JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2022
·Vol. 98
·期 2
·498-505
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IF 3.709
Qingping Du,Zuanjia Zhong,Ting Zhang,Yanbin Xu,Guoqing Zhang,Shangquan Wu,Jiaxin Xu
Background Biotricking filtration (BTF) based on absorption and biodegradation of waste gas by microorganisms in a biofilm can be used to degrade with difficulty hydrophobic volatile pollutants. Photocatalysis is a promising technology for the abatement of gaseous contaminants because of its nonselective oxidation of volatile organic compounds; however, photocatalysis technology has the limitations of high energy consumption and low mineralization efficiency. This study, therefore, aimed to investigate the synergistic effects of UV/TiO 2 photocatalysis (PCO) pretreatment and BTF in treating gaseous m -xylene. Results BTF incubated with a mold, Aspergillus sp. S1, was acclimated with m -xylene as the sole carbon source. A combined system of PCO with BTF was developed to remove gaseous m -xylene. The results showed that the startup period was shortened by 3 days in the PCO-BTF combined system compared to that with BTF alone. The removal efficiency reached 73% and 91% for the BTF and PCO-BTF systems respectively when the empty bed residence time was extended to 90 s. In addition, PCO-BTF could withstand transient shock loading of m -xylene of 5000 mg m −3 and gradually restore its decontamination performance. Conclusions PCO pretreatment was effective in the enhancement of the removal capacity of BTF for m -xylene. The PCO-BTF system proposed in this study provides an attractive alternative to abate hydrophobic volatile pollutants. The integration of PCO essentially prompted the capability of Aspergillus sp. S1 in the BTF unit, which paves the way for the treatment of gaseous waste at an industrial scale. © 2022 Society of Chemical Industry (SCI).
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SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Haochen Zhang,Zhuoyu Li,Xiaoqun Zhou,Xiaohui Lu,Haiteng Gu,Jun Ma
The UV/chlorine (UC) system is a homogeneous advanced oxidation process with increasing attention in water decontamination . The addition of TiO 2 is a newly found strategy to enhance the generation of hydroxyl radical (HO • ) and chlorine radical (Cl • ) in the UC system. However, the crucial role of chlorine oxide radical (ClO • , generated by the reactions of HO • and Cl • with chlorine) on pollutant degradation , has not been noticed in UV/chlorine/TiO 2 (UCT), the heterogeneous photocatalytic system for chlorine activation. Herein, the role of ClO • in UCT was clarified through quenching experiments combined with model simulations during carbamazepine degradation. Tert -butyl alcohol completely inhibited while bicarbonate only partly suppressed carbamazepine degradation in UCT, indicating the important role of ClO • . The second-order reaction rate constant between ClO • and carbamazepine ( k ClO•,carbamazepine ) was fitted to be (1.21 ± 0.08) × 10 7 M −1 s −1 by the kinetic model, which avoided the influence of carbonate radical (CO 3 •− ), whose contribution couldn't be excluded during k ClO•,carbamazepine determination in commonly used competitive kinetic methods with bicarbonate. With the obtained k ClO•,carbamazepine , model simulation suggested that ClO • contributed about 50 % to carbamazepine degradation in UCT, and its concentration was less affected under varied conditions (solution pH, chlorine, bicarbonate, and chloride concentration) to keep an efficient carbamazepine degradation. On the contrary, pollutant degradation dominated by HO • in UCT was largely inhibited with the increase of pH, chlorine, and bicarbonate concentration. In addition to the promotion of degradation efficiency, less disinfection byproducts and lower energy requirement were found in UCT compared with UC. Furthermore, UCT could maintain satisfactory degradation efficiency and energy saving in ground water and surface water samples. Results of this study unraveled the crucial role of ClO • for pollutant degradation in UCT, and showed bright prospects and great potentials of the system in water treatment .
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Fangya Qi,Lianyi Shao,Xiaoyi Lu,Guoping Liu,Xiaoyan Shi,Zhipeng Sun
Establishing heterostructure is an effective strategy to improve the cycling and rate properties of electrode due to high charge transfer kinetics. Nevertheless, it is still a great challenge to prepare a reasonable heterojunction material with appropriate electrochemical property as anode for Na/K ion batteries. In this work, a novel MXene derivative consisted of TiSe 2 /TiO 2 /C heterostructured hexagonal prism has been prepared by a simple solid phase sintering method to converting Ti 3 C 2 T x MXene to TiSe 2 /TiO 2 /C. In this composite, TiSe 2 and TiO 2 with different work functions can induce a built-in electric field in the heterojunction interface, accelerating the electrochemical courses. Serving as an anode material for Na ion batteries , TiSe 2 /TiO 2 /C can keep a discharge capacity of 280 mAh g −1 at 5 A g −1 after 1000 cycles and a superior rate capability with 212 mAh g −1 even at 10 A g −1 . Even using as anode for K ion batteries , TiSe 2 /TiO 2 /C can still retain a capacity of 121 mAh g −1 at 0.1 A g −1 after 800 cycles. This work supplies a simple approach to design metal oxide/selenide heterostructures toward Na/K ion batteries with excellent performance and promotes the application of MXene derivatives in the field of energy storage.
