Removal of Congo red using the chlorinated Ca-Al layered double hydroxide produced from the desulfurization circulating wastewater

doi:10.5004/dwt.2021.27770

CORC > 兰州理工大学 > 兰州理工大学 > 石油化工学院

	Removal of Congo red using the chlorinated Ca-Al layered double hydroxide produced from the desulfurization circulating wastewater
	Kong, Xiuqin; Zhang, Nini; Lian, Yiming; Tang, Qianjun
刊名	DESALINATION AND WATER TREATMENT
	2021-10
卷号	238 页码:294-305
关键词	Layered double hydroxide (CaAl-LDH-Cl) Congo red Adsorption
ISSN号	1944-3994
DOI	10.5004/dwt.2021.27770
英文摘要	The recycling and utilization of the solid precipitate produced by the treatment of the chlorine containing desulfurization circulating wastewater using ultra-high lime with the aluminum process were studied. By means of X-ray diffraction, Fourier-transform infrared, scanning electron microscopy and volumetric adsorption analyzer, it was proved that the main composition of the precipitation was the chlorinated Ca-Al layered double hydroxide (CaAl-LDH-Cl). This precipitation was named waste-CaAl-LDH-Cl in this paper. It was used as an adsorbent to remove Congo red (CR). The research showed that waste-CaAl-LDH-Cl is an effective adsorbent for the removal of CR dye from the aqueous solutions. Adsorption of CR was found to increase with the increase of contact time, initial dye concentration and solution temperature. The adsorption of CR on waste-CaAl-LDH-Cl was favored at an acidic medium. The adsorption kinetics followed the pseudo-second order model, whereas Langmuir adsorption isotherm fitted better to obtained data. The highest adsorption of 123.9 mg/g was recorded at 90 min and 313 K. Delta G degrees = -2.6757, -6.8761 and -12.7107 kJ/mol, Delta H degrees = 301.1145 kJ/mol, these data suggested that the adsorption process was spontaneous and endothermic. The adsorption mechanism included the electrostatic interaction, hydrogen bond and surface complexation. The results suggested that waste-CaAl-LDH-Cl is an efficient material for the removal of anionic organic pollutants from the wastewater.
WOS研究方向	Engineering ; Water Resources
语种	英语
出版者	DESALINATION PUBL
WOS记录号	WOS:000718631700027
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/150003]
专题	石油化工学院
作者单位	Lanzhou Univ Technol, Sch Petrochem Engn, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Kong, Xiuqin,Zhang, Nini,Lian, Yiming,et al. Removal of Congo red using the chlorinated Ca-Al layered double hydroxide produced from the desulfurization circulating wastewater[J]. DESALINATION AND WATER TREATMENT,2021,238:294-305.
APA	Kong, Xiuqin,Zhang, Nini,Lian, Yiming,&Tang, Qianjun.(2021).Removal of Congo red using the chlorinated Ca-Al layered double hydroxide produced from the desulfurization circulating wastewater.DESALINATION AND WATER TREATMENT,238,294-305.
MLA	Kong, Xiuqin,et al."Removal of Congo red using the chlorinated Ca-Al layered double hydroxide produced from the desulfurization circulating wastewater".DESALINATION AND WATER TREATMENT 238(2021):294-305.