CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Yujie Zhan,Jian Ji,Haibao Huang,Miao He,Dennis Y.C. Leung,Shuilian Liu,Yajie Shu,Qiuyu Feng,Ruijie Xie,Ruimei Fang,Xinguo Ye
Catalytic oxidation and AOPs normally require catalysts or chemical oxidants during VOCs degradation, making these processes costly and complex. We herein developed a facile system, VUV photolysis in pure water (VUV/H 2 O), for efficient VOCs degradation without auxiliary substances. The performance and mechanism of this system was intensively studied through controlling reaction conditions, detecting intermediates and analyzing reaction process during toluene degradation. Compared with direct VUV photolysis of gaseous toluene (VUV/Gas), the VUV/H 2 O system exhibited higher removal efficiency (83%) and mineralization rate (80%) of gaseous toluene bubbled into the system. In addition, no O 3 and gaseous byproducts were detected in the outlet gas stream. The excellent performance of VUV/H 2 O was attributed to the generation of more ·OH from the VUV photolysis of water and the continuous degradation of accumulated intermediates dissolved in water. The high CO 2 yield under an air atmosphere demonstrated that the dissolved oxygen in the water was essential for toluene mineralization since it was involved in the ring-fragmentation of toluene. According to various radicals and organic intermediates detected, possible pathway of toluene degradation in the VUV/H 2 O system was also proposed, which include OH addition, hydrogen abstraction and isomerization. The water after reaction can be effectively purified by sustaining VUV irradiation. This study presents a facile VUV/H 2 O system without auxiliary substances for efficient VOCs degradation and provides an insight into its degradation mechanism.
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 37
·12675-12682
·
IF 4.029
Taotao Lv,Di Li,Yuanzhi Hong,Bifu Luo,Dongbo Xu,Min Chen,Weidong Shi
The development of Z-scheme heterojunction photocatalytic systems is a promising strategy to produce hydrogen and for pollutant degradation. In this study, the direct Z-scheme CdS/Bi4V2O11 photocatalysts were synthesized via a two-step solvothermal method. The photocatalytic properties of the samples were measured by ciprofloxacin (CIP), tetracycline (TC) and rhodamine B (RhB) degradation under visible light (λ > 420 nm). In addition, a probable reaction mechanism for organic pollutants over CdS/Bi4V2O11 photocatalysts was also proposed based on the analysis of electron spin resonance (ESR) and active species capture experiments. The enhanced photocatalytic activity of CdS/Bi4V2O11 photocatalysts was ascribed to the efficient electron transfer of direct Z-scheme CdS/Bi4V2O11 photocatalysts.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 81
·51512-51520
·
IF 3.108
Minmin Liu,Lin Zhang,Bei-dou Xi,Shuili Yu,Xiaojun Hu,Li-an Hou
The activation of persulfate (PS) by metal catalysts under visible light is expected to offer a promising oxidation reaction for the removal of contaminants from water. Herein, we investigated activated PS systems under visible light irradiation for the generation of reductive species to decompose ciprofloxacin (CIP). Improved PS activation using TiO2/Fe2O3/zeolite ((n)TiFeZ) under visible light irradiation favorably leads the reaction to generate reductive radicals. The enhanced degradation efficiencies of the (n)TiFeZ–PS system for CIP removal was due to the extended absorbance in the visible-light region and improved space separation of photo-induced charge carriers. The (4)TiFeZ catalyst exhibited better performance for CIP removal as compared to the other samples. The CIP was completely degraded in 120 min using 1 g L−1 (4)TiFeZ and 5.0 mM PS at pH 7.0. The characterization and electron paramagnetic resonance (EPR) of (n)TiFeZ suggested that CIP was mainly degraded by surface-adsorbed radicals generated from the reaction between PS and Fe(II) on the samples under visible light. The reductive systems coupled with (n)TiFeZ exhibited high CIP degradation efficiency and high potential for the decomposition of other antibiotic compounds.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xiange Peng,Gengping Wan,Lihong Wu,Min Zeng,Shiwei Lin,Guizhen Wang
