WATER RESEARCH
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2023
·
IF 12.8
Tao Yang,Linqian An,Ge Zeng,Maoju Jiang,Juan Li,Changyu Liu,Jianbo Jia,Jun Ma
The widespread occurrence of p -arsanilic acid ( p -ASA) in natural environments poses big threats to the biosphere due to the generation of toxic inorganic arsenic (i.e., As(III) and As(V), especially As(III) with higher toxicity and mobility). Oxidation of p -ASA or As(III) to As(V) followed by precipitation of total arsenic using Fe-based advanced oxidation processes demonstrated to be a promising approach for the treatment of arsenic contamination. This study for the first time investigated the efficiency and inherent mechanism of p -ASA and As(III) oxidation by Fe(II)/peracetic acid (Fe(II)/PAA) and PAA processes. p -ASA was rapidly degraded by the Fe(II)/PAA process within 20 s at neutral to acidic pHs under different conditions, while it was insignificantly degraded by PAA oxidation alone. Lines of evidence suggested that hydroxyl radicals and organic radicals generated from the homolytic O O bond cleavage of PAA contributed to the degradation of p -ASA in the Fe(II)/PAA process. p -ASA was mainly oxidized to As (V), NH 4 + , and p -aminophenol by the Fe(II)/PAA process, wherein the aniline group and its para position were the most vulnerable sites. As(III) of concern was likely generated as an intermediate during p -ASA oxidation and it could be readily oxidized to As(V) by the Fe(II)/PAA process as well as PAA alone. The in-depth investigation demonstrated that PAA alone was effective in the oxidation of As(III) under varied conditions with a stoichiometric molar ratio of 1:1. Efficient removal (> 80%) of total arsenic during p -ASA oxidation by Fe(II)/PAA process or during As(III) oxidation by PAA process with additional Fe(III) in synthetic or real waters were observed, mainly due to the adsorptive interactions of amorphous ferric (oxy)hydroxide precipitates. This study systematically investigates the oxidation of p -ASA and As(III) by the Fe(II)/PAA and PAA processes, which is instructive for the future development of arsenic remediation technology.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Girma Sisay Wolde,Dong-Hau Kuo,Merga Hailemariam Urgesa,Tadele Negash Gemeda
Simultaneous oxidation of benzyl alcohol (BA) and reduction of p-dinitrobenzene (p-DNB) over Gd-doped TiO 2 nanorods decorated with poly(o-phenylenediamine, PoPD) nanowires was reported in this work. The doping of TiO 2 with Gd induced surface defects, i.e., oxygen vacancy (OV) and the Ti 3+ –on-Ti 4+ site, while incorporating PoPD highly enhanced the light absorption capability and electron conductivity of TiO 2 nanorods , as confirmed by UV–vis diffuse reflectance spectroscopy (DRS) and electrochemical measurements, respectively. BA was selectively oxidized by photogenerated h + to form benzaldehyde with a yield of 70.5% in water and 90.6% in acetonitrile solvent. Conversely, p-DNB was selectively reduced to p-nitroaniline (p-NA) with a yield of 89.1% in acetonitrile and to p-phenylenediamine (p-PDA) of 85.0% yield in water. This work demonstrates a vital strategy to utilize the full economic potential of photogenerated charge carriers and the decisive role of solvent for product selectivity in the course of selective organic transformations.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Jun Chen,Boding Zhang,Bingxing Wang,Chengxing Cui,Songlin Wang,Jichao Wang,Wenlong Zhang
With high toxicity, carcinogenicity and teratogenicity, quinoline has been threatening human health and ecological environment. Herein, Fe-Co-Ni-P/g-C 3 N 4 particles are developed as electrochemical reactors to form a three-dimensional catalytic particle electrode system (3D-CPE) for efficient removal of quinoline from wastewater by electro-Fenton (EF) oxidation process. with reaction time of 30 min, the particles dosage of 50 g/L, pH of 3, conductivity of 11.5 ms/cm, and current density of 37.04 mA/cm 2 , the chemical oxygen demand (COD) removal rate can up to 90.95%. In addition, electron paramagnetic response (EPR) and radical scavenging tests are performed to determine the hydroxyl radicals of electrochemical processes produced. The degradation products are analyzed by high performance liquid chromatography-mass spectrometry (HPLC-MS). Finally, through theoretical calculation and analysis of degradation products, a reasonable degradation mechanism is proposed.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Zhengang Wei,Zelin Xie,Yige An,Gang Wu,Duyu Zheng,Juxing zha,Bin Xiao,Jiqiu Qi,Fuxiang Wei,Qingkun Meng,Yanwei Sui,Xiaolan Xue,Danyang Zhao,Yongzhi Li,Qing Yin
