| 小分子有机酸对铁(氢)氧化物表面吸附的砷酸盐的解吸作用研究 |
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| 引用本文： | 杨凯光,邓芊,毛丹,花修艺,梁大鹏,郭志勇,董德明.小分子有机酸对铁(氢)氧化物表面吸附的砷酸盐的解吸作用研究[J].科学技术与工程,2014,14(20). |
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| 作者姓名： | 杨凯光 邓芊 毛丹 花修艺 梁大鹏 郭志勇 董德明 |
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| 作者单位： | 地下水资源与环境教育部重点实验室，水资源与环境吉林省重点实验室，吉林大学环境与资源学院,地下水资源与环境教育部重点实验室，水资源与环境吉林省重点实验室，吉林大学环境与资源学院,地下水资源与环境教育部重点实验室，水资源与环境吉林省重点实验室，吉林大学环境与资源学院,地下水资源与环境教育部重点实验室，水资源与环境吉林省重点实验室，吉林大学环境与资源学院,地下水资源与环境教育部重点实验室，水资源与环境吉林省重点实验室，吉林大学环境与资源学院,地下水资源与环境教育部重点实验室，水资源与环境吉林省重点实验室，吉林大学环境与资源学院,地下水资源与环境教育部重点实验室，水资源与环境吉林省重点实验室，吉林大学环境与资源学院 |
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| 基金项目： | 国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 摘 要： | 采用等温解吸热力学的方法,结合X射线衍射(XRD)与比表面积分析,研究了柠檬酸、草酸和NaCl溶液在pH 6.5环境下对水铁矿、针铁矿和赤铁矿表面吸附砷酸盐的解吸特性。实验结果表明,柠檬酸的解吸能力最强,草酸次之,NaCl最差。这主要是由于柠檬酸和草酸可通过配位交换和诱导配体溶解来解吸砷。但由于柠檬酸分子中可配位-OH多于草酸,因而其解吸能力强于草酸。赤铁矿吸附的砷酸盐最易解吸,而水铁矿吸附的砷酸盐则最难解吸,这与水铁矿具有较大的比表面积和较高的表面活性有关。
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| 关 键 词： | 铁( 氢) 氧化物 砷酸盐 柠檬酸 草酸 解吸 |
| 收稿时间： | 2014/2/28 0:00:00 |
| 修稿时间： | 3/1/2014 12:00:00 AM |
The Desorption Characteristics of Arsenate from Iron (Hydr)Oxides by Low-molecular-weight Organic Acid |
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| Yang Kai-guang,Deng Qian,Mao Dan,Hua Xiu-yi,Liang Da-peng,Guo Zhi-yong and Dong De-ming.The Desorption Characteristics of Arsenate from Iron (Hydr)Oxides by Low-molecular-weight Organic Acid[J].Science Technology and Engineering,2014,14(20). |
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| Authors: | Yang Kai-guang Deng Qian Mao Dan Hua Xiu-yi Liang Da-peng Guo Zhi-yong and Dong De-ming |
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| Institution: | Key Lab of Groundwater Resources and Environment of Ministry of Education,Key Lab of Water Resources and Aquatic Environment of Jilin Province,College of Environment and Resources,Jilin University,Key Lab of Groundwater Resources and Environment of Ministry of Education,Key Lab of Water Resources and Aquatic Environment of Jilin Province,College of Environment and Resources,Jilin University,Key Lab of Groundwater Resources and Environment of Ministry of Education,Key Lab of Water Resources and Aquatic Environment of Jilin Province,College of Environment and Resources,Jilin University,Key Lab of Groundwater Resources and Environment of Ministry of Education,Key Lab of Water Resources and Aquatic Environment of Jilin Province,College of Environment and Resources,Jilin University,Key Lab of Groundwater Resources and Environment of Ministry of Education,Key Lab of Water Resources and Aquatic Environment of Jilin Province,College of Environment and Resources,Jilin University,Key Lab of Groundwater Resources and Environment of Ministry of Education,Key Lab of Water Resources and Aquatic Environment of Jilin Province,College of Environment and Resources,Jilin University |
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| Abstract: | Arsenic adsorbed by iron (hydr)oxides can be desorbed by low-molecular-weight organic acid. Through the method of isothermal desorption thermodynamics, combined with the techniques of X-ray diffraction (XRD) and specific surface area analysis, the desorption characteristics of arsenate adsorbed on the surface of ferrihydrite, goethite and hematite by citric acid, oxalic acid and NaCl solution were researched. The results showed that desorption ability of three desorption systems was as the order: citric acid > oxalic acid > NaCl solution. This could be attributed to the mechanism, that citric acid and oxalic acid could significantly promote desorption reaction through ligand exchange and ligand-enhanced dissolution. However, for the molecule of citric acid has more -OH ligand than oxalic acid, citric acid had greater desorption ability. Arsenic adsorbed by hematite was the easiest to be desorbed, whereas that adsorbed by ferrihydrite was the hardest to be desorbed, which was connected with larger specific surface area and higher surface activity of ferrihydrite. |
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| Keywords: | iron (hydr)oxides arsenate citric acid oxalic acid desorption |
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