粉煤灰改性及其吸附废水中Pb(Ⅱ)的研究
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摘要
采用高温焙烧法制备改性粉煤灰(MFA),考察了改性粉煤灰投加量、初始pH、吸附时间对水中Pb(Ⅱ)吸附效果的影响,通过吸附动力学方程和吸附等温线方程对吸附机理进行了分析。结果表明,在温度30℃,初始Pb(Ⅱ)浓度40 mg/L,MFA投加量2 g/L,pH为5.5,吸附时间为30 min时,Pb(Ⅱ)的吸附率达到97.97%,水中残留的Pb(Ⅱ)浓度低于1.0 mg/L,满足排放标准的要求。吸附动力学符合拟二级动力学方程,吸附等温线符合Freundlich方程,吸附机制为化学吸附。
The modified fly ash was prepared by high temperature calcination method.The effects of adsorbent dosage,initial pH and adsorption time on the Pb(Ⅱ) adsorption capacity were investigated.The adsorption kinetics were studied and the experimental data was also fitted with the isotherm equilibrium models.The results show that at the situation of 30 ℃ and 40 mg/L initial concentration of Pb(Ⅱ),when the adsorbent dosage was 2 g/L,the initial pH was 5.5 and the adsorption time was 30 min,the adsorption efficiency of Pb(Ⅱ) reached 97.97% and the residual Pb(Ⅱ) concentration in water was below 1.0 mg/L,which could meet the emission standard.The adsorption kinetic data was fitted well to the pseudo-second order kinetic equation and the adsorption isotherm was well described by the Freundlich equation.The adsorption process was the chemical adsorption.
The modified fly ash was prepared by high temperature calcination method.The effects of adsorbent dosage,initial pH and adsorption time on the Pb(Ⅱ) adsorption capacity were investigated.The adsorption kinetics were studied and the experimental data was also fitted with the isotherm equilibrium models.The results show that at the situation of 30 ℃ and 40 mg/L initial concentration of Pb(Ⅱ),when the adsorbent dosage was 2 g/L,the initial pH was 5.5 and the adsorption time was 30 min,the adsorption efficiency of Pb(Ⅱ) reached 97.97% and the residual Pb(Ⅱ) concentration in water was below 1.0 mg/L,which could meet the emission standard.The adsorption kinetic data was fitted well to the pseudo-second order kinetic equation and the adsorption isotherm was well described by the Freundlich equation.The adsorption process was the chemical adsorption.
引文
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[3] 郑曼迪,熊黑钢,伊元荣.不同环境条件下粉煤灰吸附铅离子效率对比研究[J].河南师范大学学报:自然科学版,2018,46(2):66-72.
[4] 高宏,李恒,贺波,等.用改性粉煤灰微珠吸附处理铅锌硫化矿选矿废水[J].湿法冶金,2018,37(1):40-44.
[5] 王美玲,崔杏雨,陈树伟,等.改性粉煤灰去除废水中Pb(Ⅱ)的研究[J].太原理工大学学报,2016,47(4):485-489.
[6] 国家环保局《水和废水监测分析方法》编委会.水和废水监测分析方法[M].4版.北京:中国环境科学出版社,2002:346-349.
[7] 肖先举,唐学红,刘永菊,等.不同改性方式对粉煤灰处理含铬废水效果的实验研究[J].山东化工,2012,41(11):33-34.
[8] 国家环境保护局科技标准司.污水综合排放标准 GB 8978—1996[S].北京:中国环境科学出版社,1998.
[9] Gupta V K,Agarwal S,Saleh T A.Synthesis and characterization of alumina-coated carbon nanotubes and their application for lead removal[J].J Hazard Mater,2011,185:17-23.
[10] Zhou Y,Xia S Q,Zhang J,et al.Insight into the influences of pH value on Pb(Ⅱ) removal by the biopolymer extracted from activated sludge[J].Chem Eng J,2017,308:1098-1104.
[11] 李青竹,覃文庆,柴立元,等.酯化改性麦糟对Pb(Ⅱ)的吸附特性[J].中国有色金属学报,2013,23(4):1152-1159.
[12] 张连科,刘心宇,王维大,等.镧柱撑膨润土对铅的吸附特性[J].环境污染与防治,2018,40(4):435-439.
[13] Dural M U,Cavas L,Papageorgiou S K,et al.Methylene blue adsorption on activated carbon prepared from posidonia oceanica(L.) dead leaves:kinetics and equilibrium studies[J].Chem Eng J,2011,168:77-85.
[14] Bedin K C,Martins A C,Cazetta A L,et al.KOH-activated carbon prepared from sucrose spherical carbon:adsorption equilibrium,kinetic and thermodynamic studies for methylene blue removal[J].Chem Eng J,2016,286:476-484.
[15] 陈玉强,张胜寒.高分子除氯剂对水中氯离子的吸附机理[J].化工环保,2018,38(2):185-190.
[16] Rwiza M J,Oh S Y,Kim K W,et al.Comparative sorption isotherms and removal studies for Pb(II) by physical and thermochemical modification of low-cost agro-wastes from Tanzania[J].Chemosphere,2018,195:135-145.
[17] Niu Y Z,Qu R J,Sun C M,et al.Adsorption of Pb(Ⅱ) from aqueous solution by silicagel supported hyperbranched polyamidoamine dendrimers[J].J Hazard Mater,2013,244/245:276-286.
[18] Rwiza M J,Oh S Y,Kim K W,et al.Comparative sorption isotherms and removal studies for Pb(II) by physical and thermochemical modification of low-cost agro-wastes from Tanzania[J].Chemosphere,2018,195:135-145.