CARBON
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2016
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IF 6.198
Juhong Zhan,Huijiao Wang,Xuejun Pan,Jinlin Wang,Gang Yu,Shubo Deng,Jun Huang,Bin Wang,Yujue Wang
This study investigated the regeneration of p -nitrophenol (PNP) saturated activated carbon fiber (ACF) by a novel electro-peroxone (E-peroxone) approach, which aimed to simultaneously regenerate exhausted ACF and mineralize desorbed pollutants by coupling conventional cathodic regeneration with ozonation . PNP-saturated ACF was attached to a carbon-polytetrafluorethylene cathode, which was then applied a current to drive cathodic desorption of pre-loaded PNP and electrochemical generation of H 2 O 2 from O 2 in the sparged ozone generator effluent (O 2 and O 3 gas mixture). The electro-generated H 2 O 2 then reacts with sparged O 3 to yield OH, which can rapidly mineralize the desorbed pollutants (PNP and its derivatives). After 3 h regeneration, the E-peroxone process restored ∼95% of the ACF adsorption capacity , and effectively mineralized the desorbed pollutants. In addition, the E-peroxone regeneration did not considerably modify the structural and chemical properties of ACF. Consequently, the ACF exhibited no evident decline in the adsorption capacity after twelve cycles of PNP adsorption and E-peroxone regeneration. These results indicate that the E-peroxone regeneration can successfully achieve the goal of simultaneous regeneration of saturated ACFs and mineralization of desorbed pollutants, and may thus provide an attractive and viable alternative for the regeneration of organic-saturated ACs.
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高影响因子
Science China-Chemistry
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2016
·Vol. 59
·期 4
·459-465
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IF 2.429
Yuan Ye,Deng Sufen,Song Shaokun,Hu Weibo,Dong Lijie
In this paper, we reported a technique for the surface modification of poly-( p -phenylene terephthamide) (PPTA) powder coated with polydopamine (PDOPA). We used air oxidation to self-polymerize dopamine (DOPA) to ensure that the PPTA powder was coated. Our results indicate that the modified surface of PPTA powder enhances compatibility with the polymer matrix without damaging its structure. Additionally, it is possible to control the coating thickness of PDOPA by regulating the reaction time. The modified PPTA powder improved the comprehensive property of ethylene-propylene-diene-terpolymer grafted maleic anhydride (EPDM- g -MAH), and it proved that this method can enhance the strength and electric insulativity of EPDM- g -MAH.
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RSC Advances
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2016
·Vol. 6
·期 33
·27542-27556
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IF 3.289
Chenfeng Xu,Yu Ding,Jiang Ni,Lifang Yin,Jianping Zhou,Jing Yao
Docetaxel (DTX) has profound effects on several hepatic cancer (HC) cells, but shows unsatisfactory clinical efficacy due to the lack of tumor specificity and p-gp mediated drug efflux. Herein, a novel targeted drug delivery nanosystem based on hyaluronic acid (HA) and quercetin (QU) was designed to improve the in vivo therapeutic efficacy of DTX on HC through HA-CD44 mediated targeting and QU-based p-gp efflux inhibition. DTX-loaded HA–QU polymeric micelles (DTX/HA–QU PMs) displayed a mean particle size of 176.8 ± 3.4 nm with a low polydispersity index (<0.2). The drug loading and entrapment efficiency were 23.6 ± 1.3% and 86.8 ± 1.8%, respectively. Not only did the nanosystem facilitate cellular uptake via HA-CD44 mediated endocytosis, but it also preferentially accumulated at the tumor site via the EPR effect. Moreover, DTX/HA–QU PMs showed prolonged circulation time and high stability in the bloodstream, and achieved AUC0–∞ and t1/2 values that were 3.0-fold and 5.51-fold higher than those of Taxotere®, respectively. In addition, an in vitro cytotoxicity study showed that DTX/HA–QU PMs were 13.6-fold more effective than Taxotere®, judging by the IC50. Importantly, DTX/HA–QU PMs presented the highest antitumor efficacy in a xenograft tumor-bearing mice model and the tumor inhibition ratio was 73.91%. Meanwhile, DTX/HA–QU PMs could down-regulate p-gp expression in tumor cells. These results suggested that the targeting moiety and p-gp efflux inhibitory property help DTX to accumulate at the tumor site and improve its antitumor efficacy in vivo.