The exploitation of multifunctional nanomaterials used for colorimetric biosensing assays is highly desired in diagnostic applications. In this paper, a novel TiO 2 -encapsulated Au ( [email protected] 2 ) yolk-shell nanostructure was synthesized via a simple and controllable method, in which the TiO 2 nanotubes could effectively restrain the aggregation and growth of Au nanoparticles and supply more active sites and high surface areas for biocatalytic reactions. The microstructure and composition of as-prepared nanocomposites were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution TEM (HRTEM), and X-ray photoelectron spectroscopy (XPS). The results demonstrated that unique [email protected] 2 yolk-shell nanostructure with the well-dispersed Au nanoparticles confined in nanotube was obtained. The investigation of peroxidase-like activity of [email protected] 2 nanocomposites confirmed that the relative catalytic kinetic followed Michaelis–Menten behaviors. On the basis of the highly efficient peroxidase-like activity of [email protected] 2 , an effective method for colorimetric detection of H 2 O 2 and glucose was established. Considering numerous advantages including reduced aggregation, good chemical stability and high catalytic activity available by the present [email protected] 2 with unique structure, designing other yolk-shell nanostructures with exact function orientation using a similar strategy may also be very promising in the application of biocatalysis and bioassays.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wenting Li,Jihui Zhou,Yangyang Zhang,Shikai Liu,Rumin Li,Shili Gai,He Ding,Lei Zhong,Piaoping Yang
Photothermal-enhanced chemodynamic therapy (CDT) based on the Fenton reaction has been widely studied as a safe, tumor-specific, and highly effective nanomedicine therapy. Herein, a collective hyperthermia-facilitated glutathione (GSH) inhibition strategy for boosted oxidative stress treatment was presented using mesoporous Prussian blue (MPB NPs) as a multifunctional carrier and loading β-lapachone (Lap) as an oxidative mediator. A phase transfer catalyst (lauric acid, La) was co-packed for preventing drug leakage and achieving temperature-controlled drug release. After biocompatible decoration by external encapsulation with polyethylene glycol (PEG), the MPB-Lap/La@PEG nanocatalysts (Mlalp NCs) were rationally constructed. Upon 808 nm light irradiation, the Mlalp NCs showed a good photothermal effect with temperature increases for directly damaging tumor cells and accelerating the release of Lap. Significantly, the expression of NAD(P)H: quinone oxidoreductase-1 (NQO1) in cells could increase and generate more hydrogen peroxide (H 2 O 2 ) with Lap and reduce the level of GSH concurrently, forming a hyperthermia-facilitated glutathione inhibition strategy. Most importantly, the hyperthermia also accelerated the Fenton reaction rate, resulting in an enhanced CDT effect. In addition, the Mlalp NCs also equipped with excellent T 1 -weighted magnetic resonance imaging properties. To sum up, this work displays a collective hyperthermia-facilitated glutathione inhibition strategy for boosted oxidative stress treatment.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2025
·
IF 3.1
Cheng Yuanyuan,Huang Xiujuan,Tu Yifeng,Ma Qi,Yan Jilin
A simple and effective fluorescent/colorimetric dual detection was established toward acid phosphatase (ACP). Photoluminescent copper nanoclusters with blue emission were synthesized. These nanoclusters were also found with peroxidase-like activity and capable of accelerating the conversion of 3,3',5,5'-tetramethylbenzidine (TMB) into a colored oxidized form (oxTMB). As a strong ligand toward copper, pyrophosphate (PPi) inhibited this catalysis. When ACP was present, it hydrolyzed PPi into non-binding phosphate, and thus the inhibited catalysis was recovered. This brought in an increase in absorbance from oxTMB for a colorimetric signaling. Meanwhile, due to a good overlap of the emission of the CuNCs and absorption of oxTMB, the fluorescence signal was attenuated through inner filter effect (IFE). Both the increase of the absorption and decrease in fluorescence were applied for the quantification of ACP activity. The colorimetric signals provided a linear response toward ACP in the range 0.1–10 U/L, with a detection limit of 0.01 U/L, while the fluorimetry responded within 0.005–10 U/L, with a detection limit of 0.001 U/L. Because the same reagents and steps were applied, the method allowed a facile switching between these two modes, depending the performances required and instrumentations available. The applicability of the detection was validated through analysis of human serum samples. Graphical
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zijun Xu,Ruoxin Ma,Chun Zhang,Jiao Chen,Jingbiao Fan,Qingdong Shi
