污泥基生物质炭的制备及其对水中铜的吸附研究
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摘要
以城市污泥为原料,采用热解法制备生物质炭,以水体中Cu~(2+)为吸附目标,探究了活化剂浓度、浸渍比、浸渍时间、炭化温度及炭化时间对污泥基生物质炭制备的影响,并对最佳条件下制备的污泥基生物质炭进行了吸附等温线及吸附动力学分析。结果表明:污泥基生物质炭的最佳制备条件是活化剂浓度为15%,浸渍比为1∶1,浸渍时间为4 h,炭化温度为750℃,炭化时间为40 min。吸附过程符合准二级反应动力学模型,等温吸附曲线遵循Freundlich等温线模型,说明污泥基生物质炭对Cu~(2+)的吸附为多层吸附。
Using sewage sludge as raw material, biomass carbon was prepared by pyrolysis. The effects of activator concentration,impregnation ratio, impregnation time, carbonization temperature and carbonization time on the preparation of sludge-based biomass carbon were investigated. The adsorption isotherm and adsorption kinetics of sludge-based biomass carbon prepared under optimal conditions were analyzed. The results showed that the optimum preparation conditions of sludge-based biomass carbon were as follows: the concentration of activator was 15%, the impregnation ratio was 1 ∶1, the impregnation time was 4 hours, the carbonization temperature was750℃, and the carbonization time was 40 minutes. The adsorption process accords with the quasi-second-order reaction kinetics model,and the isothermal adsorption curve follows the Freundlich isotherm model, which indicates that the adsorption of Cu~(2+) by sludge-based biomass carbon is multi-layer.
Using sewage sludge as raw material, biomass carbon was prepared by pyrolysis. The effects of activator concentration,impregnation ratio, impregnation time, carbonization temperature and carbonization time on the preparation of sludge-based biomass carbon were investigated. The adsorption isotherm and adsorption kinetics of sludge-based biomass carbon prepared under optimal conditions were analyzed. The results showed that the optimum preparation conditions of sludge-based biomass carbon were as follows: the concentration of activator was 15%, the impregnation ratio was 1 ∶1, the impregnation time was 4 hours, the carbonization temperature was750℃, and the carbonization time was 40 minutes. The adsorption process accords with the quasi-second-order reaction kinetics model,and the isothermal adsorption curve follows the Freundlich isotherm model, which indicates that the adsorption of Cu~(2+) by sludge-based biomass carbon is multi-layer.
引文
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[15]Guo X J,Wu Z J,He M C,et al.Adsorption of antimony onto iron oxyhydroxides:Adsorption behavior and surface structure.Journal of Hazardous Materials[J].Journal of Hazardous Materials,2014,276:339-345.
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[18]魏东宁,杜淑雯,罗琳,等.改性吸附剂对水中Cu(Ⅱ)的去除效果研究[J].矿冶工程,2018,38(4):94-97,101.
[2]丁镠.城市污水处理厂污泥处理处置现状与技术研究分析[J].绿色科技,2017(20):90-92.
[3]蒋越,周楫,杨雨浛,等.城市污泥堆肥对土壤温室气体排放的短期影响[J].中国环境科学,2018,38(10):3788-3794.
[4]冀拯宇,周吉祥,郭康莉,等.连续施用无害化污泥堆肥对沙质潮土肥力的影响[J].植物营养与肥料学报,2018,24(5):1276-1284.
[5]Yang G,Zhang G M,Wang H C.Current state of sludge production,management,treatment and disposal in China[J].Water Research,2015,78:60-73.
[6]Ren J Z,Liang H W,Dong L,et al.Sustainable development of sewage sludge-to-energy in China:Barriers identification and technologies prioritization[J].Renewable and Sustainable Energy Reviews,2017,67:384-396.
[7]杜淑雯,周浩,彭玉倩,等.海藻酸钠固定化污泥基生物质炭对铜的吸附性能研究[J].环境工程,2017,35(2):37-42.
[8]Li L Y,Gong X D,Abida O.Waste-to-resources:Exploratory surface modification of sludge-based activated carbon by nitric acid for heavy metal adsorption[J].Waste Management,2019,87(3):375-386.
[9]徐志峰,剧智华,月日辉,等.选择性磷酸沉淀分离铬铁的新工艺[J].有色金属科学与工程,2016,7(6):19-24.
[10]程建国,林永树,阳华玲,等.石灰絮凝法去除矿坑废水中锰离子的研究[J].矿冶工程,2012,32(2):45-48.
[11]舒艳,李科林,宋金风,等.狭叶香蒲活性炭对Cd2+与Pb2+的吸附及机理分析[J].环境工程学报,2016,10(1):181-188.
[12]袁宇,黄红丽,罗琳.堆肥对水体重金属铜和锌的吸附性能研究[J].湖南农业科学(上半月),2014(4):32-34.
[13]王彤彤,王晓琳,任志胜,等.不同原料制备的生物炭形貌结构及表面特性研究[J].环境科学与技术,2017,40(1):42-48.
[14]郑凯琪,王俊超,刘姝彤,等.不同热解温度污泥生物炭对Pb2+、Cd2+的吸附特性[J].环境工程学报,2016,10(12):7277-7282.
[15]Guo X J,Wu Z J,He M C,et al.Adsorption of antimony onto iron oxyhydroxides:Adsorption behavior and surface structure.Journal of Hazardous Materials[J].Journal of Hazardous Materials,2014,276:339-345.
[16]李坤权,李烨,郑正,等.高比表面生物质炭的制备、表征及吸附性能[J].环境科学,2013,34(1):328-335.
[17]张再利,况群,贾晓珊.花生壳吸附Pb2+、Cu2+、Cr3+、Cd2+、Ni2+的动力学和热力学研究[J].生态环境学报,2010,19(12):2973-2977
[18]魏东宁,杜淑雯,罗琳,等.改性吸附剂对水中Cu(Ⅱ)的去除效果研究[J].矿冶工程,2018,38(4):94-97,101.