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Wei Y, Chen T, Qiu Z, Liu H, Xia Y, Wang Z, Zou R, Liu C. Enhanced lead and copper removal in wastewater by adsorption onto magnesium oxide homogeneously embedded hierarchical porous biochar. BIORESOURCE TECHNOLOGY 2022; 365:128146. [PMID: 36261111 DOI: 10.1016/j.biortech.2022.128146] [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: 08/16/2022] [Revised: 10/07/2022] [Accepted: 10/12/2022] [Indexed: 06/16/2023]
Abstract
Removing non-biodegradable Pb2+ and Cu2+ is the top priority in wastewater purification, while adsorption is a green technology to remove them. Herein, MgO-embedded granular hierarchical porous biochar (HP-MgO@BC) was fabricated by pyrolysis of porous Mg-infused chitosan beads. MgO nanoparticles were homogeneously embedded throughout the hierarchical porous biochar matrix in a high-density and accessible manner, thus providing a large number of easily accessible adsorption sites. Pb2+ and Cu2+ sorption capacities on HP-MgO@BC are 1044.8 and 811.2 mg/g at pH 5, respectively. It could effectively remove Pb2+ and Cu2+ across a broad pH range of 2-7, and show excellent adsorption efficiency in the presence of interfering cations. It also possessed excellent reusability. In the fixed-bed operation, 7880 BV (78.80 L) and 1610 BV (16.10 L) of synthetic Pb2+ and Cu2+ wastewater could be purified by HP-MgO@BC packed column, respectively. The adsorption mechanism involves mineral precipitation, ion exchange, and surface coordination.
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Affiliation(s)
- Yuanfeng Wei
- Ministry of Forestry Bioethanol Research Center, School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China
| | - Tao Chen
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, PR China
| | - Zhiyuan Qiu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, PR China
| | - Huiling Liu
- School of Science, Hunan University of Technology and Business, Changsha 410205, PR China
| | - Yufen Xia
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, PR China
| | - Zhimin Wang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, PR China
| | - Ruiying Zou
- Ministry of Forestry Bioethanol Research Center, School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China
| | - Chengbin Liu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, PR China.
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2
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Etxabide A, Akbarinejad A, Chan EW, Guerrero P, de la Caba K, Travas-Sejdic J, Kilmartin PA. Effect of gelatin concentration, ribose and glycerol additions on the electrospinning process and physicochemical properties of gelatin nanofibers. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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3
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Guo L, Chen A, Li C, Wang Y, Yang D, He N, Liu M. Solution chemistry mechanisms of exogenous silicon influencing the speciation and bioavailability of cadmium in alkaline paddy soil. JOURNAL OF HAZARDOUS MATERIALS 2022; 438:129526. [PMID: 35999739 DOI: 10.1016/j.jhazmat.2022.129526] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 06/26/2022] [Accepted: 07/01/2022] [Indexed: 06/15/2023]
Abstract
The mechanism of silicon (Si) influencing cadmium (Cd) speciation and bioavailability in alkaline paddy soil solution remains unclear. Therefore, this study sought to elucidate the effect of Si on Cd by combining chemical analysis and rice pot experiments. In this work, the effects of Na2SiO3 alkalinity and the differences in Na+ were eliminated in all treatments, and the Cd speciation in soil solutions was determined in-situ using a Field-Donnan membrane technology (DMT) cell. Additionally, rice yields and the Cd content in various parts of the rice plant were studied. The results showed that Si application significantly increased rice biomass by 32% (P < 0.05) while significantly reduced the Cd content in brown rice by 52% (P < 0.01) and the free Cd2+ concentration in the soil solution. Further analysis of the interaction of Si and Cd using Fourier transform-infrared spectroscopy (FT-IR), Raman, and X-ray photoelectron spectroscopy (XPS) indicated that a Si-Cd complex was formed by Cd and Si-O groups. In summary, Si changed the chemical speciation of Cd in the alkaline soil solution and formed a water-soluble Si-Cd complex that the rice could not absorb, consequently reducing Cd bioavailability.
