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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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⁺

Received: 13 November 2023

PACS:

X703.1

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	SUN Hao-yong
	WANG Ze-hua
	YAO Yi-yang
	WU Dai-she

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SUN Hao-yong,WANG Ze-hua,YAO Yi-yang等. Adsorption of Cu²⁺ and Cd²⁺ in water by fly ash-based zeolite P[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(6): 3132-3141.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I6/3132

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