MATERIALS RESEARCH BULLETIN
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2016
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IF 2.435
Xiaowei Li,Ruixue Chen,Huidong Sui,Xiaoxian Yuan,Meng Li,Kun Yang,Ling Li,Wenming Zhang,Yucang Zhang
Flower-like NiO nanoparticles was successfully synthetized by homogeneous precipitation. A novelty modified (CH 3 ) 4 N) 2 S/((CH 3 ) 4 N) 2 S n electrolyte was introduced in solar cell successfully and NiS was used as the counter electrode. Moreover, CdSe sensitized p-type NiO was synthesized by chemical bath deposition (CBD) in a precursor solution to ensure the nanosized flower-like NiO films obtain a better uniformity and high penetration. Meanwhile, a series of parallel experiment were designed to investigate the effect of different CdSe deposition layers on the photoelectric characteristic of the cell. The result showed that when the film was eight layers, the maximum efficiency of 1.06% had been achieved, with a significantly open circuit voltage ( V oc ) of 0.755 V, a fill factor (ff) of 0.27% and a short circuit current density ( J sc ) of 5.21 mA cm −2 .
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APPLIED CATALYSIS A-GENERAL
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2013
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IF 3.41
Wei Zhai,Fengqiang Sun,Wei Chen,Zizhao Pan,Lihe Zhang,Shaohua Li,Shuilan Feng,Yiyi Liao,Weishan Li
Octahedral Cu 2 O particles were prepared on an indium-tin oxide glass via electrodeposition and were employed in the catalytic degradation of p -nitrophenol in the presence of H 2 O 2 . Under irradiation of a warm visible-light source, tungsten halogen lamp, Cu 2 O particles not only acted as a photocatalyst, but might also act as a thermal-catalyst to induce the decomposition of H 2 O 2 and produce O 2 at higher temperatures. The photogenerated electrons and holes could react with H 2 O 2 , O 2 , and H 2 O to produce abundant OH radicals, resulting in the effective oxidation of p -nitrophenol. High-performance liquid chromatography measurements of degradation intermediates showed that p -nitrophenol was first decomposed into hydroquinone and benzoquinone and then mineralized. The degradation efficiency was dependent on electrodeposition time, light intensity, H 2 O 2 amount, and solution temperature. This catalyst could be easily recycled and used in the efficient degradation of other phenolic compounds.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2012
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IF 5.625
Weiming Wu,Linrui Wen,Lijuan Shen,Ruowen Liang,Rusheng Yuan,Ling Wu
Photoreduction of 4-nitroaniline to p -phenylenediamine over TiO 2 , ZnO, PbBi 2 Nb 2 O 9 and CdS photocatalysts in the presence of CH 3 OH was investigated under light irradiation ( hv ≥ band gap) upon purging with N 2 . Compared with PbBi 2 Nb 2 O 9 and CdS, TiO 2 and ZnO showed photocatalytic activities for the photoreduction of 4-nitroaniline. Electron spin resonance analysis results revealed that a methanol radical could be detected in the present of TiO 2 and ZnO. Its formation was attributed to the reaction between the hydroxyl radical and CH 3 OH molecule. The species had strong reductive ability, and therefore could reduce 4-nitroaniline to p -phenylenediamine. Other alcohols (C 2 H 5 OH and i -C 3 H 7 OH) were also found to be efficient additives for the photoreduction of 4-nitroaniline. The results of the 2 H-labeled experiments indicated that the p -phenylenediamine formation was formed by the hydrogen transfer reaction between the 4-nitroaniline and H 2 O molecules. A mechanism was proposed to explain the photoreduction of 4-nitroaniline to p -phenylenediamine in the present alcohols.