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Affiliation(s)
- Lei Guo
- College of Land and Environment, Shenyang Agricultural University, Shenyang, Liaoning 110866, PR China
| | - Aiting Chen
- College of Land and Environment, Shenyang Agricultural University, Shenyang, Liaoning 110866, PR China
| | - Cai Li
- College of Land and Environment, Shenyang Agricultural University, Shenyang, Liaoning 110866, PR China
| | - Yaojing Wang
- College of Science, Shenyang Agricultural University, Shenyang, Liaoning 110866, PR China
| | - Dan Yang
- College of Land and Environment, Shenyang Agricultural University, Shenyang, Liaoning 110866, PR China
| | - Na He
- College of Land and Environment, Shenyang Agricultural University, Shenyang, Liaoning 110866, PR China
| | - Mingda Liu
- College of Land and Environment, Shenyang Agricultural University, Shenyang, Liaoning 110866, PR China.
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Ternary metal oxide nanocomposite for room temperature H2S and SO2 gas removal in wet conditions. Sci Rep 2022; 12:15387. [PMID: 36100623 PMCID: PMC9470665 DOI: 10.1038/s41598-022-19800-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Accepted: 09/05/2022] [Indexed: 11/17/2022] Open
Abstract
A ternary Mn–Zn–Fe oxide nanocomposite was fabricated by a one-step coprecipitation method for the remotion of H2S and SO2 gases at room temperature. The nanocomposite has ZnO, MnO2, and ferrites with a surface area of 21.03 m2 g−1. The adsorbent was effective in mineralizing acidic sulfurous gases better in wet conditions. The material exhibited a maximum H2S and SO2 removal capacity of 1.31 and 0.49 mmol g−1, respectively, in the optimized experimental conditions. The spectroscopic analyses confirmed the formation of sulfide, sulfur, and sulfite as the mineralized products of H2S. Additionally, the nanocomposite could convert SO2 to sulfate as the sole oxidation by-product. The oxidation of these toxic gases was driven by the dissolution and dissociation of gas molecules in surface adsorbed water, followed by the redox behaviour of transition metal ions in the presence of molecular oxygen and water. Thus, the study presented a potential nanocomposite adsorbent for deep desulfurization applications.
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Ma S, Pang S, Li J, Zhang Y. A review of efflorescence kinetics studies on atmospherically relevant particles. CHEMOSPHERE 2021; 277:130320. [PMID: 33773310 DOI: 10.1016/j.chemosphere.2021.130320] [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: 01/14/2021] [Revised: 03/11/2021] [Accepted: 03/16/2021] [Indexed: 06/12/2023]
Abstract
The efflorescence transitions of aerosol particles have been intensively investigated due to their critical impacts on global climate and atmospheric chemistry. In the present study, we present a critical review of efflorescence kinetics focusing on three key issues: the efflorescence relative humidity (ERH) and the influence factors for aerosol ERH (e.g. particle sizes, and temperature); efflorescence processes of mixed aerosols, concerning the effect of coexisting inorganic and organic components on the efflorescence of inorganic salts; homogeneous and heterogeneous nucleation rates of pure and mixed aerosols. Among the previous studies, there are significant discrepancies for measured aerosol ERH under even the same conditions. Moreover, the interactions between organic and inorganic components remain largely unclear, causing efflorescence transition behaviours and chemical composition evolutions of certain mixed systems to be debatable. Thus, it is important to better understand efflorescence to gain insights into the physicochemical properties and characterize observed efflorescence characteristics of atmospheric particles, as well as guide further studies on aerosol hygroscopicity and reactivity.
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Affiliation(s)
- Shuaishuai Ma
- The Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, People's Republic of China
| | - Shufeng Pang
- The Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, People's Republic of China
| | - Jing Li
- The Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, People's Republic of China.
| | - Yunhong Zhang
- The Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, People's Republic of China.
