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A study on the reductive dechlorination of chloroform with nano Fe/Cu bimetallic particles in aqueous solution

In this work, nano-Fe/Cu bimetallic particles are synthesized and used to reduce chloroform to methane in aqueous solution. The synthesized particles are characterized by X ray diffraction (XRD) pattern, Transmission electron microscopy (TEM) images and energy dispersive X ray (EDX) analysis. | ISSN 1859-1531 - THE UNIVERSITY OF DANANG, JOURNAL OF SCIENCE AND TECHNOLOGY, NO. 6(127).2018 13 A STUDY ON THE REDUCTIVE DECHLORINATION OF CHLOROFORM WITH NANO Fe/Cu BIMETALLIC PARTICLES IN AQUEOUS SOLUTION Phan Kim Nguyen, Bui Xuan Vung University of Education – The University of Danang; vungxuanbui@gmail.com Abstract - In this work, nano-Fe/Cu bimetallic particles are synthesized and used to reduce chloroform to methane in aqueous solution. The synthesized particles are characterized by X ray diffraction (XRD) pattern, Transmission electron microscopy (TEM) images and energy dispersive X ray (EDX) analysis. Such key parameters on the reduction of chloroform as pH, nano-Fe/Cu dosage, treatment time have been investigated. Closed batch experiments have been conducted for this investigation. Experimental results show that the de-chlorination of 50 mL of 20 ppm chloroform aqueous solution has the highest degradation efficiency of 88.93% under the experimental conditions such as pH = 3, reaction time of 30 minutes and nano-Fe/Cu dosage of 0.05 gram. GC-MS analysis for a 20 ppm chloroform aqueous solution before and after treatment has shown that there is no formation of such products containing chlorine as CH2Cl2 and CH3Cl. Key words - Nano-Fe/Cu; bimetallic particles; chloroform; de-chlorination; degradation; aqueous solution. 1. Introduction Trihalomethanes including mainly chloroform (CHCl3) are disinfection by-products formed when using chlorine for disinfecting drinking water [1] and treated wastewater before it is conveyed into water distribution systems [2]. Chlorine is by far the most widely used chemical disinfectant in water and wastewater treatment. These byproducts are linked to a direct health risk such as liver and kidney cancer, nervous system and reproductive effects. The recommended concentration value by WHO for chloroform in drinking water is 0.3 mg/L [1]. Many technologies such as advanced oxidation, air stripping, and physical adsorption have