+吸附特性的影响[J]. 环境化学, 2013, 32(5): 803-809. doi: 10.7524/j.issn.0254-6108.2013.05.012
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LIU Chongmin, HUANG Yizong, YU Fangming, WU Wen, ZHONG Min, SUN Xiaohua, XU Feng. Adsorption of aqueous Pb(Ⅱ) by natural and modified zeolite and the effect of CaCl2 and MgCl2[J]. Environmental Chemistry, 2013, 32(5): 803-809. doi: 10.7524/j.issn.0254-6108.2013.05.012
Citation: LIU Chongmin, HUANG Yizong, YU Fangming, WU Wen, ZHONG Min, SUN Xiaohua, XU Feng. Adsorption of aqueous Pb(Ⅱ) by natural and modified zeolite and the effect of CaCl2 and MgCl2[J]. Environmental Chemistry, 2013, 32(5): 803-809. doi: 10.7524/j.issn.0254-6108.2013.05.012
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改性沸石及添加CaCl2和MgCl2 对重金属离子Pb2+吸附特性的影响

  • 1.

    广西师范大学环境与资源学院, 桂林, 541004;

  • 2.

    中国科学院生态环境研究中心, 北京, 100085

  • 基金项目:

    国家重金属污染治理专项"广西环江县大环江流域土壤重金属污染治理工程项目"

    国家水体污染控制与治理科技重大专项(2009ZX07212-001-05) 资助.

Adsorption of aqueous Pb(Ⅱ) by natural and modified zeolite and the effect of CaCl2 and MgCl2

  • 1.

    College of Environment and Resources, Guangxi Nomal University, Guilin, 541004, China;

  • 2.

    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China

  • Fund Project:

  • 摘要: 研究天然沸石和改性沸石对Pb2+吸附的性能,探讨不同因素对沸石吸附Pb2+的影响.结果表明,天然沸石经过3种不同方法改性后均可促进其对Pb2+的吸附.氢氧化钠改性沸石吸附Pb2+效果最好,其次是硝酸钾改性沸石,氯化铵改性沸石吸附Pb2+效果稍差一些.不同Pb2+初始浓度、沸石使用量、pH和温度均对天然沸石和改性沸石吸附Pb2+有影响.天然沸石和改性沸石对Pb2+的等温吸附可用Langmuir方程和Freundlich方程来拟合,其中Langmuir方程的拟合效果较好,相关系数在0.9203—0.9840之间.CaCl2和MgCl2可影响天然沸石和改性沸石对Pb2+的吸附.当CaCl2和MgCl2的浓度均为10 mmol·L-1时,天然沸石吸附Pb2+量分别比对照处理提高66.6%和54.5%.添加2—10 mmol·L-1 CaCl2和MgCl2导致氯化铵改性沸石吸附Pb2+分别比对照处理提高16.4%—18.8%和16.8%—19.9%.研究结果表明,采用沸石去除废水中的Pb元素时必须考虑不同因素的影响,以达到重金属去除效率的最大化.
    Abstract: Adsorption of Pb2+ from aqueous solutions by natural and modified zeolite was investigated. The results showed that three different modified zeolites could promote the Pb2+ adsorption, compared with natural zeolite. The best of Pb2+ adsorption was NaOH modified zeolite, and followed by KNO3 modified zeolite. The adsorption of Pb2+ by NH4Cl modified zeolite was lower than natural zeolite. The adsorption of Pb2+ was influenced by the initial Pb2+ concentration, the dosage of zeolite, the pH of solution and temperature. Adsorption of Pb2+ by natural zeolite and modified zeolite could be well fitted by Langmuir isotherm equation and Freundlich equation. The equilibrium process was better described by Langmuir isotherm equation, and the correlation coefficient was 0.9203—0.9840. The adsorption of Pb2+ could be affected by the addition of CaCl2 and MgCl2. When added 10 mmol·L-1 CaCl2 and MgCl2 respectively, the adsorption of Pb2+ by natural zeolite increased by 66.6% and 54.5%, compared with the control treatment. The adsorption of Pb by NH4Cl modified zeolite increased 16.4%—18.8% and 16.8%—19.9% respectively, at the CaCl2 and MgCl2 concentrations of 2—10 mmol·L-1. The result suggested that different factors must be considered in order to achieve the maximum efficiency of heavy metal removal from wastewater by natural and modified zeolite.
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    [2] Milan K, Aleksandra D, Zivko S. Removal of lead from aqueous solutions by using the natural and Fe(Ⅲ)-modified zeolite [J]. Applied Surface Science, 2012, 258: 3667-3673
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  • 收稿日期:  2012-08-02

改性沸石及添加CaCl2和MgCl2 对重金属离子Pb2+吸附特性的影响

  • 1.  广西师范大学环境与资源学院, 桂林, 541004;
  • 2.  中国科学院生态环境研究中心, 北京, 100085
  • 收稿日期:  2012-08-02
基金项目:

国家重金属污染治理专项"广西环江县大环江流域土壤重金属污染治理工程项目"

国家水体污染控制与治理科技重大专项(2009ZX07212-001-05) 资助.

摘要: 研究天然沸石和改性沸石对Pb2+吸附的性能,探讨不同因素对沸石吸附Pb2+的影响.结果表明,天然沸石经过3种不同方法改性后均可促进其对Pb2+的吸附.氢氧化钠改性沸石吸附Pb2+效果最好,其次是硝酸钾改性沸石,氯化铵改性沸石吸附Pb2+效果稍差一些.不同Pb2+初始浓度、沸石使用量、pH和温度均对天然沸石和改性沸石吸附Pb2+有影响.天然沸石和改性沸石对Pb2+的等温吸附可用Langmuir方程和Freundlich方程来拟合,其中Langmuir方程的拟合效果较好,相关系数在0.9203—0.9840之间.CaCl2和MgCl2可影响天然沸石和改性沸石对Pb2+的吸附.当CaCl2和MgCl2的浓度均为10 mmol·L-1时,天然沸石吸附Pb2+量分别比对照处理提高66.6%和54.5%.添加2—10 mmol·L-1 CaCl2和MgCl2导致氯化铵改性沸石吸附Pb2+分别比对照处理提高16.4%—18.8%和16.8%—19.9%.研究结果表明,采用沸石去除废水中的Pb元素时必须考虑不同因素的影响,以达到重金属去除效率的最大化.

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