CoSb particles have an extremely high specific capacity as anodes for Li-ion batteries, but the severe expansion during the reaction process makes their cycle stability very poor. In this study, a 3D CoSb/P-CNFs@rGO network structure has been successfully constructed by a simple electrospinning technique and hydrothermal treatment . 1D carbon nanofibers and 2D reduced graphene oxide network are intertwined and coated to create this 3D structure. In this ingenious strategy, CoSb particles are embedded in carbon nanofibers to restrain volume expansion. By encapsulating the nanoparticles in a graphene structural network, it is possible to stabilize the matrix structure and precipitate CoSb particles for secondary capture. In addition, the 3D network structure also builds a fast channel for 3D interaction electron/ion transfer. Benefiting from the above structural advantages, the CoSb/P-CNFs@rGO flexible self-supporting anode exhibits excellent electrochemical performance, including ultra-long cycling performance (870 mA h g −1 after 2000 cycles at a current density of 500 mA g −1 ). More importantly, the 3D structure design method may provide a simple and effective strategy to overcome the volume expansion of anode materials .
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Catalysts
·
2022
·Vol. 12
·期 12
·1583
·
IF 4.501
Ximiao Zhu,Fan Yang,Jinhua Liu,Guangying Zhou,Dongdong Chen,Zhang Liu,Jianzhang Fang
A novel phosphorus and oxygen co-doped graphitic carbon nitride (sheetP-O-CNSSA) photocatalyst was successfully synthesized and applied for H2evolution under visible light. In the synthesis process ofsheetP-O-CNSSA, the supramolecular complex was developed by the self-assembly and copolymerization reaction among melamine, cyanuric acid (CA) and trithiocyanuric acid (TCA) to act as g-C3N4precursors, while (NH4)2HPO4was applied as P and O precursors for element doping. The chemical structures, morphologies, and optical properties of thesheetP-O-CNSSAwere characterized by a series of measurements, i.e., XRD, FT-IR, SEM, TEM, UV-vis DRS, and PL. The results suggested that the introduction of P and O elements could enhance the separation and migration efficiency of photogenerated electrons and holes in the energy band of g-C3N4. The photocatalytic tests over Erythrosin B (EB) sensitizedsheetP-O-CNSSAindicated that the hydrogen evolution was greatly enhanced compared with other catalysts and non-sensitizedsheetP-O-CNSSAunder visible light irradiation. Finally, a possible dye-sensitized photocatalysis mechanism was also proposed on the basis of the as-obtained results.Keywords:P-O-co-doped g-C3N4;self-assembly;dye sensitization;hydrogen evolution
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ORGANIC ELECTRONICS
·
2022
·
IF 3.868
Duoling Cao,Zuhong Li,Ya Xu,Wenbo Li,Hang Zhong,Yin Huang,Xu Zhang,Li Wan,Xiuhua Zhang,Yuebin Li,Xiaoming Ren,Xianbao Wang,Dominik Eder,Shimin Wang
Defects at the surface and grain boundaries of three-dimensional (3D) organic-inorganic metal halide perovskite films lead to the non-radiative recombination of charge carriers and accelerate perovskite decomposition. In turn, this deteriorates the power conversion efficiency ( PCE ) and stability of perovskite solar cells (PSCs). Herein, p -methylphenylmethylammonium iodide ( p -MePMAI) was reacted with a 3D perovskite to in - situ form a two-dimensional (2D) perovskite upper layer. This upper layer passivated the surface and grain boundary defects of the 3D perovskite film, improving its surface hydrophobicity . As a result, a carbon counter electrode (CE)-based 2D/3D PSC achieved a maximum PCE of up to 15.63%, which was much higher than that of an unmodified 3D MAPbI 3 PSC (12.16%). Moreover, the unencapsulated 2D/3D device maintained 80% of its initial PCE after exposure to air for 700 h with a relative humidity (RH) of 40 ± 5%. This research opens a new pathway for the successful construction of stable and efficient 2D/3D PSCs with organic ammonium salts .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yaqiao Liu,Shuozhen Hu,Xinsheng Zhang,Shigang Sun
