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Huang S, Fu Y, Zhang H, Wang C, Zou C, Lu X. Research progress of novel bio-denitrification technology in deep wastewater treatment. Front Microbiol 2023; 14:1284369. [PMID: 37860138 PMCID: PMC10582329 DOI: 10.3389/fmicb.2023.1284369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 09/20/2023] [Indexed: 10/21/2023] Open
Abstract
Excessive nitrogen emissions are a major contributor to water pollution, posing a threat not only to the environment but also to human health. Therefore, achieving deep denitrification of wastewater is of significant importance. Traditional biological denitrification methods have some drawbacks, including long processing times, substantial land requirements, high energy consumption, and high investment and operational costs. In contrast, the novel bio-denitrification technology reduces the traditional processing time and lowers operational and maintenance costs while improving denitrification efficiency. This technology falls within the category of environmentally friendly, low-energy deep denitrification methods. This paper introduces several innovative bio-denitrification technologies and their combinations, conducts a comparative analysis of their denitrification efficiency across various wastewater types, and concludes by outlining the future prospects for the development of these novel bio-denitrification technologies.
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Affiliation(s)
| | | | | | | | | | - Xiuguo Lu
- School of Civil Engineering and Architecture, East China Jiao Tong University, Nanchang, China
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2
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Xing J, Qi Z, Dong W, Chen Q, Wu M, Yi P, Pan B, Xing B. Aggregation of biochar nanoparticles and the impact on bisphenol A sorption: Experiments and molecular dynamics simulations. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 875:162724. [PMID: 36906025 DOI: 10.1016/j.scitotenv.2023.162724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 03/03/2023] [Accepted: 03/04/2023] [Indexed: 06/18/2023]
Abstract
The unique properties and environmental implications of biochar nanoparticles (BNPs) have attracted increasing attention. The abundant functional groups and aromatic structures in BNPs may promote the aggregation of BNPs, but the mechanism and implications of this aggregation process remain unclear. Thus, this study investigated the aggregation of BNPs and the sorption of bisphenol A (BPA) on BNPs by combining experimental investigations with molecular dynamics simulations. As the concentration of BNP increased from 100 mg/L to 500 mg/L, the particle size increased from approximately 200 nm to 500 nm, and the exposed surface area ratio in the aqueous phase decreased from 0.46 to 0.05, which confirmed the aggregation of BNPs. The sorption of BPA on BNPs decreased with increasing BNP concentration in both the experiments and molecular dynamics simulations because of BNP aggregation. According to a detailed analysis of the BPA molecules adsorbed on BNP aggregates, the sorption mechanisms were hydrogen bonding, hydrophobic effect, and π-π interactions, which were driven by aromatic rings and O- and N-containing functional groups. The aggregation of BNPs embedded some functional groups in the aggregates and thus inhibited sorption. Interestingly, the steady configuration of the BNP aggregates in the molecular dynamics simulations (2000 ps relaxation) also determined the apparent BPA sorption. BPA molecules were adsorbed in the V-shaped interlayers of the BNP aggregates that acted as semi-closed pores, but could not be adsorbed in the parallel interlayers because of their small layer spacing. This study can provide theoretical guidance for the application of BNPs in pollution control and remediation.
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Affiliation(s)
- Jing Xing
- Yunnan Provincial Key Lab of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, Yunnan, China
| | - Zhaoxiong Qi
- Yunnan Provincial Key Lab of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, Yunnan, China
| | - Wei Dong
- Yunnan Provincial Key Lab of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, Yunnan, China
| | - Quan Chen
- Yunnan Provincial Key Lab of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, Yunnan, China.
