JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Jinyu Bao,Xintao Jiang,Lingzhi Huang,Wei Quan,Chenxu Zhang,Yanan Wang,Haibo Wang,Yi Zeng,Weijin Zhang,Yongxiang Ma,Shansheng Yu,Xiaoying Hu,Hongwei Tian
Interfacial design and the co-catalyst effect are considered to be effective to achieve separation and transport of photogenerated carriers in composite photocatalysts . In this study, a Z-scheme heterojunction was successfully combined with a co-catalyst to achieve a highly efficient LaNiO 3 /g-C 3 N 4 /MoS 2 photocatalyst. MoS 2 flakes were loaded on a hybrid material surface, which was formed by LaNiO 3 nanocubes embedded on layered g-C 3 N 4 , and a good heterostructure with multiple attachment sites was obtained. Experimental studies confirmed that the Z-scheme heterojunction completely preserves the strong redox ability of the photogenerated electrons and holes. As a cocatalyst, MoS 2 further promoted interfacial charge separation and transport. The synergistic effect of the Z-scheme heterojunction and co-catalyst effectively realized the transfer of photogenerated carriers from “slow transfer” to “high transfer” and promoted water decomposition and pollutant degradation. Results revealed that under simulated sunlight irradiation, LaNiO 3 /g-C 3 N 4 /MoS 2 composites exhibit superior hydrogen evolution of 45.1 μmol h −1 , which is 19.1 times that of g-C 3 N 4 and 4.9 times that of LaNiO 3 /g-C 3 N 4 , respectively. Moreover, the LaNiO 3 /g-C 3 N 4 /MoS 2 Z-scheme photocatalyst exhibited excellent photocatalytic performance for antibiotic degradation and heavy-metal ion reduction under visible light . This study might provide some insights into the development of photocatalysts for solar energy conversion and environmental remediation.
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Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Wenxia Wang,Zhen Li,Han Wang,Hangyu Luo,Zhenbang Meng,Xiaofeng Liu,Lingyu Liu,Weirui Chen,Baosheng Jin,Kai Huang,Ri Chen,Qi He
Dual Z-scheme heterojunction with highly separation efficiency of photoinduced carriers and outstanding redox capability has received considerable attention and hold great promise for environmental remediation. Herein, magnetic dual Z-scheme g-C 3 N 4 /ZnFe 2 O 4 /Ag 2 CO 3 heterojunction was successfully constructed, and applied as a dual-function photocatalyst for tetracycline (TC) degradation and bacterial inactivation. The optimized g-C 3 N 4 /ZnFe 2 O 4 /Ag 2 CO 3 heterojunction exhibited excellent photocatalytic capacity for TC degradation with a rate constant of 0.0154 min −1 , which is 2.73, 3.08, and 2.92 times higher compared to that of the g-C 3 N 4 , ZnFe 2 O 4 , and g-C 3 N 4 /ZnFe 2 O 4 , respectively. Impressively, the g-C 3 N 4 /ZnFe 2 O 4 /Ag 2 CO 3 -1.25 heterojunction displayed satisfying activity within a wider range of pH (3.0–9.0), TC concentration (5–25 mg L −1 ), and with the addition of various anions including Cl - , HCO 3 - , SO 4 2- , and NO 3 - . Meanwhile, 6.5-log of Escherichia coli cells could also be inactivated by g-C 3 N 4 /ZnFe 2 O 4 /Ag 2 CO 3 -1.25 heterojunction under visible light. Mechanism exploration based on trapping experiment, electron paramagnetic resonance (EPR) analysis, and liquid chromatography-mass spectrometer (LC-MS) indicated that the improved photocatalytic performance resulted from the synergetic effect of semiconductors and constructed dual Z-scheme heterojunction, which significantly promotes charge separation rate and endows strong redox capacity. As expected, the toxicity of TC degradation intermediates was reduced according to the Toxicity estimation analysis based on a quantitative structure activity relationships (QSAR) method. Further, the g-C 3 N 4 /ZnFe 2 O 4 /Ag 2 CO 3 heterojunction also demonstrated magnetic separation property and satisfactory photocatalytic stability even after 4 cycles. This work offers a new perspective on constructing novel magnetic dual Z-scheme heterojunction with dual-function photocatalytic properties and is of significance for water remediation.
