Adsorption of Methyl Orange on Waterworks Sludge in Waste WaterReport as inadecuate




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The adsorption of methyl orange on waterworks sludge in waste water was discussed in the paper. Results show that the low cost and high capacity of waterworks sludge makes it attractive adsorbent for the removal of methyl orange from wastewater. The adsorption mass for methyl orange is 0.76mg-g. The adsorption behavior and mechanism of methyl orange adsorption on waterworks sludge were studied. Kinetic studies showed that methyl orange adsorption on waterworks sludge fitted the second-order kinetic model. The second-order rate constants k2 calculated from the equation was 0.058g·mg-1·min-1. Isotherm studies illustrated that adsorption could be described by Freundlich isotherm model, with the correlation coefficients over 0.89. The adsorption thermodynamic parameters such as change in free energy ΔG, enthalpy ΔH, entropy ΔS were also determined. Values of ΔH for methyl orange adsorption on waterworks sludge was -0.009kJ·mol-1. The negative value of ΔG and ΔH indicated the adsorption process was spontaneous and exothermic.

KEYWORDS

waterworks sludge; methyl orange; adsorption; wastewater treatment

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Author: Aihua Cheng, Caihua Wang, Fenshuo Yang

Source: http://www.scirp.org/



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