| | - Min Wu
- Yunnan Provincial Key Lab of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, Yunnan, China
| | - Peng Yi
- Yunnan Provincial Key Lab of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, Yunnan, China
| | - Bo Pan
- Yunnan Provincial Key Lab of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, Yunnan, China
| | - Baoshan Xing
- Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003, United States
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3
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Chang PH, Mukhopadhyay R, Chen CY, Sarkar B, Li J, Tzou YM. A mechanistic insight into the shrinkage and swelling of Ca-montmorillonite upon adsorption of chain-like ranitidine in an aqueous system. J Colloid Interface Sci 2023; 633:979-991. [PMID: 36509040 DOI: 10.1016/j.jcis.2022.11.104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Revised: 11/17/2022] [Accepted: 11/19/2022] [Indexed: 11/30/2022]
Abstract
Adsorption behavior of ranitidine hydrochloride (RT) on a Ca-montmorillonite (SAz-1) was studied in aqueous system through batch experiments. The adsorption kinetics revealed that the equilibrium reached within 0.25 h and the data fitted well to the pseudo-second order kinetic equation (R2 = 0.98). The maximum RT adsorption capacity of SAz-1 was 369.2 mg/g and the adsorption isotherm data followed the Langmuir model (R2 = 0.99). The adsorption of RT and desorption of exchangeable cations from the clay mineral were linearly correlated, suggesting that cation exchange was the dominant mechanism of RT adsorption. The XRD examination of RT-adsorbed SAz-1 samples (unsaturated/saturated) after heating enabled the calculation of RT occupied area in the interlayer of the clay mineral. The results suggested that adsorbed-RT at low loading rate could lay on the internal surfaces in a free style to reduce the basal spacing (d001 value) of SAz-1. When the RT loading rate was increased, a limited surface space enforced more RT molecules to lay in a tilted style and caused interlayer swelling of SAz-1 increasing the d001 value. The trend of rising decomposition temperature of RT with increasing RT loading rates confirmed intercalation of RT molecules in SAz-1. Infrared spectral analysis revealed the participation of amide and furan groups of RT in binding between RT and SAz-1. Thus, this study indicated that SAz-1 is an efficient adsorbent to remove RT from contaminated water, and the chain-like molecular structure of RT could cause an irregular change in the basal spacing of swelling type clay minerals.
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Affiliation(s)
- Po-Hsiang Chang
- College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, PR China.
| | - Raj Mukhopadhyay
- Division of Irrigation and Drainage Engineering, ICAR-Central Soil Salinity Research Institute, Karnal - 132001, Haryana, India
| | - Chien-Yen Chen
- Department of Earth and Environmental Sciences, National Chung Cheng University, Chia-Yi 621, Taiwan
| | - Binoy Sarkar
- Future Industries Institute, University of South Australia, Mawson Lakes, SA 5095, Australia
| | - Jiwei Li
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, 28 Xianning West Road, Xi'an, Shaanxi 710049, PR China
| | - Yu-Min Tzou
- Department of Soil and Environmental Sciences, National Chung Hsing University, 145 Xingda Rd., Taichung 40227, Taiwan; Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, 145 Xingda Rd., Taichung 40227, Taiwan.
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4
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α-Hydroxy acids modified β-cyclodextrin capped iron nanocatalyst for rapid reduction of nitroaromatics: A sonochemical approach. Int J Biol Macromol 2022; 209:1504-1515. [PMID: 35469942 DOI: 10.1016/j.ijbiomac.2022.04.149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2022] [Revised: 04/19/2022] [Accepted: 04/19/2022] [Indexed: 11/21/2022]
Abstract
This study reports a sonochemical approach for the synthesis and catalytic performance of zerovalent iron nanoparticles (nZVI) capped with two cyclodextrin (CD) crosslinked polymers derived from Lactic acid and Citric acid (CDLA and CDCA respectively). The polymers and the catalysts were characterized by NMR, FTIR, HRTEM, DLS, Zeta potential, FESEM, EDAX, VSM, XRD, XPS, TGA analysis. The catalysts proved to be sustainable and recyclable for rapid sonochemical reduction of nitroaromatics under ambient conditions. The isolated yield of the derivatives was found to be greater than 90%. The results suggest excellent dispersibility, stability, high iron content and smaller size of CDLA polymer capped nZVI compared to CDCA capped nZVI, leading to two-fold higher catalytic activity. The effect of various crucial catalysis parameters was investigated and optimized. The scope of the reaction was extended to other nitroaromatics under the optimized conditions. Being magnetically separable, the cost effective and non-toxic catalysts exhibited high recycling efficiency (~13 cycles), high turnover number (TON) and turnover frequency (TOF). The recyclable catalysts could be low-cost and sustainable options for organic transformation in water via sonochemical approach in aqueous medium.
