粉煤灰基P型沸石吸附水中Cu<sup>2+</sup>和Cd<sup>2+</sup>

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摘要以粉煤灰(FA)为原料经水热反应合成了P型沸石(Z-P).采用X射线荧光光谱仪、X射线衍射仪、场发射环境扫描电子显微镜、比表面孔径分析仪、傅里叶变换红外光谱仪和X射线光电子能谱对Z-P进行表征,并研究了其对Cu²⁺和Cd²⁺的吸附性能.结果表明,Z-P的BET比表面积和孔隙体积分别为38.46m²/g和0.2180cm³/g,均高于FA的1.273m²/g和0.0120cm³/g.FA、Z-P对Cu²⁺和Cd²⁺的吸附更符合拟二级动力学模型和Langmuir等温线模型.Z-P对Cu²⁺和Cd²⁺的最大吸附量分别为157.48,131.57mg/g,远高于于FA的30.88,25.47mg/g.Z-P对Cd²⁺的循环再生吸附效果好,但对Cu²⁺的循环再生吸附效果较差.离子强度对Z-P吸附Cu²⁺和Cd²⁺分别起促进和抑制作用.表明Z-P可以作为有效且廉价的Cu²⁺、Cd²⁺吸附剂,为FA的资源化利用和含Cu²⁺、Cd²⁺重金属离子废水吸附剂的开发提供了一种方法.

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	孙昊勇
	汪泽华
	姚亦扬
	吴代赦

关键词 ：粉煤灰, P型沸石, 吸附, Cu²⁺, Cd²⁺

Abstract：Zeolite P(Z-P) was synthesized from fly ash(FA) by hydrothermal reaction. Z-P was characterized by X-ray fluorescence spectrometer, X-ray diffractometer, field emission environmental scanning electron microscope, specific surface aperture analyzer, Fourier transform infrared spectrometer and X-ray photoelectron spectroscopy, and its adsorption properties for Cu²⁺ and Cd²⁺ were studied. The results showed that the BET specific surface area and pore volume of Z-P were 38.46m²/g and 0.2180cm³/g, respectively, which were higher than those of FA (1.273m²/g and 0.0120cm³/g). The adsorption of Cu²⁺ and Cd²⁺ by FA and Z-P was more in line with the pseudo-second-order kinetic model and the Langmuir isotherm model. The maximum adsorption capacities of Cu²⁺ and Cd²⁺ by Z-P were 157.48 and 131.57mg/g, respectively, which were much higher than those of FA (30.88 and 25.47mg/g). Z-P showed good cyclic regeneration and adsorption of Cd²⁺, but it showed poor cyclic regeneration and adsorption of Cu²⁺. The ionic strength promoted and inhibited the adsorption of Cu²⁺ and Cd²⁺ by Z-P, respectively. This paper shows that Z-P can be used as an effective and cheap adsorbent for Cu²⁺ and Cd²⁺, which provides a method for the resource utilization of FA and the development of adsorbent for wastewater containing heavy metal ions of Cu²⁺ and Cd²⁺.

Key words： fly ash zeolite P adsorption Cu²⁺ Cd²⁺

收稿日期: 2023-11-13

PACS:

X703.1

基金资助:国家自然科学基金资助项目(52004128);江西省自然科学基金资助项目(20224BAB213054)

通讯作者: 汪泽华,副教授,wangzehua@ncu.edu.cn E-mail: wangzehua@ncu.edu.cn

作者简介: 孙昊勇(1997-),男,江西赣州人,南昌大学硕士研究生,主要从事粉煤灰基吸附剂对水体重金属的研究.971759704@qq.com.

引用本文:

孙昊勇, 汪泽华, 姚亦扬, 吴代赦. 粉煤灰基P型沸石吸附水中Cu²⁺和Cd²⁺[J]. 中国环境科学, 2024, 44(6): 3132-3141. SUN Hao-yong, WANG Ze-hua, YAO Yi-yang, WU Dai-she. Adsorption of Cu²⁺ and Cd²⁺ in water by fly ash-based zeolite P. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(6): 3132-3141.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I6/3132

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