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Zhou M, Feng Y, Li H, Tian X. Sustainable structural polysaccharides conversion: How does DES pretreatment affect cellulase adsorption, thereby improving enzymatic digestion of lignocellulose? Carbohydr Polym 2024; 326:121593. [PMID: 38142091 DOI: 10.1016/j.carbpol.2023.121593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 11/01/2023] [Accepted: 11/13/2023] [Indexed: 12/25/2023]
Abstract
Biomass conversion aims at degrading the structural polysaccharides of lignocellulose into reducing sugars. Pretreatment is necessary to overcome the recalcitrance of lignocellulose. The DES La/ChCl in this paper was selected based on our previous study. To examine cellulase adsorption of lignocellulose after DES pretreatment, sorghum straw was pretreated with DES under different condition. The adsorption improvement of cellulase on lignocellulose after DES pretreatment has positive impact on reducing sugar production of biomass. After DES pretreatment, 1. pore corrosion caused the upward trend of pore radius and the downward trend of SSA. 2. the hydrogen bounding force of pretreated sorghum straw and MCC decreased, the hydrogen bounding force of pretreated lignin increased. 3. although the unsaturation of pretreated lignin increased, DES pretreatment is helpful for the removal of lignin. 4. The decrease in the hydrophobicity of sorghum straw make it easier to disperse. 5. the Zeta potential of pretreated sorghum straw shifted towards the positively charged region, while pretreated lignin shifted towards the negatively charged region. 6. different adsorption behaviors were observed in specific components of cellulase mixtures (BGs, CBHs, EGs and xlylanase). These results revealing the mechanism of enzyme adsorption are conductive for understanding the role of pretreatment in biomass conversion.
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Affiliation(s)
- Min Zhou
- State Key Laboratory of Pharmaceutical, School of Life Sciences, Nanjing University, Nanjing 210023, People's Republic of China
| | - Yuxuan Feng
- State Key Laboratory of Pharmaceutical, School of Life Sciences, Nanjing University, Nanjing 210023, People's Republic of China
| | - Haidong Li
- State Key Laboratory of Pharmaceutical, School of Life Sciences, Nanjing University, Nanjing 210023, People's Republic of China
| | - Xingjun Tian
- State Key Laboratory of Pharmaceutical, School of Life Sciences, Nanjing University, Nanjing 210023, People's Republic of China; Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, People's Republic of China.
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Xu L, Zhang F. FTIR study on the CO interactions of benzeneacetamide in solution. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 295:122601. [PMID: 36934598 DOI: 10.1016/j.saa.2023.122601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 02/26/2023] [Accepted: 03/06/2023] [Indexed: 06/18/2023]
Abstract
The main attention of present work is to study how benzeneacetamide interacts with other molecules in organic solvents. The frequencies of CO groups in 18 solvents were obtained by using infrared spectroscopy. The empirical parameters of the solvents as the acceptor number (AN), the van der Waals interaction parameters (SVW) and the linear solvation energy relationships (LSER) were correlated with the frequencies of carbonyl stretching vibration (ν(CO)) of benzeneacetamide to estimate the contributions in intermolecular interactions. The results showed that solvent effects on the frequencies of CO stretching vibrations of benzeneacetamide were obvious. Self-association of alkanol leads to enhancement of O-H⋯O=C hydrogen bond strength and red-shift of the ν(CO) peak. The ν(CO) of benzeneacetamide is more vulnerable to the acidity of the hydrogen bond donor of the solvent. This research contributes to a thorough understanding of the molecular interactions and microstructures in the liquid mixtures.
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Affiliation(s)
- Liang Xu
- Zhejiang Academy of Forestry, Hangzhou 310023, Zhejiang, China
| | - Feiying Zhang
- Zhejiang Academy of Forestry, Hangzhou 310023, Zhejiang, China.
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Wang Z, Chen H, Qin Y, Lan T. Effect of Fenton oxidized lignin support on immobilized β-glucosidase activity. J Biotechnol 2023; 368:31-41. [PMID: 37028559 DOI: 10.1016/j.jbiotec.2023.04.002] [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: 12/14/2022] [Revised: 03/10/2023] [Accepted: 04/04/2023] [Indexed: 04/09/2023]
Abstract
In this study, the Fenton oxidized lignin was prepared to investigate the effect of Fenton oxidation modification on the activity of lignin immobilized β-glucosidase (β-GL). The results demonstrated that Fenton oxidation could significantly improve the activity and stability of immobilized β-GL. This is because the Fenton oxidation increased the electrostatic, hydrogen bonding, and hydrophobic forces between lignin and β-GL, resulting in increased lignin adsorption onto β-GL. The Fenton oxidation also changed the chemical structure of lignin, altering the lignin-β-GL binding site and reducing the negative effect of lignin on the β-GL catalytic domain. This research will improve understanding of the effect of Fenton lignin oxidation on immobilized β-GL activity and expand the use of lignin in enzyme immobilization.
