CHEMOSPHERE
·
2024
·
IF 8.1
Juan Qiao,Zhenyu Zhao,Zhengwei Zhou,Deli Wu
Palladized iron (Pd/Fe) represents one of the most common modification strategies for nanoscale zero-valent iron (nZVI). Most studies prepared Pd/Fe by reducing iron salts and depositing Pd species on the surface of pre-synthesized nZVI, which can be called the two-step method. In this study, we proposed a one-step method to obtain Pd/Fe by the concurrent formation of Fe 0 and Pd 0 and investigated the effects of these two methods on 4-chlorophenol (4-CP) removal, with carboxymethylcellulose (CMC) coated as a surface modifier. Results indicated that the one-step method, not only streamlined the synthesis process, but also Pd/Fe-CMC one-step , synthesized by it, exhibited a higher 4-CP removal rate (97.9%) compared to the two-step method material Pd/Fe-CMC two-step (82.4%). Electrochemical analyses revealed that the enhanced activity of Pd/Fe-CMC one-step was attributed to its higher electron transfer efficiency and more available reactive species, active adsorbed hydrogen species (H ads *). Detection of intermediate products demonstrated that, under the influence of Pd/Fe-CMC one-step , the main route of 4-CP was through hydrodechlorination (HDC) to form phenol and H* was the main active specie, supported by EPR tests, quenching experiments and product analysis. Additionally, the effects of initial 4-CP concentration, initial pH, O 2 concentration, anions such as Cl − , SO 4 2− , HCO 3 − , and humic acid (HA) were also investigated. In conclusion, the results of this study suggest that Pd/Fe-CMC one-step , synthesized through the one-step method, is a convenient and efficient nZVI-modifying material suitable for the HDC of chlorinated organic compounds.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Hongxi Zhang,Zhongke Li,Shuyu Tang,Xiande Yang,Meng li,Jing Yang,Liang Wei
This study examines the use of tetrabutylammonium tetrafluoroborate (TBABF 4 ) as a catalyst for the depolymerization of lignin and its model compound without the addition of oxidants. The impact of electrolytes, reaction times, and solvents on the cleavage of the α-O-4 bond in lignin is investigated. The experimental setup includes specific conditions such as the use of carbon cloth (CC) as the counter electrode and a platinum plate as the working electrode. The TBABF 4 catalyst effectively cleaved the α-O-4 bond in the lignin model molecule with notable selectivity and minimal formation of by-products, resulting in a substantial conversion rate of benzyl phenyl ether (95.7 %) and a high yield of benzaldehyde dimethyl aceta (92.4 %) under specific conditions. This investigation showcases a mild electrochemical catalytic depolymerization approach for lignin model molecules at ambient temperature, thereby presenting novel avenues for further exploration in the field.
研究领域:
化学工程
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可再生资源利用
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2016
·Vol. 18
·期 6
·1-11
·
IF 2.101
Li Runming,Li Zhiyuan,Wu Qiang,Li Dongfeng,Shi Jiahua,Chen Yuewen,Yu Shuling,Ding Tao,Qiao Congzhen
Abstract Oxidative polymerization of aniline was carried out in ethanol using chloroauric acid (HAuCl 4 ) as the oxidant. Simultaneous reduction of HAuCl 4 and formation of gold nanoparticles (AuNPs) and polyaniline (PANI) composite nanospheres (AuNPs@PANI nanospheres) were achieved without using any templates or structure-directing agents. The composite nanospheres are uniformly distributed with an average diameter of about 400 nm, in which the ultrafine AuNPs with size of about 2–4 nm were evenly embedded in the PANI matrix which acted as the dispersing agent and stabilizer of AuNPs. In addition, the catalytic performance of these composite nanospheres towards the reduction of 4-nitrophenol in the presence of NaBH 4 was studied. Furthermore, the possible formation mechanism and catalytic mechanism of the self-assembled AuNPs@PANI nanospheres were also discussed. Graphical Abstract
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
PROCEEDINGS OF THE COMBUSTION INSTITUTE
·
2024
·
IF 5.3
Wen-luan Xie,Bin Hu,Xiao Yang,Ji Liu,Zhi-mo Fang,Kai Li,Yang-wen Wu,Bing Zhang,Qiang Lu
