CHEMICAL ENGINEERING SCIENCE
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2021
·
IF 4.311
Qian Zhou,Najun Li,Dongyun Chen,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
A new strategy was reported for removal of low-concentration BPA in water via piezocatalytic degradation of equivalently V-doped SrTiO 3 nanofibers (V-STO NFs), which can effectively convert mechanical vibration into chemical energy under ultrasound only. The optimal doped 0.5% V-STO NFs exhibited excellent piezocatalytic performance of complete removal of BPA within 24 min, which could be ascribed to the localized surface piezoelectricity of SrTiO 3 itself and increased local asymmetry of the crystal originating from equivalent vanadium substitution. The influence of ultrasonic power, pH, BPA concentration and coexisting inorganic anions on BPA degradation were analyzed. Moreover, a suitable piezocatalytic mechanism was proposed through the free radical capture test and ESR characterization. The results suggested that the •O 2 – and •OH are the main active radicals in BPA oxidation. It provides a feasible approach for removal of phenolic pollutants by a perovskite-based nano-piezoelectric material.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Yiwei Shan,Ying Guo,Yu Wang,Xiran Du,Jun Yu,Hao Luo,Hui Wu,Bruno Boury,He Xiao,Liulian Huang,Lihui Chen
Using oxygen reduction for the photocatalytic production of hydrogen peroxide (H 2 O 2 ) has been considered a green and sustainable route. In the present study, to achieve high efficiency, graphitic carbon nitride (g-C 3 N 4 ) was obtained using thermal polymerization from a bi-component precursor and was then assembled with cellulose nanofibers . It was found that a small quantity of cellulose nanofibers that generates carbon fibers upon pyrolysis greatly improves the photocatalytic activity compared with that of g-C 3 N 4 alone. The well-defined carbon/g-C 3 N 4 heterojunction-type material exhibits as high as 1.10 mmol L -1 h −1 of photo-production of H 2 O 2 under visible light , which is 4.2 times higher than that yielded by pristine g-C 3 N 4 from a single precursor. A comprehensive characterization of the photocatalyst enables us to delineate the effect of the carbon nanofiber with respect to porosity, electron–hole separation, band gap regulation, and especially the electron transfer pathway. Our results demonstrate that nanocellulose-derived carbon, when precisely assembled with other functional material such as a photocatalyst, is a promising promoter of their activity.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Meesam Ali,Muhammad Tariq,Yong Sun,Jingyao Huang,Xiaogang Gu,Sana Ullah,Muhammad Asif Nawaz,Zhengyuan Zhou,Ali Shan,Muhammad Danish,Shuguang Lyu
Carbonaceous materials (CMs) have been applied extensively for enhancing the catalytic performance of environmental catalysts, however, the self-catalytic mechanism of CMs for groundwater remediation is rarely investigated. Herein, we unveiled the catalytic ability of various CMs via Fe(III) reduction through polyvinyl alcohol-coated calcium peroxide nanoparticles (PVA@nCP) for trichloroethylene (TCE) removal. Among selected CMs (graphite (G), biochar (BC) and activated carbon (AC)), BC and AC showed enhancement of TCE removal of 89% and 98% via both adsorption and catalytic degradation. BET and SEM analyses showed a higher adsorption capacity of AC (27.8%) than others. The generation of solution-Fe(II) and surface-Fe(II) revealed the reduction of Fe(III) on CMs-surface. The role of O-containing groups was investigated by the FTIR technique and XPS quantified the 52% and 57% surface-Fe(II) in BC and AC systems, respectively. EPR and quenching tests confirmed that both solution and surface-bound species (HO•, O 2 − • and 1 O 2 ) contributed to TCE degradation. Acidic pH condition encouraged TCE removal and the presence of HCO 3 − negatively affected TCE removal than other inorganic ions. Both schemes (PVA@nCP/Fe(III)/BC and PVA@nCP/Fe(III)/AC) exhibited promising results in the actual groundwater, surfactant-amended solution, and removal of other chlorinated-pollutants, opening a new direction towards green environmental remediation for prolonged benefits.