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6
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Stevenson M, Long J, Seyfoddin A, Guerrero P, Caba KDL, Etxabide A. Characterization of ribose-induced crosslinking extension in gelatin films. Food Hydrocoll 2020. [DOI: 10.1016/j.foodhyd.2019.105324] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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7
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Zhou Y, Zhang X, Liu Y, Xie X, Rui X, Zhang X, Feng Y, Zhang X, Yu Y, Huang K. A High-Temperature Na-Ion Battery: Boosting the Rate Capability and Cycle Life by Structure Engineering. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e1906669. [PMID: 31994345 DOI: 10.1002/smll.201906669] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2019] [Revised: 01/04/2020] [Indexed: 06/10/2023]
Abstract
High-temperature sodium ion batteries (SIBs) have drawn significant heed recently for large-scale energy storage. Yet, conventional SIBs are in the depths of inferior charge/discharge efficiency and cyclability at elevated temperatures. Rational structure design is highly desirable. Hence, a 3D hierarchical flower architecture self-assembled by carbon-coated Na3 V2 (PO4 )3 (NVP) nanosheets (NVP@C-NS-FL) is fabricated via a microwave-assisted glycerol-mediated hydrothermal reaction combined with a post heat-treatment. The growth mechanism of NVP@C-NS-FL is systematically investigated, by forming a microspherical glycerol/polyglycerol-NVP complex initially and then converting into flower-like architecture during the subsequent annealing at a low temperature ramping rate. Benefiting from the integrated structure, fast Na+ transportation, and highly effective heat transfer, the as-obtained NVP@C-NS-FL exhibits an excellent high-temperature SIB performance, e.g., 65 mAh g-1 (100 C) after 1000 cycles under 60 °C. When coupled with NaTi2 (PO4 )3 anode, the full cell can still display superior power capability of 1.4 kW kg-1 and long-term cyclability (2000 cycles) under 60 °C.
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Affiliation(s)
- Yanping Zhou
- Key Laboratory of Wireless Power Transmission of Ministry of Education, College of Electronics and Information Engineering, Sichuan University, Chengdu, 610065, China
| | - Xianghua Zhang
- Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices, Collaborative Innovation Center of Advanced Energy Materials, School of Materials and Energy, Guangdong University of Technology, Guangzhou, Guangdong, 510006, China
| | - Yanjing Liu
- Key Laboratory of Wireless Power Transmission of Ministry of Education, College of Electronics and Information Engineering, Sichuan University, Chengdu, 610065, China
| | - Xinxin Xie
- Key Laboratory of Wireless Power Transmission of Ministry of Education, College of Electronics and Information Engineering, Sichuan University, Chengdu, 610065, China
| | - Xianhong Rui
- Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices, Collaborative Innovation Center of Advanced Energy Materials, School of Materials and Energy, Guangdong University of Technology, Guangzhou, Guangdong, 510006, China
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Materials Science and Engineering, CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Xiong Zhang
- School of Chemical Engineering, Sichuan University, Chengdu, 610065, China
| | - Yuezhan Feng
- Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education, Zhengzhou University, Zhengzhou, 450002, China
| | - Xiaojun Zhang
- College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui, 241000, China
| | - Yan Yu
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Materials Science and Engineering, CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei, Anhui, 230026, China
- Dalian National Laboratory for Clean Energy (DNL), Chinese Academy of Sciences (CAS), Dalian, Liaoning, 116023, China
- State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Kama Huang
- Key Laboratory of Wireless Power Transmission of Ministry of Education, College of Electronics and Information Engineering, Sichuan University, Chengdu, 610065, China
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8
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Wu FM, Wang XW, Pang SF, Zhang YH. Measuring hygroscopicity of internally mixed NaNO 3 and glutaric acid particles by vacuum FTIR. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 219:104-109. [PMID: 31030037 DOI: 10.1016/j.saa.2019.04.034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 03/31/2019] [Accepted: 04/17/2019] [Indexed: 06/09/2023]
Abstract
