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Wu D, Zhao B, Zhang P, An Q. Insight into the effect of nitrate on AGS granulation: Granular characteristics, microbial community and metabolomics response. WATER RESEARCH 2023; 236:119949. [PMID: 37054606 DOI: 10.1016/j.watres.2023.119949] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 04/04/2023] [Accepted: 04/06/2023] [Indexed: 06/19/2023]
Abstract
As a promising wastewater treatment technology, aerobic granular sludge (AGS) process is still hindered by slow granule formation and easy disintegration in the application. While nitrate, one of the target pollutants in wastewater, showed a potential effect on AGS granulation process. Herein, this study attempted to reveal the role of nitrate in AGS granulation. By adding exogenous nitrate (10 mg L-1), the AGS formation was markedly improved and accomplished at 63 d, while the control group achieved AGS formation at 87 d. However, a disintegration was observed under a long-term nitrate feeding. A positive correlation was observed among granule size, extracellular polymeric substances (EPS) and intracellular c-di-GMP level in both formation and disintegration phases. The subsequent static biofilm assays indicated that nitrate might upregulate c-di-GMP via denitrification-derived NO, and c-di-GMP further upregulated EPS, thereby promoting AGS formation. However, excessive NO probably caused disintegration by downregulating c-di-GMP and EPS. Microbial community showed that nitrate favored the enrichment of denitrifiers and EPS producing microbes, which were responsible for the regulation of NO, c-di-GMP and EPS. Metabolomics analysis showed that amino acid metabolism was the most affected metabolism by nitrate. Some amino acids, such as Arg, His and Asp, were upregulated in the granule formation phase and downregulated in the disintegration phase, indicating the potential contribution to EPS biosynthesis. This study provides metabolic insight into how nitrate promotes/inhibits granulation, which may contribute to unwrapping the mystery of granulation and overcoming the limitations of AGS application.
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Affiliation(s)
- Danqing Wu
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, 400045 Chongqing, China; College of Environment and Ecology, Chongqing University, 400045 Chongqing, China
| | - Bin Zhao
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, 400045 Chongqing, China; College of Environment and Ecology, Chongqing University, 400045 Chongqing, China.
| | - Peng Zhang
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, 400045 Chongqing, China; College of Environment and Ecology, Chongqing University, 400045 Chongqing, China
| | - Qiang An
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, 400045 Chongqing, China; College of Environment and Ecology, Chongqing University, 400045 Chongqing, China
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2
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ElGharbi H, Henni A, Salama A, Zoubeik M, Kallel M. Toward an Understanding of the Role of Fabrication Conditions During Polymeric Membranes Modification: A Review of the Effect of Titanium, Aluminum, and Silica Nanoparticles on Performance. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2022. [DOI: 10.1007/s13369-022-07143-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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3
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Arshad F, Aubry C, Zou L. Highly Permeable MoS 2 Nanosheet Porous Membrane for Organic Matter Removal. ACS OMEGA 2022; 7:2419-2428. [PMID: 35071929 PMCID: PMC8772329 DOI: 10.1021/acsomega.1c06480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Accepted: 12/29/2021] [Indexed: 05/14/2023]
Abstract
MoS2 nanosheets were synthesized by a bottom-up green chemical process where l-cysteine was used as a sulfur precursor. With specific concentrations, molar ratio of reactants, and pre-mixing conditions, MoS2 nanosheets of 200-300 nm in size and 4.2 nm in average thickness were successfully obtained. Porous membranes were then prepared by depositing the MoS2 nanosheet suspension on a 0.1 μm pore size poly(vinylidene difluoride) membrane filter in a multiple batch procedure. The membrane deposited with 12 batches of MoS2 nanosheets achieved 93.78% removal of bovine serum albumin. Acid red removal of 95.65% was also achieved after the second filtration pass. The porous MoS2 nanosheet membrane also demonstrated a high water flux of 182 ± 2.0 L/(m2 h). This result overcame the trade-off between selectivity and permeability faced by polymeric ultrafiltration membranes. The MoS2 nanosheets as building blocks formed not only intersheet slit pores with a narrow half-width to restrict the passage of organic molecules but also macro-channels allowing easy passage of water. The assembled MoS2 nanosheet membrane delivered promising separation of protein molecules and a high flux, attributing to its porous nanostructure, and could be a potential membrane for various water applications.
