RSC Advances
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2020
·Vol. 10
·期 46
·27538-27551
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IF 3.119
Qi Wang,Bihan Li,Ping Zhang,Wenming Zhang,Xiaoru Hu,Xiaochen Li
A novel, efficient and stable 2D black phosphorus and tungsten trioxide heterojunction (WO3–BPNs) was successfully synthesized using a combined hydrothermal, liquid phase exfoliating and co-precipitation method. The as-obtained WO3–BPNs composite was characterized by using XRD, SEM, XPS, UV-vis, etc. The results showed that the bandgap energy of the WO3–BPNs50 sample was 2.2 eV, which was lower than that of pure WO3. BPNs in the WO3–BPNs heterojunction as a co-catalyst effectively enhanced photo-generated electron–hole pairs separation. The synthesized WO3–BPNs sample significantly improved the photocatalytic performance in degrading rhodamine B (RhB) and metoprolol (MET) compared to pure WO3 and BPNs under visible-light. The maximum RhB and MET removal efficiencies were 92% and 87%, respectively, in the WO3–BPNs50 (added 50 mL BPNs dispersion) sample within 120 minutes. The relevant photocatalysis mechanisms were discussed. In addition, the intermediate products in the MET photodegradation process were investigated by LC-MS technology, and the degradation pathway of MET was proposed.
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Frontiers in Microbiology
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2020
·
IF 4.236
Wang Xiaoshuai,Chen Lei,Liu Jing,Sun Tao,Zhang Weiwen
myo-inositol (MI) is an essential growth factor, nutritional source, and important precursor for many derivatives like D-chiro-inositol. In this study, attempts were made to achieve the “green biosynthesis” of MI in a model photosynthetic cyanobacterium Synechocystis sp. PCC 6803. First, several genes encoding myo-inositol-1-phosphate synthases and myo-inositol-1-monophosphatase, catalyzing the first or the second step of MI synthesis, were introduced, respectively, into Synechocystis. The results showed that the engineered strain carrying myo-inositol-1-phosphate synthase gene from Saccharomyces cerevisiae was able to produce MI at 0.97 mg L–1. Second, the combined overexpression of genes related to the two catalyzing processes increased the production up to 1.42 mg L–1. Third, to re-direct more cellular carbon flux into MI synthesis, an inducible small RNA regulatory tool, based on MicC-Hfq, was utilized to control the competing pathways of MI biosynthesis, resulting in MI production of ∼7.93 mg L–1. Finally, by optimizing the cultivation condition via supplying bicarbonate to enhance carbon fixation, a final MI production up to 12.72 mg L–1 was achieved, representing a ∼12-fold increase compared with the initial MI-producing strain. This study provides a light-driven green synthetic strategy for MI directly from CO2 in cyanobacterial chassis and represents a renewable alternative that may deserve further optimization in the future.
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RSC Advances
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2020
·Vol. 10
·期 73
·45171-45179
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IF 3.119
Huimin Liang,Caizhi Lv,Hanjiao Chen,Lan Wu,Xiandeng Hou
Due to the film-forming ability of polymers, a variety of photocatalytic membranes (PMs) based on polymers easily being separated and reused have been constructed for wastewater contaminant treatment. During their construction processes, chitosan (CS) as a bio-polymer with its distinct merits of abundant resources, low-cost and environmental-friendliness, as well as formability and ease of modification, has attracted great attention. However, the role of CS was mostly believed to be just a support or an adsorbent for fixing or dispersing photocatalysts. Whether CS possessed photocatalytic activity or not still remained vague. Herein, in this work, CS membranes (CSM) were facilely prepared for photocatalytic degradation of tetracycline hydrochloride (TC, a model organic pollutant) in aqueous solution, and its photocatalytic performance was investigated and compared with that of CSP (CS powder) and TiO2-P25 (a commercially used photocatalyst). The results showed that the single-phased CSM exhibited a better visible light photocatalytic activity. After visible light irradiation for 60 minutes, the degradation efficiency of TC can reach above 90% when the CSM was used as a photocatalyst, while with the same irradiation time interval, less TC could be degraded over both CSP and TiO2-P25. Through radical scavenging and EPR experiments, ˙O2− and h+ were found to be the main active oxygen species generated in the reaction system for TC degradation. After being washed with 2 wt% NaOH solution, the CSM revealed a good recyclability implying its potential for practical applications. This study would provide a certain theoretical and data basis for the future development of CS-based PMs and photocatalysts.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Wenjia Kong,Qinyan Yue,Yue Gao,Qian Li,Xing Xu,Yan Kong,Baoyu Gao
