印迹膜复合双极膜去除水中2,4-DCP的研究

发布时间：2018-07-03 00:12

  本文选题：2 + 4-二氯酚　； 参考：《福建师范大学》2015年硕士论文

【摘要】：以2,4-二氯酚(2,4-DCP)为印迹分子,羧甲基纤维素钠(CMC)或海藻酸钠(SA)为功能单体制备了 2,4-DCP印迹膜,通过平衡吸附试验、渗透平衡实验,研究了功能单体种类、光照条件、聚乙烯醇(PVA)的添加量、CMC与2,4-DCP质量比、交联洗脱顺序等因素对2,4-DCP印迹膜的吸附性能和渗透性能的影响,确定了印迹膜制备的最佳方法和条件参数。当CMC:2,4-DCP质量比为90:4,CMC:PVA质量比为3:2,在避光条件下风干,先交联后洗脱可制得性能最佳的2,4-DCP印迹膜。在30mg/L的2,4-DCP溶液中,吸附2h左右达到平衡,吸附量可达0.375mg/g,渗透实验在3h左右达到平衡,渗透量可达0.86mg/dm2,对该印迹膜进行动力学分析,结果显示,印迹膜对2,4-DCP的吸附过程符合准二级动力学方程。以Ti网作为基体材料,用电沉积法制备了 Pd/Ti载钯催化电极,通过SEM观察表明,Pd/Ti电极表面负载有小颗粒的钯,用XRD表征了制备的电极,说明Ti网上有Pd存在。基于修饰电极具有较强的电催化性能,以制备的Pd/Ti电极作为阴极,以CMC-PVA/CS-PVA双极膜作为隔膜,对2,4-DCP溶液进行处理,考察了不同电极、不同硫酸浓度、不同2,4-DCP初始浓度对2,4-DCP去除率的影响。结果表明,与空白Ti电极相比,Pd/Ti电极因具有更多的催化位点,电解时槽电压较未修饰的Ti网电极小,对2,4-DCP具有更强的去除能力,在硫酸浓度≥0.25M时,硫酸浓度与2，4-DCP初始浓度对2,4-DCP的去除率影响不大,电解200min后,2,4-DCP的去除率可达90%左右。在制备的Pd/Ti电极表面采用流延法制备印迹膜复合双极膜,以复合的印迹膜-双极膜作为电解槽隔膜,Pd/Ti网电极作为阴极,对2,4-DCP进行去除实验。探讨了不同电极、不同膜、硫酸浓度、2,4-DCP初始浓度等因素对2,4-DCP去除率的影响。结果显示,复合的印迹膜-双极膜与双极膜相比能够更有效地提高2，4-DCP的去除速度,缩短去除时间。当硫酸浓度较低时,硫酸浓度的提高有利于2，4-DCP的去除;当硫酸浓度达到0.5 M时,硫酸浓度的增加对2,4-DCP的去除率基本不产生较大的影响。2,4-DCP初始浓度越高,初始降解速度越快,降解量越多,但2,4-DCP初始浓度对其去除率影响不大,均可达到80%-90%。实验表明,印迹膜结合双极膜技术处理2,4-DCP溶液,可提高电极表面2,4-DCP的浓度,提高其去除速度,缩短去除时间,是去除溶液中2,4-DCP的有效方法。
[Abstract]:The imprinted membrane was prepared by using 2O4-DCP as imprinted molecule and sodium carboxymethyl cellulose (CMC) or sodium alginate (SA) as functional monomer. The species and illumination conditions of functional monomers were studied by equilibrium adsorption test and osmotic equilibrium experiment. The effects of the addition amount of PVA and the mass ratio of CMC to 2n4-DCP, the sequence of cross-linking and elution on the adsorption and permeability of the imprinted membrane were investigated. The optimum preparation method and conditions of the membrane were determined. When the mass ratio of CMC _ 2 to CD _ 4-DCP is 90: 4 and the mass ratio of CMC _ (1) to PVA is 3: 2, the best 2C4-DCP imprinted membrane can be prepared by air-drying, first crosslinking and then eluting under the condition of avoiding light. In 30 mg / L 2nd-DCP solution, the adsorption reached equilibrium for 2 hours, the adsorption capacity reached 0.375 mg / g, and the osmotic experiment reached equilibrium at about 3 h, and the osmotic capacity reached 0.86 mg / dm2.The kinetic analysis of the imprinted membrane showed that, The adsorption process of 2O4-DCP by imprinted membrane accords with the quasi second order kinetic equation. PD / Ti supported palladium catalytic electrode was prepared by electrodeposition with Ti mesh as substrate. SEM observation showed that there were small particles of palladium on the surface of PD / Ti electrode. The prepared electrode was characterized by XRD, indicating that PD exists on Ti network. Based on the strong electrocatalytic performance of the modified electrode, the prepared PD / Ti electrode was used as cathode and CMC-PVA / CS-PVA bipolar membrane was used as the diaphragm to treat 24-DCP solution. The different electrode and different sulfuric acid concentration were investigated. The effect of different initial concentration of 2O4-DCP on the removal rate of 2O4-DCP. The results show that compared with the blank Ti electrode, the PD / Ti electrode has more catalytic sites, and the electrolytic cell voltage is smaller than that of the unmodified Ti grid electrode, and it has a stronger removal capacity to 24-DCP. When the sulfuric acid concentration is 鈮，

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