CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wenqian Cao,Yumeng Qi,Ying Zhang,Ruixue Guo,Ruijuan Qu,Zunyao Wang
Photolysis is the main pathway for the degradation of persistent organic pollutants (POPs). Most investigations, however, have been limited to the ultraviolet or visible region, and the reaction mechanism of infrared (IR) light is still unclear. In this study, the photodegradation of o,p' -dichlorodiphenyltrichloroethanes ( o,p' -DDT) on the silica (SiO 2 )/air interface under different irradiation light sources was systematically investigated. Interestingly, for the first time, effective degradation of o,p' -DDT under IR light irradiation was observed, which was ascribed to the anti-Stokes Raman scattering process of SiO 2 . Moreover, desert sands could also serve as a vector for the photodegradation of o,p' -DDT. The lower removal efficiency of desert sands compared to pure SiO 2 was a combined effect of differences in Fe 3+ component and SiO 2 content. It is worth noting that direct photodegradation plays a dominant role in the photodegradation of o,p' -DDT on SiO 2 . Besides, indirect photodegradation resulted mainly from •OH (25.0%), O 2 • − (6.9%), and 1 O 2 (5.6%) generated in the reaction system. In addition to hydroxylation and dechlorination products, the formation of four novel silicon-based products was observed, which resulted from the direct reaction of silyl radicals with o,p' -DDT. This study revealed that the specific Raman scattering effect of SiO 2 played a vital role in the self-purification process of POPs upon SiO 2 -based environmental matrices. The light-mediated decontamination system upon SiO 2 constructed in this study could provide critical information for addressing POPs contamination on sands.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2015
·
IF 4.513
Yuhan Zhu,Kai Yan,Yong Liu,Jingdong Zhang
A photoelectroactive film composed of CdS quantum dots and graphene sheets (GS) was coated on F-doped SnO 2 (FTO) conducting glass for studying the electrochemical response of p -phenylenediamine (PPD) under photoirradiation. The result indicated that the cyclic voltammogram of PPD on CdS–GS hybrid film became sigmoidal in shape after exposed under visible light, due to the photoelectrocatalytic reaction. Such a photovoltammetric response was used to rapidly optimize the photoelectrocatalytic activity of hybrid films composed of different ratios of CdS to GS toward PPD. The influences of scan rate and pH on the photovoltammetric behavior of PPD on CdS–GS film revealed that although the controlled step for electrochemical process was not changed under photoirradiation, more electrons than protons might participate the photoelectrocatalytic process. Furthermore, the photoelectroactive CdS–GS hybrid film was explored for PPD determination based on the photocurrent response of film toward PPD. Under optimal conditions, the photocurrent signal on CdS–GS film was linearly proportional to the concentration of PPD ranging from 1.0 × 10 −7 to 3.0 × 10 −6 mol L −1 , with a detection limit (3S/N) of 4.3 × 10 −8 mol L −1 . Our work based on CdS–GS hybrid film not only demonstrated a new facile photovoltammetric way to study the photoinduced electron transfer process of PPD, but also developed a sensitive photoelectrochemical strategy for PPD determination.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
THERMOCHIMICA ACTA
·
2017
·
IF 2.236
Pei Xu,Xiao Luo,Yiyang Zhou,Youwen Yang,Yunsheng Ding
To investigate the effect of modified graphene (Gra) by poly(methoxy poly(ethylene glycol) monomethacrylate-co-1-vinyl-3-ethylimidazolium bromide) (P[MPEGMA-IL]) on crystallization and dielectric behavior for poly(lactic acid) (PLA), the neat PLA and its composites were fabricated via solution blending and hot pressing. P[MPEGMA-IL] can improve the dispersibility of Gra in PLA matrix. The crystallization rate of PLA composites was increased with increasing the content of P[MPEGMA-IL] and Gra due to the plasticizing effect of P[MPEGMA-IL] and the nucleating effect of better-dispersed Gra. In the frequency spectra of PLA composites treated by cold crystallization process, α relaxation and interfacial polarization resulted in high values of dielectric permittivity. The incorporation of modified Gra into the matrix can accelerate interfacial polarization. The effect of modified Gra on charge carrier movement mechanism was resulted from the increase of the mobile charge carriers at the interphase and the dielectric strength of interfacial polarization.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 7
·4083-4090
·
IF 11.301
Jin Liu,Xingcai Zhang,Qian Zhong,Jun Li,Hongzhang Wu,Bo Zhang,Lin Jin,Hua Bing Tao,Bin Liu
Semiconductor p–n junction engineering plays an indispensable role in developing highly efficient photocatalysts for energy conversion and environmental remediation. Herein, a novel AgI/Bi2Ga4O9 p–n junction photocatalyst is successfully constructed by an electrostatic self-assembly approach. Photoelectrochemical characterization together with density functional theory calculations shows that the formation of a p–n junction at the AgI/Bi2Ga4O9 interface favors separation and transfer of photogenerated charge carriers. The ˙O2− generated by 25%-AgI/Bi2Ga4O9 reaches a concentration of 18.8 μmol L−1 after 60 min of irradiation, which is 3.3 and 12.5 times higher than that generated by AgI and Bi2Ga4O9, providing 25%-AgI/Bi2Ga4O9 with greatly enhanced photocatalytic activity toward Acid Red 1 and metronidazole degradation. Our work provides a novel strategy for designing highly efficient photocatalysts for a wide range of energy and environmental applications.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xianwei Li,Shuangxiu Ma,Fang Luo,Zehui Yang