The sever antibiotics pollution in water environment has been a worldwide concern. In this research, a poly acrylic acid (PAA)/graphitic C 3 N 4 (g-C 3 N 4 ) matrix loaded with zero valent iron (Fe 0 ) was synthesized. The PAA/g-C 3 N 4 -Fe 0 was confirmed to be an efficient photocatalyst for the degradation of sulfadimidine (SM2) under visible light. The dosage of g-C 3 N 4 and Fe 0 were optimized in line with photocatalytic performance. The as-prepared samples were comprehensively characterized through chemical structure, morphology, electrochemical and optical measurements. The photodegradation kinetics under different conditions (e.g. pollutant concentration, pH values, various ionic species and common organic component) were studied. The enhanced photocatalytic activity was due to the improved electron transfer efficiency by the evenly dispersed Fe 0 in PAA/g-C 3 N 4 network. The photodegradation of SM2 was confirmed to be driven by ·O 2 – and ·OH radicals originating from the active components induced by visible light. Based on the above experimental analysis, a possible photodegradation mechanism of PAA/g-C 3 N 4 -Fe 0 photocatalyst was thoroughly elucidated. Besides, the degradation intermediates of sulfadimidine were analyzed by liquid chromatography − mass spectrometer (LC-MS), and possible degradation pathways were proposed in coordination with the calculated results based on Density Functional Theory (DFT). Thus, this study revealed the great prospect of the as-prepared PAA/g-C 3 N 4 -Fe 0 photocatalyst in wastewater remediation.
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CATALYSIS LETTERS
·
2020
·Vol. 151
·期 6
·1766-1775
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IF 2.482
Zhou Yulan,Liao Wanfeng,Ni Xiuyuan
Abstract For the cationic photopolymerization of high value, we designed a new visible-light initiator complex consisting of the visible-light sensitive titanium dioxide (Py x% :TiO 2 , x = 3, 6, 9, 12), octanioc acid and iodonium salt (Iod). The ternary complex was proved to efficiently initiate the cationic ring-opening polymerization of the epoxide under the light irradiation at the wavelength of 520 nm. By using gas chromatography-mass spectra (GC-MS), electron spin resonance (ESR) and 1 H-nuclear magnetic resonance ( 1 H-NMR), the mechanism studies clearly presented that the Py x% :TiO 2 photocatalyzed the oxidation reaction of octanioc acid in the pathway of photo-Kolbe decarboxylation. Meanwhile, Iod was decomposed by the photocatalytic reduction reaction. The results of this visible-light photocatalytic cationic polymerization process were analyzed by using attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy and gel permeation chromatography (GPC). The conversion of the epoxide can reach up to 93.8%. Graphic Abstract
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Lihong Zhang,Siyi Ren,Chaowen Chen,Dongfang Wang,Bin Liu,Dongqing Cai,Zhengyan Wu
A near infrared light (NIRL)-driven release imidacloprid (NDRI) with magnetic collectability property was constructed using agarose hydrogel (AG), CuS-polydopamine (CP), zeolitic imidazolate framework-8 (ZIF-8), imidacloprid (IM), and ferriferrous oxide (Fe 3 O 4 ). Therein, ZIF-8 with a large specific surface area was used to efficiently load IM molecules. CP, as a photothermal agent, could soften AG and enlarge the pores in hydrogel spheres under NIRL, resulting in the release of IM. After release, Fe 3 O 4 was beneficial to conveniently collect the remaining NDRI from water. Additionally, the AG hydrogel with a porous structure acted as a good carrier for NDRI. Importantly, NDRI possessed an outstanding controlled-release property and could be reutilized at least for four times. Consequently, this technology may provide a potential approach to control release of IM, improve utilization efficiency, and decline pesticide usage and contamination to environment.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Qing Guan,Sara Khan,Zhaohua Wang,Qian Liu,Leilei Zhang,Yongjie Zhao,Xianze Wang,Xia Yang,Zhi Geng
A critical issue in the removal of fluoroquinolone antibiotics, which were frequently detected in drinking water sources and water treatment plants, is the design of highly efficient photocatalysts . In order to utilize visible-light, improve the electrons transfer and reduce the recombination of photogenerated carriers, TiO 2-X /Ag 3 PO 4 heterojunctions were fabricated by hydrothermal technology combined with the coprecipitation method for the first time. The morphological, structural, and optical properties of as-prepared catalysts were extensively characterized. In comparison with single-phase TiO 2-X and Ag 3 PO 4 , TiO 2-X /Ag 3 PO 4 composite exhibited enhanced photocatalytic efficiency for the degradation of methyl orange (MO) and gatifloxacin (GAT). Especially for the composite with the mole ratio of TiO 2-X and Ag 3 PO 4 was 1:1, the reduction of antimicrobial activity of the GAT byproducts reached 82.4% after 5 min visible-light irradiation. Furthermore, the pathway in photocatalytic decomposition of GAT was proposed by HPLC-MS and the electron transfer mechanism over TiO 2-X /Ag 3 PO 4 heterojunctions was suggested by the radical capture experiments, transient photocurrent responses, and electrochemical impedance spectroscopy tests.
