Ciprofloxacin adsorption from aqueous solution onto chemically prepared carbon from date palm leaflets  被引量:9

Ciprofloxacin adsorption from aqueous solution onto chemically prepared carbon from date palm leaflets

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作  者:El-Said Ibrahim El-Shafey Haider Al-Lawati Asmaa Soliman Al-Sumri 

机构地区:[1]Department of Chemistry,College of Science,Sultan Qaboos University,P.O.Box 36-Al-Khodh 123,Muscat,Oman

出  处:《Journal of Environmental Sciences》2012年第9期1579-1586,共8页环境科学学报(英文版)

摘  要:A chemically prepared carbon was synthesized from date palm leaflets via sulphuric acid carbonization at 160℃. Adsorption of ciprofloxacin (CIP) from aqueous solution was investigated in terms of time, pH, concentration, temperature and adsorbent status (wet and dry). The equilibrium time was found to be 48 hr. The adsorption rate was enhanced by raising the temperature for both adsorbents, with adsorption data fitting a pseudo second-order model well. The activation energy, Ea, was found to be 17 kJ/mol, indicating a diffusion-controlled, physical adsorption process. The maximum adsorption was found at initial pH 6. The wet adsorbent showed faster removal with higher uptake than the dry adsorbent, with increased performance as temperature increased (25--45℃). The equilibrium data were found to fit the Langmuir model better than the Freundlich model. The thermodynamic parameters showed that the adsorption process is spontaneous and endothermic. The adsorption mechanism is mainly related to cation exchange and hydrogen bonding.A chemically prepared carbon was synthesized from date palm leaflets via sulphuric acid carbonization at 160℃. Adsorption of ciprofloxacin (CIP) from aqueous solution was investigated in terms of time, pH, concentration, temperature and adsorbent status (wet and dry). The equilibrium time was found to be 48 hr. The adsorption rate was enhanced by raising the temperature for both adsorbents, with adsorption data fitting a pseudo second-order model well. The activation energy, Ea, was found to be 17 kJ/mol, indicating a diffusion-controlled, physical adsorption process. The maximum adsorption was found at initial pH 6. The wet adsorbent showed faster removal with higher uptake than the dry adsorbent, with increased performance as temperature increased (25--45℃). The equilibrium data were found to fit the Langmuir model better than the Freundlich model. The thermodynamic parameters showed that the adsorption process is spontaneous and endothermic. The adsorption mechanism is mainly related to cation exchange and hydrogen bonding.

关 键 词:CIPROFLOXACIN CARBON ADSORPTION palm leaflets 

分 类 号:TQ127.11[化学工程—无机化工]

 

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