Abstract
AbstractA new adsorbing material, coal cinder ball, was synthesized, characterized, and applied to remove chemical oxygen demand (CODCr) and ammonia nitrogen (-N) from water. Since coal cinders contain harmful metals, the optimum pretreatment method was determined by testing the harmful metal concentrations of cinder leachate solution. The results demonstrated the optimum concentration of HCl in modified coal cinders was 6 mol/L. Due to large surface areas of modified coal cinders, they exhibited a high adsorption affinity for CODCr and -N. The adsorption kinetics of CODCr and -N on coal cinder balls could be expressed by the pseudo-second-order model, which revealed that the adsorption process consisted of physical adsorption and chemical adsorption. The adsorption isotherms were fitted well with the Langmuir isotherm, which might be due to homogenous distribution of active sites on the microspheres’ surface. When the coal cinder balls were used to purify the micro-polluted river water, the removal of CO...
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