Cr(VI) pollution in water caused by industrialization poses a serious threat to human health and ecosystems, necessitating a rapid reduction of Cr(VI) treatment method. Therefore, We have established a photocatalytic method for the rapid reduction of Cr(VI) by modifying TiO 2 with carbon dots (CPC-CDs) that possess a quaternary ammonium structure in the first time. The CPC-CDs widens the band gap of TiO 2 and increases the electrostatic interactions between CPC-CDs/TiO 2 and Cr(VI), thus improving the reduction efficiency. CPC-CDs/TiO 2 (0.1 g, 2 % CPC-CDs) exhibited excellent reduction performance and fully reduced Cr(VI) (50 mg/L) under neutral conditions within 150 min using a xenon lamp to simulate sunlight. Moreover, CPC-CDs/TiO 2 achieved more than 95 % reduction efficiency over a wide pH range (pH = 3, 5, 7, and 9) and showed excellent reduction of Cr(VI) at various concentrations (10, 20, 30, 40 and 50 mg/L). CPC-CDs/TiO 2 maintained high Cr(VI) reduction efficiency (93.57 %) after five cycles. Tests under real sunlight revealed that CPC-CDs/TiO 2 thoroughly reduced Cr(VI) (10 mg/L) within 30 min, and exhibited excellent structural stability under conditions with interfering ions. Furthermore, CPC-CDs/TiO 2 exhibited prominent antibacterial activity against Escherichia coli . In addition, free-radical trapping experiments verified that the superoxide radicals (• O 2 - ) was the main active species. This study aims to overcome the limitations of photocatalytic reduction under conditions of high concentration Cr(VI), neutral and alkaline environments, and natural sunlight, thereby providing technical support for the rapid reduction of Cr(VI).
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Quantao Cui,Min Zhang,Meng Chen,Chan Yang,Caixue Song,Jingyu Sun,Suding Yan
Biogas residue biochar (BRBC) was prepared from biogas residue (BR), and the removal activity of biochar-driven peroxydisulfate (PDS) and PDS direct oxidation of sulfadiazine sodium (SD-Na) were comparatively investigated. The optimized degradation efficiency of SD-Na could reach 95.5% in BRBC/PDS system while 46.9% in PDS alone system. The results show that surface-bound radicals, 1 O 2 , and π−π* shake-up were all related to the properties of BRBC/PDS system. While in PDS alone system, mediated electron transfer was confirmed to be responsible for the elimination of SD-Na. The degradation intermediates and pathways of SD-Na in different systems were analyzed by density functional theory (DFT) calculations and ultra-performance liquid chromatography with time-of-flight mass spectrometry (UPLC-TOF-MS). This study provides insight into the oxidative degradation of the electron-rich organic pollutants in the systems of persulfate with and without biochar activation.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Rui Ma,Xiaoxiang Cheng,Xinsheng Luo,Tao Yang,Daoji Wu,Heng Liang
Herein, sodium hypochlorite (NaClO) and peroxomonosulfate (PMS) were systematically compared in enhancing vacuum ultraviolet (VUV) oxidation for alleviating ultrafiltration membrane fouling of effluent organic matter. Results indicated that VUV/NaClO pre-treatment exhibited significantly better performance than VUV/PMS, with the irreversible fouling resistance reduced by 64 %. Simultaneously, 96 % of fluorescent substances were removed by VUV/NaClO, and an apparent decrease in surface deposits was observed, with membrane pores exposed and clearly visible. The calculation results through the extended Derjaguin-Landau-Verwey-Overbeek theory indicated that the enhanced hydrophilicity of pollutants reduced the tendency of pollutants to adhere to the membrane surface, leading to the weakening of membrane fouling degree. In the VUV/PMS process, HO • and SO 4 •– were detected with steady-state concentrations of 8.55 × 10 -14 and 1.53 × 10 -13 M. By contrast, the VUV/NaClO system generated HO • , Cl • , ClO • , and Cl 2 •– with steady-state concentrations of 1.15 × 10 -13 , 8.79 × 10 -14 , 7.30 × 10 -13 and 1.50 × 10 -13 M. In conclusion, VUV/NaClO pre-treatment demonstrated high efficiency and significant potential in improving water quality and decreasing membrane fouling in secondary effluent treatment.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 9
·4184-4190
·
IF 2.7
Jie Ding,Xue-Qin Liu,Lei Wang,Ying-Bo Zhu
