Energy and Enviromental Engineering |
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Rhodamine B wastewater degradation by graphite graphite electro Fenton system |
QIU Shan1,2, CHEN Cong1,2, DENG Feng xia1,2, JI Ya wan1,2, DING Xiao3, MA Fang1,2 |
1. School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150000,China; 2. Shanghai Chengxiang Architectural Design Institute Limited Company, Shanghai 200000,China |
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Abstract Electro Fenton with graphite graphite as the electrodes was applied to degrade wastewater containing Rhodamine B (RhB). Both the influencing factors and mechanism were investigated. The effects of various operating factors including potentials, initial solution pH, Fe2+ concentration, electrode plates spacing were systematically investigated in order to obtain the optimized conditions for degradation of RhB under four levels orthogonal test of five factors. The optimum values were as follows: potential2 V, initial pH = 2.5, Fe2+ concentration 0.1 mmol/L, electrode plates spacing 4 cm. The removal rate of RhB could reach to 98.59 % under the optimum conditions. Three dimensional fluorescence, HPLC MS, UV were used to detect intermediate products of RhB during Electro Fenton. Results showed that the absorbance at 554 nm by UV was almost zero, but fluorescence peak still existed. Removal rate of TOC was 33.3 %. Certain intermediate products that have fluorescence did not completely remove. Results from HPLC MS proved that the following intermediate products produced in the Electro Fenton, likeC26H27O3N2(m/z=415)、C24H23O3N2(m/z=387) et al.
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Published: 01 April 2016
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石墨电极E Fenton法处理罗丹明B废水
采用电芬顿(Electro Fenton)法处理罗丹明B(RhB)废水,分析石墨电极Electro Fenton体系处理RhB废水的不同影响因素和机制.设计五因素四水平正交实验考察电压、溶液初始pH值、初始Fe2+浓度、极板间距等因素对RhB去除效率的影响.实验结果表明,Electro Fenton降解RhB的最优条件为:电压为2 V、初始pH值为2.5、初始Fe2+浓度为0.1 mmol/L、极板间距为4 cm.在该条件下反应60 min后,RhB降解率最高达到98.59 %.对反应溶液的中间产物进行三维荧光和高效液相色谱质谱(HPLC MS)、紫外分析.结果表明:采用Electro Fenton法处理60 min后,在波长为554 nm处RhB的吸光度为零,但仍存在荧光峰,且TOC去除率为33.3 %,可以判断有一些有荧光的中间产物没有被完全去除.用HPLC MS进行产物分析可知,可能的产物有C26H27O3N2(m/z=415)、C24H23O3N2(m/z=387)等物质.
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