酸-碱改性粉煤灰吸附剂的制备及其对染料的去除性能

doi:10.11901/1005.3093.2023.238

材料研究学报

2024, Vol. 38

Issue (5): 379-389 DOI: 10.11901/1005.3093.2023.238

研究论文

本期目录 | 过刊浏览

酸-碱改性粉煤灰吸附剂的制备及其对染料的去除性能

王琰¹, 张昊², 常娜³, 王海涛¹(

)

^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

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

WANG Yan¹, ZHANG Hao², CHANG Na³, WANG Haitao¹(

)

^1.School of Environmental Science and Engineering, TianGong University, Tianjin 300387, China
^2.School of Textile Science and Engineering, TianGong University, Tianjin 300387, China
^3.School of Chemical Engineering and Technology, TianGong University, Tianjin 300387, China

引用本文:

王琰, 张昊, 常娜, 王海涛. 酸-碱改性粉煤灰吸附剂的制备及其对染料的去除性能[J]. 材料研究学报, 2024, 38(5): 379-389.
Yan WANG, Hao ZHANG, Na CHANG, Haitao WANG. Preparation of Acid-alkali Modified Coal Fly Ash Adsorbent and Its Removal Performance on Dyes[J]. Chinese Journal of Materials Research, 2024, 38(5): 379-389.

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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 m²/g增大到32.0 m²/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。

关键词 ：无机非金属材料, 粉煤灰改性, 染料废水, 脱色率, 吸附

Abstract：

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 capacity for dyes, and the effect of pH value of wastewaters on adsorption capacity for dyes were examined. The characterization results showed that the surface of MCFA is rather rough and porous, with a specific surface area of 32.0 m²/g, superior to 5.2 m²/g of the original CFA, accordingly its adsorption performance 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 solution 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 involved 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 significant, which can be used as an excellent adsorbent in the treatment industry of dye wastewaters.

Key words： inorganic non-metallic materials modification of coal fly ash dye wastewater decolorization adsorption

收稿日期: 2023-04-23

ZTFLH:

O647.33

基金资助:国家重点研发计划(2023YFE0101000)

通讯作者: 王海涛，教授，wanghaitao@tiangong.edu.cn, 研究方向为新型膜材料、工业废水处理及零排放、海水淡化、环境催化

Corresponding author: WANG Haitao, Tel: (022)83955622, E-mail: wanghaitao@tiangong.edu.cn

作者简介: 王琰，女，1997年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2023.238 或 https://www.cjmr.org/CN/Y2024/V38/I5/379

图1 HCl-NaOH法改性粉煤灰吸附材料的制备流程

表1 吸附用染料的基本参数

图2 CFA和MCFA的SEM照片

图3 CFA和MCFA样品的孔径分布和氮气吸脱附曲线

表2 CFA和MCFA的比表面积和孔径尺寸

图4 CFA和MCFA的红外光谱

图5 CFA和MCFA的X射线衍射谱

图6 CFA和MCFA的XPS谱

图7 CFA的XPS谱

图8 MCFA的XPS谱

图9 不同剂量的MCFA对染料的吸附性能

图10 染料的浓度对其吸附效果的影响

表3 MCFA吸附4种染液的等温学拟合参数

图11 4种染液的吸附时间对吸附效果的影响

表4 MCFA吸附4种染液的动力学拟合参数

图12 在pH值为3~11条件下MCFA对4种染液的吸附量

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