Sodium nitrate as an important inorganic component can be chemically formed from the reactions of nitrogen oxides and nitric acid (HNO3) with sea salt in atmosphere. Organic acids contribute a significant fraction of photochemical formed secondary organics that can condense on the preexisting nitrate-containing particles. Atmospheric particles often include a complex mixture of nitrate and secondary organic materials accumulated within the same individual particles. Here we studied the hygroscopicity of aerosol particles composed of sodium nitrate and glutaric acid (GA) by using a pulsed RH controlling system and a rapid scan vacuum FTIR spectrometer (PRHCS-RSVFTIR). The water content in the particles and efflorescence ratios of both NaNO3 and GA at ambient relative humidity (RH) as a function of time were obtained from the rapid-scan infrared spectra with a sub-second time resolution. Our study showed that both NaNO3 and GA crystallized at 44.1% RH during two different RH control processes (stepwise and pulsed processes). It was found that the addition of GA could suppress the efflorescence of NaNO3 during the dehumidifying process. In addition, the mixed NaNO3/GA particles release HNO3 during the dehumidifying and humidifying cycles. These findings are important in further understanding the role of interactions between water-soluble dicarboxylic acids and nitrates on hygroscopicity and environmental effects of atmospheric particles.
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Affiliation(s)
- Feng-Min Wu
- School of Chemical Engineering and Pharmaceutics, Henan University of Science and Technology, Luoyang 471023, China; School of Chemistry and Chemical Physics Engineering, Beijing Institute of Technology, Beijing 100081, China.
| | - Xiao-Wei Wang
- School of Chemical Engineering and Pharmaceutics, Henan University of Science and Technology, Luoyang 471023, China; School of Chemistry and Chemical Physics Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Shu-Feng Pang
- School of Chemistry and Chemical Physics Engineering, Beijing Institute of Technology, Beijing 100081, China.
| | - Yun-Hong Zhang
- School of Chemistry and Chemical Physics Engineering, Beijing Institute of Technology, Beijing 100081, China.
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9
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Etxabide A, Long J, Guerrero P, de la Caba K, Seyfoddin A. 3D printed lactose-crosslinked gelatin scaffolds as a drug delivery system for dexamethasone. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.02.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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10
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Yang H, Wang N, Pang SF, Zheng CM, Zhang YH. Chemical reaction between sodium pyruvate and ammonium sulfate in aerosol particles and resultant sodium sulfate efflorescence. CHEMOSPHERE 2019; 215:554-562. [PMID: 30342400 DOI: 10.1016/j.chemosphere.2018.10.062] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2018] [Revised: 09/29/2018] [Accepted: 10/10/2018] [Indexed: 06/08/2023]
Abstract
The hygroscopicity of aerosols is dependent upon their chemical composition. When their chemical compositions are altered, the water content in aerosols often changes, which may further modify phase behaviour. However, the study of phase behaviour dependence on chemical reactions is still limited. In this work, internally mixed sodium pyruvate (SP)/ammonium sulfate (AS) droplets were studied using an in-situ ATR-FTIR spectrometer. FTIR spectral analysis showed that solid sodium sulfate (SS) formed during the dehydration process, indicating a chemical reaction between SP and AS. In addition, the water content decreased after a dehydration-hydration process despite organic salt (SS) to inorganic salt (AS) mole ratios (OIRs) During the second relative humidity (RH) cycle, the water content remained constant, however, the efflorescence relative humidity (ERH) was lower than that in the first dehydration. The crystal relative humidities (CRHs) of SS are 66.7-53.1%, 66.0-58.2%, 62.2-57.1% and 49.6-43.6% for OIRs of 3:1, 2:1, 1:1 and 1:3, respectively, suggesting the crystallization of SS was favoured by higher SP content. For 2:1 OIRs, the solid SS was the greatest and an excess of either SP or AS blocked the solid SS formation. At a constant 80% RH, depletion of reagents was ∼0.97, and water loss was ∼0.6 in ∼40 min. After 90 min, solid SS formed. The chemical reaction was faster than water loss; furthermore, water loss from the chemical reaction led to solid SS above the ERH of pure SS particles (∼75% RH). When the RH changed rapidly, the reaction was slow and solid SS decreased.
