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Adsorption of formaldehyde by manganese oxide modified ion exchange resin

Zuo Weiyuan;Tong Haijuan;Li Jian;Chen Shengyu;Shi Bingfang;Guangxi Colleges and Universities Key Laboratory of Regional Ecological Environment Analysis and Pollution Control of West Guangxi,College of Chemistry & Environment Engineering,Baise University;  
The D072 ion exchange resin was modified by manganese oxide and was used as adsorbent to removal formaldehyde in wastewater.The effects of different salt types and several factors,including p H,temperature,and solid to liquid ratio etc.on the adsorption of ion exchange resin for formaldehyde from wastewater were investigated.The adsorption isotherms and kinetics were also discussed.Results showed that the formaldehyde adsorption capacity of D072 was obviously improved after modification by manganese oxide.The formaldehyde adsorption capacity was 4.867 mg/g under the conditions of p H of 7.0,initial mass concentration of formaldehyde of 50 mg/L,mass/volume ratio of solid to liquid of 4.0 g/L,and temperature of25 ℃.Isotherms adsorption results indicated that the Langmuir model gave an acceptable fit to the experimental data and maximum formaldehyde uptake obtained was Qm=7.582 mg/g.Adsorption kinetics law conformed to pseudo-second-order kinetics,and the adsorption rate constant was 0.002 3 g/(mg·min).
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