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Affiliation(s)
- Fathima Arshad
- Department
of Civil Infrastructure and Environment Engineering, Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates
| | - Cyril Aubry
- Department
of Research Laboratories Operations, Khalifa
University of Science and Technology, Abu Dhabi 127788, United
Arab Emirates
| | - Linda Zou
- Department
of Civil Infrastructure and Environment Engineering, Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates
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4
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Fabrication of gold nanostructure decorated polystyrene hybrid nanosystems via poly(L-DOPA) and their applications in surface-enhanced Raman Spectroscopy (SERS), and catalytic activity. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126654] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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5
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Mazlumoglu H, Yilmaz M. Silver nanoparticle-decorated titanium dioxide nanowire systems via bioinspired poly(L-DOPA) thin film as a surface-enhanced Raman spectroscopy (SERS) platform, and photocatalyst. Phys Chem Chem Phys 2021; 23:13396-13404. [PMID: 34105556 DOI: 10.1039/d1cp01322j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Silver nanostructure decorated-titanium dioxide (TiO2) nanocomposite systems with their unique characteristics provide extraordinary performance in various applications including surface-enhanced Raman spectroscopy (SERS), and photocatalysis. Despite the recent progress, novel, simple, effective, low-cost, reducing and stabilizing agent-free, and easy-to-tune approaches are heavily demanded for the preparation of these nanocomposites. In this context, we propose the fabrication of silver nanostructure decorated TiO2 nanowires (TiO2 NWs) through a thin interphase layer of the polymer of 3,4-dihydroxyphenyl-l-alanine (PLDOPA). In the first step, TiO2 NWs were synthesized through the hydrothermal method and then a conformal thin film of PLDOPA was deposited onto the TiO2 NWs (TiO2@PLDOPA) by oxidative polymerization of l-DOPA. Having various functional groups including catechol and amine, the PLDOPA thin-film reduced the silver ions onto the TiO2 NWs and stabilized the resultant nanocomposites without the employment of any surfactant, reducing agent, and seed material. By simply tuning the amount of silver ions, we could manipulate the size, morphology, and interparticle distance of silver nanostructures decorated onto the TiO2@PLDOPA colloidal composite system (TiO2@PLDOPA@Ag NP). The TiO2@PLDOPA@Ag nanocomposite systems provided unique properties as an ideal SERS platform and photocatalyst. The optimized TiO2@PLDOPA@Ag nanosystem demonstrated a high SERS activity, reproducibility, and self-cleaning property with an enhancement factor of 5.1 × 105. As a photocatalyst, the TiO2@PLDOPA@Ag NP systems provided remarkable performance under visible light irradiation in the catalytic degradation of methylene blue.
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Affiliation(s)
| | - Mehmet Yilmaz
- Department of Chemical Engineering, Ataturk University, 25240 Erzurum, Turkey. and East Anatolia High Technology Application and Research Center (DAYTAM), Ataturk University, 25240 Erzurum, Turkey and Department of Nanoscience and Nanoengineering, Ataturk University, 25240 Erzurum, Turkey
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6
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Turan H, Calis B, Dizaji AN, Tarhan S, Mazlumoglu H, Aysin F, Yilmaz A, Yilmaz M. Poly(L-DOPA)-mediated bimetallic core-shell nanostructures of gold and silver and their employment in SERS, catalytic activity, and cell viability. NANOTECHNOLOGY 2021; 32:315702. [PMID: 33878753 DOI: 10.1088/1361-6528/abf9c7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Accepted: 04/20/2021] [Indexed: 06/12/2023]
Abstract
Core-shell gold nanorod (AuNR)@silver (Ag) nanostructures with their unique properties have gained enormous interest and are widely utilized in various applications including sensor systems, catalytic reactions, diagnosis, and therapy. Despite the recent progress, simple, effective, low-cost, and easy-to-tune strategies are heavily required to fabricate these nanoparticles (NP) systems. For this, we propose the employment of the polymer of 3,4-dihydroxyphenyl-L-alanine (L-DOPA) as a ligand molecule. A conformal thin layer of polymer of L-DOPA (PLDOPA) with its various functional groups enabled the reduction of silver ions onto the AuNRs and stabilization of the resultant NPs without using any surfactant, reducing agent, and seed material. The shape and growth model of the AuNR@Ag nanostructures was manipulated by simply tuning the amount of silver ions. This procedure created different NP morphologies ranging from concentric to acentric/island shape core-shell nanostructures. Also, even at the highest Ag deposition, the PLDOPA layer is still conformally present onto the Au@Ag core-shell NRs. The unique properties of NP systems provided remarkable characteristics in surface-enhanced Raman spectroscopy, catalytic activity, and cell viability tests.