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JOURNAL OF POWER SOURCES
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2022
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IF 9.794
Richao Niu,Rubing Han,Shaochun Tang,Junwu Zhu
Graphene and MXenes, both as an emerging two-dimensional (2D) material, have become the predominant choice of electrochemical energy electrode materials owing to large surface-area-to-volume ratio and high electrical conductivity . However, severe restacking of such 2D ultrathin nanostructures largely lowers active surfaces and thus constrains their applications. Herein, we develop a microwave selective heating strategy that is highly efficient for ultrafast and scalable fabrication of novel coral-like porous MXene/graphene composite with high-quality graphene and well-dispersed TiO 2 nanocrystals . The MXene not only works as a source material but also serves as an excellent microwave absorbent, which leads to that reduction of graphene oxides can be completed within only 10 s under microwave irradiation at a much lower applied power of 200 W than the reported value of 1000 W. Especially the coral-like TiO 2 -MXene/graphene material with large porosity delivers much higher capacity (356 mAh g −1 at 50 mA g −1 ) and much better rate capability than those for pure graphene, MXene and other MXene/graphene composites. That is attributed to the composites avoids restacking, assures structural stability, and provides high specific surface area and excellent electrons/ions conductivity. This work provides a new route to large-scale and low-cost production of high-performance electrode materials for lithium-ion battery.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Fang Yuan,Renfeng Yang,Chunquan Li,Xiangwei Zhang,Zhiming Sun
How to improve the photocatalytic performance of titania-based photocatalyst under visible light in environmental remediation remains a challenge. Herein, three kinds of bismuth semiconductors, including Bi 2 MoO 6 , BiOCl and BiVO 4 , are selected to construct heterojunctions with diatomite supporting titania for improving photocatalytic performance towards formaldehyde (HCHO) under visible light. The morphologies and microstructures as well as the photocatalytic performance of the as-received samples are systematically investigated for comparation. The Bi 2 MoO 6 -TiO 2 /diatomite (MTD-50) composite has the optimal performance, followed by BiOCl-TiO 2 /diatomite (CTD-100) composite and BiVO 4 -TiO 2 /diatomite (VTD-75) composite, whose mineralization rate is up to around 47.58 times, 29.55 times and 21.14 times that of TiO 2 /diatomite (TD) composite, respectively. Moreover, the performance enhancement mechanism could be attributed to their relatively high quantum efficiency that originated from the heterojunctions, resulting in the high generation efficiency of active radicals. This work would like to compare bismuth semiconductor photocatalysts for enhancing visible-light properties through heterojunction and provide comparative references for developing novel visible light driven photocatalysts in the field of indoor HCHO purification.
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Environmental Science-Water Research & Technology
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2022
·Vol. 8
·期 10
·2231-2244
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IF 5.819
Jun Zhao,Jingquan Wang,Erdeng Du,Yijie Ai,Jingjing Liu,Hongguang Guo
The increasing need for water decontamination under high salinity conditions calls for alternative processes with high efficiency and cost-effective performance, of which electrochemical technologies hold continuous attraction. Compared to several studies under chloride background, contaminant degradation in high sulfate concentrations using electrochemical methods has rarely been studied. In this study, a facile and cost-effective TiO2 nanotube (NT) electrode, coated with a PbO2 layer was fabricated to serve as an anode to degrade the selected contaminant under the condition of high sulfate concentration. 100% removal of 0.05 mM 2,4-dichlorophenol (2,4-DCP) was achieved within 50 minutes at a relatively low current density. Degradation of 2,4-DCP followed pseudo-first-order kinetics in the electrochemical system, and the parameter of current density was proved to have the biggest effect on the pollutant removal performance compared to pH and salt concentrations. The mechanism of 2,4-DCP degradation followed the radical and direct electron transfer (DET) pathways. Even though the sulfate radical was generated in water containing high sulfate, the theoretical energy barrier calculated from density functional theory (DFT) simulation indicates the priority of hydroxyl radical on pollutant degradation, and the comparison of reaction energy based on experiments and DFT also suggested that the sulfate radical is more prone to act as a precursor for more hydroxyl radical formation. The degradation performance under various salt conditions was also investigated in this study. High content of chloride in water resulted in extremely fast removal performance, while high content of nitrate in water resulted in the apparent inhibition of pollutant removal. The as-made electrodes exhibited excellent performance for the degradation of different contaminants and reliable stability after rounds of use. This study provides an insight into the application of an electrochemical oxidation system in high salinity wastewater treatment.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