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高影响因子
ELECTROCHIMICA ACTA
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2017
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IF 4.798
Hongmei Chen,Xiaoqin Sun,Xiaoxiang Xu
Here we report two Ruddlesden-Popper type ferrite perovskites (SrO)(LaFeO 3 ) n (n = 1 and 2) which demonstrate p-type semiconductivity. Their crystal structure, optical absorption and other physicochemical properties have been systematically explored. Our results show that both ferrites crystallize in tetragonal symmetry with structural lamination along c axis. Efficient photocatalytic hydrogen production has been achieved for both samples under full range and visible light illumination. Better performance is noticed for LaSrFeO 4 with apparent quantum efficiency approaches 0.31% and 0.19% under full range and visible light illumination, respectively. The p-type semiconductivity is verified by their cathodic photocurrent as well as negative Mott-Schottky slop during Photoelectrochemical measurement. The relative lower activity for La 2 SrFe 2 O 7 compared to LaSrFeO 4 is likely due to its higher defect concentration which facilitates charge recombination. Both compounds exhibit anisotropic phenomenon for charge migrations according to theoretical calculations. Their p-type semiconductivity, strong visible light absorption, chemical inertness and high abundance of constituent elements signify promising applications in the field of solar energy conversion and optoelectronics.
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CHEMICAL ENGINEERING JOURNAL
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2016
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IF 5.31
Xiaoxiang Cheng,Heng Liang,Fangshu Qu,An Ding,Haiqing Chang,Bin Liu,Xiaobin Tang,Daoji Wu,Guibai Li
Mn oxide incorporated membranes were fabricated by incorporation of MnO 2 particles prepared using different methods (C-MnO 2 , M-MnO 2 and S-MnO 2 ) on the surface of ceramic ultrafiltration membranes. Initially, the physicochemical properties of prepared MnO 2 particles were systematically analyzed, and S-MnO 2 exhibited the best dispersibility and smallest particle size. Scanning electron microscopy and atomic force microscopy analyses demonstrated that the morphologies and topographies of the fabricated membranes were significantly affected by the preparation method of MnO 2 particles. Subsequently, sodium alginate was employed to investigate the antifouling properties of the fabricated membranes. Although the incorporation of MnO 2 particles increased membrane intrinsic resistance to varying degrees, M-MnO 2 and S-MnO 2 apparently mitigated both reversible and irreversible fouling in the presence of ozone, whereas C-MnO 2 exerted a minor influence. Further, p -chloronitrobenzene was used to study the activity of fabricated membranes in catalytic ozonation. C-MnO 2 , M-MnO 2 and S-MnO 2 incorporated membranes exhibited enhanced activities with the removal efficiencies of 51.7%, 61.5% and 68.0%, respectively. The results indicated that the preparation method of S-MnO 2 was most appropriate for the preparation of highly dispersive MnO 2 particles to incorporate with ceramic membranes. Results in this study contribute to the fabrication of Mn oxide incorporated membranes with an efficient and convenient way, and provide relevant information on their actual application.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2017
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IF 2.714
Jin Feng,Dongliang Fan,Qiang Wang,Lirong Ma,Wei Wei,Jimin Xie,Jianjun Zhu
The paper addresses the effect of support on the structure and catalytic activity of Ag catalysts supported on SiO 2 , Fe 2 O 3 and Al 2 O 3 xerogel for catalytic reduction of p -nitrophenol. In order to study support effect of Ag catalysts, Ag-based xerogel catalysts (2 wt.%, 5 wt.%) were prepared by a facile two-step approach involving sol-gel method followed by calcination, and several techniques were employed to study the influence of different supports on the catalytic structure and reaction performances. The results showed the selected support is the main factor to determine the porous characteristic, porosities and the catalytic properties of the corresponding catalyst. Moreover, Ag-based xerogel catalysts on different supports were used for the conversion of p -nitrophenol (PNP) to p -aminophenol (PAP). The presence of different oxides as supports played a crucial role in the activity of Ag nanoparticles as reduction catalysts. The results revealed that 5 wt.% Ag based catalysts exhibited better catalytic activity for the reduction of PNP to PAP with sodium borohydride at room temperature. The reduction reaction followed the pseudo first-order kinetics. The order of rate constants of the 5 wt.% catalysts was Ag-Al 2 O 3 < Ag-SiO 2 < Ag-Fe 2 O 3 . It was found that these types of Ag-based xerogel catalysts can be used repetitively up to five times with no significant activity loss in the initial reduction rate.
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CHEMICAL ENGINEERING JOURNAL
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2017
·
IF 6.216
Tianyi Sun,Zhiwei Zhao,Zhijie Liang,Jie Liu,Wenxin Shi,Fuyi Cui
A bifunctional CuO-Fe 3 O 4 material was synthesized and employed for the photocatalytic degradation of p-arsanilic acid (p-ASA) under visible light irradiation and simultaneous removal of the released inorganic arsenic by adsorption from solution. The effects of major factors, including solution pH, bicarbonate ion, halide ion and humic acid , on the p-ASA degradation were investigated. Under various water quality conditions, an excellent removal of p-ASA could always be achieved by the CuO-Fe 3 O 4 photocatalytic process and p-ASA could be completely converted to As(V) within 36 min. Simultaneously, the released As(V) could be adsorbed onto the surface of CuO-Fe 3 O 4 nanoparticles with high efficiency above 95% at initial pH range from 4 to 7. The presence of humic acid significantly weakened the degradation of p-ASA by scavenging OH, and slightly inhibited the As(V) removal. On the basis of the UV–vis, FTIR, XPS analysis and the major degradation products detected, the mechanism of the p-ASA photocatalytic degradation and the released As(V) adsorption by CuO-Fe 3 O 4 nanoparticles was given, and the degradation pathway of p-ASA during the photocatalytic process was also taken into consideration. Combined with the photocatalytic property and the high adsorption capacity of As(V), the synthesized magnetic CuO-Fe 3 O 4 nanoparticles have significant potential applications for controlling the risk of p-ASA in wastewater.
