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《Industrial Water & Wastewater》 2017-03
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Experimental research on modification of pumice and its adsorption performance to Mn~(2+)

LI Xiao-bin;DENG Run-yi;ZHANG Yong;CHEN Si-hua;WANG Tao;HUANG Xian-huai;Zhongbei Coal Chemical Group Co., Ltd.;Anhui Province Key Laboratory of Water Pollution Control and Wastewater Resource Utilization, Anhui Jianzhu University;  
In order to investigate the effect of sulfuric acid on modification of pumice and the adsorption property of the modified pumice to Mn~(2+), the influence of sulfuric acid modification condition on specific surface area, pore volume and pore diameter of the pumice were studied through orthogonal test. The modified pumice and unmodified pumice were analyzed contrastively by SEM and XRD. The optimal adsorption conditions of sulfuric acid modified pumice to Mn~(2+)were studied by static adsorption test. The results showed that, the optimal conditions for pumice modification was as follows: the mass concentration of sulfuric acid was 0.50 mol/L, the modification time was 30 min, the temperature was 35 ℃. The specific surface area and pore volume of the modified pumice were about 21.15 m2/g and 0.053 cm3/g respectively, the average pore diameter was 5 nm. The results of SEM and XRD comparative analysis showed that, the surface of the modified pumice became rough and fluffy,the micropores increased, the porosity and the permeability of the pores increased, and Ca SO4·2H2O monoclinic crystals appeared. Modified pumice dosage and solution p H value were key factors affecting adsorption performance, when the solution p H value was 5, the modified pumice dosage was 4 g/L, the initial mass concentration of Mn~(2+)was 5 mg/L, the removal rate of Mn~(2+)reached above 85%, the adsorption capacity was over 10.00 mg/g.
【Fund】: 国家“十二五”水专项(2014ZX07303-003-09);; 淮南矿业集团科研项目计划(HNKY XB JS(2012)-002号)
【CateGory Index】: X703.1
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