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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received July 13, 2022
Revised October 10, 2022
Accepted November 10, 2022

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Synthesis of carbon/P-zeolite composites from coal gasification fine slag and studies on adsorption characteristics for methylene blue

Rui Shu¹ Jiaming Bai¹ Feiqiang Guo^1† Songbo Mao¹ Qixia Qiao¹ Kaiming Dong¹ Lin Qian¹ Yonghui Bai^2†

¹School of Low-Carbon Energy and Power Engineering, China University of Mining and Technology, 221116 Xuzhou, China ²State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China

fqguo@cumt.edu.cn, yhbai@nxu.edu.cn

Korean Journal of Chemical Engineering, August 2023, 40(8), 1639-1649(11), 10.1007/s11814-022-1344-4

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Abstract

Carbon/P-zeolite composites (CPZCs) were synthesized by high-temperature activation followed by hydrothermal crystallization using waste coal gasification fine slag as the raw material and NaOH as the activator. Methylene blue was selected as a dye pollutant for the adsorption experiment to investigate the adsorption property of the carbon/ P-zeolite composites. It was found that the structure of CPZCs mainly depended on the mass ratio of NaOH to the coal gasification slag. At a proper NaOH to the coal gasification fine slag mass ratio of 1.0, the as-synthesized CPZC1.0 exhibited a typical Na-P zeolite structure with a relatively high specific surface area of 200 m2 /g and pore volume of 0.21 cm3 /g. CPZC-1.0 showed excellent performance on methylene blue adsorption, with the adsorption capacity reaching 130 mg/g with removal efficiency of 81.6% at 303 K for the 100 mg/L initial methylene blue solution. The calculation results of adsorption thermodynamics indicated that the adsorption process to methylene blue by CPZCs was a spontaneous and entropy-driven endothermic process. Based on the above research, it is speculated that the adsorption mechanism of CPZCs to methylene blue might be due to the van der Waals force, intermolecular hydrogen bond and electrostatic attraction between Na-P zeolite and methylene blue.

Keywords

Coal Gasification Fine Slag Zeolite Methylene Blue Adsorption

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