Abstract
In this work, the response surface methodology was used to optimize the process parameters of gallic acid adsorption on magnetic ion exchange (MIEX) resin. Based on Box-Behnken Design, a quadratic polynomial model equation including solution pH, gallic acid concentration, MIEX resin dosage and adsorption time was established. The reliability of the established regression equation was tested by variance analysis. Based on the regression equation, the technical parameters for gallic acid adsorption on MIEX resin were optimized and the effects of interaction between variables on the removal of gallic acid were analyzed. The results showed that the established regression equation was reliable and could effectively predict the removal of gallic acid. The optimal technical parameters were determined to be a pH of 9.17, a gallic acid concentration of 8.07 mg/L, a resin dosage of 0.98 mL/L and an adsorption time of 46.43 min. The removal efficiency of gallic acid was 97.93% under the optimal parameters. The interaction between pH and adsorption time had the most significant effect on the removal of gallic acid. The results of this study demonstrated that MIEX resin can remove gallic acid efficiently and relatively quickly under the condition of optimal technical parameters.
Highlights
Natural organic matter (NOM) widely exists in surface water and groundwater sources due to the breakdown of biomass [1]
It has been demonstrated that excess Gallic acid (GA) in water bodies causes the unpleasant color and odor of drinking water, and the formation of carcinogenic disinfection by-products (DBPs), such as trichloroethanes and chloroacetic acids, during the chlorination process [7,8,9]
In our pre-experiments, we found that temperature had less effect on the adsorption of GA on magnetic ion exchange (MIEX) resin, and the effect of agitation speed could be neglected when the speed exceeds 150 rpm
Summary
Natural organic matter (NOM) widely exists in surface water and groundwater sources due to the breakdown of biomass [1]. Gallic acid (GA) is a typical fraction of NOM. A great deal of wastewater containing GA discharges into water bodies. It is difficult to remove GA by the traditional drinking water treatment processes due to its water solubility and small molecular weight [5,6]. It has been demonstrated that excess GA in water bodies causes the unpleasant color and odor of drinking water, and the formation of carcinogenic disinfection by-products (DBPs), such as trichloroethanes and chloroacetic acids, during the chlorination process [7,8,9]. It is necessary to remove GA from raw water to guarantee the safety of drinking water
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