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高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 151
·期 12
·3532-3542
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IF 3.186
Mei Haotian,Wang Qi,Liu Guanhong,Zhu Xudong,Zhang Meng,Huang Kai,Lin Kuangfei
Nanoscale zero-valent iron (nZVI) supported on polymeric graphitic carbon nitride (CN) composite (nZVI@CN) was synthesized via liquid phase reduction method as peroxymonosulfate (PMS) activator, and had been achieved efficient degradation of paraxylene (PX) in this study. The physicochemical properties of nZVI@CN were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectrometer, Scanning electron microscopy and Brunauer–Emmett–Teller. The results indicated that catalyst prepared with 1:1 of nZVI and CN mass ration showed the best catalytic performance for the PX degradation. The removal efficiency of PX was 90.9% within 30 min treatment with the optimal reaction conditions (1 mM PMS, 0.1 g/L nZVI@CN, 20 mg/L PX and pH 6.86), and the mineralization rate measured by the removal of total organic carbon had reached 82.6%. Radical quenching and Electron paramagnetic resonance detection confirmed that sulfate and hydroxyl radicals generated by PMS activation were responsible for the degradation of PX, and sulfate radicals were the dominant active species. In addition, the possible reaction mechanism was proposed based on the experimental results. The nZVI@CN can not only be suitable for wide pH range (3–9) to effectively remove PX, but also has good stability and reusability. The removal efficiency of PX was higher than 60% in the fifth reuse experiment, which indicated that nZVI@CN was a stable PMS activator for efficiently PX removal in water. Graphic Abstract
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Yuanyuan Wang,Huan Wang,Zhixian Li,Dongjie Yang,Xueqing Qiu,Yechen Liu,Mengzhen Yan,Qiong Li
Lignin has been demonstrated to be green and effective for the modification of ZnO-based materials. In this work, quaternized lignin/zinc oxide nanostructured hybrid composites (QLS/ZnO NCs) were synthesized with good dispersion and uniform particle size via a facile hydrothermal method . Sodium lignosulfonate (LS) was modified by quaternization to endow the positive charges, which effectively captured bacteria due to the electrostatic interactions. Interestingly, QLS/ZnO NCs show a litchi-like morphology consisting of nanorods with diameters of 5–10 nm, which further resulted in damage to the bacterial cell membrane. Owing to the surface charge and rough surface topology for bacterial capture, QLS/ZnO NCs exhibited greatly enhanced antibacterial activity compared with bare ZnO . After being treated with QLS/ZnO NCs for 90 min, the sterilization rates of Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) reached 97.54% and 99.55%, respectively. Due to the reactive oxygen species (ROS) produced by ZnO under light irradiation, the antibacterial activity of QLS/ZnO NCs could be further enhanced. In addition, the minimal inhibition concentrations (MICs) of QLS/ZnO NCs towards E. coli and S. aureus were both 100 μg/mL, and the minimum bactericidal concentrations (MBCs) were 100 μg/mL and 200 μg/mL, respectively. Moreover, with the incorporation of QLS/ZnO NCs into polyurethane films, the composite films showed excellent antibacterial activity, strong tensile strength and enhanced ultraviolet light blocking performance.
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高影响因子
Molecular Catalysis
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2021
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IF 5.062
Chang Bai,Yong Liu,Cong Wang,Xiao-Cong Zhang,Jia-Xuan Wu,Hai-Tao Ren,Xu Han
Although the oxidation processes mediated by persulfate (PS) and peroxymonosulfate (PMS) attract more attention in the degradation of various recalcitrant contaminants, the high concentrations of oxidants required for the low concentrations of contaminants always limit their large-scale applications. In this work, aniline can be effectively oxidized by CuO and PS under pH-neutral and alkaline conditions. The increased observed rate constant ( k obs ) values with increasing pHs indicate that the oxidation of aniline is facilitated by solution OH − . Meanwhile, the low ratios between the removed PS and aniline (1.19 at pH 7.0 and 1.68 at pH 12.0) indicate the high catalytic oxidation efficacy of the CuO-PS system. The insignificant contributions of SO 4 − , OH, 1 O 2 and O 2 − to aniline oxidation in quenching experiments and EPR analysis suggest that PS is likely activated on the surface of CuO via the non-radical pathway. The presence of carbon-centered radicals (CCRs), as well as UV and GC MS analysis, indicates the important intermediates of PhNH 2 + and PhNH radicals during the oxidation process, revealing that separate transfer of an electron from aniline to the activated PS, followed by subsequent abstraction of a H + by OH − to form PhNH are two important steps in the oxidation process. Further coupling of PhNH radicals results in the formation of insoluble polyaniline polymers at pHs 7.0 and 12.0. The high thermal stability and ideal pseudo-capacitive properties of the insoluble products indicate that the polyaniline produced from aniline wastewater can be used for high-temperature-resistant materials or capacitors. This study provides an efficient alternative to turn aniline waste to polyaniline polymers.
