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碳酸根型镁铝水滑石对铬酸根和磷酸根离子的吸附性能

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林巧莺, 陈岳民. 碳酸根型镁铝水滑石对铬酸根和磷酸根离子的吸附性能[J]. 环境工程学报, 2015, 9(10): 4687-4696. doi: 10.12030/j.cjee.20151012
引用本文: 林巧莺, 陈岳民. 碳酸根型镁铝水滑石对铬酸根和磷酸根离子的吸附性能[J]. 环境工程学报, 2015, 9(10): 4687-4696. doi: 10.12030/j.cjee.20151012
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Lin Qiaoying, Chen Yuehmin. Adsorption of chromate and phosphate from aqueous solution by Mg/Al layered double hydroxides intercalated by carbonate[J]. Chinese Journal of Environmental Engineering, 2015, 9(10): 4687-4696. doi: 10.12030/j.cjee.20151012
Citation: Lin Qiaoying, Chen Yuehmin. Adsorption of chromate and phosphate from aqueous solution by Mg/Al layered double hydroxides intercalated by carbonate[J]. Chinese Journal of Environmental Engineering, 2015, 9(10): 4687-4696. doi: 10.12030/j.cjee.20151012
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碳酸根型镁铝水滑石对铬酸根和磷酸根离子的吸附性能

  • 1.

    泉州师范学院资源与环境科学学院, 泉州 362000

  • 2.

    福建师范大学地理科学学院, 福州 350007

  • 基金项目:

    国家自然科学基金资助项目(41401555)

  • 中图分类号: X131.2

Adsorption of chromate and phosphate from aqueous solution by Mg/Al layered double hydroxides intercalated by carbonate

  • 1.

    School of Resources and Environmental Science, Quanzhou Normal University, Quanzhou 362000, China

  • 2.

    School of Geography, Fujian Normal University, Fuzhou 350007, China

  • Fund Project:

  • 摘要: 为研究水滑石类材料对水体中铬酸根和磷酸根离子的同时吸附去除性能,采用共沉淀法合成碳酸根型镁铝水滑石(Mg-Al-CO3 LDHs),利用傅立叶转换红外光谱、X射线晶体衍射、表面积、X光吸收近边结构等手段对合成材料进行表征,并研究Mg-Al-CO3 LDHs在不同初始浓度、pH、吸附时间、阴离子干扰条件下同时去除铬酸根和磷酸根离子的性能。结果表明,Mg-Al-CO3 LDHs对铬酸根和磷酸根离子最大吸附量分别为0.042 mmol/g和0.146 mmol/g。吸附动力学实验数据的拟合结果以Elovich为最佳。竞争实验表明,溶液中含有少量磷酸根离子即可抑制铬酸根离子的吸附,但铬酸根离子对磷酸根离子的吸附影响不大。X光吸收近边结构结果表明,铬与构造中心的铝产生键结而吸附。
    Abstract: Mg/Al layered double hydroxides intercalated by carbonate(Mg-Al-CO3 LDHs) were prepared by co-precipitation method for investigating the competitive adsorption of chromate and phosphate in aqueous solutions.Their characteristics were examined by Fourier transform infrared spectrometer(FTIR),X-ray diffraction(XRD),surface area(BET),and X-ray absorption near-edge structure(XANES).The parameters affecting the coexisting removal of chromate and phosphate by Mg-Al-CO3 LDHs included pH,reaction time,coexisting anions,and various initial concentrations of adsorbate.The maximum adsorption capacities by Mg-Al-CO3 LDHs for chromate and phosphate were 0.042 and 0.146 mmol/g,respectively.Five kinetic models were processed to investigate adsorption mechanisms,and Elovich kinetic model best resembled the experimental data.The competitive adsorption experiments revealed that the adsorption of chromate was restrained by only a small amount of phosphate while the chromate would not inhibit the adsorption of phosphate.The XANES analysis indicated that chromate adsorbed on Mg-Al-CO3 LDHs was bonded with Al based on edges of Al(OH)3 layers.
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出版历程
  • 收稿日期:  2014-12-31
  • 刊出日期:  2015-10-14

碳酸根型镁铝水滑石对铬酸根和磷酸根离子的吸附性能

  • 1. 泉州师范学院资源与环境科学学院, 泉州 362000
  • 2. 福建师范大学地理科学学院, 福州 350007
  • 收稿日期:  2014-12-31
基金项目:

国家自然科学基金资助项目(41401555)

摘要: 为研究水滑石类材料对水体中铬酸根和磷酸根离子的同时吸附去除性能,采用共沉淀法合成碳酸根型镁铝水滑石(Mg-Al-CO3 LDHs),利用傅立叶转换红外光谱、X射线晶体衍射、表面积、X光吸收近边结构等手段对合成材料进行表征,并研究Mg-Al-CO3 LDHs在不同初始浓度、pH、吸附时间、阴离子干扰条件下同时去除铬酸根和磷酸根离子的性能。结果表明,Mg-Al-CO3 LDHs对铬酸根和磷酸根离子最大吸附量分别为0.042 mmol/g和0.146 mmol/g。吸附动力学实验数据的拟合结果以Elovich为最佳。竞争实验表明,溶液中含有少量磷酸根离子即可抑制铬酸根离子的吸附,但铬酸根离子对磷酸根离子的吸附影响不大。X光吸收近边结构结果表明,铬与构造中心的铝产生键结而吸附。

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