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Guo F, Liu Q, Sha J, Cao Z, Chong Y, Li Y, Li T, Ren B. Solubility, thermodynamic properties, Hansen solubility parameter, and molecular simulation of amitriptyline hydrochloride (Form I) in fourteen organic pure solvents at different temperatures. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116896] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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6
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Feng N, She S, Hu H, Tang S, Tan J, Wu Q, Xiao J. Effects of Oligomeric Procyanidins From Lotus Seedpod on the Retrogradation Properties of Rice Starch. Front Nutr 2021; 8:751627. [PMID: 34631776 PMCID: PMC8494198 DOI: 10.3389/fnut.2021.751627] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Accepted: 08/23/2021] [Indexed: 11/16/2022] Open
Abstract
The extent of retrogradation strongly affects certain physical and cooking properties of rice starch (RS), which are important to consumers. In this study, oligomeric procyanidins from lotus seedpod (LSOPC) was prepared and used to investigate its inhibitory effect on RS retrogradation. Various structural changes of RS during retrogradation were characterized by differential scanning calorimetry, low field nuclear magnetic resonance, X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy. The results showed LSOPC could effectively retard both short- and long-term retrogradation of RS, and its inhibitory effect was dependent on the administered concentration of LSOPC. Molecule simulation revealed the interactions of RS and LSOPC, which indicated that the competition of hydrogen bonds between RS and LSOPC was the critical factor for anti-retrogradation. This inhibitory effect and mechanism of action of LSOPC could promote its applications in the field of starch anti-retrogradation.
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Affiliation(s)
- Nianjie Feng
- Key Laboratory of Fermentation Engineering, Ministry of Education, Hubei Key Laboratory of Industrial Microbiology, National “111” Center for Cellular Regulation and Molecular Pharmaceutics, Hubei Research Center of Food Fermentation Engineering and Technology, Hubei University of Technology, Wuhan, China
| | - Shaowen She
- Key Laboratory of Fermentation Engineering, Ministry of Education, Hubei Key Laboratory of Industrial Microbiology, National “111” Center for Cellular Regulation and Molecular Pharmaceutics, Hubei Research Center of Food Fermentation Engineering and Technology, Hubei University of Technology, Wuhan, China
| | - Hengfeng Hu
- J.S Corrugating Machinery Co. Ltd, Wuhan, China
| | - Shimiao Tang
- Key Laboratory of Fermentation Engineering, Ministry of Education, Hubei Key Laboratory of Industrial Microbiology, National “111” Center for Cellular Regulation and Molecular Pharmaceutics, Hubei Research Center of Food Fermentation Engineering and Technology, Hubei University of Technology, Wuhan, China
| | - Jiangying Tan
- Key Laboratory of Fermentation Engineering, Ministry of Education, Hubei Key Laboratory of Industrial Microbiology, National “111” Center for Cellular Regulation and Molecular Pharmaceutics, Hubei Research Center of Food Fermentation Engineering and Technology, Hubei University of Technology, Wuhan, China
| | - Qian Wu
- Key Laboratory of Fermentation Engineering, Ministry of Education, Hubei Key Laboratory of Industrial Microbiology, National “111” Center for Cellular Regulation and Molecular Pharmaceutics, Hubei Research Center of Food Fermentation Engineering and Technology, Hubei University of Technology, Wuhan, China
| | - Juan Xiao
- State Key Laboratory of Marine Resource Utilization in South China Sea/Ministry of Education, Key Laboratory of Food Nutrition and Functional Food of Hainan Province/Engineering Research Center of Utilization of Tropical Polysaccharide Resources/School of Food Science and Engineering, Hainan University, Haikou, China
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7
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Alvarado N, Abarca RL, Linares-Flores C. Two Fascinating Polysaccharides: Chitosan and Starch. Some Prominent Characterizations for Applying as Eco-Friendly Food Packaging and Pollutant Remover in Aqueous Medium. Progress in Recent Years: A Review. Polymers (Basel) 2021; 13:1737. [PMID: 34073343 PMCID: PMC8198307 DOI: 10.3390/polym13111737] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 05/17/2021] [Accepted: 05/19/2021] [Indexed: 11/17/2022] Open
Abstract
The call to use biodegradable, eco-friendly materials is urgent. The use of biopolymers as a replacement for the classic petroleum-based materials is increasing. Chitosan and starch have been widely studied with this purpose: to be part of this replacement. The importance of proper physical characterization of these biopolymers is essential for the intended application. This review focuses on characterizations of chitosan and starch, approximately from 2017 to date, in one of their most-used applications: food packaging for chitosan and as an adsorbent agent of pollutants in aqueous medium for starch.
