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Tong Z, Lu J, Hu X, Bu X, Sun Y, Chen Y, Chelgani SC. Ultrasound Pretreatment for Enhancing Fine and Ultrafine Flake Graphite Flotation Beneficiation. ACS OMEGA 2024; 9:10717-10726. [PMID: 38463267 PMCID: PMC10918661 DOI: 10.1021/acsomega.3c09316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Revised: 02/01/2024] [Accepted: 02/08/2024] [Indexed: 03/12/2024]
Abstract
With the severe depletion of coarse flake graphite (a critical raw material) resources, developing and utilizing fine and ultrafine graphite resources have recently attracted attention. Froth flotation is a widely used technique for the initial enrichment of graphite; however, the flotation selectivity decreases significantly along with particle size reduction. Ultrasound pretreatment would be a promising method to improve the flotation of fine particles. As an innovative approach to understand better the flotation response of different flake graphite sizes, this study conducted a comparative analysis based on flotation concentrate yield and ash as well as ash removal rate between the flake graphite with various particle sizes after ultrasound pretreatment. Particle size, X-ray powder diffraction, and scanning electron microscopy and energy dispersive X-ray spectroscopy analyses were used to investigate the effect of ultrasound treatment on mineralogical properties of the flake graphite with varied particle sizes. Process outcomes indicated that the flotation performance of fine flake graphite (mean chord length: 62.63 μm) was significantly enhanced after ultrasound pretreatment. However, flotation of the ultrafine flake graphite (mean chord length: 24.97 μm) after ultrasound treatment was limited due to the difficulty of generating sufficient fragmentation and dissociation by microjets and shock waves formed by the cavitation effect. Compared with conventional flotation, the concentrate yield of ultrasound flotation increased from 88.95 to 94.98%, ash content decreased from 5.72 to 4.87%, and ash removal rate enhanced from 36.94 to 42.61%. Particle size and mineral property analyses confirmed that further crushing and dissociation of the larger flake graphite after ultrasound pretreatment would be the main factors contributing to improved flotation performance. Additionally, the formation of air flocs in the coarse flake graphite during the ultrasound pretreatment process facilitated the flotation recovery of the crushed graphite particles.
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Affiliation(s)
- Zheng Tong
- Key
Laboratory of Coal Processing and Efficient Utilization (Ministry
of Education, School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
| | - Jing Lu
- Shandong
Polytechnic College,Jining, Shandong 272067, China
| | - Xinnan Hu
- Key
Laboratory of Coal Processing and Efficient Utilization (Ministry
of Education, School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
| | - Xiangning Bu
- Key
Laboratory of Coal Processing and Efficient Utilization (Ministry
of Education, School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
| | - Yujin Sun
- College
of Mining Engineering, Taiyuan University
of Technology, Taiyuan, Shanxi 030024, China
- State
Key Laboratory of Mineral Processing, BGRIMM
Technology Group, Beijing 100160, China
| | - Yuran Chen
- School
of Materials Science and Engineering, Zhengzhou
University, Zhengzhou 450001, China
| | - Saeed Chehreh Chelgani
- Minerals
and Metallurgical Engineering, Swedish School of Mines, Department
of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Luleå SE-971 87, Sweden
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Luo Q, Sun C, Zhao J, Cai Q, Yao S. Highly Efficient SnIn 4S 8@ZnO Z-Scheme Heterojunction Photocatalyst for Methylene Blue Photodegradation. MATERIALS (BASEL, SWITZERLAND) 2023; 16:6380. [PMID: 37834516 PMCID: PMC10574009 DOI: 10.3390/ma16196380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 09/17/2023] [Accepted: 09/22/2023] [Indexed: 10/15/2023]
Abstract
Building heterojunctions is a promising strategy for the achievement of highly efficient photocatalysis. Herein, a novel SnIn4S8@ZnO Z-scheme heterostructure with a tight contact interface was successfully constructed using a convenient two-step hydrothermal approach. The phase composition, morphology, specific surface area, as well as photophysical characteristics of SnIn4S8@ZnO were investigated through a series of characterization methods, respectively. Methylene blue (MB) was chosen as the target contaminant for photocatalytic degradation. In addition, the degradation process was fitted with pseudo-first-order kinetics. The as-prepared SnIn4S8@ZnO heterojunctions displayed excellent photocatalytic activities toward MB degradation. The optimized sample (ZS800), in which the molar ratio of ZnO to SnIn4S8 was 800, displayed the highest photodegradation efficiency toward MB (91%) after 20 min. Furthermore, the apparent rate constant of MB photodegradation using ZS800 (0.121 min-1) was 2.2 times that using ZnO (0.054 min-1). The improvement in photocatalytic activity could be ascribed to the efficient spatial separation of photoinduced charge carriers through a Z-scheme heterojunction with an intimate contact interface. The results in this paper bring a novel insight into constructing excellent ZnO-based photocatalytic systems for wastewater purification.
