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Yue J, Li M, Ding N, Cheng S, Gao C. Effect of oxalic acid and sodium hydroxide on the desulfurization of coal using UV–H2O2 oxidation system. J Sulphur Chem 2021. [DOI: 10.1080/17415993.2021.1970166] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Jinsong Yue
- School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan, People’s Republic of China
| | - Mei Li
- School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan, People’s Republic of China
- Ningxia Key Laboratory of Solar Chemical conversion technology, North Minzu University, Yinchuan, People’s Republic of China
- Key Laboratory for Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan, People’s Republic of China
| | - Ning Ding
- School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan, People’s Republic of China
| | - Sidan Cheng
- School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan, People’s Republic of China
| | - Caiyun Gao
- School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan, People’s Republic of China
- Ningxia Key Laboratory of Solar Chemical conversion technology, North Minzu University, Yinchuan, People’s Republic of China
- Key Laboratory for Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan, People’s Republic of China
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2
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Shen Y, Hu Y, Wang M, Bao W, Chang L, Xie K. Speciation and thermal transformation of sulfur forms in high-sulfur coal and its utilization in coal-blending coking process: A review. Chin J Chem Eng 2021. [DOI: 10.1016/j.cjche.2021.04.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Silva LFO, Pinto D, Lima BD. Implications of iron nanoparticles in spontaneous coal combustion and the effects on climatic variables. CHEMOSPHERE 2020; 254:126814. [PMID: 32334262 DOI: 10.1016/j.chemosphere.2020.126814] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 04/04/2020] [Accepted: 04/14/2020] [Indexed: 06/11/2023]
Abstract
Atmosphere, water, and soil contamination with toxic compounds is a recurrent issue due to environmental disasters, coal burning, urbanization, and industrialization, allf of which have contributed to soil contamination over the decades. Consequently, understanding of the nanomineralogy and potential hazardous elements (PHEs) in coal area soil are always a vital topic since contaminated soil can affect the environment, agricultural safety, and human health. Colombian coal mining in the La Guajira zone has been usually been related with important health and ecological effects. Coalmine rejects from active and/or abandoned operations are causes of high intensities of potential hazardous elements (PHEs) and nanoparticles (NPs, minerals and/or amorphous compounds). Although these pollutants can be reduced by sorption to NPs, in this study was recognized an analytical procedure for understand distribution of PHEs and their relationship to iron NPs(Fe-NPs) was recognized. Non and poorrly crystalline Fe-NPs performances as the major PHEs association. This complex interaction is constant and efficient in resolving PHEs in proportions above monitoring quantities. The indefinite basis of PHEs in Colombian (La Guajira area) coalmine rejects sources results in years-long leaching of PHEs into rivers and drainages. The iron-clays and their great geomobility interfere the mitigating character that Fe hydr/oxides alone show through adsorption of PHEs and their control in spontaneous coal combustion (SCC) zones. This can have significant consequences to the probable availability of several pollutants (e.g. drinking water). The new results presented in this study add novel viewpoints into the description of Fe-NPs and its incidence in SCC areas. The methodology utilized in this work can be applied as a supplementary technique to evaluate the influence of coalmining actions on ecological and human health.
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Affiliation(s)
- Luis F O Silva
- Department of Civil and Environmental, Universidad de la Costa, CUC, Calle 58 # 55-66, Barranquilla, Atlántico, Colombia.
| | - Diana Pinto
- Department of Civil and Environmental, Universidad de la Costa, CUC, Calle 58 # 55-66, Barranquilla, Atlántico, Colombia.