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TRIBOLOGY INTERNATIONAL
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2015
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IF 1.936
Changqing Miao,Lei Zhang,Ke Zheng,Yuanchen Cui,Shengmao Zhang,Laigui Yu,Pingyu Zhang
Ploy( p -methoxyphenol), denoted as PMOP, was synthesized via an enzymatic polymerization method with p -methoxyphenol as the monomer . The corrosion resistance , tribological properties and thermal stability of as-synthesized PMOP were examined. The antioxidation behavior of as-synthesized PMOP as an antioxidant in ester oils was evaluated by rotary oxygen bomb test and pressurized differential scanning calorimetry . It was found that PMOP exhibits excellent antioxidation ability at 150 °C and 210 °C in various base oils. Besides, PMOP has much better antioxidation ability in synthetic ester oil like di-iso-octyl sebacate than several commonly used commercial hindered phenolic antioxidants.
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THERMOCHIMICA ACTA
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2013
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IF 1.989
Yanfang Liu,Jie Zhang,Chunyan Liao,Junfeng Zheng,Shasha Zhao,Mingtao Run
A copolymer of p -aminobenzonitrile type benzoxazine (BA-pabn) and diglycidyl ether of bisphenol-A (DGEBA) was prepared. With rising DGEBA content, the peak temperature of the differential scanning calorimetry curve for polymerization of BA-pabn/DGEBA blend shifts to higher value, and the roughness of the fracture surface of the BA-pabn/DGEBA copolymer increases. In the glassy state, the storage modulus of the copolymer initially tends to increase with rising DGEBA content over pure polybenzoxazine (PBA-pabn), but decreases when DGEBA content reaches to 50 wt%. The copolymer exhibits a single glass transition temperature lower than that of PBA-pabn. The onset weight loss temperature of the copolymer is higher than that of PBA-pabn, but the char yield at 800 °C is lower.
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MICROCHIMICA ACTA
·
2015
·Vol. 182
·期 7
·1323-1328
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IF 3.741
Ran Gu,Chen Chuanning,Gu Chuan
A glassy carbon electrode was modified with a nanocomposite prepared from poly(p-aminobenzene sulfonic acid), multi-walled carbon nanotubes and chitosan to obtain a differential pulse voltammetric sensor for serotonin that is remarkably stable and displays enhanced current response. Its peak current (at 0.38 V vs. Ag/AgCl) varied linearly with the concentration of serotonin in the 0.1–100 μM range, and the detection limit is 80 nM (at an S/N of 3). The sensor was successfully applied to the determination of serotonin in (spiked) human blood serum.
An electrode modified with MWCNTs, chitosan and poly(p-aminobenzene sulfonate) gives significantly enhanced signals for serotonin and improves its oxidation peak current as shown in plot (d) due to improved direct electron transfer.
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DYES AND PIGMENTS
·
2016
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IF 4.055
Hailong Wang,Lele Zhao,Xueqiang Liu,Jing Xu,Wenlong Hou,Jianmin Wang,Enfang He,Ruijun Zhang,Haiquan Zhang
Among photocatalytic materials, p-n heterojunction-type photocatalysts has good photocatalytic performance under visible light irradiation. Herein, a novel Copper phthalocyanine/perylene diimide derivatives p-n heterojunction photoeatalysts based on the intermolecular hydrogen bond between pyridyl and carboxyl was designed and characterized using FT-IR, UV–vis and photoluminescence spectra, and then compared their photocatalytic performance by degradation for rhodamine B (RhB) under visible light irradiation. The hydrogen bond composites shows significant higher photocatalytic activity comparing with its parent, and the photocatalysis increased with increasing of mole fraction of perylene diimide derivatives. The change of morphology and p-n heterojunction structure are in favor of the high photocatalytic active. Furthermore, the photocatalytic mechanism was investigated by radical scavengers testing, that confirmed hydroxyl radical ( OH) was the main reactive species for the degradation of RhB.
