首页|Solvothermal synthesis and adsorption performance of layered boehmite using aluminum chloride and high-alumina fly ash

Solvothermal synthesis and adsorption performance of layered boehmite using aluminum chloride and high-alumina fly ash

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High alumina fly ash (FAHAl) is a kind of bulk solid waste unique to China, whose availability of high-value aluminum and the threat to the environment makes its high-value utilization urgent. In this work, the alumina containing leaching solution obtained from Na2CO3 roasting and HCl leaching of FAHAl was used as the mother liquor to prepare layered boehmite in situ. The preparation process with AlCl3 as the raw material was also compared. The formation process and mechanism of boehmite, the choice of solvent, along with the adsorption capability of Congo red were analyzed by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller method and adsorption experiments. Results showed that during the preparation of layered boehmite, the precursor Al(OH)3 from the reaction of Al3+ and OH- is transformed into boehmite γ-AlOOH. The existence of ethanol is beneficial to regulate and promote the growth of boehmite crystal effectively. When water and ethanol are mixed with a volume ratio of 2:1 and used as the solvent, the maximum specific surface area of the boehmite is obtained at 135.7 m2·g-1, and 99.16％of Congo red can be absorbed after 10 min when AlCl3 is used as a raw material. As purified leaching solution is used as the mother liquid, the crystallinity of boehmite decreases slightly when the pH value decreases from 12.5 to 11. When pH is 11, the removal efficiency of Congo red reaches a maximum of 72.25％. This process not only achieves the extraction of aluminum and high-value utilization of FAHAl but also provides a thought to prepare layered boehmite with adsorption properties.

High-alumina fly ashLayered boehmiteIn-situ preparationSolvothermal synthesisAdsorptionHigh-value utilization

Jing Wen、Ruirui Yuan、Tao Jiang、Tangxia Yu、Yufan Zhang

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School of Metallurgy, Northeastern University, Shenyang 110819, China

Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang 110819, China

Liaoning Key Laboratory for Metallurgical Sensor and Technology, Shenyang 110819, China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

521742775220430952374300

2024

10.1016/j.cjche.2024.03.008

中国化学工程学报(英文版)
中国化工学会

中国化学工程学报(英文版)

CSTPCDEI
影响因子：0.818
ISSN：1004-9541
年,卷(期)：2024.70(6)
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