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Silva LFO, Oliveira MLS, Gonçalves JO, Dotto GL. Identification of mercury and nanoparticles in roots with different oxidation states of an abandoned coal mine. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:24380-24386. [PMID: 32304064 DOI: 10.1007/s11356-020-08737-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2019] [Accepted: 04/02/2020] [Indexed: 06/11/2023]
Abstract
The morphology and composition of roots with different degrees of oxidation as a function of time were evaluated aiming to identify possible hazardous elements and nanoparticles. The roots were obtained from an abandoned coal mine located in the city of Criciúma, Santa Catarina, Brazil. From the roots, analyses were performed to identify nanoparticles (NPs) and ultrafine particles (UFPs), containing possible hazardous elements (PHEs) that cause potential environmental risks and impacts on human health. The identification of nanoscale materials requires greater robustness, so advanced integrated techniques have been used. The characterization of different types of roots was done by using focused ion beam (FIB), to evaluate nano-compound assemblies with high-resolution transmission electron microscopy/energy dispersive spectroscopy (HR-TEM/EDS). The results showed the presence of NPs containing Hg, Co, Cr, Ni, and V. The presence of these elements has increased consistently with the increase of C concentration in the roots, suggesting that the PHEs were gradually released from organic matter and inorganic minerals of coal. However, even with their decrease in roots, it was found that these elements still remained in the soil in significant quantities, even after 15 years of inactivation of the coal mine.
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Affiliation(s)
- Luis Felipe Oliveira Silva
- Department of Civil and Environmental, Universidad de la Costa, CUC, Calle 58 # 55-66, Barranquilla, Atlántico, Colombia.
| | - Marcos Leandro Silva Oliveira
- Department of Civil and Environmental, Universidad de la Costa, CUC, Calle 58 # 55-66, Barranquilla, Atlántico, Colombia
- IMED Southern College, 304, Passo Fundo, RS, 99070-220, Brazil
| | - Janaína Oliveira Gonçalves
- Chemical Engineering Department, Federal University of Santa Maria, UFSM, Roraima Avenue, 1000, Santa Maria, RS, 97105-900, Brazil.
| | - Guilherme Luiz Dotto
- Chemical Engineering Department, Federal University of Santa Maria, UFSM, Roraima Avenue, 1000, Santa Maria, RS, 97105-900, Brazil.
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Silva LFO, Crissien TJ, Milanes C, Sampaio CH. A three-dimensional nanoscale study in selected coal mine drainage. CHEMOSPHERE 2020; 248:125946. [PMID: 32014636 DOI: 10.1016/j.chemosphere.2020.125946] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Revised: 12/26/2019] [Accepted: 01/16/2020] [Indexed: 06/10/2023]
Abstract
Sediments from coal mine drainages (CMDs) contain large quantities of suspended pollutants (possibly numerous chemical substances) along with sulfates and hazardous elements (e.g., chromium, zinc, copper, lead) that irreversibly accumulate in the water. As this accumulation can continue for decades after discontinuation of coal extraction, it is necessary to employ multidisciplinary approaches to control the threat in such zones. The quantity of amorphous material in some CMDs was evaluated by X-ray powder diffraction (XRD) using the Rietveld-based SIROQUANT software package. Modern Dual Beam Focused Ion Beam (FIB), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscope (H-TEM), and energy-dispersive X-ray spectrometer (EDS) were used to evaluate the occurrence and transformation of nanophases (NPs). FIB is used to determine the 3D distribution of different species (internal structure) within individual NPs, whereas EDS is used to observe NP features (e.g., shape, constituent, range, assembly, and form of polymerization). The mineralogy of the sediment from the Brazilian CMDs, including the proportions of quartz, clays, Al-Fe-oxides, and amorphous NPs, appears to be related to the nature of the mineral matter in the relevant coal cleaning rejects (CCRs). The sediments of CMDs from the Brazilian coal area derived at a lower-pH range have different amorphous compositions as compared to those derived at a higher pH range. These special amorphous compositions are shown to be related to several other sediment properties such as particle surface area. The information gleaned in this study will be useful for further geochemical evaluation of CMDs in other parts of the world.