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APPLIED SURFACE SCIENCE
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2015
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IF 2.711
Lei Li,Yujie Feng,Youzhi Liu,Bing Wei,Jiaxin Guo,Weizhou Jiao,Zhaohan Zhang,Qiaoling Zhang
In this study, titanium dioxide (TiO 2 ) nanoparticles were surface-modified with salicylic acid (SA) and arginine (Arg) using an environmentally friendly and convenient method, and the bonding structure, surface properties and degradation efficiency of p-nitrophenol (PNP) were investigated. X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FT-IR), water contact angle (WCA) measurements, ζ-potentiometric analysis, UV/visible diffuse reflectance spectroscopy (UV–vis DRS), and thermogravimetric analysis (TGA) were performed to evaluate the modification effect. The degradation rates were determined by high-performance liquid chromatography (HPLC). The results show that bidentate or bridging bonds are most likely formed between SA/Arg and TiO 2 surface. Surface modification with SA, Arg, or both can improve the lipophilic properties and decrease the zeta potential, and also result in a red shift of the absorption wavelength. TiO 2 nanoparticles modified by Arg or both SA and Arg show a large specific surface area and pore volume. Further, degradation experiments under visible light show that Arg modification is most efficient. This simple and versatile synthetic method to produce TiO 2 nanoparticles surface-modified with various organic capping agents can be used for novel multifunctional photocatalysts as required for various applications in energy saving and environmental protection.
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Environmental Science-Nano
·
2017
·Vol. 4
·期 5
·1037-1044
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IF 6.047
Wen-Jing Wang,Jun-Mei Xia,Xin Hai,Ming-Li Chen,Jian-Hua Wang
The nucleophilic substitution reaction between 4-chloro-7-nitro-2,1,3-benzoxadiazole (NBD-Cl) and –NH2 groups on amino-functionalized carbon dots (CDs) produces a novel carbon dot-based hybrid, CDs@NBD for short. In addition to the characteristic fluorescence emission of carbon dots at λex/λem = 360/443 nm, the CDs@NBD hybrid gives rise to new photoluminescence at λex/λem = 460/544 nm, which is significantly quenched by p-phenylenediamine (PPD) via static quenching. This provides a novel sensing approach for fluorometric detection of PPD with CDs@NBD as a probe. A linear calibration graph is obtained within two concentration ranges of 0.1–1.0 μmol L−1 and 1.0–10.0 μmol L−1, along with a detection limit of 56 nmol L−1 and a RSD of <3% (at 1.0 μmol L−1). The common coexisting species in environmental and biological sample matrices cause no obvious interferences on the detection of PPD. The colour change of the CDs@NBD hybrid solution with the variation in PPD concentration also facilitates visual detection of PPD, which further demonstrates promising applications in environmental and biological sample analysis.
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DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Yudan Wang,Xin Zhang,Xue Li,Yaru Jiang,Tianxin Shen,Jinsong Peng,Chunxia Chen,Dengfeng Yu,Gongyuan Zhao
Rechargeable aqueous zinc‑iodine batteries (ZIBs) with low environmental impact and abundant natural reserves have become promising electrochemical energy storage devices. However, the shuttle effect and low conductivity lead to poor electrochemical performance, hindering their practical applications. Herein, a (NH 4 ) 3 PO 4 -activated ZIF-8-derived porous carbon (NPPC) is proposed for entrapping iodine species in ZIBs. Benefiting from its abundant porous structure and highly conductive framework, the iodine loading and electron transport of NPPC is greatly enhanced. In addition, the in-situ doping multiple heteroatoms (N, P and O) in the carbon framework can also establish chemical anchoring with iodine species and hence mitigate the shuttle effect. As a result, the ZIBs prepared by the NPPC-1.5/I 2 electrode achieves an ultra-high specific capacity of 175 mAhg −1 at 0.1 A g −1 , and a specific capacity of 95 mAh g −1 at a high current density of 10 A g −1 . An extremely stable cycle performance of 97 % capacity retaining after 6000 cycles at 10 A g −1 is also obtained. This study provides a new strategy for realizing aqueous ZIBs with high capacity and long cycling life.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Palanisamy Vasudhevan,Dharman Kalaimurugan,Sivarasan Ganesan,Naveed Akbar,Saurav Dixit,Shengyan Pu