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Affiliation(s)
- Nancy Alvarado
- Instituto de Ciencias Químicas Aplicadas, Facultad de Ingeniería, Universidad Autónoma de Chile, El Llano Subercaseaux 2801, San Miguel 8900000, Chile
| | - Romina L. Abarca
- Departamento de Ciencias Animales, Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, Macul, Santiago 7820436, Chile;
| | - Cristian Linares-Flores
- Grupo de Investigación en Energía y Procesos Sustentables, Instituto de Ciencias Químicas Aplicadas, Facultad de Ingeniería, Universidad Autónoma de Chile, El Llano Subercaseaux 2801, San Miguel 8900000, Chile;
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8
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Effect of ZnO-based nanophotocatalyst on degradation of aniline. J Mol Model 2021; 27:92. [PMID: 33619651 DOI: 10.1007/s00894-021-04710-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Accepted: 02/10/2021] [Indexed: 10/22/2022]
Abstract
In this research, a zinc oxide/copper oxide/graphene oxide (ZnO/CuO/GO) nanophotocatalyst was synthesized for photodegradation of aniline as a pollutant, upon exposure to ultraviolet light (UV). Three variables including initial aniline concentration, the nanophotocatalyst dosage, and pH were designed. The statistical test and optimal conditions were determined. The consequences specified that the optimum values of pH, initial aniline concentration, the dosage of nanophotocatalyst, and the reaction time were 6, 150 ppm, 1 g/L, and 3 h, respectively. The obtained results revealed that the photodegradation of aniline was enhanced with doping zinc oxide and CuO on the graphene oxide. Under optimal conditions, 97% photodegradation of aniline was observed. The mechanism of aniline degradation with nanophotocatalyst was evaluated by molecular dynamic (MD) graphs. The interactions between nanophotocatalysts and aniline were considered by energy, density graph.
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9
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Xu S, Gu M, Wu K, Li G. Unraveling the interaction mechanism between collagen and alcohols with different chain lengths and hydroxyl positions. Colloids Surf B Biointerfaces 2021; 199:111559. [PMID: 33429285 DOI: 10.1016/j.colsurfb.2021.111559] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 12/20/2020] [Accepted: 01/03/2021] [Indexed: 01/19/2023]
Abstract
The present study systematically investigated the effects of alcohols, including methanol, ethanol, n-butanol, and propanol with different hydroxyl group numbers and locations on the thermal stability and molecular aggregation behavior of collagen. The results of ultra-sensitive differential scanning calorimetry (US-DSC), dynamic light scattering (DLS) and intrinsic fluorescence showed that with the increase of carbon chain length, alcohols can denature collagen, accompanied by transition in triple helical structure, promoted aggregation behavior, and altered molecular interactions. However, with the number of hydroxyl groups in alcohol molecules increased, the thermal stability of collagen increased and the molecules tended to disperse. Furthermore, radial distribution function (RDF) results showed that alcohols can change the structure of the hydration layer around collagen, thus altering the aggregation morphology of collagen molecules in solution. The results of the interaction between components in different alcohol systems demonstrated that with the decrease of alcohol polarity, bridge bond networks were formed between collagen molecules. Specifically, it was found that because the hydroxyl groups in 1,3-propanediol are located at both ends of the carbon chain, the reticular bridge bond structure formed between the collagen molecules changed into chain-like bridge structure. The bridge bonds between collagen molecules were considered to be weak cross-linking, which was an important reason for the destruction of collagen structure. In this study, the mechanism of interaction between different alcohols and collagen was elucidated, which will be helpful for further development of complex alcohol and collagen products.