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Journal of Cleaner Production
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2020
·
IF 7.246
Yingying Shi,Zhuan Yan,Yingtao Xu,Tian Tian,Jing Zhang,Jianfeng Pang,Xihua Peng,Qianghua Zhang,Mingli Shao,Wenyi Tan,Hailun Li,Qingping Xiong
Tetracycline hydrochloride (TC) wastewater has complex components, high concentration of organic matter and certain biological toxicity. Photocatalytic degradation is of great application prospect due to its green, thorough and efficient removal of TC. In this study, heterojunction photocatalyst supported on Palygorskite (Pal) AgBr–TiO 2 -Pal with visible light response was successfully prepared via sol-gel and liquid deposition method successfully. Taking TC as the target pollutant, the photocatalytic performance of AgBr–TiO 2 -Pal photocatalys excited by visible light was studied. The spreading/grafting of AgBr–TiO 2 on the surface of Pal was improved by a series of structural characterization and composition analysis. The results also demonstrated that the specific surface area of AgBr–TiO 2 -Pal was about 48.06 m 2 ⋅g −1 with uniform mesoporous slit. The AgBr–TiO 2 -Pal catalyst was very effective for the degradation of TC, and it still retained its high stability and reusability after five cycles. The results showed that under the best reaction conditions (initial concentration of tetracycline 10 mg⋅L −1 , catalyst dosage 0.5 g⋅L −1 , pH value 9), with the excitation of visible light, the maximum removal ratio of TC was 90%, and the mineralization ratio was 67%. The removal efficiency and degradation rate of TC by AgBr–TiO 2 -Pal catalyst were 2.17 and 4.75 times as much as those of TiO 2 respectively. The outstanding photocatalytic performance of heterogeneous AgBr–TiO 2 -Pal catalyst was obtained by fully participate in the reaction by photoinduced charge. This study could be expected to be used in photocatalytic degradation of antibiotic pollutants in wastewater treatment .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Zhao Du,Lang Feng,Zhonglu Guo,Tongqi Yan,Qi Hu,Jing Lin,Yang Huang,Chengchun Tang,Yi Fang
Herein, a series of ultrathin h-BN/Bi 2 MoO 6 heterojunction with excellent photocatalytic activity has been firstly prepared via a feasible solvothermal method . Our results suggest that the optimized photocatalyst possesses a high degradation ratio of tetracycline (TC), oxytetracycline (OTC) and doxycycline (DC) up to 99.19%, 95.28% and 91.04% under visible-light irradiation, respectively. We highlight that the outstanding photocatalytic activity is mainly attributed to the prominent performance of tetracycline adsorption on h-BN and the dominant visible-light absorption by Bi 2 MoO 6 as well as the effective photogenerated carrier separation induced by the synergetic effect between h-BN and Bi 2 MoO 6 . Moreover, DFT calculations reveal that the built-in electric field formed between h-BN and Bi 2 MoO 6 gives rise to the separation of carriers and the polarization of tetracycline molecules. Last but not the least, the specific process and micro-mechanism of the photocatalytic tetracycline degradation under visible-light driven have also been illuminated. The present work pioneers the application of ultrathin h-BN/Bi 2 MoO 6 heterojunction as a novel tetracycline degradation photocatalyst and further guides the design of more visible-light photocatalysts.