Electrochemical hydrogenerations of nitrogen and oxygen molecules are of significance for nitrogen reduction and oxygen reduction reactions. Strengthening the binding between active sites and gaseous molecules is beneficial for enhancing the catalytic performance, especially in NRR catalysis. In this work, we have engineered the oxygen vacancies in Co 3 O 4 nanoparticles to boost the catalytic activity towards NRR and ORR. Ascribing to the p-d hybridization between Co and N atoms, N 2 electrochemical adsorption is promoted and the related energy barrier of N 2 protonation is significantly decreased by 50%; as a consequence, Faradaic efficiency is 11.2% at −0.4 V vs. RHE, 3-fold higher than Co 3 O 4 /CNT; moreover, due to the oxygen vacancies in Co 3 O 4-x /CNT leading to a higher oxophilicity, Co 3 O 4-x /CNT showed a better selectivity in ORR catalysis and kinetic current density at 0.85 V vs. RHE is boosted by 2.4 times. Consequently, Co 3 O 4-x /CNT exhibits a better rechargeable zinc air battery performance than Pt/C-IrO 2 by a factor of 2.2.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Shan Zhang,Yupeng Lu,Yahao Geng,Yixin Yin,Guiyong Xiao
Hydroxyapatite (HA) is an important component of mammalian bones and teeth. Its superior biocompatibility, biological activity, and bone tissue regenerative properties make it an ideal material for bone tissue replacement and regeneration. The morphological characteristics of HA can affect its selection in various applications. In contrast, one-dimensional (1D) micro/nano-structured HA has received widespread attention in the field of biomedicine. In particular, HA ultra-long nanofibers possess excellent mechanical properties, such as flexibility and deformability, overcoming the brittleness of traditional HA ceramic materials. This work successfully synthesized HA ultra-long nanofibers using oleic acid as a template by a solvothermal method. Particularly, the effects of the initial Ca/P ratios (iCa/P) on the morphologies of HA products were investigated. The microstructure and properties of HA products were characterized by scanning electron microscopy (SEM), X-ray powder diffractometer (XRD) and Fourier transform infrared spectroscopy (FTIR). The results indicated that the uniform and flexible HA nanofibers can be obtained only under the appropriate iCa/P. In addition, the effect of iCa/P on the microstructures of the HA formation stages was investigated using transmission electron microscopy (TEM), and then the formation mechanism of HA nanofibers was proposed. In this process, it is found that HA nanofibers mainly grow selectively along the c-axis, while iCa/P precisely influences the preferential growth direction of HA products.
研究领域:
生物材料学
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医学
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产品关联
DOI
高影响因子
ENERGY & FUELS
·
2022
·
IF 4.654
Shuyue Xu,Yibo Zhao,Wenjing He,Lu Chang,Mingyan Wang,Cheng Wang,Kean Wang,Minjie Cui,Yuchen Zhang
In this study, N-doped carbon nanofibers were prepared by carbonization using p-phenylenediamine (PPD)-modified polyaniline nanofibers as precursors. The effects of PPD dosage, carbonization temperature, and potassium hydroxide (KOH) dosage on the performance of carbonized products were investigated in detail. The uniformity of the carbon nanofiber networks improved considerably using 2% PPD. Consequently, the specific capacitance of the carbon nanofibers at 0.5 A/g was enhanced by 42.5%. In addition, KOH activation increased the specific capacitance of the carbonized product to 273.3 F/g at 0.5 A/g. The product exhibited a lifespan of up to 4500 cycles with 87.2% retention. Remarkably, when the mass loading was increased to 16 mg/cm2, the product still possessed a high specific capacitance of 254 F/g at 0.5 A/g.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Cell Reports Physical Science
·
2024
·
IF 7.9
Ruihao Ma,Xiangjun Xu,Bowen Jin,Siwen Liu,Jinguo Cao,Shimin Wang,Erjing Wang,Liang Chu,Congcong Wu
Developing sufficient dynamics for charge separation and transfer is critical to improve photovoltaic performance. Normally, dynamics can be modulated by band bending via surface engineering, but this has typically been negligible in the p-n homojunction for boosted perovskite solar cells. Herein, we adopt carbon dots as an addition to induce a bilayer p-n perovskite homojunction to improve interfacial charge transfer within perovskite solar cells. Notably, the inclusion of carbon dots induces the spontaneous assembly of a bilayer structure, where the upper layer is enriched with dots and the underlying layer remains pristine perovskite. This unique arrangement creates a p-n homojunction, accompanied by an internal electric field, which allows for modulating energy levels and facilitating charge-carrier separation and transfer. Benefiting from the p-n homojunction, the power conversion efficiency of the perovskite solar cells increases from 18.57% to 21.09%. Additionally, the hydrophobic nature of the carbon dots considerably enhances the humidity stability of the solar cells.