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Affiliation(s)
- Songcheng Xu
- Key Laboratory of Leather Chemistry and Engineering (Ministry of Education), Sichuan University, Chengdu 610065, PR China
| | - Min Gu
- National Engineering Research Center of Clean Technology in Leather Industry, Sichuan University, Chengdu 610065, PR China
| | - Kun Wu
- School of Materials and Environmental Protection, Chengdu Textile College, Chengdu 610065, PR China.
| | - Guoying Li
- Key Laboratory of Leather Chemistry and Engineering (Ministry of Education), Sichuan University, Chengdu 610065, PR China; National Engineering Research Center of Clean Technology in Leather Industry, Sichuan University, Chengdu 610065, PR China.
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10
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Modabber G, Sepahi AA, Yazdian F, Rashedi H. Surfactin production in the bioreactor: Emphasis on magnetic nanoparticles application. Eng Life Sci 2020; 20:466-475. [PMID: 33204233 PMCID: PMC7645645 DOI: 10.1002/elsc.201900163] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 04/15/2020] [Accepted: 05/18/2020] [Indexed: 11/15/2022] Open
Abstract
Surfactin is one of the main lipopeptide biosurfactants produced by different species of Bacillus subtilis. This study aims to analyze the effect of starch-coated Fe0 and Fe3+ nanoparticles on the biomass and biosurfactant production of Bacillus subtilis. Out of 70 soil samples, 20 Bacillus were isolated and genome sequenced by biochemical methods and 16S rRNA gene. Quantitative and qualitative screening methods were used to isolate and detect biosurfactant production. For the aim of this study, 61 and 63 (Bacillus subtilis subsp. Inaquosorum) were selected. Then, hemolytic activity, biomass amount, surfactant production, and reduction of surface tension in Minimal Salt Medium containing Fe0 and Fe3+ nanoparticles were examined after 48, 72, and 96 h of culture. Strain 61 was the best bacterium and Fe3+ was the best nanoparticle. The results were compared with the results of non-nanoparticle bioreactor. The results showed the amount of biomass, surfactin, and surface tension decrease, 72 h after growth in 61 strain containing Fe3+ reached the highest values. Surfactin from strain 61 culture in the Fe3+nanoparticle bioreactor after 72 h of growth showed higher production than the same strain culture after 72 h without Fe3+, if continuing the research, this strain can be commercialized in the future.
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Affiliation(s)
- Glayol Modabber
- Department of Microbiology, Faculty of Biological SciencesIslamic Azad UniversityTehranIran
| | - Abbas Akhavan Sepahi
- Department of Microbiology, Faculty of Biological SciencesIslamic Azad UniversityTehranIran
| | - Fatemeh Yazdian
- Department of Life Science Engineering, Faculty of New Science and TechnologiesUniversity of TehranTehranIran
| | - Hamid Rashedi
- Department of Biotechnology, School of Chemical Engineering, College of EngineeringUniversity of TehranTehranIran
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11
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Enhancement of photosynthetic bacteria biomass production and wastewater treatment efficiency by zero-valent iron nanoparticles. J Biosci Bioeng 2020; 130:306-310. [PMID: 32386822 DOI: 10.1016/j.jbiosc.2020.04.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Revised: 04/07/2020] [Accepted: 04/13/2020] [Indexed: 01/05/2023]
Abstract
Photosynthetic bacteria (PSB) wastewater treatment is a novel technology for wastewater purification and resources recovery but is restricted by low efficiency. This paper applied zero-valent iron nanoparticles (Fe0 NPs) to enhance its performance. Results showed that 20 mg/L Fe0 NPs under light-anaerobic condition significantly increased the PSB biomass production and wastewater chemical oxygen demand removal by 122% and 164.3%, and shortened the time required for wastewater purification by 33%; these effects were far more better than the addition of Fe2+. The mechanism was because the addition of Fe0 NPs promoted the intracellular ATP content and pigments (carotenoid and bacteriochlorophyll) contents, and up-regulated dehydrogenase and succinate dehydrogenase activity; the increase rate reached 38.7%, 39.6%, 22.0%, 23.9% and 218.2%, respectively.
