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Decolourisation, mineralisation and detoxification of mixture of azo dyes using Fenton and Fenton-type advanced oxidation processes
Chemical Papers ( IF 2.2 ) Pub Date : 2020-04-09 , DOI: 10.1007/s11696-020-01147-9 John Elisa Kumar , Tsungom Mulai , Wanshanlang Kharmawphlang , Rajeshwar Nath Sharan , Mihir Kumar Sahoo
Chemical Papers ( IF 2.2 ) Pub Date : 2020-04-09 , DOI: 10.1007/s11696-020-01147-9 John Elisa Kumar , Tsungom Mulai , Wanshanlang Kharmawphlang , Rajeshwar Nath Sharan , Mihir Kumar Sahoo
COD and TOC removal studies of mixture of two azo dyes viz. Ponceau Xylidine and calconcarboxylic acid by Fenton and Fenton-type processes were undertaken using \({\text{H}}_{2} {\text{O}}_{2}\) (HP) and \({\text{Na}}_{2} {\text{S}}_{2} {\text{O}}_{8}\) (SPS) as oxidants. A decolourisation of 94% in 1 min was achieved under optimised parameters, although mixing of dyes caused a retardation of mineralisation when compared with individual dyes. The study has established that treatment can be carried out at the natural pH of the dye solution in \({\text{Fe}}^{2 + }\)/SPS system. This makes the treatment process economically viable. \({\text{Fe}}^{2 + }\)/SPS system at pH 3 and 4.9 was found to be more efficient than \({\text{Fe}}^{2 + }\)/HP system as far as mineralisation is concerned. We could achieve 100% consumption of HP within 5 min of reaction, and therefore, no interference of HP on COD measurement is expected. The removal efficiency of different water quality parameters was found to be in the order: colour > \({\text{COD}}_{\text{eff}}\) > \({\text{TOC}}_{\text{eff}}\). Both COD and TOC removals followed pseudo-first-order kinetics. During the degradation process, 74% azo bonds were found to convert to \({\text{NH}}_{4}^{ + }\) and the rest to other nitrogenous products. Different ions and intermediates have been identified by ion chromatography. Based on the toxicity assay, we have recommended microorganism selection criteria for toxicity assay depending on the nature of recipient water body. Our results of detoxification measurement suggest that Escherichia coli-based assay could be used for fresh water and Vibrio fischeri for marine environment.
中文翻译:
使用Fenton和Fenton型高级氧化工艺对偶氮染料混合物进行脱色,矿化和解毒
两种偶氮染料混合物的COD和TOC去除研究,即。用\({\ text {H}} _ {2} {\ text {O}} _ {2} \)(HP)和\({\ text {Na}} _ {2} {\ text {S}} _ {2} {\ text {O}} _ {8} \)(SPS)作为氧化剂。在优化的参数下,可以在1分钟内实现94%的脱色,尽管与单独的染料相比,染料的混合导致了矿化的延迟。研究表明,可以在\({\ text {Fe}} ^ {2 +} \) / SPS系统中,在染料溶液的自然pH值下进行处理。这使得治疗过程在经济上可行。发现在pH 3和4.9的\({\ text {Fe}} ^ {2 +} \) / SPS系统比就矿化而言,\({\ text {Fe}} ^ {2 +} \) / HP系统。我们可以在5分钟内达到100%的HP消耗量,因此,预计HP对COD测量不会产生干扰。发现不同水质参数的去除效率依次为:颜色> \({\ text {COD}} _ {\ text {eff}} \) > \({\ text {TOC}} __ \ text {eff}} \)。COD和TOC的去除均遵循伪一级动力学。在降解过程中,发现74%的偶氮键会转换为\({\ text {NH}} _ {4} ^ {+} \)其余的用于其他含氮产品。通过离子色谱法已经鉴定出不同的离子和中间体。基于毒性分析,我们根据受体水体的性质,推荐了用于毒性分析的微生物选择标准。我们的排毒测量结果表明,基于大肠杆菌的测定可用于淡水,而费氏弧菌可用于海洋环境。
更新日期:2020-04-09
中文翻译:
使用Fenton和Fenton型高级氧化工艺对偶氮染料混合物进行脱色,矿化和解毒
两种偶氮染料混合物的COD和TOC去除研究,即。用\({\ text {H}} _ {2} {\ text {O}} _ {2} \)(HP)和\({\ text {Na}} _ {2} {\ text {S}} _ {2} {\ text {O}} _ {8} \)(SPS)作为氧化剂。在优化的参数下,可以在1分钟内实现94%的脱色,尽管与单独的染料相比,染料的混合导致了矿化的延迟。研究表明,可以在\({\ text {Fe}} ^ {2 +} \) / SPS系统中,在染料溶液的自然pH值下进行处理。这使得治疗过程在经济上可行。发现在pH 3和4.9的\({\ text {Fe}} ^ {2 +} \) / SPS系统比就矿化而言,\({\ text {Fe}} ^ {2 +} \) / HP系统。我们可以在5分钟内达到100%的HP消耗量,因此,预计HP对COD测量不会产生干扰。发现不同水质参数的去除效率依次为:颜色> \({\ text {COD}} _ {\ text {eff}} \) > \({\ text {TOC}} __ \ text {eff}} \)。COD和TOC的去除均遵循伪一级动力学。在降解过程中,发现74%的偶氮键会转换为\({\ text {NH}} _ {4} ^ {+} \)其余的用于其他含氮产品。通过离子色谱法已经鉴定出不同的离子和中间体。基于毒性分析,我们根据受体水体的性质,推荐了用于毒性分析的微生物选择标准。我们的排毒测量结果表明,基于大肠杆菌的测定可用于淡水,而费氏弧菌可用于海洋环境。