化学改性铝污泥强化Cu~(2+)的吸附
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摘要
以净水厂铝污泥(AlS)为主要原料,依次经过铁盐浸渍和壳聚糖(CS)包覆,制得复合吸附剂AlS-Fe-CS,研究其对Cu~(2+)的吸附。结果表明,化学改性后,铁(氢)氧化物和CS复合在铝污泥上;最优吸附pH为5.5,吸附平衡时间为20 h,对Cu~(2+)的最大吸附量为72.36 mg/g,相比纯AlS性能提高了约1倍,且温度升高有利于吸附反应的进行;吸附过程符合拟二级动力学和Freundlich吸附等温线。
The composite adsorbent AlS-Fe-CS was obtained from the aluminum sludge(AlS) of the water purification plant,which was successively immersed in iron salt solution and coated with chitosan(CS),and the adsorption characteristics of Cu~(2+) were studied.The results showed that the iron(hydr)oxide and CS were successfully compounded on the AlS after the chemical modification;The optimum adsorption pH was 5.5,the adsorption equilibrium time was 20 h,the maximum adsorption capacity of modified AlS-Fe-CS for Cu~(2+) removal in the experimental concentration range was 72.36 mg/g,which was twice higher than pure AlS,and increasing temperature was conducive to the adsorption;the adsorption process conformed to the pseudo-second-order kinetics model and the Freundlich adsorption isotherm model.
The composite adsorbent AlS-Fe-CS was obtained from the aluminum sludge(AlS) of the water purification plant,which was successively immersed in iron salt solution and coated with chitosan(CS),and the adsorption characteristics of Cu~(2+) were studied.The results showed that the iron(hydr)oxide and CS were successfully compounded on the AlS after the chemical modification;The optimum adsorption pH was 5.5,the adsorption equilibrium time was 20 h,the maximum adsorption capacity of modified AlS-Fe-CS for Cu~(2+) removal in the experimental concentration range was 72.36 mg/g,which was twice higher than pure AlS,and increasing temperature was conducive to the adsorption;the adsorption process conformed to the pseudo-second-order kinetics model and the Freundlich adsorption isotherm model.
引文
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[2] Ippolito J A,Barbarick K A,Elliott H A.Drinking water treatment residuals:a review of recent uses[J].Journal of Environmental Quality,2011,40(1):1-12.
[3] Streat M,Hellgardt K,Newton N L R.Hydrous ferric oxide as an adsorbent in water treatment:Part 1.Preparation and physical characterization[J].Process Safety & Environmental Protection,2008,86(1):1-9.
[4] Wang J,Chen C.Chitosan-based biosorbents:modification and application for biosorption of heavy metals and radionuclides[J].Bioresource Technology,2014,160(5):129-141.
[5] Jiang Y J,Yu X Y,Luo T,et al.γ-Fe2O3 nanoparticles encapsulated millimeter-sized magnetic chitosan beads for removal of Cr(VI) from water:thermodynamics,kinetics,regeneration,and uptake mechanisms[J].Journal of Chemical & Engineering Data,2013,58(11):3142-3149.
[6] Dai J,Han Y,Yang H,et al.Simple method for preparation of chitosan/poly(acrylic acid) blending hydrogel beads and adsorption of copper(II) from aqueous solutions[J].Chemical Engineering Journal,2010,165(1):240-249.
[7] Jeon E K,Ryu S,Park S W,et al.Enhanced adsorption of arsenic onto alum sludge modified by calcination[J].Journal of Cleaner Production,2018,176:54-62.
[8] Gheju M,Balcu I,Mosoarca G.Removal of Cr(VI) from aqueous solutions by adsorption on MnO2[J].Journal of Hazardous Materials,2016,310:270-277.
[9] Zhou Y F,Haynes R J.Removal of Pb(II),Cr(III) and Cr(VI) from aqueous solutions using alum-derived water treatment sludge[J].Water Air & Soil Pollution,2011,215(1/2/3/4):631-643.
[10] Rao M M,Ramesh A,Rao G P,et al.Removal of copper and cadmium from the aqueous solutions by activated carbon derived from Ceiba pentandra hulls[J].Journal of Hazardous Materials,2006,B129(1/2/3):123-129.
[11] Padilla-Ortega E,Leyva-Ramos R,Mendoza-Barron J.Role of electrostatic interactions in the adsorption of cadmium(II) from aqueous solution onto vermiculite[J].Applied Clay Science,2014,s88/89(3):10-17.
[12] 张廷安,豆志河.用壳聚糖脱除废水中的铜离子[J].东北大学学报:自然科学版,2006,27(2):203-205.
[13] Nageeb R M,Ma E D E T,Fadlalla S M.Adsorption of methylene blue using modified adsorbents from drinking water treatment sludge[J].Water Science & Technology A Journal of the International Association on Water Pollution Research,2016,74(8):1885-1898.
[14] Adamczuk A,Koodyńska D.Equilibrium,thermodynamic and kinetic studies on removal of chromium,copper,zinc and arsenic from aqueous solutions onto fly ash coated by chitosan[J].Chemical Engineering Journal,2015,274:200-212.
[15] Wan M W,Kan C C,Rogel B D,et al.Adsorption of copper(II) and lead(II) ions from aqueous solution on chitosan-coated sand[J].Carbohydrate Polymers,2010,80(3):891-899.
[16] Futalan C M,Kan C C,Dalida M L,et al.Comparative and competitive adsorption of copper,lead,and nickel using chitosan immobilized on bentonite[J].Carbohydrate Polymers,2011,83(2):528-536.
[17] Li Y,Xia B,Zhao Q,et al.Removal of copper ions from aqueous solution by calcium alginate immobilized kaolin[J].Journal of Environmental Sciences,2011,23(3):404-411.
[18] Amarasinghe B M W P K,Williams R A.Tea waste as a low cost adsorbent for the removal of Cu and Pb from wastewater[J].Chemical Engineering Journal,2007,132(1):299-309.
[19] Aydin H,Bulut Y,Yerlikaya C.Removal of copper (II) from aqueous solution by adsorption onto low-cost adsorbents[J].Journal of Environmental Management,2008,87(1):37-45.
[20] Sayan E.Ultrasound-assisted preparation of activated carbon from alkaline impregnated hazelnut shell:An optimization study on removal of Cu2+ from aqueous solution[J].Chemical Engineering Journal,2006,115(3):213-218.
[21] 齐亚凤,何正艳,余军霞,等.改性甘蔗渣对Cu2+和Zn2+的吸附机理[J].环境工程学报,2013,7(2):585-590.
[22] Feng N C,Guo X Y.Characterization of adsorptive capacity and mechanisms on adsorption of copper,lead and zinc by modified orange peel[J].Transactions of Nonferrous Metals Society of China,2012,22(5):1224-1231.
[23] Horsfall M J,Arbia A A,Spiff A I.Removal of Cu(II) and Zn(II) ions from wastewater by cassava (Manihot esculenta Cranz) waste biomass[J].African Journal of Biotechnology,2003,2(10):360-364.
[24] Sari A,Tuzen M,Citak D,et al.Equilibrium,kinetic and thermodynamic studies of adsorption of Pb(II) from aqueous solution onto Turkish kaolinite clay[J].Journal of Hazardous Materials,2007,149(2):283-291.
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