Agricultural residues are one of the most cost-effective and readily accessible carbon resources for producing commercially significant enzymes. Several enzymes have been used in different industries like pharmaceuticals, foods, textiles, and dyes that can be generated by various species of microbes found in waste from agriculture. The current research investigated laccase production by Aspergillus oryzae utilizing agricultural wastes. Physical and chemical properties, including pH, temperature, sucrose, yeast extract, and copper sulfate levels, were optimized. The utilization of the response surface methodology along with the centralized composite design method, which assesses multiple media parameters and utilizes a two-level experimental approach, aids in determining the variable and its significance in increasing production quality. The centralized composite design enhancement showed that the optimal conditions for highest laccase activity (623.16 U/mL) were pH 7.0, temperature 25 °C, corn cobs as substrate, sucrose (2.0 %), yeast extract (1.0 %), and copper sulfate (0.1 mM) level. The laccase enzyme was optimized using various pH, temperature, metal ions, and inhibitors combinations. The extracted laccase enzyme maximum activity was attained at pH 6.0 and 40 °C. The inclusion of divalent ions can enhance laccase activity, while the use of various inhibitors decreases laccase activity. Under various pH circumstances, the Aspergillus oryzae laccase enzyme can successfully degrade p-chlorophenol. The present study describes statistically validated optimal methodologies for enhancing laccase synthesis, leading to a laccase production technique that is simultaneously highly efficient and economically profitable, with possible use of p-chlorophenol degradation.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Jiang-Hao Lu,Ze Li,Di Zhang,Lu-Hang Song,Xiao-Yan Cai,Liang Mao,Zhi-Qiang Liu,Zhi-Jie Wang,Xiu-Quan Gu,Guo-Dong Yuan
The nano/microstructuring of silicon (Si) via chemical methods has garnered significant attention due to its excellent light-trapping capabilities across a wide spectral range. Current research has predominantly focused on the synthesis of pyramidal-shaped microtextures, which enable two reflections on the surface, while largely overlooking the superior light-trapping potential of inverted pyramid silicon (SiIP) microtextures, which theoretically allow for three reflections. Moreover, there has been limited investigation into the application of inverted pyramid black silicon for solar-driven hydrogen evolution. This study reports the synthesis of uniformly arranged inverted pyramid-textured black silicon using the copper-assisted chemical etching (Cu-ACE) method to enhance the efficiency of solar-driven water splitting for hydrogen production. The formation mechanism and the influence of copper-localized surface plasmon resonance (Cu-LSPR) from Cu nanoparticle (NP) byproducts on photoelectrochemical (PEC) activity were systematically analyzed. To reduce sidewall defects and minimize photogenerated carrier recombination, the surface of the SiIP was treated with tetramethylammonium hydroxide (TMAH). A vertical PN junction was developed through ion implantation to reduce the external bias of the SiIP. Additionally, a uniform TiO₂ antireflective layer was deposited via atomic layer deposition (ALD), reducing the average reflectance of the SiIP-T 4 to 5.78 % over the 300–1100 nm wavelength range. MoSₓ and Pt NPs were electrodeposited to improve the fill factor and enhance HER kinetics. With optimized catalyst loading, the n + p-SiIP-T 4 /TiO₂/Pt 80 mC electrode achieved a photocurrent density of 8.0 mA cm −2 at 0 V vs. RHE, an applied bias photon-to-current efficiency (ABPE) of 0.93 % at 0.24 V vs. RHE, and a double-layer capacitance (Cdl) of 91 μF cm −2 . The onset potential (Von) was positively shifted by ∼1.13 V to 0.49 V vs. RHE compared to a SiIP photocathode, and the photocathode operated continuously at 0 V vs. RHE for 27 h in an acidic electrolyte. These results demonstrate that SiIP has significant potential for PEC hydrogen evolution, with further performance optimization achievable through structural and surface engineering.
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