盐酸改性膨润土处理含镉废水的研究
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摘要
用盐酸对膨润土进行活化改性制得酸改性膨润土,在静态吸附条件下研究其对模拟水样中镉离子的吸附条件和吸附机理。结果表明,经盐酸改性后的膨润土对镉离子的吸附性能得到一定程度提高,吸附最佳条件:pH=8,模拟水溶液中镉离子浓度20 mg/L,反应时间30 min。二级动力学方程和Freundlich吸附等温线方程能较好地描述酸改性膨润土吸附镉离子的反应过程。
The bentonite was modified by hydrochloric acid.The adsorption conditions and mechanism of hydrochloric acid-modified bentonite to remove cadmium ions in simulated water samples were emphatically discussed under static adsorption conditions.The results showed that the adsorption capacity of bentonite modified by hydrochloric acid was improved.The pH value is the main factor affecting the adsorption performance.The optimum adsorption conditions:pH = 8,the concentration of cadmium ion in the simulated aqueous solution is 20 mg/L,the reaction time is 30 min.The second-order kinetic equation and the Freundlich adsorption isotherm equation can better describe the reaction process of acid modified bentonite adsorption spacer.
The bentonite was modified by hydrochloric acid.The adsorption conditions and mechanism of hydrochloric acid-modified bentonite to remove cadmium ions in simulated water samples were emphatically discussed under static adsorption conditions.The results showed that the adsorption capacity of bentonite modified by hydrochloric acid was improved.The pH value is the main factor affecting the adsorption performance.The optimum adsorption conditions:pH = 8,the concentration of cadmium ion in the simulated aqueous solution is 20 mg/L,the reaction time is 30 min.The second-order kinetic equation and the Freundlich adsorption isotherm equation can better describe the reaction process of acid modified bentonite adsorption spacer.
引文
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[2]Asem A Atia.Adsorption of chromate and molybdate by cetylpyridinium bentonite[J].Applied Clay Science,2008,41:73-84.
[3]Naseem R,Tahir S S.Removal of Pb(II)from aqueous/acidic solutions by using bentonites as an adsorbent[J].Wather Research,2001,35(16):3982-3986.
[4]曹春艳.酸改性膨润土对含铅废水的吸附性能研究[J].化学与黏合,2009,31(1):45-47.
[5]Shi L N,Zhang X,Chen Z L.Removal of Chromium(VI)from waste-water using bentonite-supported nanoscale zero-valent iron[J].Water Research,2011,45(2):886-892.
[6]王宜鑫.粘土矿物材料对重金属离子的吸附机理探讨[D].扬州:扬州大学,2007.
[7]Wei Shang Tan,Adeline Su Yien Ting.Alginate-immobilized bentonite clay:Adsorption efficacy and reusability for Cu(II)removal from aqueous solution[J].Bioresource Technology,2014,160:115-118.
[8]Haseena P V,Padmavathy K S,Rohit Krishnan P,et al.Adsorption of ammonium nitrogen from aqueous systems using chitosan-bentonite film composite[J].Procedia Technology,2016,24:733-740.
[9]Guerra D J L,Mello I,Freitas L R,et al.Equilibrium,thermodynamic,and kinetic of Cr(VI)adsorption using a modified and unmodified bentonite clay[J].International Journal of Mining Science and Technology,2014,24:525-535.
[10]Benamar Makhoukhi,Mohamed Djab,Mohamed Amine Didi.Adsorption of Telon dyes onto bis-imidazolium modified bentonite in aqueous solutions[J].Journal of Environmental Chemical Engineering,2015,3(2):1384-1392.
[11]罗平,田英,张辉,等.酸改性膨润土对废水中铬的吸附性能研究[J].非金属矿,2012,35(6):77-79.
[12]张家春,刘倩,林昌虎,等.盐酸改性膨润土对铜离子的吸附性能[J].南方农业学报,2014,45(5):813-817.
[13]彭荣华,李晓湘.酸改性膨润土吸附去除镍镉离子的研究[J].材料保护,2006(1):65-67.