K~+、Na~+、Ca~(2+)共存离子对活性炭吸附Cr(Ⅵ)的影响
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摘要
以含有重金属离子Cr(Ⅵ)以及共存轻金属离子K~+、Na~+、Ca~(2+)的模拟废水为研究对象,采用活性炭进行吸附处理,探讨了3种共存轻金属离子对活性炭吸附Cr(Ⅵ)的影响。结果表明:(1)共存的K~+、Na~+、Ca~(2+)与Cr(Ⅵ)之间存在竞争吸附,其影响活性炭吸附Cr(Ⅵ)的大小顺序为Ca~(2+)>Na~+>K~+,其中Ca~(2+)导致Cr(Ⅵ)去除率下降44.16百分点。(2)吸附Cr(Ⅵ)的活性炭在2 170cm~(-1)处出现新的红外振动峰,表明Cr(Ⅵ)与活性炭之间的吸附属于化学吸附。在同时吸附Cr(Ⅵ)与共存离子的样品中,未出现新的红外振动峰,表明K~+、Na~+、Ca~(2+)与活性炭间的吸附属于物理吸附。(3)活性炭吸附Cr(Ⅵ)的过程符合Langmuir模型,属于单分子层化学吸附;其动力学曲线符合伪二级动力学模型。
Simulated wastewater involving Cr(Ⅵ)and coexisting ions K+,Na+and Ca2+was studied,and activated carbon was used for adsorption treatment.The effect of coexisting ions on the adsorption of Cr(Ⅵ)by activated carbon was investigated.The results indicated that:(1)there was competition adsorption between coexisting ions and Cr(Ⅵ),and the sequence of coexisting ions to adsorption of Cr(Ⅵ)was Ca2+>Na+>K+.The percentage of Cr(Ⅵ)removal by Ca2+was decreased by 44.16 percent point.(2)New infrared vibration peak appeared in 2 170cm-1 for Cr(Ⅵ)adsorbed activated carbon,which indicated that the adsorption of Cr(Ⅵ)by activated carbon was chemical process.For Cr(Ⅵ)and coexisting ions adsorbed activated carbon,no new infrared vibration peaks were observed.It was speculated that the adsorption of K+,Na+and Ca2+by activated carbon was physical process.(3)The adsorption of Cr(Ⅵ)by activated carbon was in conformity with Langmuir isothermal equation,and the adsorption kinetic accorded with pseudo-seccnd order equation.The adsorption of Cr(Ⅵ)by activated carbon was monolayer chemical adsorption.
Simulated wastewater involving Cr(Ⅵ)and coexisting ions K+,Na+and Ca2+was studied,and activated carbon was used for adsorption treatment.The effect of coexisting ions on the adsorption of Cr(Ⅵ)by activated carbon was investigated.The results indicated that:(1)there was competition adsorption between coexisting ions and Cr(Ⅵ),and the sequence of coexisting ions to adsorption of Cr(Ⅵ)was Ca2+>Na+>K+.The percentage of Cr(Ⅵ)removal by Ca2+was decreased by 44.16 percent point.(2)New infrared vibration peak appeared in 2 170cm-1 for Cr(Ⅵ)adsorbed activated carbon,which indicated that the adsorption of Cr(Ⅵ)by activated carbon was chemical process.For Cr(Ⅵ)and coexisting ions adsorbed activated carbon,no new infrared vibration peaks were observed.It was speculated that the adsorption of K+,Na+and Ca2+by activated carbon was physical process.(3)The adsorption of Cr(Ⅵ)by activated carbon was in conformity with Langmuir isothermal equation,and the adsorption kinetic accorded with pseudo-seccnd order equation.The adsorption of Cr(Ⅵ)by activated carbon was monolayer chemical adsorption.
引文
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[15] ZHENG J Y,ZHAO Q L,YE Z F.Preparation and charaterization of activated carbon fiber(ACF)from cotton woven waste[J].Applied Surface Science,2014,299(8):86-91.
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[17] LION T H.Development of mesoporous structure and high adsorption capacity of biomass-based activated carbon by phosphoric acid and zinc chloride activation[J].Chemical Engineering Journal,2010,158(2):129-142.