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Affiliation(s)
- Luis F O Silva
- Department of Civil and Environmental. Universidad de la Costa, CUC, Calle 58 # 55-66, Barranquilla, Atlántico, Colombia.
| | - Tito J Crissien
- Department of Civil and Environmental. Universidad de la Costa, CUC, Calle 58 # 55-66, Barranquilla, Atlántico, Colombia; Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Celene Milanes
- Department of Civil and Environmental. Universidad de la Costa, CUC, Calle 58 # 55-66, Barranquilla, Atlántico, Colombia
| | - Carlos H Sampaio
- Department d'Enginyeria Minera, Industrial i TIC, Serra Húnter Prof, Universitat Politècnica de Catalunya Barcelona Tech, Av. Bases de Manresa 61-63, Manresa, 08242, Barcelona, Spain
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Lin Y, Feng L, Li X, Chen Y, Yin G, Zhou W. Study on ultrasound-assisted oxidative desulfurization for crude oil. ULTRASONICS SONOCHEMISTRY 2020; 63:104946. [PMID: 31945567 DOI: 10.1016/j.ultsonch.2019.104946] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 12/18/2019] [Accepted: 12/24/2019] [Indexed: 05/12/2023]
Abstract
The existence of sulfur compounds in crude oil will bring many problems such as corrosion, catalyst poisoning and pollution to the petroleum processing process. Therefore, how to reduce the sulfur content as much as possible in the process of crude oil processing has become an important research topic in the petroleum processing industry. In this paper, ultrasonic-oxidative desulfurization is studied. The effects of reaction temperature, reaction time, amount of oxidant and demulsifier on desulfurization rate are investigated. And the effect of oxidative desulfurization and single oxidative desulfurization under ultrasonic treatment are compared. It is found that the addition of ultrasonic treatment can enhance the desulfurization effect of desulfurizer, the desulfurization efficiency can be increased by about 10% under ultrasonic treatment (100 W, 70 kHz); ultrasonic wave plays an auxiliary role in the system, it can promote heterogeneous reactions, improve the activity of oxidants, and promote the degradation of macromolecular compounds. Finally, physical desulfurization, chemical desulfurization and biological desulfurization technologies are compared.
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Affiliation(s)
- Yinhe Lin
- Institute of Chemical Engineering, Yangtze Normal University, Chongqing 408100, China; Energy and Environment Engineering Institute, Nanchang Institute of Technology, Nanchang 330000, China
| | - Li Feng
- School of Civil and Transportation Engineering, Guangdong University of Technology, No 100, Waihuan Xi Road, Guangzhou, Higher Education Mega Center, Panyu District, Guangzhou 510006, Guangdong, China.
| | - Xuhao Li
- School of Civil and Transportation Engineering, Guangdong University of Technology, No 100, Waihuan Xi Road, Guangzhou, Higher Education Mega Center, Panyu District, Guangzhou 510006, Guangdong, China
| | - Yuning Chen
- School of Civil and Transportation Engineering, Guangdong University of Technology, No 100, Waihuan Xi Road, Guangzhou, Higher Education Mega Center, Panyu District, Guangzhou 510006, Guangdong, China
| | - Guoliang Yin
- Chemistry and Chemical Engineering College, Yinbin University, Yibin 644007, China
| | - Wen Zhou
- The Second Clinical College of Guangzhou University of Chinese Medicine (Guangdong Provincial Academy of Chinese Medical Sciences), 55 Neihuanxi Road, Guangzhou 510006, China
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Chen Y, Truong VNT, Bu X, Xie G. A review of effects and applications of ultrasound in mineral flotation. ULTRASONICS SONOCHEMISTRY 2020; 60:104739. [PMID: 31557697 DOI: 10.1016/j.ultsonch.2019.104739] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 08/04/2019] [Accepted: 08/19/2019] [Indexed: 05/06/2023]
Abstract
Ultrasound technology is widely applied in the flotation process. From the perspective of the theory of ultrasound, this article explains the effects and applications of ultrasound in the flotation process. To obtain a clear understanding of ultrasonic effects, we observe the phenomena of ultrasound using a high-speed camera and a CCD camera, and investigate potential applications in flotation. From these different phenomena, the ultrasonic effects are classified into three types of effect: the transient cavitation effect, stable cavitation effect, and acoustic radiation force effect. Based on these effects, the applications of ultrasound to mineral flotation are reviewed, including slime coating removal, oxidation film removal, desulfuration, tiny bubble generation, flotation reagent dispersion, and aggregation. In addition, the ultrasonic equipment and treatment methods applied in flotation are classified and compared based on their characteristics. Finally, we propose some potential directions in the study of the stable cavitation effect and acoustic radiation force effect, which are important, but are seldom mentioned in previous reports.