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Affiliation(s)
- Qiang Luo
- School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan 430048, China; (Q.L.); (C.S.)
| | - Changlin Sun
- School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan 430048, China; (Q.L.); (C.S.)
| | - Juan Zhao
- School of Mathematics & Computer Science, Wuhan Polytechnic University, Wuhan 430048, China
| | - Qizhou Cai
- State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China;
| | - Shanshan Yao
- Institute for Advanced Materials, Jiangsu University, Zhenjiang 212013, China;
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Zhang L, Sun Y, Sun J, Cao F. Efficient Cr(vi) removal by expanded graphite synergized with oxalic acid under UV irradiation. RSC Adv 2023; 13:11547-11556. [PMID: 37063732 PMCID: PMC10098653 DOI: 10.1039/d3ra01207g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Accepted: 03/29/2023] [Indexed: 04/18/2023] Open
Abstract
Expanded graphite (EG), an easily-obtained carbon material with the potential of transferring electrons, was utilized successfully in the removal of hazardous hexavalent chromium (Cr(vi)) by environment-friendly oxalic acid (Ox) under UV irradiation. EG with a unique worm-like structure was obtained via a facile microwave treatment. The results showed that the EG + Ox + UV system had optimum performance, removing 99.32% of the Cr(vi) (1 mM) within 60 min at pH = 3, and the kinetic rate constant of Cr(vi) elimination was 7.95 mol L-1 min-1. Three components are potentially involved in the Cr(vi) elimination mechanism by the EG + Ox + UV system: (1) the direct electron transfer (DET) pathway of the EG-Ox-Cr(vi) through the acceleration effect of EG caused the majority removal of Cr(vi) under UV; (2) ·CO2 - generated from Ox photolysis was used to reduce some Cr(vi); (3) ·CO2 - created from Cr(vi)-Ox complexes in the solution through the photoinduced electron transfer (PET) pathway also reduced a little Cr(vi). Overall, the efficient removal of Cr(vi) by the EG + Ox + UV system provided new ideas for future research on Cr(vi) treatment.
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Affiliation(s)
- Ling Zhang
- School of Environmental and Chemical Engineering, Shanghai University 99 Shangda Road Shanghai 200444 PR China
| | - Yanqing Sun
- School of Environmental and Chemical Engineering, Shanghai University 99 Shangda Road Shanghai 200444 PR China
| | - Jie Sun
- School of Environmental and Chemical Engineering, Shanghai University 99 Shangda Road Shanghai 200444 PR China
| | - Fengming Cao
- School of Environmental and Chemical Engineering, Shanghai University 99 Shangda Road Shanghai 200444 PR China
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Zhai F, Luo Y, Zhang Y, Liao S, Cheng J, Meng X, Zeng Y, Wang X, Yang J, Yin J, Li L. Viscosity Simulation of Glass Microfiber and an Unusual Air Filter with High-Efficiency Antibacterial Functionality Enabled by ZnO/Graphene-Modified Glass Microfiber. ACS OMEGA 2022; 7:14211-14221. [PMID: 35559200 PMCID: PMC9089376 DOI: 10.1021/acsomega.2c00838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Accepted: 04/05/2022] [Indexed: 05/25/2023]
Abstract
The current global pandemic of new coronary pneumonia clearly reveals the importance of developing highly efficient filtration and fast germicidal performance of multifunctional air filters. In this study, a novel air filter with a controllable morphology based on the rod-like to flower-like zinc oxide/graphene-based photocatalytic composite particles loaded on glass microfiber was prepared by one-step microwave rapid synthesis. The multifunctional air filter shows the following special functions: the 10 mg·L-1 organic pollutant solution RhB was completely degraded within 2 h under a 500 W xenon lamp, and also 99% of Escherichia coli and Staphylococcus aureus were inactivated under a 60 W light-emitting diode lamp. Furthermore, after introducing the controllable morphology zinc oxide/graphene-based photocatalytic composite particles, the filtration efficiency of the multifunctional air filter was also kept at the same level (99.8%) as the one without any addition, indicating no loss of high-efficiency filtration while obtaining the rapid bactericidal function. The rapid antibacterial principle of the multifunctional air filter has also been proposed through the UV-vis spectroscopies, photoluminescence, and electron-spin resonance spectrum. The zinc oxide/graphene-based photocatalytic composite particles tightly coated on the glass microfiber surface could increase the active sites by changing the morphology of zinc oxide and, in the meantime, promote the separation of zinc oxide photo-generated electron-hole pairs to improve the rapid sterilization ability of the multifunctional air filters. In addition, an empirical formula to evaluate the relationship between the composition, viscosity, and viscosity modulus of glass microfiber was proposed by testing the viscosity of glass microfiber composed of 14 different compositions at 1300 and 1400 °C, which can be used as a criterion to evaluate the production technology of glass microfiber filters.
