GREEN CHEMISTRY
·
2020
·Vol. 22
·期 18
·5984-5988
·
IF 9.48
Yunchao Feng,Zheng Li,Sishi Long,Yong Sun,Xing Tang,Xianhai Zeng,Lu Lin
We report here that L-rhamnose, a less popular renewable and commercially available carbohydrate, can be used as a potential raw material to generate 5-methylfurfural (MF). In particular, nearly 100% yield of MF was achieved over 7 consecutive cycles in NaCl solution containing AlCl3 within 30 min, thus providing an alternative and industrializable way for the production of the potential bio-platform compound MF.
研究领域:
生物化学
·
可再生能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Haitao Xu,Dianhua Song,Jiao Li,Yan Zhao,Ruijie Yang,Jingzhe Zhao
The demand for sustainable energy sources urges the development of efficient and earth-abundant electrocatalysts . Herein, chlorine assisted ion-exchange and in-situ sulfurization processes were combined to construct CuCo 2 S 4 @(Cu,Co) 2 Cl(OH) 3 heterostructures from Cu(OH) 2 nanoarrays. Chlorine element in the cobalt source stimulated the formation of (Cu,Co) 2 Cl(OH) 3 precursor, and further facilitated partial transformation of the precursor to CuCo 2 S 4 on the surface to achieve composite structure. The mixed valences of Co element (Co 3+ in CuCo 2 S 4 and Co 2+ in (Cu,Co) 2 Cl(OH) 3 ) and O S interpenetrated nanointerface in the composite catalysts provided low electron transfer resistance for good alkaline oxygen evolution reaction (OER) activities. In 1 mol L −1 KOH electrolyte, the overpotentials of the optimal composite catalyst reached 253 and 290 mV respectively at the current density of 20 and 50 mA cm −2 , which is comparable to the activity of commercial Ir/C (281 mV@20 mA cm −2 ). These findings could provide opportunities for designing effective and inexpensive composite electrocatalysts through nanointerface engineering strategy.
研究领域:
材料科学
·
电化学
·
能源转换与存储
✓ 已验证
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Mingzhu Ren,Jing Wang,Zhengyang Wang,Sihan Sun,Jiakai Qiu,Yanchun Shi,Zhou-jun Wang,Yongbing Xie
Chlorobenzene is a typical toxic and persistent organic pollutant in wastewater and site polluted groundwater. In this study, powdered activated carbon (AC) was used for the adsorption of chlorobenzene from simulated wastewater, and it showed high adsorption capacity in a wide range of pH. Pseudo-second-order kinetic model and Langmuir isothermal adsorption model are suitable to describe the adsorption process . Furthermore, the adsorption mechanism is clarified by correlating the adsorption rate constants with the molecular descriptor by theory calculating. Chlorobenzene adsorption on AC was mainly controlled by π-π interaction and hydrophobicity , external mass transfer and intraparticle diffusion. Ozonation was adopted to regenerate the adsorption saturated AC and simultaneously avoid secondary solid waste. After three cycles of adsorption-ozonation, the adsorption capacity of AC even increased from 80 to 215 mg/g due to the increase of oxygen-containing functional groups on the AC surface. This mode can also be used for granular AC column adsorption, and ozonation partially restored the adsorption capacity. The work provides a better alternative way to deal with chlorobenzene polluted wastewater and groundwater.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 5
·2737-2756
·
IF 4.21
Shen Zhi,Cai Ning,Xue Yanan,Yu Bo,Wang Jianzhi,Song Hao,Deng Hang,Yu Faquan
Abstract A sustained release of anti-infection drugs is beneficial for the reduction of required dressing change times and the protection of the granulation tissue against further infection. In this work, the strategy of encapsulating mesoporous SBA-15 particles in a permeable cellulose membrane (CM) was used in the preparation of antibacterial cellulose based composite membranes to depot store and deliver drugs with prolonged anti-microbial drug release characteristics. It was found that SBA-15 with the protection of phosphate buffered saline prefilled in SBA-15 mesoporous channel could resist strong alkali environment during composite membranes preparation and its mesoporous structure remained intact, which was verified by SEM, TEM and BET results. The resultant cellulose based composite membrane containing 30 wt% SBA-15 (denoted as P-CM-SBA (30%)) had achieved 3.6 wt% drug loading and demonstrated the sustained release of chloramphenicol for 250 h, which was resulted from SBA-15/cellulose structure-inducing two-stage release behavior. Strong antibacterial activity of P-CM-SBA (30%) against S. aureus and E. coli . could last 144 h. In addition, the tensile strength, water vapor transmission rate and swelling properties of P-CM-SBA (30%) conformed to the primary requirements of wound dressing materials. Therefore, cellulose based composite membrane with 30 wt% SBA-15 particles possesses the potential for the application of wound healing. Graphic abstract
研究领域:
材料科学
·
生物医学工程
·
药剂学
✓ 已验证
DOI
高影响因子
Frontiers in Pharmacology
·
2020
·
IF 4.225
Chen Jianmin,Ye Yaling,Ran Mengnan,Li Qinglian,Ruan Zhipeng,Jin Nan
Inorganic mercury compounds have been used in skin-lightening products since ancient times. Although a previous study demonstrated that mercury impeded the transfer of Cu2+ to the apotyrosinase, the effect of mercury on tyrosinase is still unclear. In the present study, the mechanism of mercury chloride (HgCl2) induced inactivation of tyrosinase was investigated for the first time. The IC50 values were 29.97 and 77.93 μmol/L for monophenolase and diphenolase, respectively. A kinetic analysis revealed that HgCl2 inhibited tyrosinase activity in an irreversible non-competitive manner. The strong intrinsic fluorescence quenching suggested that the formation of the HgCl2-tyrosinase complex induced conformational changes of the enzyme, and HgCl2 had only one single binding site or a single class of binding site on tyrosinase. The molecular docking and further experiments demonstrated that HgCl2 bound to the amino residuals (His) in the catalytic center of tyrosinase. To our knowledge, these findings presented in this paper were the first evidence of the direct interactions between HgCl2 and tyrosinase, which provided a deep understanding of the inhibition mechanism of mercury on tyrosinase.