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Affiliation(s)
- Zekang Wang
- Faculty of Food Science and Engineering, Kunming University of Science and Technology, 727 South Jingming Rd., Chenggong District, Kunming, 650500, China
| | - Haiyan Chen
- Faculty of Food Science and Engineering, Kunming University of Science and Technology, 727 South Jingming Rd., Chenggong District, Kunming, 650500, China
| | - Yuyue Qin
- Faculty of Food Science and Engineering, Kunming University of Science and Technology, 727 South Jingming Rd., Chenggong District, Kunming, 650500, China
| | - Tianqing Lan
- Faculty of Food Science and Engineering, Kunming University of Science and Technology, 727 South Jingming Rd., Chenggong District, Kunming, 650500, China; National Engineering Research Center of Rice and Byproduct Deep Processing, College of Food Science and Engineering, Central South University of Forestry and Technology, 498 South Shaoshan Rd., Tianxin District, Changsha, 410004, China.
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Li N, Liu Y, Du C, Wang Y, Wang L, Li X. A novel role of various hydrogen bonds in adsorption, desorption and co-adsorption of PPCPs on corn straw-derived biochars. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 861:160623. [PMID: 36460113 DOI: 10.1016/j.scitotenv.2022.160623] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 11/24/2022] [Accepted: 11/27/2022] [Indexed: 06/17/2023]
Abstract
The effect of various hydrogen bonds with different strength on the environmental behaviors of PPCPs remains unclear. In this study, three pharmaceutical pollutants including clofibric acid (CA), sulfamerazine (SMZ), and acetaminophen (ACT) with different functional groups and pKa, were selected as representative of PPCPs to investigate the pivotal role of hydrogen bonds in adsorption/desorption and co-adsorption behaviors of PPCPs on two corn straw-derived biochars prepared at 300 °C (BCs-300) and 600 °C (BCs-600), respectively. The results indicated that charge-assisted hydrogen bond (CAHB) and ordinary hydrogen bond (OHB) with different intensities were the pivotal mechanisms responsible for the adsorption of three PPCPs on biochars, which was further confirmed by FTIR, but their immobilization effects of PPCPs on biochars were completely different. Compared with OHB formed between CA and BCs-600, the stronger CAHB (formed between CA and BCs-300, and SMZ/ACT and BCs-300/BCs-600) with covalent bond characteristics that derived from the smaller |ΔpKa| (<5.0), resulted in the greater adsorption capacity (Qs) and affinity (Kf) of the three PPCPs on BCs-300 (Qs ≥ 195 μmol·g-1, Kf ≥ 1.9956) than that on BCs-600 (Qs ≤ 92 μmol·g-1, Kf ≤ 0.5192), thereby making the better immobilization effect of PPCPs by biochar. In addition, in the coexisting systems, either SMZ coexisting with CA/ACT on BCs-300, or ACT coexisting with CA/SMZ on BCs-600, both implied that when the |ΔpKa| between the target PPCPs and biochar is smaller than that between the coexisting compound and biochar, the target PPCPs can preferentially occupy the shared hydrogen bond sites on the biochar surface, and hard to be replaced by the coexisting compound. This work not only expand the application of designed biochar as engineering adsorbents to control and removal of the specific PPCPs in the environment, but also facilitate accurate assessment of the environmental risk of co-existing PPCPs.
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Affiliation(s)
- Nana Li
- Department of Environmental Science, School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China
| | - Yifan Liu
- Department of Environmental Science, School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China
| | - Cong Du
- Department of Environmental Science, School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China
| | - Yue Wang
- Department of Environmental Science, School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China
| | - Lijun Wang
- Department of Environmental Science, School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China; International Joint Research Centre of Shaanxi Province for Pollutants Exposure and Eco-environmental Health, Xi'an 710119, China
| | - Xiaoyun Li
- Department of Environmental Science, School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China; International Joint Research Centre of Shaanxi Province for Pollutants Exposure and Eco-environmental Health, Xi'an 710119, China.
