铁柱撑膨润土与H_2O_2联合处理酸性大红模拟染料废水

Treatment of Simulant Acid Scarlet Dye Wastewater with Fe-Pillared Bentonite and H_2O_2

以天然膨润土为载体,采用离子交换法制备了铁柱撑膨润土(Fe-Bent)催化剂,并与H_2O_2组成类芬顿体系,对酸性大红模拟染料废水进行降解处理;考察了Fe-Bent催化剂用量、H_2O_2浓度、溶液pH、反应温度和反应时间对酸性大红去除率的影响,并对Fe-Bent催化剂进行了XRD表征。表征结果显示,Fe-Bent催化剂中铁以α-Fe_2O_3的形态存在。实验结果表明,在Fe-Bent催化剂用量1.0 g、H_2O_2的浓度6 mmol/L、溶液pH 3.0、反应温度60℃、反应时间80 min的适宜条件下,处理100 mL质量浓度为20 mg/L的酸性大红模拟染料废水,酸性大红的去除率可达94.87%。Fe-Bent催化剂的稳定性较好,循环使用4次后仍具有较高活性。

An Fe-pillared bentonite（Fe-Bent） catalyst was prepared by ion-exchange method with natural bentonite as the support and a Fenton-like system composed of Fe-Bent and H2O2 was used to treat simulant acid scarlet dye wastewater. The effects of Fe-Bent dosage, H2O2 concentration, solution pH, reaction temperature and reaction time on the removal rate of the acid scarlet were investigated. The Fe-Bent catalyst was characterized by means of XRD, which showed the existence of α-Fe2O3 in the Fe-Bent catalyst. The removal rate of the acid scarlet in the simulant dye wastewater reached 94.87% under the conditions of simulant dye wastewater with 20 mg/L acid scarlet 100 mL, Fe-Bent catalyst dosage 1.0 g, H202 concentration 6 mmol/L, solution pH 3.0, reaction temperature 60 ℃ and reaction time 80 min. The Fe-Bent catalyst showed good stability and high activity for the degradation of the simulant acid scarlet dye wastewater after four recycles.