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Affiliation(s)
- Yuran Chen
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
| | - Vu N T Truong
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Xiangning Bu
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China.
| | - Guangyuan Xie
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China.
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Oliveira MLS, Ramirez O, Schneider IL, Teixeira EC, Silva LFO. A realistic study of 3D composition of carbon nanotubes and carbonaceous nanocompounds from different soils around coal power plant. CHEMOSPHERE 2019; 237:124534. [PMID: 31549651 DOI: 10.1016/j.chemosphere.2019.124534] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2019] [Revised: 07/10/2019] [Accepted: 08/06/2019] [Indexed: 06/10/2023]
Abstract
Information on the effects of multi-walled carbon nanotubes (MWCNTs) on topsoil around coal power plants (CPPs) is still very limited. In the present work, the influences of MWCNTs on potential hazardous elements (PHEs) and environmental carbonaceous compounds in agrarian topsoil around CPPs of Latin America were investigated. The environmentally elevated proportions of MWCNTs and PHEs can cause damage to developing a fetus. The ecological impacts of industrial energy byproducts generated by MWCNTs were also studied. The surface morphologies of MWCNTs and PHEs detected in topsoil samples were analyzed by advanced electron microscopy in a combination of energy dispersive X-ray spectroscopy (EDS). The alterations could be originated due to the different geophysical constituents and superficial structure, which in turn disturbed their geoavailability in studied topsoil. It was found that a large amount of MWCNTs and amorphous carbonaceous matters, which are responsible for adsorbing PHEs, existed in soils around CPPs. Hence, these findings could be used to better understand the geochemical properties of PHEs near CPPs.
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Affiliation(s)
- Marcos L S Oliveira
- Department of Civil and Environmental, Universidad de la Costa, CUC, Calle 58 # 55-66, Barranquilla, Atlántico, Colombia; Faculdade Meridional IMED, 304- Passo Fundo, RS 99070-220, Brazil
| | - Omar Ramirez
- Department of Civil and Environmental, Universidad de la Costa, CUC, Calle 58 # 55-66, Barranquilla, Atlántico, Colombia
| | - Ismael L Schneider
- Department of Civil and Environmental, Universidad de la Costa, CUC, Calle 58 # 55-66, Barranquilla, Atlántico, Colombia
| | - Elba C Teixeira
- Universidade do Vale do Rio do Sinos, Av. Unisinos, 950-Cristo Rei, RS, 93022-000, Brazil
| | - Luis F O Silva
- Department of Civil and Environmental, Universidad de la Costa, CUC, Calle 58 # 55-66, Barranquilla, Atlántico, Colombia; Universidade do Vale do Rio do Sinos, Av. Unisinos, 950-Cristo Rei, RS, 93022-000, Brazil.
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11
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Rahimi M, Shahhosseini S, Sobati MA, Movahedirad S, Khodaei B, Hassanzadeh H. A novel multi-probe continuous flow ultrasound assisted oxidative desulfurization reactor; experimental investigation and simulation. ULTRASONICS SONOCHEMISTRY 2019; 56:264-273. [PMID: 31101262 DOI: 10.1016/j.ultsonch.2019.04.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 04/08/2019] [Accepted: 04/10/2019] [Indexed: 06/09/2023]
Abstract
In this work, a cylindrical multi-probe continuous flow system with different injection strategies was exploited to study ultrasound assisted oxidative desulfurization process. The effects of nozzle number, nozzle diameter, ultrasonic power and volumetric flow rate (residence time) on the desulfurization efficiency of the diesel fuel were investigated. It was found that the sulfur removal increases by increasing the nozzle diameter when the flow rate is fixed. Sulfur removal was increased by increasing the residence time, for all types of the nozzles. Injection of the aqueous phase below the horn tip in the active zone provides the conditions by which the higher interfacial area between the phases and thus greater conversion rate can be obtained. The results indicated that over 97% sulfur removal was achieved using the double-nozzle injection with nozzle diameter of 1.5 mm, residence time of 15 min, electrical power of 277.2 W and volumetric flow rates of the aqueous and oil phases 48.89 and 244.44 mL/min, respectively. The simulation results showed that choosing a proper injection strategy has an impact on the hydrodynamic and flow pattern induced by ultrasonic field and in turn could effectively influence the mixing of the two-immiscible phases. A more uniform distribution of the aqueous-phase volume fraction was observed in the system with double-nozzle injection in comparison with the single nozzle injection.
