MICROCHIMICA ACTA
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2022
·Vol. 190
·期 1
·1-9
·
IF 6.408
Fan Yunfeng,Liu Zhimin,Wang Jie,Cui Chen,Hu Leqian
A novel electrochemiluminescence (ECL) aptasensor for the determination of lincomycin (LIN) was developed based on CdS QDs/carboxylated g-C 3 N 4 (CdS QDs/C-g-C 3 N 4 ). CdS QDs/C-g-C 3 N 4 served as the substrate of the aptasensor, and then CdS QDs/C-g-C 3 N 4 -modified electrode was incubated with aptamer DNA (Apt-DNA). When the non-specific sites of the electrode surface was blocked by 6-mercaptohexanol, the ferrocene-labeled probe (Fer-DNA) was assembled onto the electrode surface through base complementation with Apt-DNA. In the absence of LIN, the ECL signal was quenched effectively by Fer-DNA and a decreased ECL emission (off state) was acquired. On the contrary, LIN was specifically bond with Apt-DNA, and Fer-DNA was detached from the aptasensor surface because of the deformation of Apt-DNA, resulting in an effectively enhanced ECL signal (on state). The constructed ECL aptasensor exhibited a wide detection range for LIN determination (0.05 ng mL −1 –100 μg mL −1 ) with a low detection limit (0.02 ng mL −1 ). Importantly, the proposed ECL aptasensor showed outstanding accuracy and specificity for LIN determination, and also provided a potential strategy for other antibiotic determinations. Graphical Abstract
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2023
·Vol. 40
·期 5
·1122-1132
·
IF 2.7
Hua Weijie,Kang Yong
A coupling method of water surface plasma (WSP) with β -Bi 2 O 3 /CaFe 2 O 4 composite was applied to promote the elimination of aqueous Orange G (OG). The morphology, structures, crystal form and chemical bonding state of the prepared β -Bi 2 O 3 /CaFe 2 O 4 composite were characterized via SEM, TEM, EDS-mapping, XRD, FT-IR and XPS. The results showed that the addition of composites significantly enhanced the degradation and kinetic constant of OG. The degradation efficiency of the combined system containing 8.0 wt% β -Bi 2 O 3 /CaFe 2 O 4 composite was 28.9% higher compared to the sole WSP for OG degradation. The synergistic factor (2.387) demonstrated that the combined system was able to establish a synergistic effect. The effect including peak voltage, air flow rate, initial conductivity and initial concentration of solution on OG removal was inspected. The active species trapping experiments demonstrated ·OH, h + , ·O
− 2
and high-energy electrons devoted to OG removal in the combined system. O 3 and H 2 O 2 were also involved in the OG removal in the combined system. Three-dimensional fluorescence spectroscopy and liquid chromatography-mass spectrometry were tested to investigate the mechanism of OG degradation. Finally, the combined system in the present study was compared with other competitive technologies for the degradation of OG in the literature.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Yan Wang,Guangshe Li,Chang Liu,Xinbo Li,Liping Li
Metal geometrical structure engineering of composite catalysts is powerful to boost their photocatalytic performance of hydrogen evolution . Herein, by rationally designing, transition metal phosphides (TMPs) have been loaded onto the P doped g-C 3 N 4 (PCN) to construct catalysts TMPs/PCN. For the first time, the effect of geometrical structure of TMPs on the photocatalytic activity is optimized and a geometrical-site-dependent photocatalytic hydrogen evolution is experimentally determined. Tri-metallic FeCoNiP/PCN, having 59.6% occupancy of tetrahedral cobalt sites, gives hydrogen production rate of 205 μmol/g/h, better than that of mono-metallic (FeP, CoP , NiP), bi-metallic (FeCoP, CoNiP, FeNiP) TMPs/PCN, and even much superior to that of Pt/b-g-C 3 N 4 and Pt/PCN. Trimetallic TMPs/PCN catalysts also show excellent OER performance. In addition to the efficient electron transfer between FeCoNiP and PCN, which can effectively improve the separation of photogenerated carriers, the high occupancy of tetrahedral cobalt sites of FeCoNiP as a co-catalyst promotes the formation of active intermediates, being the key to significantly improve the catalytic performance of ternary FeCoNiP/PCN. The findings in this work, especially about a link of the photocatalytic performance of TMPs/PCN composites and occupancy of tetrahedral cobalt site in co-catalysts TMPs, can open new occasion for creating novel composite catalysts and extending to other applications.