[18] LANGMUIR I.The adsorption of gases on plane surfaces of glass,mica and platinum[J].Journal of the American Chemical Society,1918,40(9):1361-1403.
[19] OZCAN A S,OZCAN A.Adsorption of acid dyes from aqueous solutions onto acid-actived bentonite[J].Journal of Colloid and Interface Science,2004,276(1):39-46.
[20] SOMAYAJULA A,AZIA A,SARAVANAN P,et al.Adsorption of mercury(Ⅱ)ion from aqueous solution using low-cost activated carbon prepared from mango kernel[J].Asia-Pacific Journal of Chemical Engineering,2013,8(1):1-10.
[2]胡颖,操家顺.植物废料吸附含铬废水的研究进展[J].安全与环境工程,2016,23(1):51-58.
[3] SAHAN S,SACMACI S,KARYAL S,et al.Development of a new on-line system for the sequetial speciation and determination of chromium species in various samples using a combination of chelating and ion exchange resins[J].Talanta,2014,120(3):391-397.
[4] GOSWAMI M,BORAH L,MAHANTA D,et al.Equilibrium modeling,kinetic and thermodynamic studies on the adsorption of Cr(Ⅵ)using activated carbon derived from matured tea leaves[J].Journal of Porous Materials,2014,21(6):1025-1034.
[5]王尚军,陈海珍,赵宝艳.蔺草负载活性炭对Cr(Ⅵ)的吸附过程分析[J].北方农业学报,2016,44(4):75-79.
[6]梁霞,王学江.活性炭改性方法及其在水处理中的应用[J].水处理技术,2011,37(8):1-6.
[7] PARK S J,KIM Y M.Adsorption behaviors of heavy metal ions onto electrochemically oxidized activated carbon fibers[J].Materials Science and Engineering:A,2005,391(1/2):121-123.
[8] MOHAN D,CHANDER S.Single component and multi-component adsorption of metal ions by activated carbons[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2001,177(2/3):183-196.
[9]张淑琴,童仕唐.活性炭对重金属离子铅镉铜的吸附研究[J].环境科学与管理,2008,33(4):91-94.
[10]陈芳艳,唐玉斌,茅新华.活性炭纤维对水中重金属离子的吸附研究[J].辽宁城乡环境科技,2002,22(2):22-29.
[11]李璐,封莉,张立秋.污泥基活性炭表面官能团对其催化臭氧氧化性的影响[J].环境化学,2014,33(6):937-942.
[12]何宏平,郭九皋,谢先德,等.蒙脱石等粘土矿物对重金属离子吸附选择性的试验研究[J].矿物学报,1999,19(2):231-235.
[13] CAGLAYAN B S,AKSOYLU A E.CO2adsorption on chemically modified activated carbon[J].Journal of Hazardous Materials,2013,252/253:19-28.
[14]周枫.废水中六价铬的主要存在形态与废水浓度及酸度的关系[J].电镀与环保,1988,8(2):37-39.
[15] ZHENG J Y,ZHAO Q L,YE Z F.Preparation and charaterization of activated carbon fiber(ACF)from cotton woven waste[J].Applied Surface Science,2014,299(8):86-91.
[16] HADOUN H,SADAOUI Z,SOUAMI N,et al.Charaterization of mesoporous carbon prepared from date stems by H3PO4chemical activation[J].Applied Surface Science,2013,280(8):1-7.
[17] LION T H.Development of mesoporous structure and high adsorption capacity of biomass-based activated carbon by phosphoric acid and zinc chloride activation[J].Chemical Engineering Journal,2010,158(2):129-142.
[18] LANGMUIR I.The adsorption of gases on plane surfaces of glass,mica and platinum[J].Journal of the American Chemical Society,1918,40(9):1361-1403.
[19] OZCAN A S,OZCAN A.Adsorption of acid dyes from aqueous solutions onto acid-actived bentonite[J].Journal of Colloid and Interface Science,2004,276(1):39-46.
[20] SOMAYAJULA A,AZIA A,SARAVANAN P,et al.Adsorption of mercury(Ⅱ)ion from aqueous solution using low-cost activated carbon prepared from mango kernel[J].Asia-Pacific Journal of Chemical Engineering,2013,8(1):1-10.