研究领域:
材料科学
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能源技术
·
光电转换
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2011
·Vol. 29
·期 3
·288-295
·
IF 0.478
Xu Gao-fei,Zhu Wei-pu
P(AA-MA) copolymers composed of acrylic acid and methyl acrylate with different molecular weights and sequence structures were synthesized by combination of ATRP and selective hydrolysis. These copolymers were used as membrane materials to separate benzene/cyclohexane mixture by pervaporation. The effects of molecular weight and sequence structure of the copolymers on the pervaporation performance were investigated in detail. For the random copolymers, the permeate flux decreased rapidly with the increasing of molecular weight. The separation factor was also influenced by the molecular weight, which was changed from no selectivity to cyclohexane selectivity with increasing the molecular weight. Contrarily, the block copolymer membrane showed good benzene selectivity with separation factor of 4.3 and permeate flux of 157 g/(m 2 h) to 50 wt% benzene/cyclohexane mixture.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Fanshu Xiang,Baokang Jin
The direct carboxylation of organic halides under CO 2 atmosphere by electrochemical reduction is an effective way to realize the value utilization of waste (CO 2 ), and has great potential in green organic synthesis. P-nitrophenylacetic acid is a chemical raw material in great demand, which can be used not only in medicine and other organic synthesis intermediates but also in biochemical research. In this paper, the electrochemical reduction mechanism of p-nitrobenzyl bromide (PNBB) in N 2 and CO 2 atmosphere was investigated by cyclic voltammetry (CV), in-situ FT-IR spectroelectrochemistry, and bulk electrolysis experiments. Under N 2 conditions, the electrochemical behavior of PNBB in aprotic acetonitrile solvent is a 1-electron irreversible transfer process. However, in the presence of CO 2 , it is a completely irreversible 2-electron transfer process. The electrolytic products were analyzed by 1 H NMR, 13 C NMR and MS. The results showed that the electrolytic products were 1,2-bis(4-nitrophenyl) ethane and p-nitrophenylacetic acid under N 2 and CO 2 conditions, respectively. The successful preparation of p-nitrophenylacetic acid provides more possibilities for the “green” synthesis of helpful chemical products from organic halides.
研究领域:
有机化学
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电化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2021
·
IF 2.369
Yang Zhou,Changchun Liu,Zhihao Shen,Bencai Dai,Jin Chen
A simple synthetic method of triarylphosphine compounds by KOH-promoted P-Arylation reaction of aryl halides with diphenylphosphine is presented. Notably, this transformation could smoothly proceed with high yields under transition-metal-free and mild reaction conditions. In addition, this protocol is valuable for industrial application due to the convenient operation and readily accessible aromatic halides. A possible explanation of the reaction mechanism was proposed based on the experimental data.
研究领域:
有机化学
·
合成化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Ningbo Geng,Shijiao Hou,Shuai Sun,Rong Cao,Haijun Zhang,Xianbo Lu,Shusheng Zhang,Jiping Chen,Yanhao Zhang
N-(1,3-Dimethylbutyl)-N′-phenyl-p-phenylenediamine-quinone (6PPD-Q) has been identified as the cause of the “urban runoff mortality syndrome.” Thus, the ecological risks of substituted p-phenylenediamines (PPDs) and their quinone derivatives (PPD-Qs) in water have gained global attention. However, large-scale observation of their pollution characteristics in surface water is still lacking. Herein, a nationwide investigation revealed the pervasive occurrence of PPDs and PPD-Qs in riverine waters across China, with the mean concentration of ∑5PPD-Qs being 4.9 times higher than their parent ∑5PPDs. Notably, the 6PPD-Q concentrations at eight sampling sites exceeded the median lethal concentration for coho salmon. National annual riverine fluxes were estimated at 113.1 and 276.2 tonnes/year for PPDs and PPD-Qs, respectively, with the Yangtze River contributing more than one-third of the total fluxes. The transformation of PPDs to PPD-Qs was dependent on atmospheric hydroxylation rates and the half-lives of PPDs. A combined multimedia exposure assessment revealed that water exposure accounted for 82.5% of human exposure to PPDs and PPD-Qs, surpassing the contributions from dust and air exposure. This study provides a comprehensive spatial picture of PPDs and PPD-Qs in China. The national atlas highlights their potential ecological risks and implies that targeted actions should be taken to mitigate potential exposure to PPDs and PPD-Qs.
研究领域:
环境科学
·
毒理学
·
生态学
✓ 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）