Study on preparation of new modified coal gasification waste residue and its adsorption of Cr6+in chromium-containing wastewater
In order to further improve the adsorption capacity of coal gasification waste residue for Cr6+in chromium-containing wastewater,a new type of modified coal gasification waste residue MH-GWY was prepared by using coal gasification waste residue from a thermal power plant as raw material,16%nitric acid solution as the main agent and adding a solubilizer ZR-1,which had chemical modification under ultrasound assisted conditions.The adsorption effect of coal gasification waste residue before and after modification was investigated,and the impacts of adsorbent dosage,wastewater pH value,adsorption time and adsorption temperature on the removal rate of Cr6+were evaluated.The results showed that under the same experimental conditions,the adsorption effect of the new modified coal gasification waste residue MH-GWY on Cr6+in simulated chromium-containing wastewater was clearly better than that of the original coal gasification waste residue GWY.When the concentration of Cr6+in the wastewater was 100 mg/L,0.3 g of adsorbent MH-GWY was added to 100 mL of wastewater,the pH value of the wastewater was controlled at 5,the adsorption time was 160 min,and the adsorption temperature was 25℃,the removal rate of Cr6+could reach 96.75%.
coal gasification waste residueultrasonic assisted chemical modificationwastewater containing Cr6+adsorptioninfluence factor
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