CATALYSIS LETTERS
·
2019
·Vol. 149
·期 7
·2032-2042
·
IF 2.372
Wang Ying,Shen Shuguang,Li Meina,Sun Yujuan,Li Binbin,Ma Xueping,Zhou Zijian,Guo Chenyuan
Abstract MnO 2 was screened from various metal oxides and different crystal structures of MnO 2 were prepared, which were used to hydrolyze urea process wastewater for energy conservation and environmental protection. The characterizations of XRD, SEM, Raman, FT-IR, XPS and H 2 -TPR were employed and the hydrolysis experiments were carried out, demonstrating that oxygen vacancy on the surface of MnO 2 might be the catalytic activity source on urea hydrolysis. By optimizing reaction influencing factors, the residual urea concentration reduced to 1.61 mg/L over α -MnO 2 , far below the effluent standard. Meanwhile, the temperature of heterogeneous hydrolysis over α-MnO 2 dropped drastically compared with that of thermal hydrolysis. Further, the kinetic parameters of hydrolysis were obtained over α -MnO 2 . And α -MnO 2 also showed excellent recycling ability on the reused test. Graphical Abstract
Effect of different crystal structures MnO2 on urea degradation rate. (Catalyst dosage is 50 g/L, reaction time is 60 min, temperature is 165oC.)
研究领域:
环境化学
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催化科学
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废水处理
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材料化学
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绿色能源
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 12
·5319-5333
·
IF 4.5
Wang Yun,Tan Hongjie,Sang Lexian,Xie Yunying,Jia Fuchao,Zhou Tong,Yin Guangchao,Sun Fazhe,Wang Xiaomei
An optimized acetone gas sensor based on Ti 3 C 2 / α -Fe 2 O 3 (TF) composite materials was synthesized using microwave and etching methods. The structures, morphology and composition of the TF composites were characterized via XRD, XPS, SEM and TEM. The crystal of α -Fe 2 O 3 porous nanorods is hexagonal, and the α -Fe 2 O 3 nanoclusters formed from α -Fe 2 O 3 nanorods were adhered adequately on the lamellar Ti 3 C 2 MXene in the TF composite. The specific surface area and surface defects of the TF composites increased compared with pure α -Fe 2 O 3 nanocluster material, thus exposing a large number of gas adsorption sites. Furthermore, the excellent electrical conductivity and high free charges transfer ability of Ti 3 C 2 MXene provided more electrons for the gas-sensitive reaction and enhanced the transmission capacity of gas-sensitive reaction electrical signal, respectively. The Schottky barriers were formed at the interface of α -Fe 2 O 3 and Ti 3 C 2 MXene increasing the resistance of TF gas sensor in air, which is beneficial to the response of TF gas sensor. So, the gas-sensitive performance of TF gas sensor to acetone was greatly improved. The response of TF gas sensor to 100 ppm acetone was up to 23.38, which was nearly 2.3 times higher than pure α -Fe 2 O 3 gas sensor. The lower detection limit of TF gas sensor could be as low as 1 ppm. In addition, the TF gas sensor had excellent selectivity, long-term repeatability and stability for acetone.
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ACS Applied Nano Materials
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2023
·
IF 5.9
Qunling Fang,Jing Wang,Qingshan Xiong,Yunqi Xu,Guangjin Yu,Ailing Hui,Ken Cham-Fai Leung,Shouhu Xuan
Multifunctional photothermal nanomaterials offer notable opportunities for antimicrobial therapy due to their excellent antibacterial activities without leading to drug resistance. Herein, we report a facile one-step strategy for fabricating anisotropic corn-like α-Fe2O3/AgAu/polydopamine (PDA) nanospindles with photothermally enhanced antibacterial performance. The AgAu bimetallic nanocrystals sandwiched between the α-Fe2O3 core and the PDA shell are achieved by simultaneous reduction from AgNO3 and HAuCl4 during the oxidative polymerization of dopamine and galvanic replacement reaction between the obtained Ag nanocrystals and Au precursor. The inner nanostructure and atom ratio of AgAu bimetallic nanocrystals can be modulated by varying the experimental parameter, thus further controlling the photothermal activities. In comparison to α-Fe2O3/Au/PDA, Fe2O3/Ag1.7Au0.8/PDA (50 μg/mL) has a better photothermal conversion effect (60.69%). Moreover, the α-Fe2O3/Ag1.7Au0.8/PDA nanospindle exhibits moderate antibacterial activity, which may be derived from Ag+ release. Under application of near-infrared light irradiation, the corn-like α-Fe2O3/Ag1.7Au0.8/PDA nanospindles (50 μg/mL) exhibit a photothermally enhanced sterilization effect against both Escherichia coli and Staphylococcus aureus (99.99%). This “Ag+ release–photothermal” coupling sterilization method provides a simple synergistic antimicrobial therapy strategy, which possesses great promise for future nanomedicine against bacteria in water treatment.