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Affiliation(s)
- Fuqiang Zhai
- Research
Institute for New Materials and Technology, Chongqing University of Arts and Sciences, Chongqing 402160, China
- Chongqing
Materials Research Institute Co., Ltd., Chongqing 400707, China
| | - Yongyi Luo
- School
of Materials and Energy, Southwest University, Chongqing 400715, China
| | - Yingchun Zhang
- College
of Pharmaceutical Sciences, Southwest University, Chongqing 402160, China
| | - Shichang Liao
- School
of Materials and Energy, Southwest University, Chongqing 400715, China
| | - Jiang Cheng
- Research
Institute for New Materials and Technology, Chongqing University of Arts and Sciences, Chongqing 402160, China
| | - Xiang Meng
- Research
Institute for New Materials and Technology, Chongqing University of Arts and Sciences, Chongqing 402160, China
| | - Yue Zeng
- College
of Pharmaceutical Sciences, Southwest University, Chongqing 402160, China
| | - Xinhui Wang
- College
of Pharmaceutical Sciences, Southwest University, Chongqing 402160, China
| | - Jinming Yang
- Chongqing
Zisun Technology Co., Ltd., Chongqing 401120, China
| | - Jiaqi Yin
- Beijing
Aerospace Smart Manufacturing Technology Development Co., Ltd., Beijing 100144, China
| | - Lu Li
- Research
Institute for New Materials and Technology, Chongqing University of Arts and Sciences, Chongqing 402160, China
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Ren J, Lv S, Wang S, Bao M, Zhang X, Gao Y, Liu Y, Zhang Z, Zeng L, Ke J. Construction of efficient g-C3N4/NH2-UiO-66 (Zr) heterojunction photocatalysts for wastewater purification. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.118973] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Azari A, Yeganeh M, Gholami M, Salari M. The superior adsorption capacity of 2,4-Dinitrophenol under ultrasound-assisted magnetic adsorption system: Modeling and process optimization by central composite design. JOURNAL OF HAZARDOUS MATERIALS 2021; 418:126348. [PMID: 34329032 DOI: 10.1016/j.jhazmat.2021.126348] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2021] [Revised: 05/17/2021] [Accepted: 06/04/2021] [Indexed: 06/13/2023]
Abstract
2,4-Dinitrophenol (DNP) was listed as a priority pollutant; accordingly, DNP-contaminated effluent must be treated before discharging to the receiving resources. In the present study, the hybrid ultrasound-assisted GO-Fe3O4 system was employed to decontaminate DNP solution. Ultrasound irradiation makes the mass transfer of adsorbate improved and Fe3O4 enables GO separation from liquid phase under external magnetic field. The as-synthesized GO-Fe3O4 composite was characterized by SEM, TEM, XRD, FTIR, BET and VSM. A response surface methodology based central composite design (RSM-CCD) was used to estimate and optimize of various variables on DNP removal percentage. Under optimal conditions (pH: 4.45, adsorbent dose: 0.178 g/L, ultrasound frequency: 40.02 kHz and DNP concentration: 50.10 mg/L, maximum adsorption capacity was calculated to be 425.58 mg/g for the ultrasound system, higher than the simple system 309.40 mg/g, indicating the importance of synergistic effect between the ultrasound waves and the adsorption process. The ultrasound-assisted adsorption system showed the better agreement with the Langmuir isotherm (R2 > 0.997), while the results of the stirring system were more consistent with the Freundlich model (R2 > 0.991). The experimental results indicated that the pseudo-second-order kinetic model well fitted by experiment data and rate constant was calculated to be 0.000148 min-1 and 0.000002 min-1 under ultrasound and silent systems, respectively. The rate of desorption under ultrasound was more favorable and reuse of the adsorbent in both systems after 10th consecutive cycles reduced by about 22%. Thermodynamic calculations also confirmed the endothermicity and spontaneity of both systems. Electrostatic attraction, hydrogen bonding, and π -π interactions played key roles during the adsorption of DNP onto the MGO. In conclusion, the outcomes of this study provide valuable information of the ultrasound-assisted GO-Fe3O4 system for practical applications.
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Affiliation(s)
- Ali Azari
- Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Mojtaba Yeganeh
- Research Center for Environmental Health Technology, Iran University of Medical Sciences, Tehran, Iran; Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran.
| | - Mitra Gholami
- Research Center for Environmental Health Technology, Iran University of Medical Sciences, Tehran, Iran; Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran.
| | - Mehdi Salari
- Department of Environmental Health Engineering, School of Public Health, Hamadan University of Medical Science, Hamadan, Iran
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