高铁酸盐对酚类污染物处理的研究
摘要
本文利用铁丝为阳极,铜为阴极,NaOH溶液为电解液,陶瓷膜为隔膜,于双隔膜电解槽中电解制备高铁酸钠。阳极容积的减小,一定范围内缓冲室容积的增加,电解液浓度的增加,隔膜孔径的减小,适宜的温度范围均有利于提高Na2FeO4的生成浓度。
利用自制的高铁酸钾氧化降解苯酚、对氯苯酚、双酚A模拟废水,考察了高铁酸盐投加量、pH、反应时间等因素对有机物处理效果的影响及规律,确定的优化工艺条件为, K_2FeO_4为35.3mg、pH为9、t为50min和C_6H_5ClO浓度50.47 mg/L时,此条件下对氯苯酚的CODCr去除率为74.5%;苯酚初始浓度为50mg/l、投加量比R为20:1、pH9、t为20min,此条件下苯酚去除率为83.6%。结果表明增加高铁酸盐投加量、延长反应时间均可增加被处理分子的降解率,pH对降解效果的影响较大。此外通过高铁酸钾分别氧化降解含2氯酚、4氯酚、2,4-二氯酚和几种甲酚的同分异构体的模拟废水,表明芳环上的取代基位置和数量对氧化效果具有重要影响。
同时通过GC-MS对其降解产物进行了分析,探讨了可能的氧化机制,并通过对Fe~(3+)吸附絮凝效果的研究,表明高铁酸盐氧化与其分解后形成的水解产物吸附的协同作用使其能够有效去除水中有机污染物的重要原因。
Sodium ferrate was prepared by electrolysis of ferreous as anode,brass wire as cathode, sodium hydroxide as solutions and ceramics diaphragm as diaphragm. The decrease of anode cell volume, the increase of divided cell in appropriate scope, the increase of electrolyte concentration, the decrease of diaphragm aperture and proper temperature will all improve sodium ferrate concentration.
The produced potassium ferrate can degrade analog wastewater containing phenol p-chlorophenol(p-CP), bisphenol A (BPA). Factors of the amount of ferrate, initially pH Value, organic contamination and treat time were discussed, The optimal conditionswere as follows: The solution of 50.47 mg/L 4-CP(pH=9) was oxidated at 35.3mg/L K_2FeO_4 for 50 min and CODCr degration efficiency can reach 90.3% by orthogonality experiment. The solution of 50 mg/L phenol(pH=9) was oxidated at 20:1 ferrate:phenol molar ratio for 30 min and concentration degration efficiency can reach 83.6%. The result showed that increase ferrate amounts and time and decrease the initial concentration of organic contamination can promote the oxidation reaction. PH is also important to remove phenol. Besides, the ferrate oxidation of chlorophenols including 4-chlorophenol (CP) 2, 4-dichlorophenol 2-chlorophenol and the isomeric compound of cresol in aqueous solution was investigated.It showed that the quantity of substituting group and ites sites had an importent influence on the result of the oxidation.
The final products by GC-MS were analyzed, the possible oxidation mechanism were discussed. The study of the absorption of Fe~(3+) showed that the combined effect of oxidation by ferrate and adsorption by hydrolysed iron from ferrate decomposition was believed to be the primary reason for effective organic pollutants removal from surface water by ferrate.
利用自制的高铁酸钾氧化降解苯酚、对氯苯酚、双酚A模拟废水,考察了高铁酸盐投加量、pH、反应时间等因素对有机物处理效果的影响及规律,确定的优化工艺条件为, K_2FeO_4为35.3mg、pH为9、t为50min和C_6H_5ClO浓度50.47 mg/L时,此条件下对氯苯酚的CODCr去除率为74.5%;苯酚初始浓度为50mg/l、投加量比R为20:1、pH9、t为20min,此条件下苯酚去除率为83.6%。结果表明增加高铁酸盐投加量、延长反应时间均可增加被处理分子的降解率,pH对降解效果的影响较大。此外通过高铁酸钾分别氧化降解含2氯酚、4氯酚、2,4-二氯酚和几种甲酚的同分异构体的模拟废水,表明芳环上的取代基位置和数量对氧化效果具有重要影响。
同时通过GC-MS对其降解产物进行了分析,探讨了可能的氧化机制,并通过对Fe~(3+)吸附絮凝效果的研究,表明高铁酸盐氧化与其分解后形成的水解产物吸附的协同作用使其能够有效去除水中有机污染物的重要原因。
Sodium ferrate was prepared by electrolysis of ferreous as anode,brass wire as cathode, sodium hydroxide as solutions and ceramics diaphragm as diaphragm. The decrease of anode cell volume, the increase of divided cell in appropriate scope, the increase of electrolyte concentration, the decrease of diaphragm aperture and proper temperature will all improve sodium ferrate concentration.
The produced potassium ferrate can degrade analog wastewater containing phenol p-chlorophenol(p-CP), bisphenol A (BPA). Factors of the amount of ferrate, initially pH Value, organic contamination and treat time were discussed, The optimal conditionswere as follows: The solution of 50.47 mg/L 4-CP(pH=9) was oxidated at 35.3mg/L K_2FeO_4 for 50 min and CODCr degration efficiency can reach 90.3% by orthogonality experiment. The solution of 50 mg/L phenol(pH=9) was oxidated at 20:1 ferrate:phenol molar ratio for 30 min and concentration degration efficiency can reach 83.6%. The result showed that increase ferrate amounts and time and decrease the initial concentration of organic contamination can promote the oxidation reaction. PH is also important to remove phenol. Besides, the ferrate oxidation of chlorophenols including 4-chlorophenol (CP) 2, 4-dichlorophenol 2-chlorophenol and the isomeric compound of cresol in aqueous solution was investigated.It showed that the quantity of substituting group and ites sites had an importent influence on the result of the oxidation.
The final products by GC-MS were analyzed, the possible oxidation mechanism were discussed. The study of the absorption of Fe~(3+) showed that the combined effect of oxidation by ferrate and adsorption by hydrolysed iron from ferrate decomposition was believed to be the primary reason for effective organic pollutants removal from surface water by ferrate.
引文
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