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CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Zhengkun Yu,Yunlei Zhou,Haowei Zhang,Miao Zhang,Rongyu Zhang,Huanshun Yin,Jun Wang
Bi 2 SiO 5 /CuBi 2 O 4 Z-Scheme heterojunction enriched with oxygen vacancies were prepared by a simple one-pot hydrothermal method. The photocatalytic activity of Bi 2 SiO 5 /CuBi 2 O 4 nanocomposites was evaluated under visible light irradiation using tetracycline, antibiotic-resistant Escherichia coli (AR E. coli ), and tetracycline-resistant genes as the target pollutants. The results showed that Bi 2 SiO 5 /CuBi 2 O 4 nanocomposites had the best photocatalytic activity, which could degrade 83.3 % of tetracycline within 2 h, completely inactivate AR E. coli within 2.5 h, and almost completely destroy tetracycline-resistant genes within 3 h. In addition, the scavenging experiments and ESR experiments not only showed that the active substances of O 2 - , h + and OH played a dominant role and 1 O 2 played a secondary role in the photocatalytic system of Bi 2 SiO 5 /CuBi 2 O 4 nanocomposites, but also confirmed that the Z-Scheme heterojunction was successfully constructed between Bi 2 SiO 5 and CuBi 2 O 4 . Oxygen vacancies were detected by EPR experiments. The formation of oxygen vacancies and Z-Scheme heterojunction enhanced the light absorption properties of the Bi 2 SiO 5 /CuBi 2 O 4 nanocomposites and improved the separation efficiency of the photogenerated electron-hole pairs compared to the single Bi 2 SiO 5 and CuBi 2 O 4 materials. This work showed that Bi 2 SiO 5 /CuBi 2 O 4 was a new and efficient photocatalyst for the removal of tetracycline, AR E. coli and tetracycline-resistant genes, which provided a feasible idea for the management of water environment pollution.
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Journal of Water Process Engineering
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2023
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IF 7
Feng Li,Zhen Wu,Xiaolong Tang,Xiangwei Li,Xingqiang Liu,Shuyuan Yu,Longfu Wei,Changlin Yu
Ti-based semiconductors the eco-friendly materials. Here, using n-tetrabutyl titanate and calcium acetate as raw materials, a dual- Z -scheme TiO 2 /CaTi 4 O 9 /CaTiO 3 heterojunction was facilely constructed via the solvothermal combination with calcination route. The obtained samples were intensively characterized by some physicochemical methods such as TG, XRD, FT-IR, SEM , TEM, XPS, UV–Vis DRS, PL , N 2 physisorption-desorption, and electrochemical tests. The optimum TiO 2 /CaTi 4 O 9 /CaTiO 3 photocatalyst fabricated at a solvothermal temperature of 160 °C and calcination temperature of 700 °C shows high efficiency for H 2 production, which was 11, 5, and 1.6 times higher than that of rutile-phase TiO 2 , CaTiO 3 and commercial P25(TiO 2 ), respectively. The Cr(VI) reduction rate over TiO 2 /CaTi 4 O 9 /CaTiO 3 was 3.3, 5.2, and 3.1 times higher than those of rutile-phase TiO 2 , CaTiO 3, and commercial P25, respectively. The superior photocatalytic performance is attributed to the strong redox ability of carriers excited by wide band gap semiconductors and the unique dual- Z -scheme which largely promotes carrier separation.