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IF 3.898
Yaoyao Peng,Lei Song,Siru Lu,Ziyu Su,Kui Ma,Siyang Tang,Shan Zhong,Hairong Yue,Bin Liang
The significant decrease of acid sites caused by alkali metal poisoning is the major factor in the deactivation of commercial V 2 O 5 -WO 3 /TiO 2 NH 3 -SCR catalysts. In this work, the solid superacid SO 4 2− -TiO 2 modified by sulfate radicals, was selected as the catalyst support, which showed superior potassium resistance. The physicochemical properties and K-poisoning resistance of the V 2 O 5 -WO 3 /SO 4 2− -TiO 2 (VWSTi) catalyst were carried out by XRD, BET, H 2 -TPR, NH 3 -TPD, XPS, in situ DRIFTS and TG. The results pointed out that the introduction of SO 4 2− significantly increased the NH 3 -SCR catalytic activity at high temperatures, with an exceptionally high NO x conversion over 90% between 275 °C and 500 °C. When 0.5% (mass) K 2 O was doped on the catalysts, the catalytic performance of the traditional V 2 O 5 -WO 3 /TiO 2 (VWTi) catalyst decreased significantly, while the VWSTi catalyst could still maintain a NO x conversion over 90% in the range of 300–500 °C. The characterizations suggested that the support of SO 4 2− -TiO 2 greatly increased the number of acidic sites, thereby enhancing the adsorption capacity of the reactant NH 3 . The results above demonstrated a potential approach to achieve superior potassium resistance for NH 3 -SCR catalysts using solid superacid.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Yi Yang,Bicheng Zhu,Libo Wang,Bei Cheng,Liuyang Zhang,Jiaguo Yu
Artificial photosynthesis offers a promising strategy for converting solar energy into environmental-friendly H 2 O 2 . Herein, robust photocatalytic H 2 O 2 production through dioxygen reduction is achieved, reaching a high H 2 O 2 yield of 873 μmol L −1 h −1 . The photocatalyst was prepared by in-situ chemical vapor deposition of N, S co-doped graphene on TiO 2 nanofibers. Thanks to the intimate interface with large area and Schottky junction, the H 2 O 2 yield of the composite can be increased by eight times than that of pristine TiO 2 . Experimental results and density functional theory calculations clarify that the strong synergistic effect between the doped N and S atoms provides abundant active sites to facilitate the electron transfer, promote the adsorption of O 2 molecules, and restrain the decomposition of formed H 2 O 2 by suppressing H 2 O 2 adsorption. This work not only provides a novel approach to build close contact between photocatalyst and co-catalyst, but also develops a highly efficient photocatalyst for H 2 O 2 production.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yuqing Lu,Chunsheng Ding,Jun Guo,Wei Gan,Peng Chen,Miao Zhang,Zhaoqi Sun
There is a high demand for photocatalysts that can efficiently degrade antibiotics; however, there are challenges in technological development related to charge transfer and light capture ability. In this study, ternary Bi 2 MoO 6 /GQDs/TiO 2 (denoted as BGT; GQDs refer to graphene quantum dots) heterojunction photocatalysts with high ciprofloxacin (CIP) photodegradation efficiency were successfully prepared. BGT with a 0.20 mL GQD dispersion solution (BGT-2) exhibited the highest CIP photodegradation efficiency (90.21 %). The rate constant of BGT-2 was 15.49 × 10 −3 min −1 , which was 4.01, 4.16, and 9.22 times higher than those of Bi 2 MoO 6 /TiO 2 (3.86 × 10 −3 min −1 ), Bi 2 MoO 6 (3.72 × 10 −3 min −1 ), and TiO 2 (1.68 × 10 −3 min −1 ), respectively. The degradation efficiencies of amoxicillin and tetracycline hydrochloride were 78.98 % and 92.49 %, respectively. The effects of pH values, water sources, and inorganic anions on CIP degradation were systematically explored. In addition, three environmentally friendly degradation pathways were proposed based on liquid chromatography-mass spectrometry (LC-MS) results and the toxicity evaluation of the various intermediates. Testing the optical and electrochemical properties of the catalysts showed that the synthesized dual Z-scheme heterojunctions can significantly improve the light capture ability and reduce the photogenerated electron-hole recombination rate, effectively addressing the challenges encountered with the use of photocatalysts.