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Affiliation(s)
- Hui Yang
- School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China
| | - Na Wang
- School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China
| | - Shu-Feng Pang
- School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China.
| | - Chuan-Ming Zheng
- School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China
| | - Yun-Hong Zhang
- School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China.
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Shao X, Wu FM, Yang H, Pang SF, Zhang YH. Observing HNO 3 release dependent upon metal complexes in malonic acid/nitrate droplets. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 201:399-404. [PMID: 29775933 DOI: 10.1016/j.saa.2018.05.026] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 04/28/2018] [Accepted: 05/07/2018] [Indexed: 06/08/2023]
Abstract
Although the dicarboxylic acid has been reported to react with nitrate for aged internally mixed aerosols in atmosphere, the quantitative nitrate depletion dependent upon composition in particles is still not well constrained. The chemical composition evolutions for malonic acid/sodium nitrate (MA/SN), malonic acid/magnesium nitrate (MA/MN) and malonic acid/calcium nitrate (MA/CN) particles with the organic to inorganic molar ratio (OIR) of 1:1 are investigated by vacuum Fourier transform infrared spectroscopy (FTIR). Upon dehydration, the intensity of the asymmetric stretching mode of COO- group (νas-COO-) increases, accompanying the decrease in OH feather band and COOH band and NO3- band. These band changes suggest malonate salts formation and HNO3 release. The quantitative NO3- depletion data shows that the reactivity of MA-MN is most and that of MA-SN is least. Analysis of the stretching mode of COO- indicates the different bond type between metal cation and carboxylate anion. In addition, water content in particles decreases at the constant RH, implying water loss with the chemical reaction. When the RH changes very quickly, water uptake delay during the humidification process reveals that water mass transport is limited below 37% RH.
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Affiliation(s)
- Xu Shao
- The Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology. Beijing 100081, People's Republic of China; Beijing General Research Institute for Nonferrous Metals, People's Republic of China
| | - Feng-Min Wu
- The Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology. Beijing 100081, People's Republic of China
| | - Hui Yang
- The Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology. Beijing 100081, People's Republic of China
| | - Shu-Feng Pang
- The Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology. Beijing 100081, People's Republic of China.
| | - Yun-Hong Zhang
- The Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology. Beijing 100081, People's Republic of China
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Gao X, Cai C, Ma J, Zhang Y. Repartitioning of glycerol between levitated and surrounding deposited glycerol/NaNO 3/H 2O droplets. ROYAL SOCIETY OPEN SCIENCE 2018; 5:170819. [PMID: 29410802 PMCID: PMC5792879 DOI: 10.1098/rsos.170819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/02/2017] [Accepted: 11/24/2017] [Indexed: 06/07/2023]
Abstract
Repartitioning of semi-volatile organic compounds (SVOCs) between particles is an important process to understand the particle growth and shrinkage in the atmosphere environment. Here, by using optical tweezers coupled with cavity-enhanced Raman spectroscopy, we report the repartitioning of glycerol between a levitated glycerol/NaNO3/H2O droplet and surrounding glycerol/NaNO3/H2O droplets deposited on the inner wall of a chamber with different organic to inorganic molar ratios (OIRs). For the high OIR with 3 : 1, no NaNO3 crystallization occurs both for levitated and deposited droplets in the whole relative humidity (RH) range, the radius of the levitated droplet decreases slowly due to the evaporation of glycerol from the levitated droplet at constant RHs. The levitated droplets radii with OIR of 1 : 1 and 1 : 3 increase with constant RHs that are lower than 45.3% and 55.7%, respectively, indicating that the repartitioning of glycerol occurs. The reason is that NaNO3 in the deposited droplets is crystallized when RH is lower than 45.3% for 1 : 1 or 55.7% for 1 : 3. So the vapour pressure of glycerol at the surface of deposited droplets is higher than that of the levitated droplet which always remains as liquid droplet without NaNO3 crystallization, resulting in the transfer of glycerol from the deposited ones to the levitated one. The process of the glycerol repartitioning we discussed herein is a useful model to interpret the repartitioning of SVOCs between the externally mixed particles with different phase states.