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高影响因子
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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DYES AND PIGMENTS
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2016
·
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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DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Xiaochen Yu,Xiao He,Xu Zhang,Yadi Peng,Pengfei Zhao,Ziqiao Zhang,Yifan Liu,Lingcheng Zhang,Peng Zhao
Element doping strategies are commonly employed to achieve effective photocatalysts. In this work, a novel form of P and Ce co-doped g-C 3 N 4 nanosheets was synthesized using a one-step thermal polymerization technique, exhibiting remarkable efficiency in the degradation of organic pollutants under visible light. The prepared catalysts underwent comprehensive characterization through XRD, FT-IR, SEM, TEM, BET, XPS, UV–vis, PL, and electrochemical testing. The electronic and optical properties of the catalysts were further elucidated using first-principles density functional theory (DFT). In the photocatalytic experiment of degrading Rhodamine B (RhB), the photocatalytic ability of g-C 3 N 4 nanosheets was improved at different degrees, among which g-C 3 N 4 nanosheets co-doped with P and Ce showed the highest photocatalytic activity, with a degradation efficiency of 90.58 % for RhB. Furthermore, the photocatalytic mechanism was confirmed through free radical capture experiments. This study presents a novel approach for the development of efficient photocatalysts to remove pollutants.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Jiayin Gao,Yaoyao Wang,Yuqing Yu,Mengxiang Zhu,Wen Kong,Genyan Liu,Xiaogang Luo
Catalytic reduction of p -nitrophenol is usually carried out using transition metal nanoparticles such as gold, palladium , silver , and copper, especially palladium nanoparticles (Pd NPs), which are characterized by fast reaction rate, high turnover frequency , good selectivity, and high yield. However, the aggregation and precipitation of the metals lead to the decomposition of the catalyst, which results in a significant reduction of the catalytic activity. Therefore, the preparation of homogeneous stabilized palladium nanoparticles catalysts has been widely studied. Stabilized palladium nanoparticles mainly use synthetic polymers . Cellulose microspheres , as a natural polymer material with low-cost and porous fiber network structure, are excellent carriers for stabilizing metal nanoparticles . Cellulose microspheres impregnated with palladium metal nanoparticles were carbonized to have a larger specific surface area and highly dispersed palladium nanoparticles, which exhibited excellent catalytic activity in the catalytic reduction of p -nitrophenol. In this work, the cellulose carbon-based microspheres palladium (Pd@CCM) catalysts were designed and characterized by SEM, TEM , EDS, XRD, FTIR, XPS , TGA , BET, and so on. Furthermore, the catalytic performance of Pd@CCM catalysts was investigated via p -nitrophenol reduction, which showed high catalytic activity. This catalyst also exhibited excellent catalytic performance in the Suzuki-Miyaura coupling reaction. Linking aromatic monomer and benzene through Suzuki-Miyaura coupling was presented as an effective route to obtaining biaryls , and the synthesis method is low-cost and simple. In addition, Pd@CCM showed desirable recyclability while maintaining its catalytic activity even after five recycles. This work is highly suggestive of the design and application of the heterogeneous catalyst .
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PubMed
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Fangfang Huang,Xinyin Zhang,Yuhong Chang,Wenwen Chen,Haishun Wu,Lei Li,Jianfeng Jia
Semiconductor photocatalytic organic reactions have garnered extensive interest owing to their environmentally friendly and sustainable advantages. Herein, the preparation of Ag 2 S@CdS p-n heterojunction through in-situ ion exchange reaction for photocatalytic benzylamine coupling is reported. Compared with pure CdS, Ag 2 S@CdS exhibited significantly enhanced photocatalytic activity for the oxidative coupling reaction of benzylamine. In particular, Ag 2 S@CdS showed high photocatalytic benzylamine conversion (>99 %) after 90 min under sunlight irradiation. The photocatalytic performance test at different wavelengths shows that the broadening of the light absorption range of Ag 2 S@CdS effectively improves the utilization of visible light. The photoelectric performance test demonstrates that the internal electric field of the p-n heterojunction effectively enhances the efficiency of separating photogenerated carriers. Moreover, Ag 2 S@CdS exhibited excellent compatibility with various benzylamine derivatives. The mechanism of photocatalytic benzylamine oxidation by Ag 2 S@CdS was investigated. This work provides some insights into the design of visible-light photocatalysts for selective organic synthesis.
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