Highly-effective phosphate removal from aqueous solutions by calcined nano-porous palygorskite matrix with embedded lanthanum hydroxide

doi:10.1016/j.clay.2018.07.005

	Highly-effective phosphate removal from aqueous solutions by calcined nano-porous palygorskite matrix with embedded lanthanum hydroxide
	Kong, Lingchao; Tian, Yu; Li, Ning; Liu, Yang; Zhang, Jian; Zhang, Jun; Zuo, Wei
	2018-09-15
发表期刊	APPLIED CLAY SCIENCE
ISSN	0169-1317
EISSN	1872-9053
卷号	162 页码:507-517
摘要	Efficient phosphate removal from wastewater is critical for the safety of natural water bodies against eutrophication and for the replenishment of unrenewable phosphorus resources. In order to enhance phosphate capture efficiency and exploit raw clay for high value-added products, HPAL-LaOH was fabricated by embedding lanthanum hydroxide onto calcined nano-porous palygorskite clay through a simple-green hydrothermal method where the host palygorskite with cross-linked networks providing abundant binding sites for La(OH)(3) incorporation, allowing the accessibility of phosphate for the adequate crystallization of lanthanum phosphate without triggering pore blockage. Excellent phosphate adsorption capacity (109.63 mg/g) was achieved by HPAL-LaOH, over 13 times higher than that of raw palygorskite, also much higher than commercial pure La (OH)(3) (69.64 mg/g) in batch runs. Interestingly, for solutions below 100 mg/L in a wide pH range of 3-11, almost complete phosphate sequestration (< 0.01 mg/L) was achieved. The presence of high level competing anions (sulfate, nitrate, bicarbonate and chloride) merely exhibited an insignificant effect. Notably, HPAL-LaOH demonstrated satisfactory recyclability, settleability and excellent stability with negligible lanthanum leaching even under ultrasonic challenge. Mechanism analysis revealed that the impregnated La(OH)(3) exerted specific phosphate adsorption where inner-sphere complexation by ligand-exchange played a major role. As compared to several La-based adsorbents developed recently for phosphate sequestration, HPAL-LaOH exhibited great competiveness in terms of adsorption capacity and La usage. The results indicated the potential utilization of HPAL-LaOH as a highly cost-effective adsorbent for phosphate removal from wastewater.
关键词	Palygorskite Lanthanum hydroxide Phosphate adsorption Surface complexation
DOI	10.1016/j.clay.2018.07.005
收录类别	SCI
语种	英语
WOS关键词	ADSORPTION REMOVAL ; HEAVY-METALS ; WASTE-WATER ; PHOSPHORUS ; RECOVERY ; ATTAPULGITE ; BENTONITE ; LA(OH)(3) ; SYSTEMS ; ACID
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Mineralogy
WOS记录号	WOS:000440775900055
出版者	ELSEVIER SCIENCE BV
国家	中国
省份	Heilongjiang
项目编号	2017DX02 ; 2017AB4AS035
引用统计
文献类型	期刊论文
专题	任务一_子任务一循证社会科学证据集成任务一
作者单位	Harbin Inst Technol, State Key Lab Urban Water Resource & Environm, Sch Environm, Harbin 150090, Heilongjiang, Peoples R China
推荐引用方式 GB/T 7714	Kong, Lingchao,Tian, Yu,Li, Ning,et al. Highly-effective phosphate removal from aqueous solutions by calcined nano-porous palygorskite matrix with embedded lanthanum hydroxide[J]. APPLIED CLAY SCIENCE,2018,162:507-517.
APA	Kong, Lingchao.,Tian, Yu.,Li, Ning.,Liu, Yang.,Zhang, Jian.,...&Zuo, Wei.(2018).Highly-effective phosphate removal from aqueous solutions by calcined nano-porous palygorskite matrix with embedded lanthanum hydroxide.APPLIED CLAY SCIENCE,162,507-517.
MLA	Kong, Lingchao,et al."Highly-effective phosphate removal from aqueous solutions by calcined nano-porous palygorskite matrix with embedded lanthanum hydroxide".APPLIED CLAY SCIENCE 162(2018):507-517.