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Affiliation(s)
| | | | - Jiabi Ma
- Authors for correspondence: Jiabi Ma e-mail:
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13
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Ji ZR, Zhang Y, Pang SF, Zhang YH. Crystal Nucleation and Crystal Growth and Mass Transfer in Internally Mixed Sucrose/NaNO3 Particles. J Phys Chem A 2017; 121:7968-7975. [DOI: 10.1021/acs.jpca.7b08004] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Zhi-Ru Ji
- The Institute of Chemical
Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, People’s Republic of China
| | - Yun Zhang
- The Institute of Chemical
Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, People’s Republic of China
| | - Shu-Feng Pang
- The Institute of Chemical
Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, People’s Republic of China
| | - Yun-Hong Zhang
- The Institute of Chemical
Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, People’s Republic of China
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14
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Tan F, Jing B, Tong S, Ge M. The effects of coexisting Na 2SO 4 on heterogeneous uptake of NO 2 on CaCO 3 particles at various RHs. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 586:930-938. [PMID: 28215800 DOI: 10.1016/j.scitotenv.2017.02.072] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Revised: 02/06/2017] [Accepted: 02/08/2017] [Indexed: 06/06/2023]
Abstract
Atmospheric particles can undergo nucleation, coagulation, chemical-aging, dissolution-precipitation or other atmospheric processes, resulting in complex multicomponent aerosols. The coexisting species have potentially important consequences in the heterogeneous reactions of multicomponent aerosol particles with polluted gases, which are still poorly understood. The effect of coexisting Na2SO4 on heterogeneous uptake of NO2 on CaCO3 particles is investigated in a broad RH range. The combination of DRIFTS, Raman, SEM and IC provides qualitative and quantitative information about the formation of nitrate and other surface species. Ca(NO3)2 and NaNO3 are generated on mixed CaCO3-Na2SO4 particles under dry condition. Both the amount of NO3- formed and the NO3- formation rates for the mixtures can be predicted based on the linear addition of those for pure CaCO3 and Na2SO4 particles under dry condition. The further reaction of Ca(NO3)2 with Na2SO4 could lead to the formation of crystal NaNO3 and CaSO4·0.5H2O at 30% RH. Coagulation between Ca2+ and SO42- in surface adsorbed water is observed after part conversion of CaCO3 to Ca(NO3)2, resulting in the formation of CaSO4·2H2O at 80% RH. The amount of NO3- formed on the mixtures is dramatically enhanced relative to the predictions at 30% and 80% RH. The findings presented here highlight the role of coexisting species in the heterogeneous reactions of trace gases with multicomponent aerosols due to the complexity of atmospheric particles.
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Affiliation(s)
- Fang Tan
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Bo Jing
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Shengrui Tong
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China.
| | - Maofa Ge
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China; Center for Excellence in Urban Atmospheric Environment (CEUAE), Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, PR China.
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15
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Effect of cross-linking in surface properties and antioxidant activity of gelatin films incorporated with a curcumin derivative. Food Hydrocoll 2017. [DOI: 10.1016/j.foodhyd.2016.11.036] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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