INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Mingchen Yang,Yi Chen,Somia Yassin Hussain Abdalkarim,Xuefei Chen,Hou-Yong Yu
The performance of cellulose-based materials is highly dependent on the choice of solvent systems. Exceptionally, cellulose dissolution and derivatization by efficient solvent have been considered as a key factor for large-scale industrial applications of cellulose. However, cellulose dissolution and derivatization often requires harsh reaction conditions, high energy consumption, and complex solubilizing, resulting in environmental impacts and low practical value. Here we address these limitations by using a low-temperature oxalic acid/sulfuric acid solvent to enable cellulose dissolution and derivatization for high-performance cellulose films . The dissolution and derivatization mechanism of the mixed acid is studied, demonstrating that cellulose is firstly socked by oxalic acid , then more hydrogen bonds ionized by sulfuric acid break cellulose chain, and finally the esterification reaction between oxalic acid and cellulose is catalyzed by sulfuric acid. Solutions containing 8 %–10 % cellulose are obtained and can be stored for a long time at −18 °C without significant degradation. Moreover, the cellulose film exhibits a higher tensile strength of up to 66.1 MPa, thermal stability, and degree of polymerization compared to that fabricated by sulfuric acid. These unique advantages provide new paths to utilize renewable resources for alternative food packaging materials at an industrial scale.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Jingjing Jiang,Chenli Yue,Ziqing Zhao,Di Wu,Shengda Liu,Yanan Zhang,Bowen Zhao,Zhenhao Zhao,Yansong Liu,Cong Lyu,Chongjun Zhang,Mingxin Huo,Dandan Zhou,Shuangshi Dong
Breaking hydrogen bond in metal free carbon nitride (CN) to increase peroxymonosulfate (PMS) adsorption for surface-mediated electron transfer has been challenging. Herein, we incorporated N−C N monomer into CN to break hydrogen bond by the introduction of polyvinylpyrrolidone (PVP). The developed nonradical oxidation system achieved selective decomposition of highly hydrophilic contaminants and efficient removal of chemical oxygen demand (58.0%), total phosphorus (88.1%), ammonia nitrogen (100.0%) and total nitrogen (67.8%) from the secondary effluent in a continuous flow reactor. This was attributed to that the breakage of hydrogen bond accelerated the redistribution of electron densities at C and N sites, leading to an increase in the adsorption energy of N site to PMS. This promoted the formation of PVP/CN-PMS* complex for the selective and efficient removal of organics and inorganics. This work provided a new perspective for the selective and long-term treatment of practical wastewater.
研究领域:
环境科学
·
材料化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-10
·
IF 15.7
Wei Fen,Zhao Jiwu,Liu Yu-Chun,Hsu Yung-Hsi,Hung Sung-Fu,Fu Junwen,Liu Kunlong,Lin Wei,Yu Zhiyang,Tan Li,Lu Xue Feng,Feng Chengyang,Zhang Huabin,Wang Sibo
Lattice oxygen-mediated photocatalytic ethane dehydrogenation represents a sustainable strategy for ethylene production, yet achieving a balance between high productivity, selectivity, and durability remains challenging. Here, we report a defective NiO-300 catalyst, where precisely engineered Ni vacancies activate lattice oxygen by weakening Ni–O bond and improving lattice oxygen mobility. This promotes efficient ethane activation and C–H bonds cleavage through photoinduced hole capture, intensifying ethane dehydrogenation via a light-boosted Mars-van Krevelen mechanism. The NiO-300 catalyst manifests a high ethylene yield of 604.5 μmol g −1 h −1 with 100% selectivity and stability over 200 cycles. In situ spectroscopic and theoretical studies elucidate the generation of active oxygen species, the evolution of Ni coordination, the formation of key intermediates, and the underlying photocatalytic mechanism. Our findings highlight cation vacancy engineering as a powerful tactic to fully activate lattice oxygen for solar-driven alkene production from alkane dehydrogenation over oxide photocatalysts.
研究领域:
催化
·
材料科学
·
化学工程
·
物理化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Binlin Chen,Yueqi Deng,Qingjing Niu,Kongying Zhu,Lixia Ren,Xiaoyan Yuan
Ice formation poses a significant challenge across various fields, from industrial processes to biological preservation. Developing antifreeze agents and recognizing the antifreeze mechanism have gained considerable attention. Herein, a series of poly(l-methionine) derivatives, poly(S-carboxymethyl-l-methionine sulfonium) (PMetA), poly(S-methyl-l-methionine sulfonium chloride) (PMetM), and poly(S-carbamidomethyl-l-methionine sulfonium chloride) (PMetAM), with carboxyl, methyl, and acetamide groups, respectively, are synthesized and investigated for antifreeze. The relationship between the polymer structure and the ice recrystallization inhibition (IRI) activity is examined, suggesting that zwitterionic PMetA shows the highest IRI activity, about 27.0 ± 3.9% at 10 mg mL–1 relative to that of water. Results of low-field nuclear magnetic resonance and differential scanning calorimetry indicate that the IRI activity is associated with the activation energy for hydrogen bond breakage. PMetA exhibits acceptable cytocompatibility at 10.0 mg mL–1 and a good cryoprotective efficiency. This finding provides a valuable insight into the antifreeze mechanism, contributing to the development of potent cryoprotectants.
研究领域:
材料科学
·
生物物理学
·
低温生物学
·
聚合物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）