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Zhang P, Gu N, Song L, Chen X, Du P, Zha L, Chen WH, Xiong J. The disappearing additive: introducing volatile ethyl acetate into a perovskite precursor for fabricating high efficiency stable devices in open air. NANOSCALE 2022; 14:5204-5213. [PMID: 35315464 DOI: 10.1039/d1nr08483f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
In recent years, organic-inorganic halide perovskite solar cells (PSCs) have attracted massive attention because of their high power conversion efficiency (PCE). However, it is difficult to prepare perovskite films with good performance in open air due to the poor stability of perovskite materials in high humidity, which is seriously hindering the practical application and development of PSCs. Herein, ethyl acetate (EA) is introduced into the perovskite precursor to enhance the crystallinity of perovskite for fabricating high efficiency stable devices in the atmospheric environment. Interestingly, volatile EA, which is often used as an anti-solvent, could quickly evaporate and accelerate the nuclei formation during perovskite crystallization. More impressively, the Lewis base nature of EA can form strong chemical bonding interactions with perovskite to passivate the defects during crystallization. As a result, the EA-modified perovskite film demonstrates dense and defect-less morphology with large grain size (the maximum achieves 0.9 μm). The EA-treated device has a dramatic efficiency of 19.53% and negligible hysteresis of the photocurrent. Furthermore, both the temperature and humidity resistances of EA-modified PSC are significantly improved. The normalized PCE of the EA-modified device without encapsulation can still retain over 80% of its initial value after being stored in 60% relative humidity (RH) in the dark for 500 hours. This contribution provides a promising channel for facilitating the commercialization of PSCs.
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Affiliation(s)
- Pengyun Zhang
- College of Textile Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018, China.
| | - Ningxia Gu
- College of Textile Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018, China.
| | - Lixin Song
- College of Textile Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018, China.
| | - Xiang Chen
- College of Textile Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018, China.
| | - Pingfan Du
- College of Textile Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018, China.
| | - Leying Zha
- College of Textile Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018, China.
| | - Wei-Hsiang Chen
- School of Science, Huzhou University, Huzhou, 313000, Zhejiang, China
| | - Jie Xiong
- College of Textile Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018, China.
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Dineshkumar P, Sahana R, Shanmugam R, Elangovan A, Sankaranarayanan R, Kumbharkhane A, Joshi Y, Arivazhagan G. Heteromolecular H –bond interaction forces and dielectric parameters: Time domain reflectometry studies. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2021.139272] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Iron Species-Supporting Hydrophobic and Nonswellable Polytetrafluoroethylene/Poly(acrylic acid-co-hydroxyethyl methacrylate) Composite Fiber and Its Stable Catalytic Activity for Methylene Blue Oxidative Decolorization. Polymers (Basel) 2021; 13:polym13101570. [PMID: 34068367 PMCID: PMC8153326 DOI: 10.3390/polym13101570] [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: 04/23/2021] [Revised: 05/10/2021] [Accepted: 05/11/2021] [Indexed: 12/03/2022] Open
Abstract
Polytetrafluoroethylene emulsion was ultrasonically mixed with an extremely spinnable poly(acrylic acid-co-hydroxyethyl methacrylate) solution to get a dispersion with good spinnability, and the obtained dispersion was then wet-spun into water-swellable fiber. Crosslinking agents and iron species were simultaneously introduced into the water-swellable fiber through simple impregnation and water swelling. A composite fiber with Fenton reaction-catalyzing function was then fabricated by sequentially conducting crosslinking and sintering treatment. Due to crosslinking-induced good resistance to water swelling and PTFE component-induced hydrophobicity, the composite fiber showed a highly stable activity to catalyze H2O2 to oxidatively decolorize methylene blue (MB). Within nine cycles, the composite fiber could decolorize more than 90% of MB within one minute in the presence of H2O2 and did not show any attenuation in MB decolorization efficiency. The composite fiber still could reduce the total organic carbon of MB aqueous solution from 18.3 to 10.3 mg/L when used for the ninth time. Therefore, it is believable that the prepared fiber has good and broad application prospects in the field of dye wastewater treatment.
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Kannan P, Karthick N, Sangeetha T, Shanmugam R, Elangovan A, Arivazhagan G. FTIR studies and DFT calculations on the associative nature of methyl cellosolve in binary solutions with acetonitrile. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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