研究领域:
生物化学
·
毒理学
✓ 已验证
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 15
·15011-15018
·
IF 2.914
Yi Xianliang,Chi Tongtong,Li Zhaochuan,Wang Jianfeng,Yu Mingyue,Wu Minghuo,Zhou Hao
The combined effect of polystyrene (PS) particles and triphenyltin chloride (TPTCl) to the green algae Chlorella pyrenoido s a was studied. The 96 h IC 50 of TPTCl to the green algae C. pyrenoidosa was 30.64 μg/L. The toxicity of PS particles to C. pyrenoidosa was size-dependent, with the 96 h IC 50 at 9.10 mg/L for 0.55 μm PS but no toxicity observed for 5.0 μm PS. The exposure to 0.55 μm PS led to damage on structure of algal cells, which could in turn cause inhibition on photosynthesis and population growth of the green algae. TPTCl concentrations in test medium were lowered by 15–19% at presence of 0.55 μm PS particles, indicating a reduced bioavailability of TPTCl. In spite of this reduced bioavailability, the presence of PS increased the toxicity of TPTCl, which might be attributed to facilitated uptake of TPTCl by the green algae after the damage of cell structure. The overall results of the present study provided important information on the effect of PS on the bioavailability and toxicity of TPTCl to phytoplankton species.
研究领域:
环境科学
·
毒理学
✓ 已验证
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Zaichun Sun,Shaoyong Qin,Daichi Oka,Huijuan Zhang,Tomoteru Fukumura,Yuji Matsumoto,Bingchu Mei
Semitransparent and homogeneous bismuth oxychloride (BiOCl) thin films with (001) preferred orientation were synthesized on polycrystalline Sn:In2O3-glass substrates by mist chemical vapor deposition. The films showed photocathodic activity even under near-ultraviolet light within the band gap due to the in-gap states induced by oxygen vacancies. Higher synthesis temperatures resulted in a significant increase of photocurrent density under ultraviolet light. While the longer lifetime of photocarriers led to an increase of internal quantum efficiency, the larger band-edge absorption significantly contributed to the higher external quantum efficiency.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2016
·
IF 1.272
Wei-Fang Chen,Weiya Wang,Jinghui Zhang,Xiaomao Zhang,Yuxiang Li
Activated carbon, nano zerovalent iron (nZVI), and nano zerovalent iron/activated carbon (nZVI/AC) have all been found to be effective for hexachlorobenzene (HCB) removal either through adsorption, dechlorination, or both. Detailed investigations on the effects of several anions and cations normally present in aqueous streams on the removal of HCB were carried out to evaluate the potential performance of these materials in field treatment. Effects of ions were analyzed from the perspectives of changes in pH, ionic strength, and redox conditions. Results showed that ions that facilitate zerovalent iron corrosion, i.e. bicarbonate, chloride, chloride, ferrous, and copper, could greatly enhance HCB removal by nZVI, while HCB adsorption by activated carbon was more a factor of solution pH and ionic strength. The effects of ions on nZVI/AC were more complicated since both nZVI and activated carbon played a role in HCB removal. The results lead to a better understanding of HCB removal by these materials and could be employed in the consideration of choosing materials and prediction of treatment efficiency.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 38
·13336-13341
·
IF 7.059
Gaoping Xu,Leipeng Zhang,Bo Wang,Zichen Ren,Xi Chen,Shuliang Dou,Feifei Ren,Hang Wei,Xiaobai Li,Yao Li
Flexible polyaniline films doped by H2SO4–HClO4 multiple acids were synthesized, and for the first time, their electrochromic mechanism was studied via optical characterizations from the aspects of polarons and roughness. The electrochromic device based on the doped polyaniline films as the active material exhibits Δε of 0.47 in 8–14 μm and reflectivity higher than 80% in 250–400 nm, which can be integrated with the white snow environment in the UV-vis-infrared spectroscopy due to the sunlight scatter from the abundant micropores. In addition, the device exhibits a superior fast electrochromic behavior and stability of more than 200 cycles without compromising its performance. More importantly, the finite-element method and experimental results demonstrate that the device can achieve thermal management upon flat and twisted configuration. The flexible device shows promise for a broad range of potential applications in optical and thermal regulation systems.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Applications in Energy and Combustion Science
·
2023
·
IF 0