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Affiliation(s)
- Hasan Turan
- East Anatolia High Technology Application and Research Center (DAYTAM), Ataturk University, 25240 Erzurum, Turkey
- Department of Nanoscience and Nanoengineering, Ataturk University, 25240 Erzurum, Turkey
| | - Baris Calis
- East Anatolia High Technology Application and Research Center (DAYTAM), Ataturk University, 25240 Erzurum, Turkey
- Department of Molecular Biology and Genetics, Ataturk University, 25240 Erzurum, Turkey
| | - Araz Norouz Dizaji
- East Anatolia High Technology Application and Research Center (DAYTAM), Ataturk University, 25240 Erzurum, Turkey
- Department of Chemical Engineering, Ataturk University, 25240 Erzurum, Turkey
| | - Seda Tarhan
- East Anatolia High Technology Application and Research Center (DAYTAM), Ataturk University, 25240 Erzurum, Turkey
- Department of Chemical Engineering, Ataturk University, 25240 Erzurum, Turkey
| | | | - Ferhunde Aysin
- East Anatolia High Technology Application and Research Center (DAYTAM), Ataturk University, 25240 Erzurum, Turkey
- Department of Biology, Ataturk University, 25240 Erzurum, Turkey
| | - Asli Yilmaz
- East Anatolia High Technology Application and Research Center (DAYTAM), Ataturk University, 25240 Erzurum, Turkey
- Department of Molecular Biology and Genetics, Ataturk University, 25240 Erzurum, Turkey
| | - Mehmet Yilmaz
- East Anatolia High Technology Application and Research Center (DAYTAM), Ataturk University, 25240 Erzurum, Turkey
- Department of Nanoscience and Nanoengineering, Ataturk University, 25240 Erzurum, Turkey
- Department of Chemical Engineering, Ataturk University, 25240 Erzurum, Turkey
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Li N, Guo C, Shi H, Xu Z, Xu P, Teng K, Shan M, Qian X. Analysis of Mg 2+/Li + separation mechanism by charged nanofiltration membranes: visual simulation. NANOTECHNOLOGY 2021; 32:085703. [PMID: 33176292 DOI: 10.1088/1361-6528/abc98b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The mechanism of the nanofiltration (NF) membrane separation of Mg2+ and Li+ needs to be further investigated, but some commonly used model theories are abstract, which makes them difficult to understand. More importantly, the relationship between the membrane charge and separation performance of Mg2+ and Li+ cannot be quantitatively analyzed. It is worth studying these challenges and providing a performance boost for Mg2+/Li+ filtration applications of NF membranes. Here, various NF membranes, with the membrane volumetric charge density increasing from -4.69 to 7.02 mol · m-3, were fabricated via interfacial polymerization. For these membranes, the separation factor S Mg,Li was decreased from 0.41 to 0.20. Importantly, the visual simulation results were consistent with the experimental results as a whole. The separation factor S Mg,Li decreased with the increase of volumetric charge density, and the minimum separation factor S Mg,Li of the NF membranes was 0.20 (experiment) and 0.17 (simulation), respectively. This meant that the performance of the positively charged NF membrane was not fully developed. Furthermore, we analyzed the relationship between the membrane charge and separation performance, and visualized the simulation of the NF membrane filtration and separation.