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MOLECULES
·
2022
·Vol. 27
·期 21
·7178
·
IF 4.927
Yan Chen,Ao Li,Xiuli Fu,Zhijian Peng
The difficulty of exposing active sites and easy recombination of photogenerated carriers have always been two critical problems restricting the photocatalytic activity of g-C3N4. Herein, a simple (NH4)2MoO4-induced one-step calcination method was successfully introduced to transform bulk g-C3N4into g-C3N4/MoO2composites with a large specific surface area. During the calcination, with the assistance of NH3and water vapor produced by ammonium molybdate, the pyrolytical oxidation and depolymerization of a g-C3N4interlayer were accelerated, finally realizing the exfoliation of the g-C3N4. Furthermore, another pyrolytical product of ammonium molybdate was transformed into MoO2under an NH3atmosphere, which was in situ loaded on the surface of a g-C3N4nanosheet. Additionally, the results of photocatalytic hydrogen evolution under visible light show that the optimal g-C3N4/MoO2composite has a high specific surface area and much improved performance, which is 4.1 times that of pure bulk g-C3N4. Such performance improvement can be attributed to the full exposure of active sites and the formation of abundant heterojunctions. However, with an increasing feed amount of ammonium molybdate, the oxidation degree of g-C3N4was enhanced, which would widen the band gap of g-C3N4, leading to a weaker response ability to visible light. The present strategy will provide a new idea for the simple realization of exfoliation and constructing a heterojunction for g-C3N4simultaneously.Keywords:g-C3N4;MoO2;exfoliation;photocatalytic hydrogen evolution
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DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Afzal Ali,Adeel Ahmed,Muhammad Usman,Tahir Raza,Muhammad Safdar Ali,Abdulhmeed Al-Nahari,Changbao Liu,Dong Li,Chunhu Li
Unintentional leakage of dyes into the aquatic environment has exacerbated global contamination of water resources in recent years, posing a serious danger to aquatic life and human health. As a result, highly adaptable and effective measures are required to address the worldwide environmental challenge posed by dye usage. Herein, we have adopted hydrothermal technique to synthesize a visible light-induced catalyst based on the Ce 0.2 Co 0.8 Fe 2 O 4 /g-C 3 N 4 composite. The catalysts were characterized in terms of their morphological, structural, and photoluminescence properties. The photocatalytic proficiency of the Ce 0.2 Co 0.8 Fe 2 O 4 /g-C 3 N 4 composite was determined by its ability to degrade rhodamine B (RhB) under visible light irradiation. Ce 0.2 Co 0.8 Fe 2 O 4 /g-C 3 N 4 exhibited superior degradation potential, degrading RhB to 90.27 % in 60 min, compared to CoFe 2 O 4 /g-C 3 N 4 (72.28 %), Ce 0.2 Co 0.8 Fe 2 O 4 (64.45 %) and CoFe 2 O 4 (56.63 %) under predetermined reaction conditions (catalyst dosage = 0.4 g/L, RhB concentration = 20 mg/L, pH = 7, T = 25 ± 1 °C). The substantial increase in photocatalytic potential was attributed mostly to the interfacial migration of photo-induced charge carriers from g-C 3 N 4 to Ce 0.2 Co 0.8 Fe 2 O 4 , which may facilitate electron migration. The as-synthesized catalyst demonstrated outstanding stability in four successive cycles. This study may provide a low-cost approach for fabricating visible-light responsive catalysts for use in environmental remediation applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Qiang Yang,Jing Guo,Sen Zhang,Fucheng Guan,Yue Yu,Qiang Yao,Xin Zhang,Yi Xu
To prepare novel medical dressings with excellent comprehensive properties, this work uses the polyvinyl alcohol-allyl polyethylene glycol graft copolymer (PVA-g-APEG) synthesized in our previous work as a modifier. The polyvinyl alcohol (PVA)/polyethylene oxide (PEO)/PVA-g-APEG nanofiber membranes with different PVA-g-APEG contents are successfully prepared by electrospinning technology. The biomimetic natural extracellular matrix structure of nanofiber membranes is achieved by regulating the PVA-g-APEG contents. As the content of PVA-g-APEG is 4 wt%, the diameter distribution of nanofibers is the narrowest. The average diameter of nanofibers reaches the minimum value of 267.18 nm, and the porosity of nanofiber membranes reaches the maximum value of 77.90%. Meanwhile, nanofiber membranes possess excellent biocompatibility. The absorption capacity of the nanofiber membranes for different liquids is improved with higher PVA-g-APEG content. The nanofiber membranes become soft and slippery after contact with liquid, effectively avoiding adhesion with cells. The cell proliferation rate is higher than 100%, and the cytotoxicity grade is 0. Additionally, the mechanisms of intermolecular interactions , crystallization and mechanical properties change of nanofiber membranes are discussed systematically. It provides a method and idea for preparing high-strength PVA/PEO nanofiber membranes and realizing the practical application of PVA/PEO composite systems in medical dressings.