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Journal of Water Process Engineering
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2023
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IF 7
Chumin Yan,Xiaoli Dong,Yu Wang,Nan Zheng,Hongchao Ma,Xiufang Zhang
Inorganic semiconductors prepared from MOFs as sacrificial precursors are promising photocatalytic materials. In this work, the direct Z -scheme MoS 2 /NH 2 -MIL-68(In)-derived In 2 S 3 (MoS 2 /In 2 S 3 ) heterojunction composites have been synthesized by sulfidation treatment of MoS 2 /NH 2 -MIL-68(In) (MoS 2 /NM68) composites. Morphological and crystal structural results confirmed that MoS 2 was uniformly dispersed in In 2 S 3 . According to the reduction for Cr(VI) experimental results, the photocatalytic performance of MoS 2 /In 2 S 3 heterojunction composite under visible light irradiation is significantly better than that of pristine MoS 2 and In 2 S 3 , respectively. In addition, the photocatalytic activities of the MoS 2 /In 2 S 3 (II) at different pH and high concentrations of Cr(VI) were also investigated. This paper presents a novel approach to the construction of heterojunction photocatalytic materials using MOFs as sacrificial precursors.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Zhenting Yuan,Huoshuai Huang,Najun Li,Dongyun Chen,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
Ti 3 C 2 quantum dots (TQDs) derived from ultrathin few-layered Ti 3 C 2 nanosheets were served as the low-cost solid electron mediator of photogenerated carriers at the semiconductor interfaces, which could greatly reserve the reductive and oxidative reaction sites on the surface of heterojunctions and accelerate the reduction and oxidation reactions. The all-solid-state TQDs-bridge WO 3 /TQDs/In 2 S 3 Z-scheme photocatalysts exhibited extremely promoted photocatalytic reduction of Cr (VI) and photocatalytic oxidation of Bisphenol A (BPA) under visible light irradiation, which are 4 and 3 times higher than that of WO 3 /In 2 S 3 heterojunctions, respectively. The favorable photocatalytic activities of WO 3 /TQDs/In 2 S 3 should attribute to the effective electron transfer and charges separation with introduction of TQDs as the electron mediators in the Z-scheme system. In addition, the stability of WO 3 /TQDs/In 2 S 3 was investigated and the possible mechanisms during photo-reduction of Cr (VI) and photo-oxidation of BPA were proposed. This work provides a new strategy for fabrication of all-solid-state Z-scheme heterojunctions using Ti 3 C 2 quantum dots as the low-cost solid electron mediator for efficient environmental remediation.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2020
·Vol. 95
·期 6
·1756-1772
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IF 2.75
Guanshu Li,Yuejiao Cao,Ludong Yi,Jun Wang,Youtao Song
BACKGROUND The recovery and reuse of sonocatalysts are the pivotal issues in the sonocatalytic degradation of organic pollutants. The use of some natural minerals as the carrier is not only beneficial to recycling of sonocatalysts, but also reduces the treatment costs of organic pollutants. Two kinds of hydroxyapatite (HAP), Ox Bone (OB)-HAP and synthesized (Syn)-HAP combine with the Pt-TiO 2 /(Er 3+ :Y 3 Al 5 O 12 @Ta 2 O 5 ) (P-TET) composite, obtaining two Z-scheme sonocatalysts, P-TET/OB-HAP and P-TET/Syn-HAP, respectively. The sonocatalytic activities of the prepared samples are investigated via degradation of prometryn and disinfection of Escherichia coli . RESULTS A series of characterizations showed that the Z-scheme P-TET/(OB or Syn)-HAP sonocatalysts were prepared successfully. To evaluate their sonocatalytic activities, some influencing factors such as ultrasonic irradiation time, inorganic oxidants, used times and trapping agents on the sonocatalytic degradation prometryn were determined. The best degradation ratio (80.31% based on N computing and 85.07% based on S atom computing) of prometryn could be obtained for 10 mmol L −1 K 2 S 2 O 8 , 1.0 g L −1 P-TET/OB-HAP sonocatalyst and 150 min ultrasonic irradiation. The excellent sonocatalytic disinfection ratio (88.65%) of E. coli could also be obtained under 40 min ultrasound irradiation. Moreover, a possible mechanism on sonocatalytic degradation of prometryn was illustrated. CONCLUSION The treated bovine bone HAP was directly used as a carrier to combine with P-TET to construct a novel Z-scheme P-TET/OB-HAP sonocatalyst. The high degradation ratio of prometryn and disinfection ratio of E. coli showed that P-TET/OB-HAP could be a promising sonocatalyst for the degradation of organic pollutants and the disinfection of bacteria. © 2020 Society of Chemical Industry
