Speciation of hydroxyl-Al polymers formed through simultaneous hydrolysis of aluminum salts and urea

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境水质学国家重点实验室

	Speciation of hydroxyl-Al polymers formed through simultaneous hydrolysis of aluminum salts and urea
	Feng, Chenghong ; Wei, Qunshan ; Wang, Shuifeng ; Shi, Baoyou ; Tang, Hongxiao
刊名	COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
	2007-08-15
卷号	303 期号:3 页码:241-248
关键词	hydrolysis products urea keggin-Al-13 hydrolysis model sulphate ion
英文摘要	Urea hydrolysis has always been used to prepare alumina gels and little attention has been paid to the reactive polymeric Al species that is formed before alumina sol-gels occur. Based on the hydrolysis process of aluminum in urea solution at 90 degrees C, speciation and transformation of the reactive hydroxyl-Al polymers obtained by urea hydrolysis was investigated with Ferron assay, solution-state and solid-state Al-27 NMR spectroscopy. Unlike the traditional viewpoint, Keggin-Al-13 can form in solution without localized high alkalinity. The reaction of oligomers with Al(OH)(4)(-) resulted from the dissolving of colloidal Al hydroxides is accountable for the formation of Keggin-Al-13. Al-pl, the defected structure of Al-13, was considered as the transient species in the transformation from Al-13 to crystalline Al hydroxides. Besides Al-13, some other reactive polymers with hexameric ring structure also exist. The two categories of Al species have different transformation models (i.e., forced hydrolysis and spontaneous hydrolysis). The forced hydrolysis model should be the main transformation pattern for Al species under the condition of strong base addition into Al solution. Sulphate ions inhibit the formation of high polymeric Al species and affect the crystal structure of the final Al precipitate. (c) 2007 Elsevier B.V. All rights reserved.
WOS记录号	WOS:000247857800013
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/22596]
专题	生态环境研究中心_环境水质学国家重点实验室
推荐引用方式 GB/T 7714	Feng, Chenghong,Wei, Qunshan,Wang, Shuifeng,et al. Speciation of hydroxyl-Al polymers formed through simultaneous hydrolysis of aluminum salts and urea[J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,2007,303(3):241-248.
APA	Feng, Chenghong,Wei, Qunshan,Wang, Shuifeng,Shi, Baoyou,&Tang, Hongxiao.(2007).Speciation of hydroxyl-Al polymers formed through simultaneous hydrolysis of aluminum salts and urea.COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,303(3),241-248.
MLA	Feng, Chenghong,et al."Speciation of hydroxyl-Al polymers formed through simultaneous hydrolysis of aluminum salts and urea".COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 303.3(2007):241-248.