SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Shiben Liu,Xiaohui Jiang,Geoffrey I.N. Waterhouse,Zhi-Ming Zhang,Liang-min Yu
Z-scheme hetero-structured photocatalysts show outstanding photocatalytic activity in many reactions. In this work, a series of novel Z-scheme photocatalysts were fabricated via the photo-reduction of plasmonic sliver nanoparticles on the surface of NH 2 -MIL-125 (Ti)/NiFe layered double hydroxide (Ti-MOF/NiFeLDH) hybrids. The obtained Ti-MOF/Ag/NiFeLDH composites showed excellent photocatalytic performance under visible light, with the Ag nanoparticles facilitating charge transfer across Ti-MOF/NiFeLDH heterojunctions, thus boosting the photocatalytic activity. At an optimized Ag loading, 95% of Rhodamine B (RhB) degradation was achieved within 50 min and 92% Levofloxacin (LVX) degradation within 70 min. The degradation intermediates of LVX were analyzed by LC-MS and the decomposition pathways were proposed. Further, the Z-scheme Ti-MOF/Ag/NiFeLDH photocatalyst demonstrated outstanding reusability and stability in recycling tests (removal efficiencies of 92% for RhB and 90% for LVX after 5 successive test cycles). Trapping experiments revealed that superoxide radicals (•O 2 − ) and hydroxyl radicals (•OH) were two main reactive species formed under visible light, with valence holes (h + ) playing a minor role. Results allowed the mechanisms for antibiotic (i.e. LVX) and dye degradation over Ti-MOF/Ag/NiFeLDH to be proposed. This study introduces a new strategy, the combination of MOFs, LDHs and plasmonic Ag nanoparticles, for fabrication of high-performance Z-scheme photocatalysts for the removal of water pollutants.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Lifang Pan,Shihai Cao,Rui Liu,Huan Chen,Fang Jiang,Xin Wang
Aldehyde-functionalized α-Fe 2 O 3 /graphitic carbon nitride (α-Fe 2 O 3 -DBD/g-C 3 N 4 ) was successfully synthesized through Schiff-based reaction between aromatic aldehydes in 3,4-dihydroxybenzaldehyde and NH 2 groups in urea. The 3,4-dihydroxybenzaldehyde around α-Fe 2 O 3 were advantageous to in situ growth of graphitic carbon nitride on α-Fe 2 O 3 to form the contact interface by chemical bonds and beneficial to the electron transfer , leading to the formation of Z-scheme photocatalytic system. The α-Fe 2 O 3 -DBD/g-C 3 N 4 photocatalysts exhibited a remarkable improvement in the degradation of bisphenol A (BPA) compared with bulk g-C 3 N 4 . The enhanced photocatalytic activity was attributed to the enhanced charge separation efficiency and higher redox potential . This study presents a simple and efficient method to construct all-solid-state Z-scheme photocatalytic system with the formation of tight contact interface and nonmetal materials (aromatic rings) as electron mediators for the removal of complex pollutants.
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MATERIALS RESEARCH BULLETIN
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2019
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IF 3.355
Xiaofeng Hu,Jisong Hu,Qingqi Peng,Xinguo Ma,Shijie Dong,Huihu Wang
In this work, a special hybrid structure with 2D configuration comprising of g-C 3 N 4 , reduced graphene oxide (RGO), and BiOI (g-C 3 N 4 /BiOI/RGO) was rationally constructed and immobilized on Ni foam with RGO functioned as electron transfer mediator and binder. The immobilized 2D g-C 3 N 4 /BiOI/RGO hybrid structure exhibited the enhanced photocatalytic CO 2 reduction to CO and the methyl orange (MO) degradation efficiency under visible light irradiation. Particularly, the hybrid heterojunction with a mass ratio 6% of BiOI to g-C 3 N 4 displayed the highest CO yield and degradation rate constant for MO, which was 1.6 times and 3 times of g-C 3 N 4 /RGO binary heterojunction immobilized on Ni foam. The enhanced photocatalytic activity was ascribed to the rapid charge separation. More importantly, combined with the theoretical calculations on the work functions of g-C 3 N 4 , rGO and BiOI, the experimental results clarified the charges transfer route of g-C 3 N 4 /BiOI/RGO heterojunction conforming to the Z-scheme mechanism.