Cao Kuang,Mumin Rao,Xiangbo Zou,Jinchen Ma,Ji Ye,Shiwei Qin,Gongda Chen,Shuzhong Wang,Jun Zhao
This effort is to investigate three different Cu-based oxygen carriers (OCs) with polyvinyl chloride (PVC) and coal in chemical-looping combustion (CLC). The combustion process and synergetic analysis of PVC with coal were evaluated. There were four stages in the reaction of OCs with PVC, which HCl released from PVC could react with OCs at about 200–400 °C. CuO and CuO modified by limestone showed better immobilization of chlorine while CuO modified by iron ore and chrysolite inhibited the reaction of HCl with CuO. PVC char combustion temperature started at about 500 °C which were lower than that of coal char. The combustion efficiency of PVC CLC was all above 92%, except using Cu-Fe as OC which was about 88%. The presence of ZD in PVC showed positive effect on every stage. The addition of coal inhibited the reaction of HCl with CuO. The presence of PVC in ZD reduced the temperature of coal char and the addition of ZD in PVC increased the reaction rate. The synergistic effect was obvious between the PVC and coal blends which is beneficial for the complete combustion in solid fuel CLC
研究领域:
能源与燃料
·
环境科学
✓ 已验证
DOI
POLYMER
·
2023
·
IF 4.6
Changtong Song,Xianhong Zhang,Yuhong Ma,Wantai Yang
Developing internal-plasticized poly(vinyl chloride) (PVC) resin has been recognized as an effective way to deal with the issues of conventional PVC products such as toxicity and deterioration in properties caused by the migration of plasticizer . Herein, the copolymerization of vinyl chloride with commercial available poly(ethylene glycol) monomethyl ether methacrylate (PEGMA) is firstly conducted via suspension polymerization and internally plasticized random copolymers (PVEGA) are synthesized successfully. These PVEGA copolymers were intensively characterized by FTIR, 1 H NMR, GPC , DSC, DMTA , and SEM to determine the composition , number-average molecular weight ( M n ), dispersity, glass transition temperature ( T g ), and the micromorphology. As a result, the high transparency and the fracture images demonstrated the good compatability between PVC chains with long-chain polyether . The T g of PVEGA decreased gradually from 80 to 0 °C with the fraction of PEGMA in the copolymer increased from 7 to 37 %. Furthermore, the PVEGA copolymer exhibits outstanding processibility and mechanical performance. Under optimal composition , the tensile strength and the elongation at break can reach to 8 MPa and 525 %, respectively. Meanwhile, the PVEGA copolymers exhibit much lower migration either in water or in orgnic solvent and excellent performance in hemolysis and cytotoxicity, showing great application potential in medical devices .
研究领域:
材料科学
·
化学工程
·
生物医学工程
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 15
·22917-22924
·
IF 0
Liu Xunyue,Zhu Haojie,Song Wenyang,Rao Qiong,Xu Xiaoxiao
Chloramphenicol, a broad-spectrum antibiotic employed for controlling bacterial infections, presents an intriguing aspect in terms of its environmental fate in soils. 14 C-labeled chloramphenicol was used to explore its mineralization and residue characteristics in three distinct agricultural soils in China. The findings revealed a nuanced pattern in the fate of 14 C-chloramphenicol, with notable variations among the different soils under investigation. The chloramphenicol extract residue exhibited a reduction of 18.04% in sandy clay soil, 23.04% in clay loam soil, and 21.73% in loamy clay soil. Notably, the mineralization rate in sandy clay soil was 25.22% surpassed that in the other two soils, particularly during the initial stages of incubation. Over time, the diminishing extract residue underwent conversion into minerals and bound residue. The formation rate of bound residue was increased from 44.59 to 53.65% after adding 10% manure, suggesting that chloramphenicol easily binds with soils rich in organic matter. The bound residue is predominantly localized in the humin fraction across all soils. Additionally, the sterilized soil experiments indicated the pivotal role of microorganisms in influencing the fate of chloramphenicol under the specified experimental conditions. In conclusion, this study offers valuable insights into the environmental dynamics of chloramphenicol in soils, emphasizing the importance of soil composition, organic matter content, and microbial activity. The findings contribute to a scientific understanding of the environmental safety implications associated with chloramphenicol usage.
研究领域:
环境科学
·
土壤学
·
微生物学
·
药理学
·
农业化学
✓ 已验证
DOI
危险品化学品经营许可证（带存储）