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Affiliation(s)
- Masoud Rahimi
- Process Simulation and Control Research Laboratory, School of Chemical Engineering, Iran University of Science and Technology, 16846 Tehran, Iran; School of Chemical Engineering, Iran University of Science and Technology, P.O. Box 16765-163, Tehran, Iran
| | - Shahrokh Shahhosseini
- Process Simulation and Control Research Laboratory, School of Chemical Engineering, Iran University of Science and Technology, 16846 Tehran, Iran; School of Chemical Engineering, Iran University of Science and Technology, P.O. Box 16765-163, Tehran, Iran.
| | - Mohammad Amin Sobati
- Process Simulation and Control Research Laboratory, School of Chemical Engineering, Iran University of Science and Technology, 16846 Tehran, Iran; School of Chemical Engineering, Iran University of Science and Technology, P.O. Box 16765-163, Tehran, Iran
| | - Salman Movahedirad
- Process Simulation and Control Research Laboratory, School of Chemical Engineering, Iran University of Science and Technology, 16846 Tehran, Iran; School of Chemical Engineering, Iran University of Science and Technology, P.O. Box 16765-163, Tehran, Iran
| | - Behrang Khodaei
- Process Simulation and Control Research Laboratory, School of Chemical Engineering, Iran University of Science and Technology, 16846 Tehran, Iran; School of Chemical Engineering, Iran University of Science and Technology, P.O. Box 16765-163, Tehran, Iran
| | - Hossein Hassanzadeh
- Process Simulation and Control Research Laboratory, School of Chemical Engineering, Iran University of Science and Technology, 16846 Tehran, Iran; School of Chemical Engineering, Iran University of Science and Technology, P.O. Box 16765-163, Tehran, Iran
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Barma SD. Ultrasonic-assisted coal beneficiation: A review. ULTRASONICS SONOCHEMISTRY 2019; 50:15-35. [PMID: 30122465 DOI: 10.1016/j.ultsonch.2018.08.016] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2018] [Revised: 07/27/2018] [Accepted: 08/11/2018] [Indexed: 05/16/2023]
Abstract
Limited availability and large industrial demands of high-grade coals have forced many coal-dependent industries to shift their preference towards low-grade coals to meet the feedstock requirements. The low-grade coals due to their poor washability nature do not respond efficiently toward existing coal beneficiation techniques, making the cleaning process challenging. Inefficient cleaning of such coals could potentially lead to environmental problems such as solid waste generation and gaseous emissions during combustion. Therefore, it is important to upgrade the existing coal beneficiation techniques for improving the clean coal quality, and simultaneously enhance the efficiency of the process. In the past few decades, many techniques have been developed to improve existing coal beneficiation techniques. Among them, ultrasound technology has gained significant attention due to its ability to enhance the process performance. The incorporation of ultrasound can significantly increase the clean coal yield under the substantial effect of cavitation and streaming. In this paper, an overview on the recent development in ultrasonic-based coal beneficiation techniques and the role of ultrasound in improving the efficiency of various coal beneficiation techniques are discussed. This includes a critical review of the ultrasound mechanism in enhancing coal demineralization, desulphurization, grindability, slurryability and dewatering.
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Affiliation(s)
- Santosh Deb Barma
- Mineral Processing Department, CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, Odisha 751013, India.
