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Adsorptive Removal of Phosphate by Volcanic Tephra after Modified withAcidic Solution

Peng Xiaoli1 Xu Fang1 Eva Chmielewská2(1 School of Environmental Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240;2 Faculty of Natural Sciences,Comenius University,Bratislava,Slovakia Republic)  
Volcanic tephra mineral modified by hydrochloric acid solution was effective for removal of phosphorus pollutant.The suitable concentration of hydrochloric acid medium was 1 mol/L,the phosphorus removal efficiency was 92.02% when 1 g acid modified volcanic tephra was added into 30 mL 50 mg/L phosphorus solution(pH value close to neutral).The adsorption behavior fit for Langmuir adsorption isotherm,the maximum adsorption capacity for phosphorus was 1.24 mg/g.
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