A low-cost and environmentally friendly modified alginate aerogel (Alg-NH2) was developed by chemical grafting technology and simple vacuum freeze-drying method for remove Pb2+ in wastewater.Results showed that the prepared Alg-NH2 showed high adsorption capacity and selectivity for Pb2+,which had the selectivity coefficient of >40 among other metal ions.Alg-NH2 can adsorb 96.4% of Pb2+ in aqueous solution.The maximum adsorption capacity of Alg-NH2 for Pb2+ was 217.2mg·g-1.The prepared Alg-NH2 could remove Pb2+ from aqueous solution in a wide pH range,i.e.,pH 3 to pH 7.Moreover,the Alg-NH2 could also be regenerated using simple acid washing and used repeatedly without loss in performance.Pseudo-first- and pseudo-second-order kinetic models were adopted to fit the kinetic data to investigate the rate controlling and kinetic mechanism involved in the adsorption process.The values of r(0.9948) indicated that the pseudo-second-order kinetic model fitted better with the kinetic data,which suggested that chemisorption was the rate determining step for the adsorption process.Further XPS analysis of samples before and after adsorption showed that Alg-NH2 binded Pb2+ mainly through ion exchange and chemical coordination.
[1] Afkhami A,Saber-tehrani M,Bagheri H.Simultaneous removal of heavy-metal ions in wastewater samples using nano-alumina modified with 2,4-dinitrophenylhydrazine[J].Journal of Hazardous Materials,2010,181(1-3):836-844.
[2] Guo X,Du B,Wei Q,et al.Synthesis of amino functionalized magnetic graphenes composite material and its application to remove Cr(VI),Pb(Ⅱ),Hg(Ⅱ),Cd(Ⅱ) and Ni(Ⅱ) from contaminated water[J].Journal of Hazardous Materials,2014,278:211-220.
[3] Razzaz A,Ghorban S,Hosayni L,et al.Chitosan nanofibers functionalized by TiO2 nanoparticles for the removal of heavy metal ions[J].Journal of Taiwan Institute of Chemical Engineers,2016,58:333-343.
[4] Pehlivan E,Altun T,Parlaylcl S.Utilization of barley straws as biosorbents for Cu2+ and Pb2+ ions[J].Journal of Hazardous Materials,2009,164(2/3):982-986.
[5] Iqbal M,Saeed A,Zafar S I.FTIR spectrophotometry,kinetics and adsorption isotherms modeling,ion exchange,and EDX analysis for understanding the mechanism of Cd2+ and Pb2+ removal by mango peel waste[J].Journal of Hazardous Materials,2009,164(1):161-171.
[6] BoiAc＇5 D,StankoviAc＇5 V,Gorgievski M,et al.Adsorption of heavy metal ions by sawdust of deciduous trees[J].Journal of Hazardous Materials,2009,171(1-3):684-692.
[7] Gonzlez A,Moreno N,Navia R,et al.Development of a non-conventional sorbent from fly ash and its potential use in acid wastewater neutralization and heavy metal removal[J].Chemical Engineering Journal,2011,166(3):896-905.
[8] Liu F,Carlos L D,Ferreira R A S,et al.Photoluminescent porous alginate hybrid materials containing lanthanide ions[J].Biomacromolecules,2008,9(7):1945-1950.
[9] Wang Z,Huang Y,Wang M,et al.Macroporous calcium alginate aerogel as sorbent for Pb2+ removal from water media[J].Journal of Environmental Chemical Engineering,2016,4(3):3185-3192.
[10] Majidnia Z,Idris A.Evaluation of cesium removal from radioactive waste water using maghemite PVA-alginate beads[J].Chemical Engineering Journal,2015,262:372-382.
[11] 马立成,郑其,车小奎,等.磁性交联壳聚糖微球的制备及对Cu2+的吸附性能[J].化工新型材料,2015,43(11):36-42.
[12] Wang Z,Wang M,Wu G,et al.Colorimetric detection of copper and efficient removal of heavy metal ions from water by diamine-functionalized SBA-15[J].Dalton Transactions,2014,43(22):8461-8468.
基金资助
国家自然科学基金(21407004);安徽高校自然科学研究项目(KJ2017A345);安徽省自然科学基金项目(1508085QB48)
PDF