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MOLECULES
·
2019
·Vol. 24
·期 20
·3806
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IF 3.06
Qiao Zhang,Yi Zhang,Shi-Kang Zhou,Kan Wang,Min Zhang,Pei-Dong Chen,Wei-Feng Yao,Yu-Ping Tang,Jian-Hua Wu,Li Zhang
The dried roots ofEuphorbia kansuiS.L.Liou ex S.B.Ho have long been used to treat edema in China. However, the severe toxicity caused byEuphorbia kansui(EK) has seriously restricted its clinical application. Although EK was processed with vinegar to reduce its toxicity, the detailed mechanisms of attenuation in toxicity of EK stir-fried with vinegar (VEK) have not been well delineated. Diterpenoids are the main toxic ingredients of EK, and changes in these after processing may be the underlying mechanism of toxicity attenuation of VEK. 3-O-(2′E,4′Z-decadienoyl)-20-O-acetylingenol (3-O-EZ) is one of the diterpenoids derived from EK, and the content of 3-O-EZ was significantly reduced after processing. This study aims to explore the underlying mechanisms of toxicity reduction of VEK based on the change of 3-O-EZ after processing with vinegar. Based on the chemical structure of 3-O-EZ and the method of processing with vinegar, simulation experiments were carried out to confirm the presence of the product both in EK and VEK and to enrich the product. Then, the difference of peak area of 3-O-EZ and its hydrolysate in EK and VEK were detected by ultra-high-performance liquid chromatography (UPLC). Furthermore, the toxicity effect of 3-O-EZ and its hydrolysate, as well as the underlying mechanism, on zebrafish embryos were investigated. The findings showed that the diterpenoids (3-O-EZ) in EK can convert into less toxic ingenol in VEK after processing with vinegar; meanwhile, the content of ingenol in VEK was higher than that of EK. More interestingly, the ingenol exhibited less toxicity (acute toxicity, developmental toxicity and organic toxicity) than that of 3-O-EZ, and 3-O-EZ could increase malondialdehyde (MDA) content and reduce glutathione (GSH) content; cause embryo oxidative damage by inhibition of the succinate dehydrogenase (SDH) and superoxide dismutase (SOD) activity; and induce inflammation and apoptosis by elevation of IL-2 and IL-8 contents and activation of the caspase-3 and caspase-9 activity. Thus, this study contributes to our understanding of the mechanism of attenuation in toxicity of VEK, and provides the possibility of safe and rational use of EK in clinics.Keywords:Euphorbia kansui;diterpenoids;vinegar processing;zebrafish toxicity
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JOURNAL OF HAZARDOUS MATERIALS
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2019
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IF 7.65
Jiaxing Huang,Daguang Li,Ruobai Li,Ping Chen,Qianxin Zhang,Haijin Liu,Wenying Lv,Guoguang Liu,Yiping Feng
Anatase TiO 2 nanoparticles coated with P and O co-doped g-C 3 N 4 were prepared via a single-step procedure. The resulting POCN/anatase TiO 2 demonstrated remarkable performance in the degradation of enrofloxacin (ENFX). The photocatalytic activity of this heterojunction was 28.9 and 3.71 times better than that of the CN and anatase TiO 2 , respectively. The microtopography of the POCN/anatase TiO 2 was revealed in this study. Co-doping with P and O increased the visible light adsorption capacity of the g-C 3 N 4 , whereas the anatase TiO 2 nanoparticles enhanced the adsorption properties of the ENFX and the separation of the photoinduced carriers of the POCN/anatase TiO 2 . The O 2 ·− and h + were the main reactive oxidative species in the photocatalytic degradation of ENFX. The results of the detection of H 2 O 2 and ESR confirmed that POCN/anatase TiO 2 was a type Z-scheme photocatalyst. Finally, the ENFX degradation pathways were estimated through the detection of by-products.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Kané Rabé,Lifen Liu,Noor Ahmed Nahyoon,Yizhen Zhang,Ahmed Mahmoud Idris
