锆基纳米复合材料深度净化水体中的微量重金属

发布时间：2018-06-06 00:15

  本文选题：氧化锆 + 树脂　； 参考：《燕山大学》2015年硕士论文

【摘要】：本文基于Donnan膜原理,成功制备了载氧化锆的纳米复合树脂,并研究了其对水体中微量Pb2+、Cu2+的选择吸附性能,解决了Zr O2颗粒流体动力学性能差的应用瓶颈;在此基础上,对载氧化锆的纳米复合树脂进行了改进,制备出载氧化锆-羟基氧化镁双氧化物的纳米复合吸附材料,研究其在酸性条件下的吸附性能,并与载氧化锆的纳米复合树脂及树脂母体进行对比。论文研究成果将为水体重金属安全控制提供可行的技术支持。论文首先通过表面沉积技术合成了Zr O2-001纳米复合材料并考察了其对Pb2+、Cu2+的吸附行为。Zr O2-001对Pb2+、Cu2+的吸附最佳吸附p H值为5-6.5之间;吸附等温线能较好地符合Langmuir方程;吸附时不属于快速吸附过程且用伪一级动力学方程和伪二级动力学方程均能很好拟合;与传统的离子交换树脂D001相比,在高浓度Ca2+、Na+、Mg2+竞争的条件下,Zr O2-001对Pb2+、Cu2+表现出较强的吸附选择性。经过5个批次静态吸附-脱附稳定性实验,Zr O2-001对Pb2+和Cu2+都呈现出相对稳定的吸附去除效率,保持优异的吸附性能。论文将Zr OCl2·8H2O和Mg(NO3)2担载到含有磺酸基团的阳离子交换树脂D001内,制备出纳米复合树脂Zr-Mg-001。担载于D001孔道内的氧化锆及羟基氧化镁为无定形。通过研究Zr-Mg-001在酸性条件下对典型重金属阳离子Cu2+的吸附性能及吸附机理,揭示了Zr-Mg-001对重金属Cu2+的吸附效果随p H值变化的过程且受温度变化的影响。当水体中存在大量Ca2+离子竞争的条件下吸附性能会受到较大影响,但与Zr O2-001和D001相比仍表现出优异的吸附性能。在处理能力方面,Zr-Mg-001在相同条件下比Zr O2-001处理量优异3倍以上,并且可在酸性条件下达到较好的处理效果。
[Abstract]:Based on the principle of Donnan membrane, the nano-composite resin loaded with zirconia has been successfully prepared, and its selective adsorption performance for trace Pb2 Cu2 in water has been studied, which solves the bottleneck of poor hydrodynamic performance of ZrO 2 particles. The nano-composite resin loaded with zirconia was improved to prepare the nano-composite adsorption material carrying zirconia and magnesium hydroxide, and its adsorption properties under acidic conditions were studied. The results were compared with the nano-composite resin and resin matrix loaded with zirconia. The research results will provide feasible technical support for the safety control of heavy metals in water. Firstly, ZrO2-001 nanocomposites were synthesized by surface deposition technique, and the adsorption behavior of ZrO2-001 on Pb2 Cu2 was investigated. The optimum adsorption pH value of ZrO2-001 on Pb2 Cu2 was 5-6.5, and the adsorption isotherm was in good agreement with Langmuir equation. The adsorption is not a rapid adsorption process and can be fitted well by pseudo-first-order kinetic equation and pseudo-second-order kinetic equation, compared with the traditional ion exchange resin D001. Under the condition of high concentration of Ca2 Na / mg _ 2, the adsorption selectivity of Pb2 _ (2) O _ (2-001) to Pb2 _ (鈪，

本文编号：1984078