Fe 2 O 3 is a promising n -type semiconductor as the photoanode of photoelectrochemical water-splitting method due to its abundance, low cost, environment-friendly, and high chemical stability. However, the recombination of photogenerated holes and electrons leads to low solar-to-hydrogen efficiency. In this work, to overcome the recombination issue, a p-type semiconductor, CuO, is introduced underneath the γ-Fe 2 O 3 to synthesize γ-Fe 2 O 3 /CuO on the FTO substrate. Along with the formation of p-n heterojunction , CuFe 2 O 4 is in situ generated at the interface of γ-Fe 2 O 3 and CuO. The existence of Cu 2 O in CuO and CuFe 2 O 4 promotes the charge transfer from CuO to γ-Fe 2 O 3 and within CuFe 2 O 4 , respectively, resulting in creating an internal electric field in γ-Fe 2 O 3 /CuO and leading to the conduction band of CuO bending up and γ-Fe 2 O 3 bending down. Additionally, Cu(II) in CuFe 2 O 4 contributes to fast electron capture. Consequently, the charge transfer efficiency and charge separation efficiency of photo-generated holes are promoted. Hence, γ-Fe 2 O 3 /CuO exhibits an enhanced photocurrent density of 13.40 mA cm −2 (1.9 times higher than γ-Fe 2 O 3 ). The photo corrosion resistance of CuO is dramatically increased with the protection of CuFe 2 O 4 , resulting in superior high chemical stability, i.e. 85% of the initial activity remains after a long-term test.
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Materials
·
2023
·Vol. 16
·期 3
·960
·
IF 3.4
Zhangjing Chen,Xueteng Zhu,Jinyan Xiong,Zhipan Wen,Gang Cheng
Photocatalytic CO2reduction is a promising technology for reaching the aim of “carbon peaking and carbon neutrality”, and it is crucial to design efficient photocatalysts with a rational surface and interface tailoring. Considering that amine modification on the surface of the photocatalyst could offer a favorable impact on the adsorption and activation of CO2, in this work, amine-modified brookite TiO2nanorods (NH2-B-TiO2) coupled with CuxS (NH2-B-TiO2-CuxS) were effectively fabricated via a facile refluxing method. The formation of a p–n junction at the interface between the NH2-B-TiO2and the CuxS could facilitate the separation and transfer of photogenerated carriers. Consequently, under light irradiation for 4 h, when the CuxS content is 16%, the maximum performance for conversion of CO2to CH4reaches at a rate of 3.34 μmol g−1h−1in the NH2-B-TiO2-CuxS composite, which is approximately 4 times greater than that of pure NH2-B-TiO2. It is hoped that this work could deliver an approach to construct an amine-enriched p–n junction for efficient CO2photoreduction.
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JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2023
·Vol. 70
·期 10
·1893-1900
·
IF 1.8
Qing Huang,Chen-dong Ling,Wen-feng Zhuge,Zeng-hu Zhang,Gang Xiang,Jin-yun Peng,Xue Liang
Objective Para-aminophenol (PAP) is a critical intermediate widely used in medicine, pharmaceutical, rubber, antioxidant, petroleum, and other fields, but it is harmful to the environment. A novel photo electrochemical (PEC) sensor was synthesized and applied to detect PAP based on the composite material of cadmium telluride nanoparticle (CdTe NPs)–decorated copper–tetramine phthalocyanine covalently grafted graphene oxide (CuTAPc-Gr). Materials & Methods Copper–tetramine phthalocyanine (CuTAPc) has an excellent PEC conversion effect and narrow band. Graphene (Gr) has high mechanical stability and suitable bandgap. CuTAPc-Gr was synthesized by chemical covalent bonding. And CdTe NPs@CuTAPc-Gr composite was prepared by ultrasonic mixing method using CuTAPc-Gr and CdTe NPs. The morphology and structure of the PEC materials were characterized using scanning electron microscopy and fourier transform infrared spectrometer. PAP contents were evaluated by the Time-Current method. And the electron transfer rate of the PEC sensor was studied by electrochemical impedance spectroscopy methods. Results & Discussion CdTe NPs@CuTAPc-Gr has excellent PEC properties. In the PAP analysis, distinct regular changes in the photocurrent within a linear range of 33.3–1330.0 nM were noted. The limit of detection was 15.5 nM. Acetaminophen, phloroglucin, and other substances did not affect PAP content determination. The water samples were analyzed using the proposed PEC sensor. The results show that the recoveries were in the range of 97.85%–99.58%, and relative standard deviations (RSDs) were less than 2%. Conclusions The PEC sensor exhibited excellent sensitivity, selectivity, and stability. The proposed method provides an effective strategy for constructing PEC sensors to detect PAP in water samples and a promising PEC platform for analyzing other small molecules.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 37