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JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Daguang Li,Jiaxing Huang,Ruobai Li,Ping Chen,Danni Chen,Meixuan Cai,Haijin Liu,Yiping Feng,Wenying Lv,Guoguang Liu
As an emerging carbon nanomaterial, carbon dots (CDs) have superior prospects for applications in the area of photocatalysis due to their unique optical and electronic properties. In this study, a novel CDs modified g-C 3 N 4 /SnO 2 photocatalyst (CDs/g-C 3 N 4 / SnO 2 ) was successfully synthesized by the thermal polymerization. Under visible light irradiation, the resulting CDs/g-C 3 N 4 /SnO 2 photocatalyst exhibited excellent photocatalytic activity for the degradation of indomethacin (IDM). It was demonstrated that a 0.5 % loading content of CDs led to the highest IDM degradation rate, which was 5.62 times higher than that of pristine g-C 3 N 4 . This improved photocatalytic activity might have been attributed to the unique up-conversion photoluminescence (PL) properties and efficient charge separation capacities of the CDs. Moreover, the combination of g-C 3 N 4 with SnO 2 improved the separation of photoinduced carriers and augmented the specific surface area. Reactive species (RSs) scavenging experiments and electron spin resonance (ESR) revealed that superoxide radical anions (O 2 ·− ) and photogenerated holes (h + ) played critical roles during the photocatalytic process. The results of the detection of H 2 O 2 and ESR confirmed that CDs/g-C 3 N 4 / SnO 2 was a Z-scheme heterojunction photocatalyst. Further, HRAM LC–MS/MS was employed to identify the byproducts of IDM, and the major IDM degradation pathways of the CDs/g-C 3 N 4 /SnO 2 photocatalyst were proposed. This study provides new ideas for the design of novel CDs modified photocatalysts for environmental remediation.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2021
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IF 5.279
Yinyin Liao,Haibo Tan,Guotai Jian,Xiaochen Zhou,Luqiong Huo,Yongxia Jia,Lanting Zeng,Ziyin Yang
Tea (Camellia sinensis) is the most popular nonalcoholic beverage worldwide. During cultivation, tea plants are susceptible to herbivores and pathogens, which can seriously affect tea yield and quality. A previous report showed that (Z)-3-hexenol is a potentially efficient defensive substance. However, the molecular mechanism mediating (Z)-3-hexenol signaling in tea plants and the resulting effects on plant defenses remain uncharacterized. To clarify the signaling mechanisms in which (Z)-3-hexenol and light are involved, the gene transcription and metabolite levels were assessed, respectively. This study demonstrated that tea plants rapidly and continuously release (Z)-3-hexen-1-ol in response to an insect infestation. (Z)-3-Hexen-1-ol absorbed by adjacent healthy plants would be converted into three insect defensive compounds: (Z)-3-hexenyl-glucoside, (Z)-3-hexenyl-primeveroside, and (Z)-3-hexenyl-vicianoside identified with laboratory-synthesized standards. Moreover, (Z)-3-hexen-1-ol also activates the synthesis of jasmonic acid to enhance the insect resistance of tea plants. Additionally, a continuous light treatment induces the accumulation of (Z)-3-hexenyl-glycosides. Hence, (Z)-3-hexenol serves as a light-regulated signaling molecule that activates the systemic defenses of adjacent plants. Our study reveals the molecular mechanisms by which biotic and abiotic factors synergistically regulate the signaling functions of herbivore-induced plant volatiles in plants, providing valuable information for future comprehensive analyses of the systemic defense mechanisms in plants.