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12
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Graphene oxide-supported nanoscale zero-valent iron composites for the removal of atrazine from aqueous solution. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.124466] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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13
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Sabaghian S, Yazdian F, Rasekh B, Shekarriz M, Mansouri N. Investigating the effect of starch/Fe 3O 4 nanoparticles on biodesulfurization using molecular dynamic simulation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:1667-1676. [PMID: 31755060 DOI: 10.1007/s11356-019-06453-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 09/06/2019] [Indexed: 06/10/2023]
Abstract
The application of dibenzothiophene (DBT) as a source of energy leads to air pollution. The key solution to overcome this drawback is desulfurization. Magnetic nanoparticles have shown an excellent performance in the desulfurization of dibenzothiophene. In this study, molecular dynamic (MD) simulation was considered for the first time to gain insight about the molecule interactions in the biodesulfurization (BDS) process of DBT using Rhodococcus erythropolis IGTS8, in the presence and absence of starch/magnetic nanoparticles. According to the MD simulation results, the density of the system in the presence of starch/Fe3O4 was ascending while in the absence of these nanoparticles, the density was descending. Starch/magnetic nanoparticles caused more rapid equilibrium state in the biodesulfurization process. The energy diagram showed that magnetic nanoparticles decrease the energy fluctuation and increase the difference of non-bounding energy and potential energy (8 times) compared to (BDS) without nanoparticle, which reflects higher bounded energy in the system using starch/magnetic nanoparticles. The height of RDF peak in the presence of starch/Fe3O4 was 4 times more than the RDF peak in the absence of nanoparticle. In addition, the nanoparticles decreased the fluctuations around optimal temperature in BDS up to 5% compared to other state.
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Affiliation(s)
- Soltan Sabaghian
- Department of Environmental Science, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Fatemeh Yazdian
- Department of Life Science Engineering, Faculty of New Science and Technologies, University of Tehran, Tehran, Iran.
| | - Behnam Rasekh
- Research Institute of Petroleum Industry (RIPT), P.O. Box 1485733111, Tehran, Iran.
| | - Marziyeh Shekarriz
- Chemical, Polymeric and Petrochemical Technology Development Division, Faculty of Downstream Technology Development, Research Institute of Petroleum Industry, Tehran, Iran
| | - Nabiallah Mansouri
- Department of Environmental Engineering, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran
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14
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Effect of starch/CNT on biodesulfurization using molecular dynamic simulation. J Mol Model 2019; 25:352. [PMID: 31768651 DOI: 10.1007/s00894-019-4236-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 10/16/2019] [Indexed: 01/24/2023]
Abstract
Nowadays, fossil fuel is the most important source of energy. However, the sulfur oxide release through oxidation of the available sulfur and the resultant air pollution has turned into an issue. In biodesulfurization (BDS) process, the sulfur from the recalcitrant organic compounds dissolved in crude oil fractions will be removed biologically. Carbon nanotubes (CNTs) exhibit good catalytic performance in dibenzothiophene (DBT) oxidation. Molecular dynamic simulation is the best and the only way to reach this end. Through this study, molecular dynamic simulations are applied to compute the effects of starch/CNTs on BDS process of DBT during 5 ns. The changes of cell length, energy, dynamic temperature, relative concentration of DBT, and radial distribution function (RDF) in the absence and presence of starch/CNTs were investigated. Regarding to the energy diagram, the fluctuation because of temperature fluctuations reaches the stable state. The high level of the first peak in RDF diagram showed the high and long desulfurization by microorganism. All the results showed stable and reasonable equilibrium state of the system. According to the graphs, the simultaneous in the presence of starch/CNT and Rhodococcus erythropolis increase the removal efficiency of nitrate reached 85% and in the absence of nanoparticle was 35.44%.
