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92 results on '"Wei, Sun"'

7. In-situ Growth of Perovskite Single Crystal Thin Films on Transport Layers with High Area to Thickness Ratio and Low Trap Density Simultaneously

Author

Zhaojin Wang, Chengwei Shan, Chenxi Liu, Xiaobing Tang, Haodong Tang, Zhulu Song, Jiawei Wang, Zhenwei Ren, Jingrui Ma, Haoran Wang, Jiayun Sun, Wallace C. H. Choy, Yanjun Liu, Xiao Wei Sun, Aung Ko Ko Kyaw, Dan Wu, and Kai Wang

Subjects
History, Polymers and Plastics, Business and International Management, Industrial and Manufacturing Engineering
Published
2022

9. Differential Requirement of 3D Genomic Organization for the  Mdm1-Il22-Ifng Locus Regulation in Adaptive Versus Innate Responses

Author

Chunhong Liu, Hiroyuki Nagashima, Nilisha Fernando, Sadie Signorella, Will Montgomery, Ai Ing Lim, Oliver Harrison, Victor Bass, Lauren Reich, Chen Yao, Hong-Wei Sun, Stephen R. Brooks, Kan Jiang, Vijayaraj Nagarajan, Rachael Phillips, Yohei Mikami, Caleb A. Lareau, Yuka Kanno, Dragana Jankovic, Martin J. Aryee, Aleksandra Pekowska, Yasmine Belkaid, John O’Shea, and Han-Yu Shih

Subjects
History, Polymers and Plastics, Business and International Management, Industrial and Manufacturing Engineering
Published
2022

30. Eu3+, Tb3+ Doping Induced Tunable Luminescence of Cs2agincl6 Double Perovskite Nanocrystals and its Mechanism

Author

Endian Cui, Xiangyang Yuan, Luomeng Tang, Lu Yang, Xiaoyan Yang, Xiaoling Liao, Jianfeng Tang, Yanan Zhao, Wei Sun, Kai Liu, Yingshuai Liu, and Jing Liu

Subjects
History, Polymers and Plastics, General Physics and Astronomy, Surfaces and Interfaces, General Chemistry, Business and International Management, Condensed Matter Physics, Industrial and Manufacturing Engineering, Surfaces, Coatings and Films
Published
2022

42. Deep Purification of Copper from Cu(Ii)-Edta Acidic Wastewater by Fe(Iii) Replacement/Diethyldithiocarbamate Precipitation

Author

Mingjun Han, Jianyong He, Xin Wei, Sai Li, Chenyang Zhang, Hongliang Zhang, Wei Sun, and Tong Yue

Subjects
Ions, History, Environmental Engineering, Polymers and Plastics, Health, Toxicology and Mutagenesis, Public Health, Environmental and Occupational Health, General Medicine, General Chemistry, Wastewater, Pollution, Ferric Compounds, Industrial and Manufacturing Engineering, Coordination Complexes, Environmental Chemistry, Business and International Management, Ditiocarb, Copper, Edetic Acid, Water Pollutants, Chemical
Abstract

Cu(II)-EDTA is a highly stable typical metal-organic complex in a wide pH range (3.0-12.0) and it is difficult to deeply purify Cu(II) by conventional precipitation methods. In this study, Fe(III) replacement/diethyldithiocarbamate (DDTC) precipitation combined process is proposed as a promising strategy to achieve the deep purification of Cu(II) from Cu(II)-EDTA acidic wastewater. The underlying mechanism has also been systematically elucidated by chemical equilibriums, experiments, and density functional theory (DFT) calculations, laying a foundation for the development and application. Chemical equilibriums show that Fe(III) replacement favors the stoichiometric release of Cu(II) from Cu(II)-EDTA and the formation of Fe(III)-EDTA complex under acidic conditions. Experimentally, Cu(II) is removed (over 99.99%) and deeply purified (under 0.008 mg/L) under the optimal conditions, which is lower than the most stringent discharge standards of copper ions in electroplating effluent (0.5 mg/L, China). DFT calculations reveal that DDTC could further precipitate the released free copper ions via the carbon disulfide (-C(=S)-S) chelating group while exhibiting a slight effect on the Fe(III) in Fe(III)-EDTA. Considering these results, the electronic structures of Cu(II) and Fe(III), as well as their interaction with EDTA and DDTC ligands, are discussed to understand the mechanism of Fe(III)/DDTC process. By introducing a low dosage of Fe(III), the DDTC could efficiently purify Cu(II) from the Cu(II)-EDTA acid wastewater and realize the near-zero discharge of metal pollutants in metal-organic complex wastewater. It is believed that the main findings may benefit the water pollution reduction and comprehensive recycling of metal resources.

Published
2022

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