The Effect of pH, Temperature, and Molecular Size on the Removal of Dyes from Textile Effluent Using Manganese Oxides-Modified Diatomite

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This work is an investigation on the use of manganese oxides-modified diatomite (MOMD) for the removal of color from textile wastewaters. The modification of the diatomite was carried out by treatment with manganese oxides; δ–birnessite type resulted. The surface area, pHZPC, Fourier transform infrared (FTIR), and scanning electron microscopy of MOMD were studied. The influence of concentration, pH, particle size, and temperature on the adsorption capacities of methylene blue (MB) and hydrolyzed reactive black (RB) and reactive yellow (RY) was investigated. Key thermodynamic parameters such asΔHo , ΔSo , and ΔGo were also determined. The ΔHo of MB and hydrolyzed RB and RY was +94.64, −143.1, and −38.78 kJ/mol, respectively, whereas the ΔGo values of −17.68, −27.93, and −23.26 kJ/mol were obtained, indicating a spontaneous process with low activation-energy requirements. The findings further indicated that coulomb interaction, molecular size, and orientation of the dye and its surface charge played an important role in the adsorption and attachment of the dyes to the birnessite layers of MOMD.
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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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