The reuse of nano-TiO2 under different concentration of CO32– using coagulation process and its photocatalytic ability in treatment of methyl orange

doi:10.1016/j.seppur.2021.120152

IR > 土木工程学院

	The reuse of nano-TiO2 under different concentration of CO32– using coagulation process and its photocatalytic ability in treatment of methyl orange
	Liu, Yu 1,2; Xiang, Yu 2; Xu, Hui 2; Li, Huili1,3
	2022-02-01
发表期刊	Separation and Purification Technology
ISSN	1383-5866
卷号	282
摘要	Photocatalysis is highly efficient for the treatment of dyeing wastewater. However, the wastewater still contains a large amount of nano-TiO2 after photocatalysis. In order to reduce the cost of nano-TiO2, different coagulants were used to improve the solid/liquid separation efficiency. At the same time, the reuse of flocs has raised increasing attention after coagulation. In this study, we report on the recycling of flocs for the production of AlCl3 and TiO2 formed flocs (AT1) and Al13 and TiO2 formed flocs (AT2) through a simple calcination process. Results indicated the flocs formation processes under different concentration of CO32– were Al species distribution and coagulant dosage dependent. Without HA molecules, the reaction between Al-based coagulants and CO32– are the controlling steps in the coagulation process, and Ala and Alb species had different reaction processes. The influence of HA molecules was also studied, and the HA-Al aggregates which could bridge the TiO2 nanoparticles, and thus induce sweep flocculation. Consequently, highly enhanced aggregation rate, due to the heteroaggregation between these aggregates and TiO2 was observed. After calcination, the AT2-10 and AT2-20 (CO32–: 10, 20 mmol/L) with petal-like structures (mesoporous), relatively high specific surface areas, i.e. 83.98 m2/g and 78.38 m2/g and high photocatalytic degradation, i.e. 72.79%, 67.78% (compared to nano-TiO2, AT1-10 and AT1-20), were obtained. Additionally, oxygen vacancy (OV) was generated on the surface of the recycled AT2-10 and AT2-20, which display strong photocatalytic performance for the degradation of MO greater than 65%, under ultraviolet (UV) irradiation and without any sacrificial reagents. This study proposes a new perspective on recycling coagulated flocs for practical application in wastewater treatment. © 2021 Elsevier B.V.
关键词	Agglomeration Aggregates Aluminum Aluminum chloride Azo dyes Calcination Coagulation Molecules Photocatalysis Recycling Wastewater reclamation Wastewater treatment Aluminum species CO32 Coagulation process Dyeing wastewater Large amounts Methyl Orange Nano-TiO 2 Photo-catalytic Photocatalytic reactions Reuse
DOI	10.1016/j.seppur.2021.120152
收录类别	EI
语种	英语
出版者	Elsevier B.V.
EI入藏号	20214811225989
EI主题词	Titanium dioxide
EI分类号	406 Highway Engineering ; 412.2 Concrete Reinforcements ; 452.3 Industrial Wastes ; 452.4 Industrial Wastes Treatment and Disposal ; 541.1 Aluminum ; 741.1 Light/Optics ; 802.2 Chemical Reactions ; 802.3 Chemical Operations ; 803 Chemical Agents and Basic Industrial Chemicals ; 804 Chemical Products Generally ; 804.1 Organic Compounds ; 804.2 Inorganic Compounds ; 931.3 Atomic and Molecular Physics
引用统计	被引频次：6[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/157892
专题	土木工程学院
作者单位	1.School of Civil Engineering, Lanzhou University of Technology, Lanzhou; 730050, China; 2.State Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing; 100085, China; 3.School of Civil Engineering, Kashgar university, Kashgar; 844099, China
第一作者单位	土木工程学院
第一作者的第一单位	土木工程学院
推荐引用方式 GB/T 7714	Liu, Yu,Xiang, Yu,Xu, Hui,et al. The reuse of nano-TiO2 under different concentration of CO32– using coagulation process and its photocatalytic ability in treatment of methyl orange[J]. Separation and Purification Technology,2022,282.
APA	Liu, Yu,Xiang, Yu,Xu, Hui,&Li, Huili.(2022).The reuse of nano-TiO2 under different concentration of CO32– using coagulation process and its photocatalytic ability in treatment of methyl orange.Separation and Purification Technology,282.
MLA	Liu, Yu,et al."The reuse of nano-TiO2 under different concentration of CO32– using coagulation process and its photocatalytic ability in treatment of methyl orange".Separation and Purification Technology 282(2022).