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中国农学通报 ›› 2015, Vol. 31 ›› Issue (16): 212-217.doi: 10.11924/j.issn.1000-6850.casb15010108

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

Mg-Al水滑石的制备及对Cr(VI)阴离子吸附效果研究

徐文皓,朱 健,王 平,陈 仰,黄晓薇   

  1. (中南林业科技大学环境科学与工程学院,长沙 410004)
  • 收稿日期:2015-01-15 修回日期:2015-03-19 接受日期:2015-03-25 出版日期:2015-07-27 发布日期:2015-07-27
  • 通讯作者: 王 平
  • 基金资助:
    湖南省高校创新平台开放基金项目“柱撑硅藻土固定污染土壤中Pb、Cd效果与机理研究”(13K070);湖南省自然科学省市联合基金重点项目“硅藻土净水制品及以其为核心含重金属离子废水处理技术研究”(12JJ8016)。

Preparation of Mg-Al Hydrotalcite and Its Adsorption Property on Cr(VI) Anion

Xu Wenhao, Zhu Jian, Wang Ping, Chen Yang,Huang Xiaowei   

  1. (College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004)
  • Received:2015-01-15 Revised:2015-03-19 Accepted:2015-03-25 Online:2015-07-27 Published:2015-07-27

摘要: 为了寻求对水体中重金属阴离子具有较好效果的吸附剂,并探讨其最佳的制备条件,笔者研究了Mg-Al型水滑石对Cr(VI)阴离子的吸附,通过平衡吸附的单因素试验和正交试验,考察了Mg/Al离子比、制备过程中的pH、反应温度以及陈化时间等制备条件下Mg-Al-LDHs对Cr(VI)阴离子的吸附效果的影响。结果表明,当Mg/Al离子比为2:1、制备过程中pH保持在10.5左右、反应温度控制在90℃左右以及陈化时间达到24 h及以上时,所制成的Mg-Al-LDHs对Cr(VI)阴离子有较好的吸附效果,其吸附量可以达到10.5 mg/g。该试验确定了具有较好吸附效果的Mg-Al型水滑石的最佳制备条件,对重金属阴离子吸附材料的选择以及Mg-Al型水滑石对Cr(VI)阴离子吸附性能的研究提供了一定的参考。

关键词: 朱顶红, 朱顶红, 广州, 园艺性状, 冬季, 盆栽

Abstract: In order to find a relatively effective adsorbent for water dissolved heavy metal anions, and to explore the optimal preparation conditions, the adsorption of Mg-Al hydrotalcite on Cr(VI) anion was studied. In the experiment, several factors, including ion ratio of Mg/Al, pH, reaction temperature and aging time, were investigated to analyze the effect of adsorption of Mg-AL-LDHs on Cr(VI) anion by single factor tests and orthogonal experiments of equilibrium adsorption. The results indicated that when the ion ratio of Mg/Al was 2:1, the pH during preparation process was 10.5, the reaction temperature was 90℃ and the aging time was longer than 24 h, as-prepared Mg-Al-LDHs showed best adsorption effect on Cr(VI) with the adsorption amount up to 10.5 mg/g. In summary, the optimal preparation conditions were determined to fabricate Mg-Al hydrotalcite with effective adsorption capacity, which might provide certain guidance for the choosing of heavy metal anion adsorption material and the research on the adsorption properties of Mg-Al hydrotalcite on Cr(VI).