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Journal of Materials Chemistry B
·
2021
·Vol. 9
·期 8
·2042-2053
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IF 6.331
Xiaolu Guo,Changchun Wen,Qianxin Xu,Changping Ruan,Xing-Can Shen,Hong Liang
The second near-infrared (NIR-II) window (1000–1350 nm) usually offers further improved light penetration, a higher maximum permissible exposure (MPE), and a lower background signal. Development of NIR-II optical diagnosis and phototherapy technologies is of great significance for precise, efficient tumor therapy. In this work, a new type of Ti-based targeting agent (B-TiO2@SiO2–HA) nanotheranostic system with strong NIR-II absorption was designed and fabricated for the first time. Oxygen vacancies were formed in B-TiO2 and its band gap was narrowed, resulting in nanotheranostic systems with full-spectrum responses to stimulation with light. The experimental results showed that B-TiO2@SiO2–HA not only can enable high NIR-II photothermal conversion and provide excellent reactive oxygen species (ROS) production capacity, but also can enable high-resolution photoacoustic imaging (PAI) under NIR-II laser irradiation. Moreover, HA modification gives the nanotheranostic systems the useful ability to target high-CD44-expression tumor cells and tissues. In vitro and in vivo experiments demonstrated that B-TiO2@SiO2–HA exhibited a targeted photothermal/photodynamic (PTT/PDT) effect that produced tumor-cell ablation and apoptosis under the guidance of real-time NIR-II PA imaging. B-TiO2@SiO2–HA exhibits precise nanotheranostic potential for PAI-guided tumor-targeting phototherapy.
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2021
·
IF 5.876
Zichen Wang,Hongbin Li,Wei Ma,Yinglong Wang,Peizhe Cui,Jianguang Qi,Zhengrun Chen,Zhaoyou Zhu,Fanqing Meng
Peroxymonosulfate (PMS) activation have provided a new direction to eliminate the organic pollutant . Current challenges that must be solved include secondary pollution by the metal ions and limitation in the recyclability of the catalysts. The waste 1D-FeOOH adsorbent with adsorption of metal elements (As, Cr or Mo ions) has been reused as an efficient electro-catalyst for PMS activation and used to metronidazole (MTD) degradation for the first time. The effects of current density, initial reaction pH, stirring rate, PMS dosage and solution temperature on MTD degradation was studied. The used 1D-FeOOH with adsorption of Mo ions showed the highest PMS activation ability and 99.6% MTD could be removed after 30 min degradation. The •OH and Found that SO 4 •− is the main free radical for MTD degradation. DFT calculation and characterization results were demonstrated that the high PMS electro-catalysis activation ability of the 1D-FeOOH@Mo has resulted from the special composition-dependent interactions among FeOOH@Mo and PMS, including stable adsorption properties, easy electron transfer and weak O O bond. The possible PMS electro-catalysis activation mechanism and MTD degradation pathway have been proposed. (ECOSAR) was used to evaluate the toxicity of metronidazole during degradation. The results showed that the toxicity of MTD and its intermediates could be effectively reduced by prolonging the degradation time in 1D-FeOOH@Mo solution. This work provides new insights for waste adsorbent disposal and gives a new perspective for PMS activation to degradation of antibiotics in water.
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Catalysis Science & Technology
·
2021
·Vol. 11
·期 11
·3715-3723
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IF 6.119
Daoqing Liu,Qianwei Li,Jinbao Hou,Huazhang Zhao
The coexistence of aliovalent cations may facilitate the formation of electronic and ionic defects, altering the catalytic properties of manganese oxide. In this paper, a series of mixed-valent manganese oxides (MnOx) were prepared by a hydrothermal route and tested for heterogeneous activation of peroxydisulfate for Orange II degradation in aqueous solution. The morphology, crystal structure and surface chemistry of the MnOx were adjusted by the addition of ethanol in the hydrothermal process. The physicochemical properties were characterized and evidence from X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) indicated that MnOx exhibited a mixed crystal phase structure of Mn2O3, Mn3O4 and MnO2. The catalytic properties of the three samples prepared with 5%, 10%, and 20% volume fractions of ethanol (denoted as MnOx-5, MnOx-10, and MnOx-20) were found to be related to the valent states of Mn, and MnOx-10 exhibited a better performance with a mole ratio of Mn4+/ Mn2+ close to 1.0. The electrochemical characterization demonstrated that MnOx-10 performed a more effective redox process which may determine the catalytic activity of MnOx. Moreover, quenching tests, electron paramagnetic resonance (EPR) and gas chromatography-mass spectrometry (GC-MS) were used to evaluate the possible activation processes of peroxydisulfate (PDS) and the intermediates of Orange II degradation. This catalyst preparation strategy provides a new idea for the preparation of high-efficiency environmental catalysts.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Ping Sun,Hui Liu,Mingbao Feng,Xuesheng Zhang,Yingsen Fang,Zhicai Zhai,Virender K. Sharma
