碳化硅多孔陶瓷表面活化改性及其吸附Pb(Ⅱ)的研究
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摘要
碳化硅多孔陶瓷经过活化,然后采用γ-氨丙基三乙氧基硅烷(KH550)对碳化硅多孔陶瓷进行表面改性处理,制备出能够有效吸附溶液中Pb(Ⅱ)的多孔陶瓷材料。通过扫描电镜(SEM)和红外光谱(FTIR)对材料的微观结构进行了分析表征,FTIR结果表明硅烷偶联剂KH550成功的接枝到了碳化硅多孔陶瓷的表面。采用原子吸收分光光度计测定了吸附前后溶液中Pb(Ⅱ)浓度的变化,考察了pH值、吸附剂投加量、反应温度、反应时间以及Pb2+初始浓度等对吸附剂性能的影响。研究表明,在初始浓度10 mg/L、反应时间180 min、pH=5时吸附效率最佳,吸附率达到92%。
Silicon carbide porous ceramic was activated and then was modified by γ-aminopropyltriethoxysilane(KH550) to prepare a porous ceramic adsorbent with the capable of effectively adsorbing Pb(Ⅱ) in the solution. Scanning electron microscopy(SEM) and fourier transform infrared spectroscopy(FTIR) were adopted to characterize and analyze the unmodified and modified SiC porous ceramics. The FTIR results indicated that the silane coupling agent KH550 was successfully grafted onto the surface of the SiC porous ceramic. The variation of Pb( Ⅱ) concentration before and after adsorption was measured by atomic absorption spectrophotometer in the solution. The effects of pH value, dosage of adsorbent, reaction temperature, reaction time, and initial concentration of Pb~(2+) were investigated on the performance of the adsorbent. The optimum conditions were obtained, as follow: initial concentration of Pb~(2+) 10 mg/L, reaction time of 180 min, pH=5, and the adsorption rate reaches 92%.
Silicon carbide porous ceramic was activated and then was modified by γ-aminopropyltriethoxysilane(KH550) to prepare a porous ceramic adsorbent with the capable of effectively adsorbing Pb(Ⅱ) in the solution. Scanning electron microscopy(SEM) and fourier transform infrared spectroscopy(FTIR) were adopted to characterize and analyze the unmodified and modified SiC porous ceramics. The FTIR results indicated that the silane coupling agent KH550 was successfully grafted onto the surface of the SiC porous ceramic. The variation of Pb( Ⅱ) concentration before and after adsorption was measured by atomic absorption spectrophotometer in the solution. The effects of pH value, dosage of adsorbent, reaction temperature, reaction time, and initial concentration of Pb~(2+) were investigated on the performance of the adsorbent. The optimum conditions were obtained, as follow: initial concentration of Pb~(2+) 10 mg/L, reaction time of 180 min, pH=5, and the adsorption rate reaches 92%.
引文
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[2]门彬,王东升.重金属废水处理方法综述[J].工业水处理,2011,8:65-68.
[3]柴威,邓乾发,王羽寅,等.碳化硅陶瓷的应用现状[J].轻工机械,2012,30(4):117-120.
[4]尉楠.多孔SiC及其改性对含油废水过滤性能的研究[D].西安:长安大学,2017.
[5]王伟宸,刘伟.偶联剂N-β(氨乙基)-r-氨丙基三甲氧基硅烷对多孔陶瓷的表面改性[J].北京化工大学学报(自然科学版),2010,37(2):16-20.
[6]曾幸荣.高分子近代测试分析技术[M].广州:华东理工大学出版社,2007,47-51.
[7] ShuklaA,Zhang Y H,Dubey P,et al.The role of sawdust in the removal of unwanted materials from water[J].Journal of Hazardous Materials,2002,95(1-2):137-152.
[8] Ozer A,Ozer D.Comparative study of biosorption of Pb(Ⅱ),Ni(Ⅱ)and Cr(Ⅵ)ions onto S.cerevisiae:determination of biosorption heats[J]. J.Hazar.Mater.,2003,100(1-3):219-229.
[9] Yurtsever M,Sengil I A.Biosorption of Pb(Ⅱ)ions by modified quebracho tannin resin[J].J.Hazar.Mater.,2009,163(1):58-64.
[10] Tahir S S,Rauf N.Thermodynamic studies of Ni(Ⅱ)adsorption onto bentonite from aqueous solution[J].The Journal of Chemical Thermodynami cs, 2003,35(12):2003-2009.
[11] Tsai S C,Wang T H,Wei Y Y,et al.Kinetics of Cs adsorption/desorption on granite by a pseudo first order reaction model[J].J Radioanal Nucl Ch,2008,275(3):555-562.
[12] Ho Y S, McKay G. Pseudo-second order model for sorption processes[J]. Process Biochem, 1999,34(5):451-465.
[13] Ozacar M,Sengil I A.Adsorption of reactive dyes on calcined alunite from aqueous solutions[J].Journal of Hazardous Material B,2003, B98:211-224.
[14] Ghosh,D.,Saha,R.,Ghosh,A.,et al. A review cadmium biosorption from contaminated wastewater[J]. Desalin.Water Treat.2015,53,413-420.
[15] Xiong,C., Wang, W.,Tan,F.,et al.Investigation on the efficiency and mechanism of Cd(Ⅱ)and Pb(Ⅱ)removal from aqueous solutions using MgO nanoparticles. J. Hazard. Mater.2015,299,664-674.