Adsorptive removal of phosphate from aqueous solutions using different types of red mud

Water Science and Technology : a Journal of the International Association on Water Pollution Research
Tengfei GuoYang Dai

Abstract

Red mud (RM) is an industrial waste generated during production of alumina from using the Bayer process or the sintering process. Four types of red mud from China were characterized for their diverse chemical and mineral compositions using inductively coupled plasma-atomic emission spectroscopy (ICP-AES), inductively coupled plasma-mass spectrometry (ICP-MS) and X-ray diffraction (XRD). Acid treatment was employed to obtain activated red mud (ARM), posing increased surface areas from 10-28 m2/g to 220-350 m2/g. RMs and ARMs were used to adsorb phosphate in solution to compare the adsorption capacity. Sample GZ3, a red mud from the sintering process, presented the highest adsorption capacity among the four raw RMs, posing an adsorption capacity of 0.37 mg P/g in the solution of 1 mg P/L with a solid/solution ratio of 0.5 g: 1 L. Whereas, activated GX (AGX), a high iron Bayer red mud from diaspore bauxite, showed the highest adsorption capacity of all the ARMs, with an adsorption capacity of 1.92 mg P/g in the same condition. The dynamic studies indicate that the adsorption mainly followed the pseudo second-order model. The models of Freundlich and Langmuir were used to simulate the sorption equilibrium on GZ3 and AGX. It suggest...Continue Reading

References

Dec 16, 1998·Journal of Colloid and Interface Science·J PradhanR S Thakur
Dec 21, 2004·Water Research·Shaobin WangZ H Zhu
Apr 20, 2006·Journal of Hazardous Materials·Yanzhong LiZhiping Jia
Mar 4, 2008·Journal of Hazardous Materials·Weiwei HuangFouad Haghseresht

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Citations

Apr 18, 2020·Environmental Science and Pollution Research International·Shicheng MaNing Wang
Jul 30, 2020·Journal of Environmental Management·Tengfei GuoNing Wang
Jun 10, 2021·Bulletin of Environmental Contamination and Toxicology·Aracelis NarayanAbrahan Mora

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