不同制备温度下污泥生物炭对Cr(Ⅵ)的吸附特性  

ADSORPTION CHARACTERISTICS OF Cr(Ⅵ)BY SLUDGE BIOCHAR UNDER DIFFERENT PYROLYSIS TEMPERATURES

作　　者：陈林[1] 平巍[1] 闫彬[1] 吴彦 付川[1] 黄炼旗 刘露 印茂云 CHEN Lin;PING Wei;YAN Bin;WU Yan;FU Chuan;HUANG Lian-qi;LIU Lu;YIN Mao-yun(Key Laboratory of Water Environment Evolution and Pollution Control in The Three Gorges Reservoir Region,Chongqing Three Gorges University,Chongqing 404100,China)

机构地区：[1]重庆三峡学院三峡库区水环境演变与污染防治重庆高校市级重点实验室,重庆404100

出　　处：《环境工程》2020年第8期119-124,共6页Environmental Engineering

基　　金：国家自然科学基金面上项目(31670467);国家自然科学基金青年项目(51808089);重庆市教委科学技术研究重点项目(KJZD-K201801202);2018年重庆三峡学院研究生科研创新项目(YJSKY1811)。

摘　　要：以城市剩余污泥为原料,于300,400,500,600℃温度条件下制备生物炭,通过单因素静态吸附实验探讨制备温度对生物炭吸附Cr(Ⅵ)的影响。结果表明:在500℃以内随着温度上升制备的生物炭对Cr(Ⅵ)的吸附量增加,制备温度高于500℃后变化不明显;扫描电镜(SEM)、比表面积(BET)、傅里叶红外光谱(FTIR)表征结果显示,热解温度对生物炭表面形貌和官能团组成有显著影响;等温模型及动力学拟合结果表明,生物炭吸附Cr(Ⅵ)为单分子层吸附、物理-化学复合吸附。热解温度对污泥制备生物炭吸附Cr(Ⅵ)的性能有显著影响,最佳制备温度为500℃,在此条件制备的生物炭对Cr(Ⅵ)的理论吸附量可达7.93 mg/g。In this study,biochars were prepared by sewage sludge at 300,400,500,600℃,respectively.The influence of preparation temperature on Cr(Ⅵ)adsorption by biochar was investigated through single factor static adsorption experiment.The results showed the positive effect of Cr(Ⅵ)adsorption along with increase of preparation temperature under 500℃,and negligible change within the preparation temperature range of 500~600℃.Differences of surface morphology and functional groups of biochars prepared by various temperature were characterized by SEM(scanning electron microscope),BET(Brunauer Emmett Teller)and FTIR(Fourier transform infrared),which were considered as the capital factor for diversity of adsorption.The results of isothermal model and kinetic fitting demostrated that the Cr(Ⅵ)adsorption by biochars as modality of monomolecular layer,physical-chemical composite adsorption;the experimental results showed that the optimal preparation temperature was 500℃.The theoretical adsorption capacity for Cr(Ⅵ)of biochar prepared under the condition of 500℃reached 7.93 mg/g.The research conclusion could provide theoretical basis and practical support for recycling of municipal sludge.

关 键 词：污泥 生物炭 吸附 Cr(Ⅵ) 

分 类 号：X703[环境科学与工程—环境工程]