·12750-12758
·
IF 6.4
Zhiquan An,Siying Chen,Tao Lu,Pengjun Zhao,Xiaodong Yang,Yang Li,Juan Hou
Passivation of the buried interface benefits the poor crystallization of perovskite films caused by defects, improves the interface contact with the electron transport layer and inhibits severe non-radiative recombination. The 4′-methoxy-2′-nitroacetanilide (ANE) molecule has a variety of active sites, including CO, C–O–C and NOO, and is promising to be used as an interface modifier in perovskite solar cells. Our research confirms that ANE could reduce defects by forming chemical interactions with both SnO2 and the perovskite layer. The quality of the perovskite and SnO2 is enhanced with suppressed non-radiative recombination. Finally, the power conversion efficiency (PCE) of a champion device is improved to 22.63%. The target device retains 92% of its initial PCE (22.27%) after 1200 hour storage in the air. This study provides a key to designing and screening multifunctional passivators to improve the performance of PSCs.
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MACROMOLECULAR MATERIALS AND ENGINEERING
·
2022
·Vol. 308
·期 2
·2200461
·
IF 4.402
Guorong Wang,Zhiyuan Mei,Yu Li,Guotao Chen,Jie Xin,Zhaoyi Sun,Qingxin Wang,Xu Luo
A metal–organic framework (MOF) formed between Zn and p -hydroxybenzoic acid (PHBA) is synthesized using a solvothermal method. These Zn-PHBA nanorods, which are inexpensive and suitable for mass production, are added as a flame-retardant into vinyl resin (430 LV, a material used in marine composites). Data from cone calorimetric test demonstrates that adding the Zn-PHBA nanorods to 430 LV significantly improves flame retardation and smoke suppression. At a high Zn-PHBA content of 10.0 wt%, the limiting oxygen index of 430 LV increases from 19.5% to 28.5%, and the material reaches the V-0 rating in vertical burning tests (UL-94). Moreover, the tensile and impact strengths of 430 LV containing 10 wt% Zn-PHBA as flame-retardant do not deteriorate and are even slightly improved. This work demonstrates that this MOF synthesized by a simple and efficient method may be used to produce nanocomposites with excellent flame retardation and mechanical properties, while keeping the material cost sufficiently low for marine applications.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 9
·097501
·
IF 4.386
Dongmei Ren,Xingwen Wang,Chunpeng Leng,Wei Meng,Jingrui Zhang,Chao Han
4-Nitrophenol (4-NP) is a typical organic pollutant, thus it is urgent to detect it in environmental samples. This study rationally designed a novel electrode material of P-doping Fe/Fe3O4@C (P-Fe/Fe3O4@C) prepared with MIL-88 as precursor. P2h-Fe/Fe3O4@C-700 was synthesized by calcining MIL-88 at 700 °C, followed by annealing process with NaH2PO2 for 2 h. The P2h-Fe/Fe3O4@C-700 modified glassy carbon electrode (P2h-Fe/Fe3O4@C-700/GCE) showed a high electrocatalytic activity toward 4-NP reduction due to its active metal center, fine-tuned electronic structure by P-doping, as well as good electrical conductivity. It exhibited excellent sensing behaviors in 4-NP detection with rather high sensitivities of 1415.43 μA·mM−1·cm−2 and 424.63 μA·mM−1·cm−2 in the 4-NP concentration of 5 to 100 μM and 100 to 1200 μM, respectively, with a low detection limit of 0.462 μM. The P2h-Fe/Fe3O4@C-700/GCE still had good selectivity for 4-NP detection in the presence of common interferences. In addition, it was found that the current response towards 4-NP at P2h-Fe/Fe3O4@C-700/GCE retained more than 97% of its initial value after one week, indicating a good long-term stability. Furthermore, the P2h-Fe/Fe3O4@C-700/GCE exhibited a good reproducibility. The constructed P2h-Fe/Fe3O4@C-700/GCE achieved practical uses for the sensing of 4-NP in tap water with satisfactory recoveries.
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