Phosphoric acid is an effective and widely used catalyst for biomass pyrolysis, with significant catalytic impact on the pyrolytic reactions and product distribution. However, its fundamental catalytic mechanism in lignin pyrolysis remains unclear. In this work, we proposed and investigated three possible H 3 PO 4 -assisted pyrolysis mechanisms, i.e., hydrogen-bond-induced decomposition, phosphoric-acid-assisted hydrogen transfer (H 3 PO 4 -AHT), and phosphorolysis, and carefully discussed them through theoretical calculations, electronic structure analyses, catalytic pyrolysis experiments using the β -O-4 linked lignin model. The results indicated that the H 3 PO 4 -AHT mechanism played a dominant role in lignin catalytic pyrolysis, superior to the other two mechanisms. The phosphoric acid molecule could take advantage of its unsaturated P = O and saturated P −OH groups for hydrogen donation and acceptance in concerted H 3 PO 4 -AHT reactions. Alternatively, it could also participate in concerted intermolecular hydrogen transfer with the active hydroxyl group as a mediator. The C β −O bond cleavage could be significantly enhanced by effectively reducing the tension of the transition state ring, leading to the generation of more phenol and styrene in pyrolysis experiments. Due to the inhibition of hydrogen abstraction, C α −C β breakage of β -O-4 linkage, side chain removal of primary products, etc., the formation of other products in phosphoric acid catalytic pyrolysis of β -O-4 linked lignin was restrained. This H 3 PO 4 -AHT catalytic mechanism was also confirmed to be conductive to tautomerism, elimination, dehydration, α -O-4 linkage fracture, β -1 linkage fracture, and other important decomposition reactions in lignin pyrolysis. The understanding of these mechanisms provides valuable insights into the role of phosphoric acid in lignin pyrolysis and may guide the development of effective biomass catalytic conversion methods.
研究领域:
化学工程
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生物质能
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催化科学
✓ 已验证
DOI
高影响因子
Solar RRL
·
2021
·Vol. 5
·期 7
·2100181
·
IF 8.582
Yali Sun,Pengfei Qiu,Siyu Wang,Hongling Guo,Rutao Meng,Xiaowei Zhou,Li Wu,Wei Yu,Jianping Ao,Yi Zhang
Cu 2 ZnSn(S,Se) 4 are emerging as promising photovoltaic materials due to their outstanding photoelectrical performances, benign grain boundaries, and Earth-abundant constituent elements. However, there are largely distributed cation-disordering defects and defect clusters, which lead to an increase in recombination and a large open-circuit voltage deficit and thus deteriorate device performance. Herein, defect control for a high-efficiency Cu 2 ZnSn(S,Se) 4 solar cell by atomic layer deposition of aluminum oxide (ALD-Al 2 O 3 ) on the precursor film is reporter. Cu Zn defects and Sn-related deep defects are largely suppressed because of the decrease in Sn 2+ and the increase in Sn 4+ in the film by ALD-Al 2 O 3 on the precursor are found, and the crystallinity of absorber layer is improved from a double-layer structure to a completely single-layer structure. Furthermore, the carrier lifetime and recombination in the bulk and interface are significantly improved for devices with ultrathin Al 2 O 3 . Using this approach, the conversion efficiency increases from 8.8% to 11.0% and the open-circuit voltage deficit decreases from 0.621 to 0.577 V. Herein, a deep understanding of the relationship between Al 2 O 3 incorporation and high-efficiency Cu 2 ZnSn(S,Se) 4 devices and a new direction for controlling defects to further improve the performance of kesterite solar cells are provided.
研究领域:
材料科学
·
太阳能电池研究
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-8
·
IF 2.584
Yan Xinyu,Wang Kan,Lu Wenting,Qin Weijian,Cui Daxiang,He Jinghua
Carbohydrate antigen 72-4 (CA72-4) is an important biomarker associated closely with diagnosis and prognosis of early gastric cancer. How to realize quick, sensitive, specific, and quantitative detection of CA72-4 in clinical specimens has become a great requirement. Herein, we reported a CdSe/ZnS quantum dot-labeled lateral flow test strip combined with a charge-coupled device (CCD)-based reader was developed for rapid, sensitive, and quantitative detection of CA72-4. Two mouse monoclonal antibodies (mAbs) against CA72-4 were employed. One of them was coated as a test line, while another mAb was labeled with quantum dots and coated onto conjugate pad. The goat anti-mouse IgG was immobilized as a control line. After sample was added, a sandwich structure was formed with CA72-4 and these two mAbs. The fluorescent signal from quantum dots (QD)-labeled mAb in sandwich structure was related to the amount of detected CA72-4. A CCD-based reader was used to realize quantitative detection of CA72-4. Results showed that developed QD-labeled lateral flow strips to detect CA72-4 biomarker with the sensitivity of 2 IU/mL and 10 min detection time. One hundred sera samples from clinical patients with gastric cancer and healthy people were used to confirm specificity of this strip method; results showed that established strip method own 100 % reproducibility and 100 % specificity compared with Roche electrochemiluminescence assay results. In conclusion, CdSe/ZnS quantum dot-labeled lateral flow strips for detection of CA72-4 could realize rapid, sensitive, and specific detection of clinical samples and could own great potential in clinical translation in near future.