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高影响因子
ELECTROCHIMICA ACTA
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2022
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IF 7.336
Cuilin Meng,Qiongfang Zhuo,Anqi Wang,Jingjing Liu,Zehong Yang,Junfeng Niu
In this study, TiO 2 nanotube arrays (TiO 2 -NTA) were used as an intermediate layer to provide effective electrocatalytic activity and stability for Ti/TiO 2 -NTA/Ti 4 O 7 anode. Compared with Ti/Ti 4 O 7 anode, Ti/TiO 2 -NTA/Ti 4 O 7 anode exhibited higher oxygen evolution potential (2.40 V), larger active specific surface areas (1.81 m 2 g −1 ), stronger radical generation capacity (64.42 μM), longer accelerated service life (56.0 h), and superior favipiravir removal ratio. The flow-through electrochemical reaction system was constructed by using the porous Ti/TiO 2 -NTA/Ti 4 O 7 anode. The removal ratio, TOC removal ratio and mineralization current efficiency of favipiravir in the flow-by electrochemical system were significantly improved and the energy consumption was reduced compared with the conventional flow-by electrochemical system, verifying the superiority of the porous flow-through Ti/TiO 2 -NTA/Ti 4 O 7 anode. The effects of operating parameters on the removal of favipiravir in the flow-through electrochemical reaction system were investigated. The degradation mechanisms of favipiravir are the synergetic effects of the free radical (·OH and SO 4 − ·) and the direct electron transfer. Ti/TiO 2 -NTA/Ti 4 O 7 anode displayed excellent stability in five consecutive cycles, exhibited significant removal ratio (87.7%) of favipiravir from actual wastewater, and remained efficient and versatile for a wide range of typical PPCPs pollutants. Therefore, Ti/TiO 2 -NTA/Ti 4 O 7 is a promising porous anode material in the engineering application.
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高影响因子
ChemCatChem
·
2022
·Vol. 14
·期 10
·e202200001
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IF 5.497
Helong Sun,Lufa Hu,Zhangyang Li,Junyu Lang,Chunling Wang,Xiaohao Liu,Yun Hang Hu,Fangming Jin
Graphical POMs : SiW 12 O x /TiO 2 was demonstrated as an ultra-stable heterogeneous catalyst with tailored molecular interfacial structure and super acidity for photocatalytic oxidation of methane to formic acid. This fabrication method could be relevant for other type POMs based photocatalyst, which provide a way to fabricate ultra-stable molecular interface photo-catalyst with highly efficiency. The interface and surface acidity of heterogeneous catalysts are widely applied to manipulate the catalytic performance. However, the interface structure prepared by traditional synthesis processes required multistep procedures, which was still lack of controllability and stability. Here, we show a general synthetic approach to fabricate ultra-stable heterogeneous catalysts with tailored molecular interfacial structure and super acidity in one step. The as-synthesized SiW 12 O x /TiO 2 catalyst was used for photo-catalytic conversion of methane to value-added oxygenates. We propose that the formed molecular interface W 12 −OH−Ti coupled with the introduced Brønsted acid sites of POMs, results in enhancing the photocatalytic performance. Namely, the addition of SiW 12 O x can reduce the recombination of electrons and holes for triggering charge separation owing to the photoelectron capturing by proton, improving electron transfer to reactants and thereby promoting catalytic activity. This fabrication method provides a way to build molecular interface photo-catalyst by POMs with super acidity and ultra-stable structure.
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高影响因子
Advanced Sustainable Systems
·
2022
·Vol. 6
·期 5
·2100516
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IF 6.737
Dawang Zhou,Li Wang,Fangzhou Zhang,Jing Wu,Huaping Wang,Jianping Yang
Fiber-based microplastic (FMP) pollution in the wastewater of the textile industry and urban sewage has become an emerging issue and a potential threat to marine life and human health. However, most reported reduction strategies, such as physical adsorption/filtration and chemical-catalytic degradation are limited by the secondary pollution caused by the desorption of FMPs and inferior degradation performance. Advanced technologies for efficient FMP control remain largely insufficient and underdeveloped. This work reports a Z-scheme Bi 2 O 3 @N-TiO 2 heterojunction synthesized by a solvothermal and wet-impregnation strategy. Bi 2 O 3 @N-TiO 2 degrades ≈10.23 ± 1.91 wt% of polyethylene terephthalate (PET)-FMPs (a major FMP existing in the environment) at pH = 9, which is nearly three times higher than that at pH = 7. Experimental results show that the hydrolysis of PET-FMPs in alkaline media is the main reason for the superior performance. Importantly, the hydrophilic, weight-average molecular weight and crystallinity of PET-FMP are the key factors affecting the photocatalytic degradation performance of PET-FMPs. This study demonstrates an eco-friendly strategy for remediation of FMP contamination.
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高影响因子
危险品化学品经营许可证（带存储）