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Khan MS, Khalid M, Ahmad MS, Ahmad M, Ashafaq M, Rahisuddin, Arif R, Shahid M. Synthesis, spectral and crystallographic study, DNA binding and molecular docking studies of homo dinuclear Co(II) and Ni(II) complexes. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.08.048] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Tang Q, Sheng W, Li L, Zheng L, Miao C, Sun R. Alteration behavior of mineral structure and hazardous elements during combustion of coal from a power plant at Huainan, Anhui, China. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 239:768-776. [PMID: 29729618 DOI: 10.1016/j.envpol.2018.04.115] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Revised: 04/22/2018] [Accepted: 04/24/2018] [Indexed: 06/08/2023]
Abstract
The alteration behavior of minerals and hazardous elements during simulated combustion (100-1200 °C) of a raw coal collected from a power plant were studied. Thermogravimetric analysis indicated that there were mainly four alteration stages during coal combustion. The transformation behavior of mineral phases of raw coal, which were detected by X-ray polycrystalline diffraction (XRD) technique, mainly relied on the combustion temperature. A series of changes were derived from the intensities of mineral (e.g. clays) diffraction peaks when temperature surpassed 600 °C. Mineral phases tended to be simple and collapsed to amorphous glass when temperature reached up to 1200 °C. The characteristics of functional groups for raw coal and high-temperature (1200 °C) ash studied by Fourier transform infrared spectroscopy (FTIR) were in accordance with the result obtained from XRD analysis. The volatilization ratios of Co, Cr, Ni and V increased consistently with the increase of combustion temperature, suggesting these elements were gradually released from the organic matter and inorganic minerals of coal.
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Affiliation(s)
- Quan Tang
- School of Life Sciences, Anhui University, Hefei, 230601, China.
| | - Wanqi Sheng
- School of Resource and Environment Engineering, Anhui University, Hefei, 230601, China
| | - Liyuan Li
- School of Resource and Environment Engineering, Anhui University, Hefei, 230601, China
| | - Liugen Zheng
- School of Resource and Environment Engineering, Anhui University, Hefei, 230601, China
| | - Chunhui Miao
- State Grid Anhui Electric Power Research Institute, Hefei, 230601, China
| | - Ruoyu Sun
- Institute of Surface-Earth System Science, Tianjin University, Tianjin, 300072, China.
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15
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Dmitrienko MA, Strizhak PA. Coal-water slurries containing petrochemicals to solve problems of air pollution by coal thermal power stations and boiler plants: An introductory review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 613-614:1117-1129. [PMID: 28954373 DOI: 10.1016/j.scitotenv.2017.09.189] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Revised: 09/16/2017] [Accepted: 09/18/2017] [Indexed: 06/07/2023]
Abstract
This introductory study presents the analysis of the environmental, economic and energy performance indicators of burning high-potential coal water slurries containing petrochemicals (CWSP) instead of coal, fuel oil, and natural gas at typical thermal power stations (TPS) and a boiler plant. We focus on the most hazardous anthropogenic emissions of coal power industry: sulfur and nitrogen oxides. The research findings show that these emissions may be several times lower if coal and oil processing wastes are mixed with water as compared to the combustion of traditional pulverized coal, even of high grades. The study focuses on wastes, such as filter cakes, oil sludge, waste industrial oils, heavy coal-tar products, resins, etc., that are produced and stored in abundance. Their deep conversion is very rare due to low economic benefit. Effective ways are necessary to recover such industrial wastes. We present the cost assessment of the changes to the heat and power generation technologies that are required from typical power plants for switching from coal, fuel oil and natural gas to CWSPs based on coal and oil processing wastes. The corresponding technological changes pay off after a short time, ranging from several months to several years. The most promising components for CWSP production have been identified, which provide payback within a year. Among these are filter cakes (coal processing wastes), which are produced as a ready-made coal-water slurry fuel (a mixture of flocculants, water, and fine coal dust). These fuels have the least impact on the environment in terms of the emissions of sulfur and nitrogen oxides as well as fly ash. An important conclusion of the study is that using CWSPs based on filter cakes is worthwhile both as the main fuel for thermal power stations and boiler plants and as starting fuel.
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Affiliation(s)
| | - Pavel A Strizhak
- National Research Tomsk Polytechnic University, Tomsk 634050, Russia.