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CARBON
·
2022
·
IF 11.307
Xiang Yu,Yue Zhan,Tingting Fan,Yuqi Zhang,Shunqin Liang,Limin Sun,Xiaoli Hu,Weiping Fang,Zhou Chen,Xiaodong Yi
The stabilization and transport of the reactants, intermediates and products are significant to rational design of an industrial catalyst. In this work, we encapsulated the surface of Pd/g-C 3 N 4 catalyst with acrylic acid (AA) using a photo-induced grafting method to mimic the 3-dimensional nature of enzymes. A combined characterization and ab initio calculation revealed that AA ligands on the surface controlled the adsorption and diffusion behaviors of the reactants, rather than alter the electronic or geometric properties of Pd active centers. The optimized catalyst (Pd/CNA-4) significantly enhances isoprene partial hydrogenation activity without a decline in semi-hydrogenation selectivity. This approach can be further optimized by changing the types of the encapsulating ligands and can meet other specific catalytic reactions to regulate their conversion and selectivity and is therefore expected to extend to other areas of heterogeneous catalysis .
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jiangfu Zheng,Changzheng Fan,Xiaoming Li,Qi Yang,Dongbo Wang,Abing Duan,Shuaijun Pan,Baowei Zhang,Jinglin Ding,Shengxiang Rong,Haoyu Yin
Development of efficient nanomaterials for photocatalytic degradation is very important in the removal of organic pollutants from water. The oxygen vacancy-rich g-C 3 N 4 / LDH composites (g-C 3 N 4 /LDH-OVs) with a layered structure was prepared for the efficient photocatalysis degradation and mineralization of tetracycline hydrochloride (TC) under visible light irradiation. Oxygen vacancies in the composites achieved through structural induction strategy not only provide abundant active sites but also improve the separation efficiency of the photo-generated carriers, thereby enhancing the degradation and mineralization of TC, as revealed both by theories and experiments. The optimized g-C 3 N 4 /LDH-OVs have achieved excellent photocatalytic activity (i.e., 95 % degradation and 28 % mineralization of TC after 60 min of visible light irradiation), which was 2.3 and 3.5 times higher than that of the pristine g-C 3 N 4 and LDH-OVs, respectively. Furthermore, experimental results based on bio-acute toxicity show that the g-C 3 N 4 /LDH-OVs/Vis system can effectively detoxify the transformation products. This study provides an insight into the development of LDH-based photocatalysts, so as to realize photocatalytic mineralization and simultaneous detoxification through the new strategy of oxygen vacancy defect engineering.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Shuying Gao,Lingling Pan,Weiguo Kong,Li Zhou,Jian Wu,Shijian Zhou,Weilong Shi,Fu Yang,Yan Kong
In this study, an energetic materials (EM) deflagration process coupled with a gas-shocking exfoliation strategy was proposed for the in-situ introduction of a π-electron-conjugated structure into ultrathin g-C 3 N 4 nanosheets. The optimal 2C-CNS sample was endowed with a porous-ultrathin-nanosheets morphology (3–4 nm thickness), larger exposed surface area (144.1 m 2 /g), and significant pore volume (0.51 cm 3 /g). Using urotropin-deflagration and gas-shocking-driven processes, the precursors were dissociated and copolymerized in an aqueous solution into g-C 3 N 4 nanosheets chemically modified with conjugated carbon moieties. Most importantly, an expanded π-electron conjugated system was successfully constructed between the carbon moieties that interacted with the ultrathin g-C 3 N 4 (2C-CNS), which endowed its with a faster electron-hole separation efficiency and enhanced visible-light harvesting ability. The H 2 evolution rate and Cr 6+ reduction efficiency for 2C-CNS reached 2360 μmol h −1 g −1 for k = 0.0301 min −1 , which was almost 25.8/23 times higher than that of bulk g-C 3 N 4 (Bu-CN, 91.2 μmol h −1 g −1 , k = 0.0013 min −1 ). Also, 2C-CNS showed 2.8/2.4 times higher performance than the g-C 3 N 4 ultrathin nanosheets without a carbon-section modification (0C-CNS, 853 μmol h −1 g −1 , k = 0.0125 min −1 ).
