改性微电解法处理对苯二酚废水

发布时间：2018-03-20 05:06

本文选题：对苯二酚　切入点：微电解　出处：《吉林大学》2015年硕士论文　论文类型：学位论文

【摘要】：对苯二酚是重要的化工原料，该产品用途广泛，是农药、医药和染料的重要中间体，用于制造蒽醌、偶氮染料及感光材料，，同时，对苯二酚被广泛用作抗氧化剂，用于橡胶及食品防腐。因此，对苯二酚大量存在于各种工业废水中，如染料废水、橡胶工业废水及制药废水。由于对苯二酚对水生生物具有潜在毒性，因此含对苯二酚废水的大量排放会对生态环境及人类健康构成严重威胁，对苯二酚废水的处理势在必行。本研究采用微电解法处理对苯二酚废水，以传统铁-碳微电解填料为基础，加入锰、锌、铜粉对其进行改性，制备规整化的改性铁-锰-碳填料、铁-锌-碳填料及铁-铜-碳填料，并探究了三种改性填料对对苯二酚的去除效果，考察了改性填料的种类、填料投加量、反应时间、改性填料中添加剂的含量、废水初始pH等因素对对苯二酚去除率的影响。研究中测定了整个反应过程的溶液pH变化情况，对填料改性前后进行了SEM、XRD表征分析，同时采用GC-MS对对苯二酚的降解中间产物进行分析，从而推断改性微电解法降解对苯二酚的途径。研究结果表明，与传统铁-碳微电解填料相比，本研究制备的三种改性填料（铁-锰-碳填料、铁-锌-碳填料及铁-铜-碳填料）中，铁-锰-碳改性填料对对苯二酚的处理效果最好。当对苯二酚初始浓度为1000.00mg·L-1时，铁-锰-碳改性填料处理对苯二酚废水的最佳工艺条件为：填料投加量为29.17g·L-1，反应时间为4.0h，改性填料中锰粉的质量分数为9%，废水初始pH为3.00，在此条件下，废水中对苯二酚的去除率可达95.55%。与铁-碳填料相比，铁-锰-碳改性微电解填料能够大幅度提高对苯二酚的处理效果，去除率可提高42.89%，反应过程中溶液的pH大体呈现出先升高后降低的趋势，可在反应30min内上升到8.50以后又逐渐恢复到中性。采用铁-锰-碳填料处理对苯二酚模拟废水时，填料对废水初始pH的适用范围比铁-碳填料宽。研究中通过对填料的SEM和XRD表征分析及对对苯二酚降解中间产物的分析，推断出对苯二酚首先被氧化为对苯醌，然后逐渐被降解为马来酸、丙二酸和乙酸。在铁-碳填料中加入锰粉后，锰较低的电极电位更有利于电极反应的进行，从而提高了对苯二酚的去除效果，除此之外，填料中的锰氧化形成的MnO2和Mn3O4具有很高的氧化能力和反应活性，可以使对苯二酚氧化分解。
[Abstract]:Hydroquinone, an important chemical raw material, is widely used as an intermediate of pesticides, pharmaceuticals and dyes. It is used in the manufacture of anthraquinone, azo dyes and photosensitive materials. At the same time, hydroquinone is widely used as an antioxidant. It is used in rubber and food anticorrosion. Therefore, hydroquinone is abundant in various industrial wastewater, such as dye wastewater, rubber industry wastewater and pharmaceutical wastewater. Therefore, a large amount of hydroquinone wastewater discharge will pose a serious threat to the ecological environment and human health, the treatment of hydroquinone wastewater is imperative. In this study, hydroquinone wastewater was treated by micro-electrolysis. Based on the traditional iron-carbon micro-electrolytic filler, manganese, zinc and copper powder were added to modify the hydroquinone wastewater, and a regular iron-manganese-carbon filler was prepared. The effects of three kinds of modified fillers on the removal of hydroquinone were studied. The kinds of modified fillers, the dosage of fillers, the reaction time and the content of additives in the modified fillers were investigated. The influence of the initial pH of wastewater on the removal rate of hydroquinone was studied. The pH change of the solution during the whole reaction process was determined, and the SEM XRD analysis was carried out before and after the modification of the filler. At the same time, the degradation intermediate product of hydroquinone was analyzed by GC-MS, and the way of degradation of hydroquinone by modified microelectrolysis was deduced. The results show that compared with the traditional iron-carbon micro-electrolytic fillers, the three kinds of modified fillers (iron-manganese-carbon, iron-zinc-carbon and iron-copper-carbon) were prepared in this study. When the initial concentration of hydroquinone was 100mg 路L ~ (-1), the effect of Fe _ (2 +) mn ~ (2 +) -carbon modified filler was the best. The optimum technological conditions for the treatment of hydroquinone wastewater with iron-manganese-carbon modified filler are as follows: the dosage of filler is 29.17 g 路L -1, the reaction time is 4.0 h, the mass fraction of manganese powder in the modified filler is 9%, and the initial pH of wastewater is 3.00. The removal rate of hydroquinone in wastewater can reach 95.550.Compared with the iron-carbon filler, the iron-manganese-carbon modified micro-electrolytic filler can greatly improve the treatment effect of hydroquinone. The removal rate could be increased by 42.89, and the pH of the solution increased first and then decreased, and then gradually returned to neutral after 30 min reaction. When the hydroquinone simulated wastewater was treated with iron, manganese and carbon fillers, The suitable range of the initial pH of the wastewater is wider than that of the iron-carbon filler. Through the analysis of SEM and XRD characterization of fillers and the analysis of intermediate products of p-hydroquinone degradation, it was inferred that hydroquinone was first oxidized to p-benzoquinone and then degraded to maleic acid. Malonic acid and acetic acid. When manganese powder is added to iron-carbon filler, the lower electrode potential of manganese is more favorable to the electrode reaction, which improves the removal efficiency of hydroquinone. MnO2 and Mn3O4 formed by manganese oxidation in fillers have high oxidation ability and reaction activity, which can decompose hydroquinone by oxidation.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

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