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Li H, Song J, Ma C, Shen C, Chen M, Chen D, Zhang H, Su M. Uranium recovery from weakly acidic wastewater using recyclable γ-Fe 2O 3@meso-SiO 2. J Environ Manage 2024; 349:119347. [PMID: 37897898 DOI: 10.1016/j.jenvman.2023.119347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 09/28/2023] [Accepted: 10/14/2023] [Indexed: 10/30/2023]
Abstract
U(VI)-containing acidic wastewater produced from uranium mining sites is an environmental hazard. Highly efficient capture of U(VI) from such wastewater is of great significance. In this study, a mesoporous core-shell material (i.e. γ-Fe2O3@meso-SiO2) with magnetically and vertically oriented channels was rationally designed through a surfactant-templating method. Batch experiment results showed that the material had an efficiency level of >99.7% in removing U(VI) and a saturated adsorption capacity of approximately 41.40 mg/g, with its adsorption reaching equilibrium in 15 min. The U(VI) adsorption efficiency of the material remained above 90% in a solution with competing ions and in acidic radioactive wastewater, indicating its ability to selectively adsorb U(VI). The material exhibited high adsorption efficiency and desorption efficiency in five cycles of desorption and regeneration experiments. According to the results, the mechanism through which γ-Fe2O3@meso-SiO2 adsorbs U(VI) was dominated by chemical complexation and electrostatic attraction between these two substances. Therefore, γ-Fe2O3@meso-SiO2 is not only beneficial to control the environmental migration of uranium, but also has good selective adsorption and repeated regeneration performance when used to recover U(VI) from weakly acidic wastewater in uranium mining.
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Affiliation(s)
- Hong Li
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, Guangdong, China
| | - Juexi Song
- College of Mechanical and Electrical Engineering, Qingdao University, Qingdao, 266071, Shandong, China
| | - Chuqin Ma
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, Guangdong, China
| | - Congjie Shen
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, Guangdong, China
| | - Miaoling Chen
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, Guangdong, China
| | - Diyun Chen
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, Guangdong, China
| | - Hongguo Zhang
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, Guangdong, China
| | - Minhua Su
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, Guangdong, China.
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Li K, Niu X, Zhang D, Guo H, Zhu X, Yin H, Lin Z, Fu M. Renewable biochar derived from mixed sewage sludge and pine sawdust for carbon dioxide capture. Environ Pollut 2022; 306:119399. [PMID: 35525511 DOI: 10.1016/j.envpol.2022.119399] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 03/24/2022] [Accepted: 04/30/2022] [Indexed: 06/14/2023]
Abstract
Carbon dioxide (CO2) is the main anthropogenic greenhouse gas contributing to global warming. In this study, a series of KOH-modified biochars derived from feedstock mixtures (i.e., S3W7 biomass consisting of 70% pine sawdust and 30% sewage sludge; S5W5 biomass consisting of 50% pine sawdust and 50% sewage sludge) at different temperature (i.e., 600-800 °C) were prepared for evaluating CO2 adsorption performance. The KOH-activated biochars prepared with S3W7 biomass displayed larger surface areas and micropore volumes compared to those of S5W5 biochars. In particular, the highest CO2 adsorption capacity (177.1 mg/g) was observed on S3W7 biomass at 700 °C (S3W7-700K), due to the largest surface area (2623 m2/g) and the highest micropore volume (0.68 cm3/g). Furthermore, surface functional groups, hydrophobicity, and aromaticity of biochar and presence of hetero atoms (N) also were actively involved in CO2 adsorption of biochar. In addition, in situ DRIFTS analysis advanced current understanding for the chemical sorption mechanisms by identifying the transformation composites of CO2 on biochars, and characterizing the weakly adsorbed and newly formed mineral species (e.g., carbonates) during the CO2 sorption process. This study may provide an insight into the research of CO2 capture by identifying physical and chemical adsorption, and expand the effective utilization of natural biomass-based biochar for mitigation greenhouse gas emission.
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Affiliation(s)
- Kai Li
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, PR China
| | - Xiaojun Niu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, PR China; Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, 525000, PR China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, PR China
| | - Dongqing Zhang
- Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, 525000, PR China.