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yisheng Xu,Yaoheng Liang,Zeng Yuai,Hangyu Long,Qizhi He,Kaijin Guo,Yuyuan Zhang,Dongchu Chen,Xuejun Xu,Huawen Hu
Although g-C 3 N 4 (CN) materials have been extensively explored for the photocatalytic degradation of organic pollutants, their weak response to visible light and fast recombination of photoexcited electron-hole pairs restrain their practical applications. Herein, we deeply mediated the CN's energy-band structure, morphology, and surface properties by non-metal (P) and metal (Mo) co-doping based on the thermal treatment of a phosphomolybdic acid hydrate and dicyandiamide mixture in a straightforward one-step manner. Meanwhile, cyano groups and nitrogen vacancies were generated as a result of the co-doping, and the resulting P, Mo co-doped CN (PM-CN) exhibited thinner layers, smaller sizes, and superior visible-light harvesting capacity and charge separation efficiency. Consequently, highly active PM-CN was obtained for photocatalytic tetracyclines (TC) degradation, and the rate was calculated to be 0.01 min −1 , 3.3 times greater than that of the pure CN, outstripping the single P- and Mo-doped counterparts. A free radical scavenging test demonstrated that the reactive species •O 2− and h + were critical in TC degradation. The present work is expected to shed light on co-doping CN with non-metal and metal elements to obtain high-performance, visible-light-responsive photocatalysts for practical environmental remediation.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 40
·61148-61160
·
IF 5.19
Cao Yunmeng,Yue Lin,He Zhuang,Li Zaixing,Lian Jing,Zhou Shilei,Luo Xiao
In this study, the flower-shaped Bi 2 S 3 /g-C 3 N 4 -2.6 heterojunction obtained by solvothermal method and its photocatalytic degradation efficiency of rhodamine B (RhB) and tetracycline (TC) in aqueous solution within 40 min is as high as 98.8% and 94.6%. For RhB degradation, the photocatalytic reaction rate constant (k) of Bi 2 S 3 /g-C 3 N 4 -2.6 is approximately 1.8 and 45.5 times that of Bi 2 S 3 and g-C 3 N 4 . For TC, k is 3.1 and 2.4 times that of Bi 2 S 3 and g-C 3 N 4 , respectively. The key to determining the high catalytic activity of Bi 2 S 3 /g-C 3 N 4 lies in the formation of a good heterojunction between Bi 2 S 3 and g-C 3 N 4 , which accelerates the electron transfer rate between the heterojunction interface and effectively avoids electron–hole recombination. The effects of catalyst dosage, different pH values, inorganic anions, and capture agents on the photodegradation performance of RhB were investigated. The results show that the catalyst dosage is 1.33 g/L, and the solution pH is in the range of 5–9, which has the best removal effect on pollutants, and the isolation of holes ( h + ) with strong oxidizing ability promotes the collapse of pollutant molecules. Combined with electrochemical tests, a possible degradation mechanism was advised.
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Materials
·
2022
·Vol. 15
·期 4
·1391
·
IF 3.748
Jiajing Zhang,Yongjie Zheng,Heshan Zheng,Tao Jing,Yunpeng Zhao,Jingzhi Tian
Antibiotic contamination has received widespread attention globally. In this work, the oxygen-doped porous graphite carbonitride (g-C3N4) was prepared with urea and ammonium oxalate (CNUC) or urea and glycine (CNUG) as precursors by thermal polymerization. Using bisphenol A (BPA) as a probe and CNUC or CNUG as photocatalysts, the removal performance test was carried out. Meanwhile, all prepared photocatalysts were characterized by XRD, FT-IR, SEM, TEM, XPS, UV-Vis DRS, PL and EIS. Under visible light irradiation, both CNUC and CNUG exhibited about seven and five times greater photocatalytic activity than that of pure g-C3N4, respectively. The radical capture experiments verified that superoxide radicals (•O2−) and holes (h+) were the main active species in the photocatalytic degradation of BPA by CNUC, and the possible photocatalytic mechanism of CNUC was proposed. In addition, all these results indicate that CNUC catalyst can effectually inhibit the photocorrosion and keep superior stability. The proposed technique provides a prospective approach to develop nonmetal-modified photocatalysts for future applications.Keywords:copolymerization;g-C3N4;oxygen-doped;visible light degradation;photocatalysis
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