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16
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Removal of sulfur by adding zinc during the digestion process of high-sulfur bauxite. Sci Rep 2017; 7:17181. [PMID: 29215060 PMCID: PMC5719395 DOI: 10.1038/s41598-017-17499-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Accepted: 11/27/2017] [Indexed: 11/08/2022] Open
Abstract
This paper proposes a novel approach to sulfur removal by adding zinc during the digestion process. The effects of zinc dosage on the concentrations of different valence sulfur in sodium aluminate solution were investigated at length to find that high-valence sulfur (S2O32−, SO32−, SO42−) concentration in sodium aluminate solution decreases, but the concentration of the S2− in the sodium aluminate solution increases as zinc dosage increases. This suggests that zinc can react with high-valence sulfur to generate S2− at digestion temperature, which is consistent with our thermodynamic calculation results. In this study, as zinc dosage increases, sulfur digestion rate decreases while sulfur content in red mud markedly increases when zinc dosage was below 4%; the digestion rates of sulfur and sulfur content in red mud remains stable when zinc dosage was above 4%; the alumina digestion rate, conversely, increased slightly throughout the experiment. This suggests that high-valence sulfur in sodium aluminate solution can be converted to S2− and then enter red mud to be removed completely by adding zinc during the digestion process.
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17
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Larichev YV, Koskin AP. Effect of vanadium compounds on the sulfonation of carbon materials. KINETICS AND CATALYSIS 2017. [DOI: 10.1134/s0023158417050159] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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18
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Assessment of catalytic activities of selected iron hydroxysulphates biosynthesized using Acidithiobacillus ferrooxidans for the degradation of phenol in heterogeneous Fenton-like reactions. Sep Purif Technol 2017. [DOI: 10.1016/j.seppur.2017.05.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Mketo N, Nomngongo PN, Ngila JC. Rapid total sulphur reduction in coal samples using various dilute alkaline leaching reagents under microwave heating: preventing sulphur emissions during coal processing. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:19852-19858. [PMID: 28687993 DOI: 10.1007/s11356-017-9632-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Accepted: 06/26/2017] [Indexed: 06/07/2023]
Abstract
Currently in South Africa, online flue gas desulphurisation (FGD) is being utilized as one of the most effective methods for total sulphur reduction in coal samples during the combustion process. However, the main disadvantage associated with FGD is the formation of its by-products (FGD gypsum). The latter is mostly formed in low grade quality, thereby bringing secondary pollution problems and extra disposal costs. Therefore, the current study describes the development of total sulphur extraction in coal under microwave heating using different dilute alkaline solutions such as NaOH, NaOH-H2O2, NH4OH, and NH4OH-H2O2. The experimental conditions were as follows: 150 °C, 5 min and 10% (m/v or v/v) for temperature, extraction time and reagent concentration, respectively. The most effective alkaline reagent for coal desulphurisation was observed to be NaOH-H2O2 with total sulphur reduction of 55% (from the inductively coupled plasma-optical emission spectrometry (ICP-OES) results). The NaOH-H2O2 reagent also showed significant morphological changes in coal as observed from the SEM images and effective demineralisation as revealed by the powder X-ray diffractometer (P-XRD) results. Additionally, desulphurisation results obtained from the developed microwave-assisted dilute alkaline extraction (MW-ADAE) method were quite comparable with the published work. The proposed total sulphur reduction method is advantageous as compared to some of the literature reported coal desulphurisation methods as it requires a short period (5 min) of time to reach its completion. Additionally, the proposed method shows excellent reproducibility (% RSD from 0.5 to 1); therefore, it can be utilized for routine analysis. Graphical abstract ᅟ.
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Affiliation(s)
- Nomvano Mketo
- Analytical Facility, University of Johannesburg, PO Box 524, Auckland Park, Johannesburg, 2006, South Africa.