| | - Huafang Guo
- The Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, PR China
| | - Xifen Zhu
- Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, 525000, PR China
| | - Hua Yin
- The Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, PR China
| | - Zhang Lin
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, PR China
| | - Mingli Fu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, PR China
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Li Q, Liang M, Han X, Hou Y, Huang Z. Insight into the enhancing activity and stability of Ce modified V 2O 5/AC during cyclic desulfurization-regeneration-denitrification. J Hazard Mater 2022; 424:127397. [PMID: 34638078 DOI: 10.1016/j.jhazmat.2021.127397] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Revised: 09/28/2021] [Accepted: 09/28/2021] [Indexed: 06/13/2023]
Abstract
Cyclic desulfurization-regeneration-denitrification over carbon-based catalysts is a promising technology for SO2 and NOx simultaneous elimination in steel industry. Regeneration is imperative to the long-term operation of the process, while the research is limited. In this work, Ce modified V2O5/AC catalyst (CeVOx/AC) with higher desulfurization and denitrification activity was prepared and the effect of cyclic regeneration was investigated. Results illustrated that the desulfurization and denitrification activity of CeVOx/AC gradually improved with increasing the regeneration cycles at the optimum regeneration temperature of 470 °C in N2. The increasing Ce3+, V5+ and oxygen vacancies, enhanced surface acidity and improved redox ability contributed to the catalytic activity of regenerated catalysts. For desulfurization, more SO2 transformed into H2SO4 rather than to metal sulfates after cyclic regeneration. For denitrification, the improved redox ability accelerated the oxidation of NO to active NO2, bridged nitrites and nitrates, and the enhanced acidity facilitated the NH3 adsorption, further generating more -NH2 and promoting the SCR activity of regenerated samples. The CeVOx/AC with good activity and regenerative stability shows great application potential in steel industry for the simultaneous SO2 and NOx removal.
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Affiliation(s)
- Qiaoyan Li
- College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
| | - Meisheng Liang
- College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
| | - Xiaojin Han
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
| | - Yaqin Hou
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Zhanggen Huang
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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Chen D, Zhang M, Zhou F, Hai H, Li J. Ultrasensitive electroluminescence biosensor for a breast cancer marker microRNA based on target cyclic regeneration and multi-labeled magnetized nanoparticles. Mikrochim Acta 2019; 186:628. [PMID: 31418084 DOI: 10.1007/s00604-019-3719-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2019] [Accepted: 07/31/2019] [Indexed: 11/27/2022]
Abstract
An electrochemiluminescent (ECL) biosensor is described for the determination of the breast cancer biomarker microRNA. The method is based on the amplification via target cyclic regeneration through a system of hairpin DNA probes, primers, and Klenow fragment of DNA polymerases combined with CdTe quantum dots (QDs) and gold nanoparticles. The assay is performed by exploiting the luminescence properties of CdTe-QDs and K2S2O8 as a co-reactive agent to increase the ECL signal. It was successfully applied to ECL-based detection of a 20-mer microRNA. The sensor has a linear response in the 0.1 fM to 0.2 pM microRNA concentration range and a detection limit as low as 33 aM. The assay has been applied to the determination of microRNA spiked in serum samples, and recoveries ranged from 94.4 to 100.5%. Graphical abstract A novel electroluminescence biosensor based on the amplification of target cyclic regeneration is described. It is achieved by using a system of hairpin DNA probes, primers, and Klenow fragment of DNA polymerases combined with CdTe QDs and Au NPs, and was successfully applied to microRNA detection.
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Liu S, Wang N, Zhang Y, Li Y, Han Z, Na P. Efficient removal of radioactive iodide ions from water by three-dimensional Ag2O-Ag/TiO2 composites under visible light irradiation. J Hazard Mater 2015; 284:171-181. [PMID: 25463231 DOI: 10.1016/j.jhazmat.2014.10.054] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Revised: 10/17/2014] [Accepted: 10/20/2014] [Indexed: 06/04/2023]
Abstract
Three-dimensional Ag2O and Ag co-loaded TiO2 (3D Ag2O-Ag/TiO2) composites have been synthesized through a facile method, characterized using SEM, EDX, TEM, XRD, XPS, UV-vis DRS, BET techniques, and applied to remove radioactive iodide ions (I(-)). The photocatalytic adsorption capacity (207.6 mg/g) of the 3D Ag2O-Ag/TiO2 spheres under visible light is four times higher than that in the dark, which is barely affected by other ions, even in simulated salt lake water where the concentration of Cl(-) is up to 590 times that of I(-). The capability of the composites to remove even trace amounts of I(-) from different types of water, e.g., deionized or salt lake water, is demonstrated. The composites also feature good reusability, as they were separated after photocatalytic adsorption and still performed well after a simple regeneration. Furthermore, a mechanism explaining the highly efficient removal of radioactive I(-) has been proposed according to characterization analyses of the composites after adsorption and subsequently been verified by adsorption and desorption experiments. The proposed cooperative effects mechanism considers the interplay of three different phenomena, namely, the adsorption performance of Ag2O for I(-), the photocatalytic ability of Ag/TiO2 for oxidation of I(-), and the readsorption performance of AgI for I2.
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Affiliation(s)
- Shuaishuai Liu
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Na Wang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Yuchang Zhang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Yaru Li
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Zhuo Han
- CECEP Environmental Protection Investment Development Co., Ltd., Jiangxi 3300969, China
| | - Ping Na
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; Tianjin Co-Innovation Center of Chemical Science and Engineering, Tianjin 300072, China.
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