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Nature Photonics
·
2020
·Vol. 15
·期 3
·238-244
·
IF 31.241
Chen Jiawei,Wang Jian,Xu Xiaobao,Li Jinhang,Song Jizhong,Lan Si,Liu Sinan,Cai Bo,Han Boning,Precht Jake T.,Ginger David,Zeng Haibo
At present, electric lighting accounts for ~15% of global power consumption and thus the adoption of efficient, low-cost lighting technologies is important. Halide perovskites have been shown to be good emitters of pure red, green and blue light, but an efficient source of broadband white electroluminescence suitable for lighting applications is desirable. Here, we report a white light-emitting diode (LED) strategy based on solution-processed heterophase halide perovskites that, unlike GaN white LEDs, feature only one broadband emissive layer and no phosphor. Our LEDs operate with a peak luminance of 12,200 cd m −2 at a bias of 6.6 V and a maximum external quantum efficiency of 6.5% at a current density of 8.3 mA cm −2 . Systematic in situ and ex situ characterizations reveal that the mechanism of efficient electroluminescence is charge injection into the α phase of CsPbI 3 , α to δ charge transfer and α–δ balanced radiative recombination. Future advances in fabrication technology and mechanistic understanding should lead to further improvements in device efficiency and luminance.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
IF 16.683
Yechen Wang,Yaru Wang,Jianjun Zhao,Min Chen,Xubo Huang,Yiming Xu
Production of H 2 O 2 via a more economic, green and safe way is challenging. In this work, we report an efficient production of H 2 O 2 from oxygen reduction reaction (ORR) in aqueous solution over a modified WO 3 with Au nanoparticles . Under visible light at wavelengths longer than 420 nm for 5 h, H 2 O 2 measured from WO 3 and Au/WO 3 were 1.07, and 177 μM, respectively. On addition of methanol, H 2 O 2 obtained from WO 3 , Au/WO 3 , and Au/SiO 2 were 8.55, 544, and 0.36 μM, respectively. Photoluminescence and electrochemical measurement revealed that there was an interfacial electron transfer from the excited WO 3 to Au, followed by two-electron reduction of O 2 on Au sites. Under visible light at wavelengths longer than 535 nm, interestingly, H 2 O 2 was also produced from Au/WO 3 (39 μM at 5 h), while the photocurrent of water oxidation on Au/WO 3 was much larger than those on Au/SiO 2 and WO 3 . Clearly, there is also an interfacial electron transfer from the plasmonic Au to WO 3 , followed by ORR to H 2 O 2 , but such a process fails when WO 3 is excited. However, the production of H 2 O 2 on Au/WO 3 was determined by several factors, including Au content, light absorption, and particle size. A maximum H 2 O 2 was observed at an initial pH 3.0 from 0.35 wt% Au/WO 3 , prepared at 400 °C. Moreover, at the same loading on WO 3 , Au was more efficient than Pd, Ag, Pt, Ni, Cu, and Co, while at the same Au loading, WO 3 was more efficient than BiVO 4 and Bi 2 WO 6 . The superior performance of Au/WO 3 is mainly due to its ability to undergo selective ORR to H 2 O 2 , and to release protons into aqueous solution protecting H 2 O 2 from decomposition.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Junlun Zhu,Guan Luo,Xu Peng,Wei Wen,Xiuhua Zhang,Shengfu Wang
Self-powered sensing platforms have received widespread attention in areas such as portable, wearable and point-of-care devices. Here we reported visible light mediated self-powered electrochemical sensing based on target induced recombination of photogenerated carriers, which has highly sensitive to detect copper ions concentration. We utilized the recombination of photogenerated carriers mechanism to design visible light-responsive Fe 2 O 3 -CdS n-n heterojunction as photoanode material, which greatly improved the problem of output energy in photocatalytic self-powered sensors. Expectedly, our proposed visible light mediated self-powered electrochemical system has high separation efficiency of photogenerated carriers, which is 8.4 times that in presence of Cu 2+ . Furthermore, this self-powered electrochemical sensing platform used Cu 2+ induced recombination of photogenerated carriers, showed a clear linear relationship from 1 nM to 5000 nM with an acceptable detection limit of 0.4 nM. This self-powered electrochemical sensing platform with excellent selectivity , accredited reproducibility and believable stability exhibited promising prospects in developing portable sensing devices and detection chip for real-time and rapid monitoring of Cu 2+ .
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