This work demonstrates for the first time the potential application of a novel nonradical oxidation system consisting of N/S co-doped ordered mesoporous carbon (NS-CMK-3) and peroxymonosulfate (PMS). The results showed that the NS-CMK-3 catalyst effectively activated PMS to completely degrade pharmaceutical acetaminophen (ACT). The catalytic performance of NS-CMK-3 was ~20 and 10 times better than that of pristine CMK-3 and single N-doped one (N-CMK-3), respectively. The oxidative system could also remove other pollutants (i.e., sulfathiazole, trans -ferulic acid, orange G, and phenol). A higher content of N (5.3 at.%) and a distribution of graphite-N (28.1%) were determined in NS-CMK-3 than in N-CMK-3. The synergistic effect of N/S co-doping (i.e., graphite-N and thiophene-S) resulted in the enhanced catalytic performance. The activation of PMS by NS-CMK-3 primarily followed two nonradical pathways (i.e., singlet oxygen and catalyst surface-bound reactive PMS complexes), supported by quenching experiments and electron paramagnetic resonance measurements. The p -benzoquinone ( p -BQ) and ACTdimer were main degradation products. The removal of total organic carbon (TOC) was ≈27%, suggesting nonradicals could mineralize ACT. The NS-CMK-3 not only demonstrated superior stability owing to a removal efficiency that was still as high as 98% in the fifth recycle run, but also significantly decreased the potential effects of water constituents (e.g., Cl − , NO 3 − , HCO 3 − , and humic acid) on the removal process. The NS-CMK-3/PMS oxidative system offers a novel strategy to carry out environmental remediation via nonradical processes.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Hongbo Lu,Chunli Wang,Xueming Liu,Jing Zhang,Zhang Lin,Zhengping Hao,Gang Pan
Arsenic sulfide sludge (ASS) is a typical precipitation product of acid smelting wastewater. Previous study reported that when exposed to sunlight, the release and oxidation of As(III) in ASS were markedly accelerated. However, the key factor to trigger the photocatalytic transformation of ASS is still unclear. Herein, we revealed that the coexisting Fe(II)/Fe(III) ions were critical to promote the photo-oxidation of released As(III) under visible light. We further validated that Fe(II)-stimulated photo-oxidation mechanism of As(III) in ASS was pH-dependent. In acid conditions, OH and SO 4 − were promoted by Fe(II)/Fe(III) cycling catalysis with the assistance of the reductive sulfur species from ASS, e.g. S 2− and SO 3 2− , and thus accelerated the oxidation of As(III). While in neutral conditions, the nascent ferric hydroxide colloids enhanced the oxidation rate of As(III) via photo-induced ligand-to-metal-charge transfer (LMCT) mechanism. These findings help in predicting and controlling the fate of real arsenic-containing sludge in sunlit environments.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Linsen Huang,Deyu Bao,Junhua Li,Xiaoqing Jiang,Xiaosong Sun
The residual antibiotics in water has become an environmental problem and is now deeply concerned. Z-scheme g-C 3 N 4 /defective ZnO heterojunction embellished with Au nanoparticles (Au-g-C 3 N 4 -ZnO) was synthesized by three sequential procedures, in-situ the preparation of g-C 3 N 4 , the guided cultivation of ZnO nanorods on g-C 3 N 4 nanosheets and the deposition of Au nanoparticles. The tailored photocatalysts, imbuing with inherent oxygen vacancies and outstanding light absorption capacity, exhibits unprecedented photocatalysis efficiency for tetracycline (TC) degradation. The formed Au-g-C 3 N 4 -ZnO implements broad-spectrum response, intensifying capacity of light harvest and utilization and promoting the separation and transmission efficiency of carriers. Remarkably, the photocatalytic degradation for TC by 2%Au-g-C 3 N 4 -ZnO achieves the best degradation efficiency of 74.7% within 30 min under Xe lamp irradiation. It displays excellent stability and acid or alkaline resistance. Besides, the TC degradation pathways are elucidated in line with intermediate degradation products. Finally, a novel Z-scheme heterojunction photocatalytic mechanism is rationally proposed based on the band structure, surface plasmon resonance effect, oxygen vacancies, charge transfer behaviors and active species generation.
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