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15
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Polyhydroxybutyrate Production from Natural Gas in A Bubble Column Bioreactor: Simulation Using COMSOL. Bioengineering (Basel) 2019; 6:bioengineering6030084. [PMID: 31527529 PMCID: PMC6783825 DOI: 10.3390/bioengineering6030084] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2019] [Revised: 09/09/2019] [Accepted: 09/09/2019] [Indexed: 12/17/2022] Open
Abstract
In this study, the simulation of microorganism ability for the production of poly-β-hydroxybutyrate (PHB) from natural gas (as a carbon source) was carried out. Based on the Taguchi algorithm, the optimum situations for PHB production from natural gas in the columnar bubble reactor with 30 cm length and 1.5 cm diameter at a temperature of 32 °C was evaluated. So, the volume ratio of air to methane of 50:50 was calculated. The simulation was carried out by COMSOL software with two-dimensional symmetric mode. Mass transfer, momentum, density-time, and density-place were investigated. The maximum production of biomass concentration reached was 1.63 g/L, which shows a 10% difference in contrast to the number of experimental results. Furthermore, the consequence of inlet gas rate on concentration and gas hold up was investigated Andres the simulation results were confirmed to experimental results with less than 20% error.
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16
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Mukhopadhyay R, Adhikari T, Sarkar B, Barman A, Paul R, Patra AK, Sharma PC, Kumar P. Fe-exchanged nano-bentonite outperforms Fe 3O 4 nanoparticles in removing nitrate and bicarbonate from wastewater. JOURNAL OF HAZARDOUS MATERIALS 2019; 376:141-152. [PMID: 31128393 DOI: 10.1016/j.jhazmat.2019.05.025] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 05/07/2019] [Accepted: 05/11/2019] [Indexed: 06/09/2023]
Abstract
Nitrate (NO3-) and bicarbonate (HCO3-) are harmful for the water quality and can potentially create negative impacts to aquatic organisms, crops and humans. This study deals with the removal of NO3- and HCO3- from contaminated wastewater using Fe-exchanged nano-bentonite and Fe3O4 nanoparticles. X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, surface area measurement and particle size analysis revealed that the adsorbents fall under the nano-scale size range with high specific surface area, and Fe was successfully exchanged in the nano-bentonite clay. The kinetics of adsorption was well defined by pseudo-first order and pseudo-second order kinetic models for both NO3- and HCO3-. The Fe-exchanged nano-bentonite was a better performing adsorbent of the oxyanions than Fe3O4 nanoparticles. According to the Sips isothermal model, the Fe-exchanged nano-bentonite exhibited the highest NO3- and HCO3- adsorption potential of 64.76 mg g-1 and 9.73 meq g-1, respectively, while the respective values for Fe3O4 nanoparticles were 49.90 mg g-1 and 3.07 meq g-1. Thus, inexpensiveness and easy preparation process of Fe-exchanged nano-bentonite make it attractive for NO3- and HCO3- removal from contaminated wastewater with significant environmental and economic benefits.
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Affiliation(s)
- Raj Mukhopadhyay
- ICAR-Central Soil Salinity Research Institute, Karnal 132001, India
| | - Tapan Adhikari
- ICAR-Indian Institute of Soil Science, Bhopal 462038, India
| | - Binoy Sarkar
- Department of Animal and Plant Sciences, The University of Sheffield, Sheffield, S10 2TN, UK.
| | - Arijit Barman
- ICAR-Central Soil Salinity Research Institute, Karnal 132001, India
| | - Ranjan Paul
- Division of Soil Resource Studies, ICAR-National Bureau of Soil Survey and Land Use Planning, Nagpur 440033, India
| | - Ashok K Patra
- ICAR-Indian Institute of Soil Science, Bhopal 462038, India
| | - Parbodh C Sharma
- ICAR-Central Soil Salinity Research Institute, Karnal 132001, India
| | - Parveen Kumar
- ICAR-Central Soil Salinity Research Institute, Karnal 132001, India
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Bavandi R, Emtyazjoo M, Saravi HN, Yazdian F, Sheikhpour M. Study of capability of nanostructured zero-valent iron and graphene oxide for bioremoval of trinitrophenol from wastewater in a bubble column bioreactor. ELECTRON J BIOTECHN 2019. [DOI: 10.1016/j.ejbt.2019.02.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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