- Department of Applied Chemistry, University of Johannesburg, PO Box 17011, Doornfontein, Johannesburg, 2028, South Africa.
| | - Philiswa Nosizo Nomngongo
- Department of Applied Chemistry, University of Johannesburg, PO Box 17011, Doornfontein, Johannesburg, 2028, South Africa
| | - Jane Catherine Ngila
- Department of Applied Chemistry, University of Johannesburg, PO Box 17011, Doornfontein, Johannesburg, 2028, South Africa
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Sricharoen P, Limchoowong N, Areerob Y, Nuengmatcha P, Techawongstien S, Chanthai S. Fe 3O 4/hydroxyapatite/graphene quantum dots as a novel nano-sorbent for preconcentration of copper residue in Thai food ingredients: Optimization of ultrasound-assisted magnetic solid phase extraction. ULTRASONICS SONOCHEMISTRY 2017; 37:83-93. [PMID: 28427685 DOI: 10.1016/j.ultsonch.2016.12.037] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2016] [Revised: 12/28/2016] [Accepted: 12/28/2016] [Indexed: 05/24/2023]
Abstract
Fe3O4/hydroxyapatite/graphene quantum dots (Fe3O4/HAP/GQDs) nanocomposite was synthesized and used as a novel magnetic adsorbent. This nanocomposite was characterized using scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, and magnetization property. The Fe3O4/HAP/GQDs was applied to pre-concentrate copper residues in Thai food ingredients (so-called "Tom Yum Kung") prior to determination by inductively coupled plasma-atomic emission spectrometry. Based on ultrasound-assisted extraction optimization, various parameters affecting the magnetic solid-phase extraction, such as solution pH, amount of magnetic nanoparticles, adsorption and desorption time, and type of elution solvent and its concentration were evaluated. Under optimal conditions, the linear range was 0.05-1500ngmL-1 (R2>0.999), limit of detection was 0.58ngmL-1, and limit of quantification was 1.94ngmL-1. The precision, expressed as the relative standard deviation of the calibration curve slope (n=5), for intra-day and inter-day analyses was 0.87% and 4.47%, respectively. The recovery study of Cu for real samples was ranged between 83.5% and 104.8%. This approach gave the enrichment factor of 39.2, which guarantees trace analysis of Cu residues. Therefore, Fe3O4/HAP/GQDs can be a potential and suitable candidate for the pre-concentration and separation of Cu from food samples. It can easily be reused after treatment with deionized water.
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Affiliation(s)
- Phitchan Sricharoen
- Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Nunticha Limchoowong
- Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Yonrapach Areerob
- Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Prawit Nuengmatcha
- Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand; Department of Chemistry, Faculty of Science and Technology, Nakhon Si Thammarat Rajabhat University, Nakhon Si Thammarat 80280, Thailand
| | - Suchila Techawongstien
- Department of Plant Science and Agricultural Resources, Faculty of Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Saksit Chanthai
- Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand.
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Xia D, Ye H, Xie Y, Yang C, Chen M, Dang Z, Yi X, Lu G. Isotope geochemistry, hydrochemistry, and mineralogy of a river affected by acid mine drainage in a mining area, South China. RSC Adv 2017. [DOI: 10.1039/c7ra07809a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This work utilized stable isotopes to evaluate the processes that affect the sulfate content in the waters of an AMD-affected river.
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Affiliation(s)
- Di Xia
- School of Environment and Energy
- South China University of Technology
- Guangzhou 510006
- China
| | - Han Ye
- School of Environment and Energy
- South China University of Technology
- Guangzhou 510006
- China
| | - Yingying Xie
- School of Environment and Energy
- South China University of Technology
- Guangzhou 510006
- China
| | - Chengfang Yang
- School of Environment and Energy
- South China University of Technology
- Guangzhou 510006
- China
| | - Meiqin Chen
- School of Environmental and Biological Engineering
- Guangdong University of Petrochemical Technology
- Maoming 525000
- China
| | - Zhi Dang
- School of Environment and Energy
- South China University of Technology
- Guangzhou 510006
- China
- The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters
| | - Xiaoyun Yi
- School of Environment and Energy
- South China University of Technology
- Guangzhou 510006
- China
- The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters
| | - Guining Lu
- School of Environment and Energy
- South China University of Technology
- Guangzhou 510006
- China
- Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal
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