Corresponding Author Qunshan Wei Tel.: +86 18017344008; Fax: +86 02167792557; E-mail: [email protected] Affiliation Felix O. Mcyotto1, Qunshan Wei*, 1, 2, Christopher W.K. Chow3, Zuhair Nadeem1, Zheng Li 1, 2, Jianshe Liu 1, 2 1 School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China. 2 Textile Pollution Controlling Engineering Center of Ministry of Environmental Protection, Shanghai 201620, China. 3 Natural and Built Environments Research Centre, School of Natural and Built Environments, University of South Australia, SA 5095, Australia. AbstractThe coagulation performance of Bentonite (BE) aided by Sodium Alginate (SA) to remove basic dyes was investigated. Four basic dyes Rhodamine B (RB), Malachite Green (MG), Methylene Blue (MB) and Basic Violet 14 (BV) were used to cover a range of variations in the experiments. It was found that the removal of the dyes increased with addition of SA as the flocculant/coagulant aid. Bentonite as a natural coagulant aided by the biodegradable flocculant, SA, is an effective combination for removal of basic dyes (color removal). The effect of coagulant dosage on the overall dye removal efficiency/decolorization rate was explored and followed by the investigation of the mechanism of dye removal by coagulation process. Optimum dye removal efficiencies for RB, MG, MB and BV by using both Bentonite and Sodium Alginate combined were, 91.5%, 98.2%, 98.5%, 98.8%, respectively with pH set at 9.0. FTIR was used to characterize the sludge to determine the functional groups. The resultant outcome in this study indicates that using Bentonite as a natural coagulant, aided by a biodegradable flocculant, Sodium Alginate, provides an effective and environmentally friendly coagulation option for removing color from basic dyes.
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