A visible-light Z-scheme g-C 3 N 4 /Fe 0 /TiO 2 anodic catalyst was tested with cathodic WO 3 in photocatalytic Fuel Cell (PFC) that efficiently degrades berberine chloride and simultaneously generate electricity at pH 2,5,7 and 13. The Stainless-steel mesh electrodes loaded with prepared catalyst were irradiated by visible-light in single chamber PFC. The highest removal of berberine Chloride, cell voltage, and power density were 91%, 0.8 V, and 16.4 W/m 2 at a current density of 2.02 mA/cm 2 , respectively after 90 min irradiation in 0.05 M Na 2 SO 4 electrolyte, with 10 Ω external resistance. The impacts of pH and initial concentration of BEC on photocatalytic degradation and cell voltage were evaluated. The cell current density is enhanced while the photocatalyst activity increased. The constructed PFC maintained high-performance after 5 uses. Its use in degrading wide spectrum refractory pollutants and generate electricity is expected for the proved catalyst design, paired electrodes and high PFC performance for practical wastewater treatment.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2018
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IF 4.841
Siyi Li,Meng Zhang,Xue Ma,Jing Qiao,Hongbo Zhang,Jun Wang,Youtao Song
In this work, an ortho-symmetric double (OSD) Z-scheme SnO 2 \CdSe/Bi 2 O 3 sonocatalyst is skillfully designed and synthesized via ultrasonic-assisted isoelectric point method and then the sonocatalytic activity is studied under ultrasonic irradiation in the degradation of organic contaminants. The effects of ultrasonic irradiation time, sonocatalyst dosage, initial Rhodamine B concentration, organic dye kind and used times are investigated systemically. The formation of OH and h + are confirmed by using t-BuOH and oxalate, respectively. The Rhodamine B can completely be degraded under given experimental conditions such as 10 mg/L Rhodamine B solution, 1.00 g/L OSD Z-scheme SnO 2 \CdSe/Bi 2 O 3 dosage and 150 min ultrasonic process. The formation of mainly intermediate products is studied by Liquid Chromatography–Mass Spectrometry. Moreover, the sonocatalytic reaction mechanism caused by OSD Z-scheme SnO 2 \CdSe/Bi 2 O 3 is presented.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2013
·Vol. 160
·期 3
·H173
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IF 2.588
Bin Hu,Xiaojing Lv,Jingwei Sun,Mi Ouyang,Zhiyan Fu,Cheng Zhang
In this study, a novel material, Z-2, 3-bis(4-(thiophen-3-yl)-phenyl) –acrylonitrile (Z-TPA), was synthesized and characterized. Optical and electrochromic properties of its homopolymer and copolymer with 3, 4-Ethylenedioxythiophene (EDOT) were investigated in details. UV–vis absorption and fluorescence spectra showed that this material possessed the properties of aggregation-induced emission (AIE) due to the introduction of acrylonitrile, which could show sky-blue emitting at the aggregation state and almost no emitting at the solution state. Both its polymer and copolymer displayed better redox activity. Spectroelectrochemical analysis displayed that the copolymer film exhibited multicolor showing, with a claret red in the fully reduced form and a blue-green color in the fully oxidized. Spectrochronoamperometry data revealed that the copolymer films had fast switching time and high chromatic contrast as compared to the homopolymer P(Z-TPA). What's more, the copolymer film was used to construct a dual type polymer electrochromic device (ECDs) with PEDOT. The performance of ECDs were also investigated.
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Journal of Environmental Chemical Engineering
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2016
·
IF 0
Fang Wang,Yong Tao Zhang,Yanli Xu,Xing Wang,Sunfeng Li,Hanbiao Yang,Xueting Liu,Fengyu Wei
N-K 2 Ti 4 O 9 /g-C 3 N 4 /UiO-66 ternary composites were successfully synthesized by a solvothermal method, and were characterized by powder X-ray diffraction, UV–vis diffuse reflectance spectroscopy, the valence band X-ray photoelectron spectroscopy, field emission transmission electron microscopy , photoluminescence emission spectra and N 2 adsorption-desorption. Photocatalytic activities of N-K 2 Ti 4 O 9 , g-C 3 N 4 , UiO-66, N-K 2 Ti 4 O 9 /g-C 3 N 4 binary composites and the ternary composites were investigated by the degradation of Rhodamine B (RhB) under visible light irradiation. The results show that the ternary composites exhibit higher photocatalytic activity as compared with the binary composites and the pure materials. The synergistically enhanced photocatalytic activity of the ternary composites is due to coupling direct solid-state Z-scheme N-K 2 Ti 4 O 9 /g-C 3 N 4 heterojunction with high adsorption capacity of UiO-66 for RhB.