Reducing the dissolution of metal nanocatalysts to preserve active catalytic sites for peroxymonosulfate-activated advanced oxidation processes (AOPs) is crucial for advanced wastewater treatment. On this basis, a well-defined hollow cage structure (H-CoS/NC)/nanoreactor was successfully constructed by the in situ assembly etching technique to promote the degradation of organic pollutants. The as-obtained catalysts played a significant role in reducing the dissolution of metal catalysts (0.46–0.65 mg L−1) and phenol (50 mg L−1) degradation achieved 100% within 30 min. The unique hollow structure allowed for higher instantaneous concentrations of organic pollutants in the microenvironment, thus providing the impetus for higher reaction rates. The mutual support and mesoporous adsorption of carbon shells allowed most of the CoS particles to be confined in the carbon framework without releasing them into the bulk solution, which improved the stability and reduced the dissolution of metal catalysts. In addition, the cavities between the hollow structures reduce the mass diffusion resistance making the enriched reactant molecules easier to contact with the active sites, which increases the contact of the reactants with the active sites, and realizes the ultra-fast pollutant degradation. This provides an effective way to reduce the dissolution of cobalt-based catalysts and retain active sites in AOPs, balancing the contradiction between the reactivity and stability of nanocatalysts.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Yuanlu Xu,Xin Dong,Yinan Chen,Na Liu,Xinmin Zhang,Chengwen Song,Xinfei Fan
The application of persulfate-based advanced oxidation processes (AOPs) for the removal of emerging pollutants has garnered increasing interest in the field of water pollution control. However, the synthesis of catalysts that simultaneously exhibit stability and exceptional performance is currently facing enormous challenges. In this study, the in-situ growth of nitrogen-doped carbon nanotubes on stratified Fe@RGO substrate was employed to fabricate a novel three-dimensional (3D) composite material for efficient persulfate activation. The innovative design effectively integrated the superior porosity and high conductivity properties of carbon materials, resulting in a unique synergistic effect that facilitated rapid diffusion of reactants and efficient electron transfer. Meanwhile, the incorporation of nitrogen doping can effectively regulate the binding between metal particles and the substrate, thereby enhancing the stability of active sites. This catalyst not only removed SMX ultra-fast in 10 minutes through PMS activation, but also maintained 93% degradation after 5 cycles. A series of radical testing and trapping experiments revealed that the degradation mechanism is primarily dominated by a non-radical pathway. Additionally, electrochemical experiments confirmed that the Fe@RGO/NCNTs with its 3D interconnected layered structure facilitated direct electron transfer. This work demonstrates the broad application prospects of 3D interconnected iron-nitrogen co-doped carbon materials in organic pollution removal.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Wanqi Tang,Yanyang Liu,Qingliang You,Xiaofang Yang,Guiying Liao,Dongsheng Wang,Ying Yan,Qigao Shang
The cobalt monoatomic catalyst with 3D ordered macropores structure (3DOM Co/NC) was prepared using the crystalline porous material ZIF-67 and SiO 2 as the precursor and template, and used to investigate the effect of its activation with peroxymonosulfate (PMS) on sulfamethoxazole (SMX) removal. The mesoporous structure mostly retained after ZIF-67 carbonisation, and the formation of new homogeneous macropores after the removal of the SiO 2 template, which greatly increases the surface area of the catalyst (429 m 2 g −1 ) and promotes long-range mass transfer. Additionally, Co monoatomic sites were formed in the porous skeleton, providing electrons that were utilised for the activation of PMS. This distinctive structure enables it to almost completely degrade of 20 ppm SMX within 3 min and show excellent catalytic degradation efficiency in a wide pH range (3.0–9.0) and high-salinity simulated wastewater (10–100 mM). In addition, the main ROS in the catalytic degradation process were explored as 1 O 2 and O •2- . Combined with the results of DFT calculations and product analyses, the active sites of SMX were predicted and the degradation pathways and mechanisms were inferred, confirming that the degradation process of SMX poses a low risk of toxicity to the environment. This study reveals that the addition of 3DOM Co/NC was more favourable for the activation of PMS for SMX degradation, which contributes to the development and improvement of advanced oxidation processes for environmental remediation.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）