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Affiliation(s)
- Nan Li
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textiles Science and Engineering, Tiangong University, Tianjin 300387, People's Republic of China
| | - Changsheng Guo
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textiles Science and Engineering, Tiangong University, Tianjin 300387, People's Republic of China
| | - Haiting Shi
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textiles Science and Engineering, Tiangong University, Tianjin 300387, People's Republic of China
| | - Zhiwei Xu
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textiles Science and Engineering, Tiangong University, Tianjin 300387, People's Republic of China
| | - Ping Xu
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textiles Science and Engineering, Tiangong University, Tianjin 300387, People's Republic of China
| | - Kunyue Teng
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textiles Science and Engineering, Tiangong University, Tianjin 300387, People's Republic of China
| | - Mingjing Shan
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textiles Science and Engineering, Tiangong University, Tianjin 300387, People's Republic of China
| | - Xiaoming Qian
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textiles Science and Engineering, Tiangong University, Tianjin 300387, People's Republic of China
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2D MoS 2 nanoplatelets for fouling resistant membrane surface. J Colloid Interface Sci 2021; 590:415-423. [PMID: 33561591 DOI: 10.1016/j.jcis.2021.01.085] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 01/21/2021] [Accepted: 01/27/2021] [Indexed: 11/20/2022]
Abstract
2D Molybdenum disulfide (MoS2) nanoplatelets were synthesized via a green bottom-up strategy using non-toxic l-Cysteine as sulfur source. Thehydrophobic MoS2 nanoplatelets assisted by hydrophilic 3-(3, 4-dihydroxyphenyl)-l-alanine (l-DOPA) were coated on a thin film composite nanofiltration (TFC-NFG) membrane. The accelerated fouling experiments were conducted by usingbovine serum albumin (BSA) asmodel organic foulant,and MoS2 coated membrane demonstrated excellent resistance with almost no flux decline within first hour of filtration, whereas the uncoated membrane showed flux decline immediately from the beginning of the experiment. After 5-hour filtration, the flux reduced by only 26% for MoS2 coated membrane with a higher flux recovery rate of 85.4% after washing by de-ionized (DI) water, whereas 45% flux decline was observed for uncoated membrane with lower flux recovery of 68%.These antifouling effects attributed by MoS2coated membrane were underpinned by combined unique interfacial properties offered by 2D tri-atomic layered MoS2morphology including dispersive surface tension, reduced surface roughness, weaker MoS2-foulant interactive forces, and negatively charged surface. This research positively confirms the role of 2D MoS2 nanoplatelets as an anti-fouling coating on membranes and brings up more possibility for applying other nanomaterials in 2D family in water applications such as desalination and water treatment.
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Tsou CH, Zhao L, Gao C, Duan H, Lin X, Wen Y, Du J, Lin SM, Suen MC, Yu Y, Liu X, De Guzman MR. Characterization of network bonding created by intercalated functionalized graphene and polyvinyl alcohol in nanocomposite films for reinforced mechanical properties and barrier performance. NANOTECHNOLOGY 2020; 31:385703. [PMID: 32464605 DOI: 10.1088/1361-6528/ab9786] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Graphene that consists of less than 10 layers is expensive; moreover, it tends to agglomerate. These disadvantages restrict its utility. In this regard, the present study aimed to reduce the number of layers of a functionalized graphene (FG) with 10-30 layers to less than 10 layers by using an ultrasonic processor. We prepared nanocomposite films of polyvinyl alcohol (PVA) incorporated with FG by a simple hydrothermal method and ultrasonic dispersion. Oxygen transmission rate and water vapor permeability were considerably increased on account of modifying PVA with FG. Furthermore, the mechanical properties, thermostability, and barrier properties were improved. The barrier efficiency of the nanocomposites at different temperatures remained high for long periods of operation because of the network bonding. A simple procedure involving relatively low-cost nanomaterials could unlock the potential of nanocomposite FG/PVA films in the fields of coating, packaging, and semiconductor materials.
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Affiliation(s)
- Chi-Hui Tsou
- Material Corrosion and Protection Key Laboratory of Sichuan Province, School of Materials Science and Engineering, Sichuan University of Science and Engineering, Zigong 643000, People's Republic of China. Sichuan Yibin Plastic Packaging Materials Co., Ltd, Yibin 644007, People's Republic of China. Sichuan Golden-Elephant Sincerity Chemical Co., Ltd, Meishan 620010, People's Republic of China. Sichuan Zhixiangyi Technology Co., Ltd, Chengdu 610051, People's Republic of China. Sichuan Zhirenfa Environmental Protection Technology Co., Ltd, Zigong 643000, People's Republic of China. Department of Materials Science, Chulalongkorn University, Bangkok 10330, Thailand
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