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CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Ziyang Lu,Zehui Yu,Jinbo Dong,Minshan Song,Yang Liu,Xinlin Liu,Zhongfei Ma,Hang Su,Yongsheng Yan,Pengwei Huo
The Z-scheme imprinted ZnFe 2 O 4 /Ag/PEDOT was synthesized by the microwave polymerization method and surface imprinting technique, which possessed good partial hollow spherical structure, good light response ability, good magnetic separation performance, good photocatalytic stability and reproducibility. More importantly, due to the introduction of Ag/PEDOT into the surface imprinted layer, Z-scheme structure was formed to enhance the photocatalytic activity based on Ag acted as the mediator, meanwhile, owing to the existence of the imprinted cavity in the surface imprinted layer, the selectivity had been significantly improved, in a word, the as-prepared Z-scheme imprinted ZnFe 2 O 4 /Ag/PEDOT achieved the goal for simultaneously improving the photocatalytic activity and selectivity. Z-scheme imprinted ZnFe 2 O 4 /Ag/PEDOT possessed the highest photodegradation rate (71.77%) for degradation of tetracycline under the simulated sunlight irradiation of 120 min, which was approximately 4.74 times to that of ZnFe 2 O 4 , 1.42 times to that of Ag/PEDOT and 1.31 times to that of non-imprinted ZnFe 2 O 4 /Ag/PEDOT, respectively. And the coefficient of selectivity of Z-scheme imprinted ZnFe 2 O 4 /Ag/PEDOT relative to ZnFe 2 O 4 , Ag/PEDOT, non-imprinted ZnFe 2 O 4 /Ag/PEDOT was 1.84, 1.82, 1.79 in the single antibiotic solution and 1.78, 1.75, 1.67 in the binary antibiotic solution, respectively. This work provided a new synthesis strategy for the imprinted photocatalysts and also provided a new idea for the treatment of specific pollutants in the water environment.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
En-Ze Deng,Qijie Mo,Yuying Li,Zongwen Mo,Li Zhang,Jiewei Liu
Although Z-scheme heterojunction composites have been widely studied in photocatalysis, in-depth investigation of oxygen vacancies (Ov) in the Z-scheme photocatalysts is still rare. Herein, an oxygen vacancies modified NU-1000/BiOCl-Ov composite with Z-scheme heterojunction was rationally designed and fabricated. The combination of X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) experiment verified the presence of oxygen vacancies, meanwhile the Z-scheme charge transfer across the heterojunction interface was confirmed in detail by the in situ -XPS, Kelvin probe force microscope (KPFM) studies, ultraviolet photoelectron spectroscopy (UPS), EPR radical capture experiment, as well as density functional theory (DFT) calculation. Importantly, compared to pristine NU-1000 and BiOCl, the optimized NU-1000/BiOCl-Ov composite displayed enhanced photocatalytic performance in the degradation of tetracycline hydrochloride (TCH) under visible light (λ ≥ 400 nm). Theoretical calculations reveal that the oxygen vacancies could induce electron redistribution, facilitating the activation of O 2 and TCH molecules, thereby promoting the photodegradation efficiency. Moreover, mechanism studies suggested that the synergistic effect of oxygen vacancies and Z-scheme heterojunction could facilitate the effective separation of photogenerated carriers. At last, the degradation routes of TCH were proposed and the toxicity of degradation intermediates was assessed. This work underlines the cooperative functions of oxygen vacancies and Z-scheme heterojunction towards improved photocatalytic performance, which offers new perspectives on the design of metal–organic frameworks (MOFs) composites for efficient photocatalysis.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
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IF 9.4
Weigang Cui,Churu Zhang,Shuangjiang Li,Yi Liu,Long Tian,Mengrui Li,Yunfei Zhi,Shaoyun Shan
In this study, copper oxide (CuO) was prepared by the microwave-assisted hydrothermal technique subsequently, CuO was grown in situ onto different rare metal compounds to prepare Z-scheme heterojunctions to improve the degradation efficiency of tetracycline (TC) in water environments. Various characterization proved the successful synthesis of all composite materials, and the formation of tight heterojunction interfaces, among which, the core–shell structure ZnIn 2 S 4 @CuO exhibited excellent photocatalytic degradation capability. Research results indicated that the degradation efficiency of ZnIn 2 S 4 @CuO for TC (50 mg/L) in the water environment reached 95.8 %, and the degradation rate is 2.41 times and 12.93 times that of CuO and ZnIn 2 S 4 alone, respectively, the reason is because of the introduction of ZnIn 2 S 4 , Z-scheme heterojunction structures and internal electric field (IEF) is constructed and formed to extend the visible light response range of photocatalysts to improve electron-hole separation efficiency, and enhance charge transfer. In addition, ZnIn 2 S 4 @CuO-2 exhibited good stability and reproducibility, with no significant loss of activity after five cycles. Finally, the precise locations of free radical attack on TC were investigated by the combined use of high-resolution mass spectrometry (HR-MC) and frontier electron densities (FEDs), and a reasonable degradation pathway was provided. The results of this research provide a new and viable approach to overcome the limitations of conventional photocatalytic materials in terms of limited visible light absorption range and fast carrier recombination rates, which offers promising prospects for a wide range of applications in the field of wastewater purification.
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