研究领域:
医学诊断
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生物化学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
SOLAR ENERGY
·
2021
·
IF 5.742
Yulin Liu,Bin Xu,Xiaoshuang Lu,Xiatong Qin,Pingxiong Yang,Junhao Chu,Ye Chen,Lin Sun
Excellent crystallinity and uniform composition distribution of the Cu 2 ZnSn(S,Se) 4 (CZTSSe) absorber are indispensable factors for the fabrication of photovoltaic device with excellent performance. Here, a facile and effective method is developed to improve the composition uniformity of CZTSSe absorber. It is inspiring that by replacing the acetates with chlorides as the solutes in the precursor solution , the issue of the composition non-uniformity especially for the distribution of Cu and Sn, which is ascribed to the rich-carbon in the acetate-based CZTSSe absorber, is able to be avoided. Due to less organic residues and composition uniformity, the grain size and the crystallinity of absorber could be significantly enhanced, and the photovoltaic performance of chloride-based CZTSSe solar cell is improved remarkably. Furthermore, substituting CuCl 2 with CuCl as the copper source in the precursor solution is able to obtain a stable solution, and the quality of CZTSSe absorber is further improved. As a consequence, 8.48% efficient CZTSSe solar cell has been yield.
研究领域:
材料科学
·
太阳能电池
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 7
·2197-2203
·
IF 4.831
Hao Tongfan,Wei Xiao,Nie Yijing,Xu Yeqing,Yan Yongsheng,Zhou Zhiping
We on report an eco-friendly molecularly imprinted material based on carbon dots (C-dots) via a facile and efficient sol–gel polymerization for selective fluorescence detection of 4-nitrophenol (4-NP). The amino-modified C-dots were firstly synthesized by a hydrothermal process using citric acid as the carbon source and poly(ethyleneimine) as the surface modifier, and then after a sol–gel molecular imprinting process, the molecularly imprinted fluorescence material was obtained. The material (MIP-C-dots) showed strong fluorescence from C-dots and high selectivity due to the presence of a molecular imprint. After the detection conditions were optimized, the relative fluorescence intensity (F 0 /F) of MIP-C-dots presented a good linearity with 4-NP concentrations in the linear range of 0.2 − 50 μ mol L -1 with a detection limit (3σ/k) of 0.06 μmol L -1 . In addition, the correlation coefficient was 0.9978 and the imprinting factor was 2.76. The method was applicable to the determination of trace 4-NP in Yangtze River water samples and good recoveries from 92.6–107.3 % were obtained. The present study provides a general strategy to fabricate materials based on C-dots with good fluorescence property for selective fluorescence detection of organic pollutants.
An eco-friendly molecularly imprinted fluorescence sensor based on carbon dots (C-dots) (poly(ethyleneimine) (PEI) as the surface modifier) was prepared via a facile and efficient sol–gel polymerization (3-aminopropyltriethoxysilane (APTES) as the functional monomer and tetramethoxysilane (TEOS) as the cross linker) for selective fluorescence detection of 4-nitrophenol (4-NP).
