MIEX树脂吸附—电解两步法去除水中溴代阻燃剂研究

发布时间：2018-05-12 07:13

本文选题：溴代阻燃剂 + MIEX树脂　；参考：《江西理工大学》2017年硕士论文

【摘要】：近年来,由于溴代阻燃剂的“三致”效应及在生产和废物处理过程中导致的水体污染问题日益加剧,严重危害了人类健康,已经引起了社会的高度关注。因此,研究高效、环保的处理技术具有重大意义。本文选取产量最高的两种典型溴代阻燃剂四溴双酚A(TBBPA)和2,4,6-三溴苯酚(TBP)为研究对象,利用磁性离子交换树脂(MIEX)吸附和以Ti基PbO2为电极电解实验研究。探讨了反应物初始浓度、共存阴阳离子、腐殖酸和初始pH值等因素对吸附效果的影响,并阐明了MIEX树脂的吸附特性。研究了目标污染物的初始浓度、电解质类型、电解质浓度、电流密度和初始pH值等因素对降解效果的影响。结果表明:(1)腐殖酸和阴离子会抑制MIEX树脂吸附TBBPA和TBP,且随其浓度增大,抑制作用增强。低于10 mg/L的Ca2+、Mg2+会促进TBBPA的吸附,继续增大浓度则会抑制;阳离子的存在会促进TBP的吸附。(2)MIEX树脂吸附TBBPA在pH=6.13时去除率可达74.3%的峰值点;吸附TBP在pH=7.80时最高可达93.3%;0.1 mol/L的NaCl对TBBPA和TBP的解吸效果更好。(3)准二级动力学模型能够更好地描述MIEX树脂对TBBPA和TBP的吸附动力学过程,Langmuir模型更适合描述其吸附平衡过程,Thomas模型和Yoon-Nelson模型更合适描述其动态吸附过程;此外,升温会促进MIEX树脂吸附TBP,但会抑制TBBPA的吸附。(4)以Ti基PbO2为电极对TBBPA和TBP的降解过程符合一级动力学模型;反应物初始浓度与降解速率呈负相关;在电流密度为0~15 mA/cm2时,随电流密度增大,降解速率增大。降解TBPPA和TBP以5 mmol/L的硫酸钠为电解质效果最好,降解速率与其浓度关系均呈山峰型。(5)TBBPA的降解效率在pH=7.62时最高可达97.02%,而对TBP在pH=6.51时达97.27%最高值;相关因素对降解TBBPA和TBP的影响顺序依次为:电流密度pH值初始浓度电解质浓度。
[Abstract]:In recent years, water pollution caused by brominated flame retardants and water pollution caused by brominated flame retardants has become more and more serious, which has caused serious harm to human health. Therefore, it is of great significance to study the treatment technology of high efficiency and environmental protection. In this paper, two typical brominated flame retardants, tetrabromobisphenol A (TBBPA) and 2-bromobisphenol 6-tribromophenol (TBPP), were selected as the research objects. The adsorption of TBBPA and the electrolysis of Ti-based PbO2 were studied by using magnetic ion exchange resin (MIEXX) and Ti based PbO2 as electrode. The effects of the initial concentration of reactants, coexistence of anion, humic acid and initial pH on the adsorption of MIEX resin were discussed. The effects of initial concentration, electrolyte type, electrolyte concentration, current density and initial pH value on degradation were studied. The results showed that humic acid and anion could inhibit the adsorption of TBBPA and TBP by MIEX resin, and the inhibitory effect increased with the increase of the concentration. The adsorption of TBBPA was promoted by Ca2 Mg2 with less than 10 mg/L, but inhibited by increasing the concentration of cations, and the removal rate of TBBPA on TBP was 74.3% at pH = 6.13 by the presence of cations. At pH = 7.80, the adsorption kinetics of TBBPA and TBP by NaCl with adsorption pH = 7.80 is better than that of TBBPA and TBP.) the quasi-second-order kinetic model can better describe the adsorption kinetic process of TBBPA and TBP by MIEX resin. The Langmuir model is more suitable for describing the adsorption equilibrium of TBBPA and TBP. Thomas model and Yoon-Nelson model are more suitable to describe the dynamic adsorption process. In addition, the increase of temperature can promote the adsorption of TBBPA by MIEX resin, but inhibit the adsorption of TBBPA. 4) the degradation of TBBPA and TBP on Ti based PbO2 electrode accords with the first-order kinetic model, the initial concentration of reactant is negatively correlated with the degradation rate, and the current density is 0 ~ 15 mA/cm2. The degradation rate increases with the increase of current density. The highest degradation efficiency of TBPPA and TBP was 97.02% at pH = 7.62, and 97.27% for TBP at pH = 6.51. The order of influencing factors on degradation of TBBPA and TBP is current density pH value initial concentration electrolyte concentration.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X52

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