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APPLIED SURFACE SCIENCE
·
2019
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IF 5.155
Hongjie Zhu,Lingxuan Gong,Zhengkui Li
There is a great need to design a new method for fabricating efficient and cheap Z-scheme photocatalysts. For this reason, we synthesized a novel Z-scheme photocatalyst α-Fe 2 O 3 /P3HT with O-Ti-O charge transfer mediator. The effective compounding of each part was confirmed by different characterization methods. The charge transfer mechanism was confirmed to obey the Z-scheme mechanism by measuring the valence band value and by ESR experiments. Moreover, the Z-scheme mechanism in this system was further discussed based on the observed changes in the chemical structure and the theoretical calculation. Based on the characterization of the optical properties, this novel catalyst exhibited better charge transfer and separation abilities under visible light conditions due to its unique architecture. Additionally, this novel Z-scheme photocatalyst showed enhancement in the bisphenol A degradation effect, the degradation reaction was pseudo-first-order kinetics, a removal rate of up to 90% was maintained after four cycles. The BPA degradation pathway was also discussed in this study. This study provides a new approach for the construction of Z-scheme photocatalysts.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Wei Li,Xiao Wang,Min Li,Shu-ao He,Qiong Ma,Xuechuan Wang
Hydrogen is known as an alternative new energy for its advantages of non-pollution and high calorific value, and photocatalysis technology is regarded as one of the most effective means to produce hydrogen in recent years. In this topic, aiming at the poor photoresponse, fast combination of photo-induced carriers and unstable structure of traditional photocatalysts, the three-dimensional porous g-C 3 N 4 /graphene oxide framework was constructed by compounding two-dimensional graphene oxide and two-dimensional g-C 3 N 4 via hard template (SiO 2 nanoparticles) method and selective chemical etching. Then, silver bromide nanoparticles , a superior photosensitizer, were immobilized on the three-dimensional porous framework to construct the three-dimensional porous g-C 3 N 4 /graphene oxide-AgBr photocatalyst with Ag plasmas by solvothermal method. Research showed that this novel photocatalyst based on Z-scheme heterostructure (GO-AgBr), p-n heterostructure (g-C 3 N 4 -AgBr) and Ag plasmas presented high-efficient visible-light driven hydrogen evolution (3.69 mmol/g/h) at the absence of Pt co-catalyst, which is higher than the majority of existing catalysts, and it also possessed strong stability on its activity and structure. Accordingly, the enhanced hydrogen evolution and photostability were attributed to the highly ordered structure and fast interfacial electron conduction of three-dimensional porous framework, superior photosensitivity of AgBr and synergistic effect of Ag plasmas. Therefore, this study provided a potential method for exploitation of hydrogen energy.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2015
·Vol. 17
·期 17
·11577-11585
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IF 4.493
Sugang Meng,Xiaofeng Ning,Tao Zhang,Shi-Fu Chen,Xianliang Fu
The separation mechanisms of photoexcited carriers for composite photocatalysts are a hot point in the photocatalytic field. In this paper, the Ag3PO4/g-C3N4 nanocomposites with different main parts (Ag3PO4 or g-C3N4) were synthesized using a facile in situ precipitation method. The photocatalysts were characterized by X-ray powder diffraction, UV-vis diffuse reflection spectroscopy, transmission electron microscopy and Brunauer–Emmett–Teller methods. The photocatalytic performance was evaluated by the degradation of methylene blue under visible light irradiation. When the main part of the Ag3PO4/g-C3N4 photocatalyst is Ag3PO4, the transfer mechanism of photogenerated electron–hole takes generic band–band transfer, and the photocatalytic activity is decreased. However, when the primary part of the Ag3PO4/g-C3N4 photocatalyst is g-C3N4, the migration of photogenerated electron–hole exhibits a typical Z-scheme mechanism, and the photocatalytic activity is increased greatly. The separation mechanisms of photogenerated carriers were investigated by the electron spin resonance technology, the photoluminescence technique and the determination of reactive species in the photocatalytic reactions. It is hoped that this work could render guided information for design and application of Z-scheme photocatalysts with excellent photocatalytic performance.
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