酸-碱改性粉煤灰吸附剂的制备及其对染料的去除性能  

Preparation of Acid-alkali Modified Coal Fly Ash Adsorbent and Its Removal Performance on Dyes

作　　者：王琰 张昊[2] 常娜[3] 王海涛[1] WANG Yan;ZHANG Hao;CHANG Na;WANG Haitao(School of Environmental Science and Engineering,TianGong University,Tianjin 300387,China;School of Textile Science and Engineering,TianGong University,Tianjin 300387,China;School of Chemical Engineering and Technology,TianGong University,Tianjin 300387,China)

机构地区：[1]天津工业大学环境科学与工程学院,天津300387 [2]天津工业大学纺织科学与工程学院,天津300387 [3]天津工业大学化学工程与技术学院,天津300387

出　　处：《材料研究学报》2024年第5期379-389,共11页Chinese Journal of Materials Research

基　　金：国家重点研发计划(2023YFE0101000)。

摘　　要：以粉煤灰(CFA)为原料、以HCl和NaOH为改性剂制备改性粉煤灰多孔吸附剂(MCFA),使用SEM观察、XRD谱、BET、FT-IR、XPS等手段表征改性前后CFA的结构,研究了MCFA的投加量和染料的pH值对染料吸附性能的影响并揭示了吸附机理。结果表明,CFA改性后MCFA的表面粗糙多孔,比表面积从5.2 m^(2)/g增大到32.0 m^(2)/g,其活性提高和吸附位点增多使其吸附性能提高。在吸附剂投加量为2 mL和染料的初始浓度为100 mg/L的条件下,对碱性品红和孔雀石绿的最大去除率可达99%。MCFA对印染废水的吸附过程包括物理吸附和化学吸附,用Freundlich模型能很好地加以描述。用准二级动力学比准一级动力学可描述对4种染料的吸附行为。Coal fly ash(CFA)was modified with HCl and NaOH solutions as to produce a novel modified porous adsorbent(MCFA).The CFA and MCFA were characterized by SEM、BET、FT-IR、XRD、XPS.Meanwhile,simulated wastewaters containing dyes,such as basic violet,basic green,Congo red,and methyl violet,respectively were prepared,then the effect of the MCFA dosage on the adsorption ca-pacity for dyes,and the effect of pH value of wastewaters on adsorption capacity for dyes were exam-ined.The characterization results showed that the surface of MCFA is rather rough and porous,with a specific surface area of 32.0 m^(2)/g,superior to 5.2 m^(2)/g of the original CFA,accordingly its adsorption per-formance may be enhanced due to the increasing active and adsorptive sites on the surface.The MCFA has excellent adsorption effect on the desired four dyes.The maximum removal efficiency of basic violet and basic green all reached 99%,respectively by using adsorbent dosage of 2 mL for a given dye solu-tion of 100 mg/L.By fitting data with isothermal adsorption and kinetic models,it follows that Freundlich isotherm model was fitted for the adsorption process,and both physical and chemical adsorption are in-volved in the adsorption process.The adsorption behavior of all four dyes could be described better by pseudo-second-order kinetics rather than pseudo-first-order kinetics,and the adsorption effect was signif-icant,which can be used as an excellent adsorbent in the treatment industry of dye wastewaters.

关 键 词：无机非金属材料 粉煤灰改性 染料废水 脱色率 吸附 

分 类 号：O647.33[理学—物理化学]