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2013
·
IF 4.387
Hongbo Li,Jing Li,Qin Xu,Zhanjun Yang,Xiaoya Hu
A novel visible light sensitized photoelectrochemical sensing platform was constructed based on the perylene-3,4,9,10-tetracarboxylic acid/titanium dioxide (PTCA/TiO 2 ) heterojunction as the photoelectric beacon. PTCA was synthesized via facile steps of hydrolysis and neutralization reaction, and then the PTCA/TiO 2 heterojunction was easily prepared by coating PTCA on nano-TiO 2 surface. The resulting photoelectric beacon was characterized by transmission electron microscope, scanning electron microscopy, X-ray diffractometry, FTIR spectroscopy, and ultraviolet and visible spectrophotometer. Using parathion-methyl as a model, after a simple hydrolyzation process, p-nitrophenol as the hydrolysate of parathion-methyl could be obtained, the fabricated derivative photoelectrochemical sensor showed good performances with a rapid response, instrument simple and portable, low detection limit (0.08 nmol L −1 ) at a signal-to-noise ratio of 3, and good selectivity against other pesticides and possible interferences. It had been successfully applied to the detection of parathion-methyl in green vegetables and the results agreed well with that by GC–MS. This strategy not only extends the application of PTCA, but also presents a simple, economic and novel methodology for photoelectrochemical sensing.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHARMACOLOGY AND EXPERIMENTAL THERAPEUTICS
·
2025
·
IF 3.8
Jin Feng,Qian Yang,Ming Chen,Long Ning,Yan Wang,Dan Luo,Dongxiong Hu,Qing Lin,Fangyan He
Background The active ingredient of Gastrodia elata , 4-hydroxybenzaldehyde (4-HBd), can rapidly enter the brain and undergo massive oxidation to produce the metabolite 4-hydroxybenzoic acid (4-HBA), which has no significant activity after equal dose gavage. It is crucial to clarify the metabolic pathway of 4-HBd and its correlation with the anti IS mechanism. Objective To explore the possible mechanism of 4-HBd in clearing ROS and protecting BBB from oxidative stress damage during brain metabolism from the perspective of ROS response. Method A rat model of cerebral ischemia-reperfusion injury and a cellular oxidative stress response model were replicated to simulate the accumulation process of ROS in the brain. The changes in ROS and peroxidation products before and after 4-HBd intervention were detected, and the changes in oxidative metabolism were also measured to confirm the correlation between antioxidant stress damage and ROS capture/clearance in oxidative metabolism. Result 4-HBd has significant antioxidant stress resistance both in vitro and in vivo, and can reduce the levels of MDA and 4-HNE in ischemic brain tissue. It can capture O2·- and ·OH in vitro and use the captured ROS to oxidize and metabolize 4-HBA. Conclusion The oxidative metabolism process of 4-HBd in the brain is one of its mechanisms for exerting antioxidant stress damage and protecting BBB.
研究领域:
药理学
·
神经科学
·
药物化学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2015
·
IF 3.615
Shuang Fan,Yi Luan,Jingjing Wang,Hongyi Gao,Xiaowei Zhang,Ge Wang
A novel ferric chloride immobilized poly(4-vinylpyridine) (P4VP) catalyst was developed via a coordination chemistry-based approach. The pyridine moiety of poly(4-vinylpyridine) spheres functioned as the nitrogen donor to bind iron ions, as well as to decrease the amount of pyridine used in the catalytic reaction system. The monodispersed catalyst was well dispersed in the organic solvent during the catalytic procedure, taking advantage of its nanomorphology and uniform size. The catalytic activity of various monodispersed catalysts based different mass fractions of the divinylbenzene (DVB) was investigated, meanwhile the capacities of supported Fe(III) in the various catalysts were also discussed. The P4VPDVB 10% -Fe(III) catalyst exhibited high catalytic activity in the benzylic oxidation of benzylic methylenes and secondary benzylic alcohols. It was easily separated from the reaction system and reused several times without obvious degradation of catalytic activity. Moreover, leaching tests suggested that the as-synthesized P4VPDVB 10% -Fe(III) catalyst was a true heterogeneous catalyst without significant metal leaching.
研究领域:
化学
·
催化材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2025
·
IF 6
Xinliang Liu,Kuan Cai,Ziyi Zhong,Jiulong Sha,Xingxiang Ji,Parikshit Gogoi,Hainong Song,Shuangfei Wang,Jinge Guo
The peroxydisulfate (PDS)-based advanced oxidation process (AOP) has attracted great attention as an effective technique for oxidatively decomposing organic pollutants. g-C 3 N 4 , an excellent photocatalyst, has been studied to activate PDS, but the rapid photogenerated electron-hole recombination severely impedes its photocatalytic performance. Herein, highly efficient point-defect engineering by doping atoms as well as vacancies was adopted to modulate photoinduced exciton dissociation kinetics. We successfully synthesized C-doped carbon nitride (xC-g-C 3 N 4 ) by a one-step copyrolysis method using glucose and melamine as raw materials. C-doped carbon nitride can act as an electron bridge for electron transfer, leading to xC-g-C 3 N 4 with a wider light absorption range (from 475 nm to 527 nm), narrower band gap (from 2.76 eV to 2.66 eV) and higher charge separation efficiency (from 3.79 μA/cm 2 to 3.22 μA/cm 2 ). The enhanced visible light absorption performance and the reduced electron-hole pair recombination rate of xC-g-C 3 N 4 can efficiently initiate PDS. The obtained xC-g-C 3 N 4 catalyst exhibited superior photocatalytic activation performance of PDS for 4-CP degradation under visible light illumination. The degradation rate of 4-CP reached 88.3 %, with a total organic carbon (TOC) removal rate of approximately 87.9 %, which increased by 67.9 % and 160 %, respectively. This study highlights a new effective method of carbon doping in g-C 3 N 4 for activating PDS in the degradation of 4-CP.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）