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ANALYTICAL CHEMISTRY
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2023
·
IF 7.4
Ting Li,Wei Lu,Hui Tian,Yu Cao,Qianqian He,Xia Chen,Hailong Wang
The antitumor effect of Pt-based drugs is determined by their binding activity with deoxyribonucleic acid (DNA), and understanding the reaction process in a systematic manner is crucial. However, existing assays used for DNA–Pt research suffer from several issues, such as complicated sample preparation, preamplification, and expensive instruments, which dramatically limit their practical application. In this study, a novel method was presented to investigate the adducts of DNA and oxaliplatin using an α-hemolysin nanopore sensor. This approach allows for real-time monitoring of the DNA–oxaliplatin condensation process through the detection of nanopore events associated with DNA–oxaliplatin adducts. Specifically, type I and II signals exhibiting specific current characteristics were observed during the process. Typical signals with high frequency were obtained by recording the designed DNA sequence. Furthermore, the production of these signals was confirmed to be independent of homologous adducts. This finding suggests that the DNA–oxaliplatin adduct can serve as a potential sensor for detecting oxaliplatin lesions and multiple types of molecules.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Juan Liu,Yanyi Liu,Yuxiang Shen,Xudong Wei,Wenhuan Yuan,Jianying Qi,Jielong Cao,Pengyuan Deng,Haiyao Hu,Liang Wang,Jin Wang
Thallium (Tl) is an untraditional toxic metal. Emerging Tl pollution has received increasing concerns. Despite its extreme biotoxicity, Tl is an irreplaceable element for specific high-tech fields (e.g., superconductors, semiconductors, and optical fibers) due to its peculiar physio-chemical properties. Besides, Tl has been also regarded as critical strategic metal owing to its low abundance and scarcity in the earth’s crust. Herein, a novel composite of α-FeOOH@BC was facilely synthesized via biochar modification with environmentally abundant iron oxides (α-FeOOH) to separate Tl(I) from wastewater. The results showed that overall large distribution coefficient values ( K d > 5000 mL/g) of Tl separation by α-FeOOH@BC in a wide pH range (5.0–11.0) were achieved, suggesting a generally promising Tl separation capacity. Multiple characterizations with Scanning Electron Microscope-Energy Dispersive Spectrometer (SEM-EDS), Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD) and X-ray Photoelectron Spectroscopy (XPS) indicate that the dominant Tl separation mechanisms included electrostatic attraction, ion exchange and complexation. These findings indicate that the α-FeOOH@BC material may have important application in Tl separation from industrial wastewaters, which are usually moderately acidic with pH values ranging from 5.0 to 7.0. This study offers novel perspectives on using environmental abundant iron oxides modified biochar for easy and fast separation of Tl from industrial wastewater. All these findings can facilitate to develop waste-to-resources strategy for recycling Tl in the loop of circular economy and industrial symbiosis.
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JOURNAL OF CHEMICAL PHYSICS
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2022
·Vol. 157
·期 19
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IF 4.304
Xu Tie,Cai Hongkun,Ye Xiaofang,Zhu Yinbin,Ni Jian,Li Juan,Zhang Jianjun
Black-phase formamidinium lead iodide (FAPbI 3 ), with a narrow bandgap and high thermal stability, has emerged as an in-demand material for highly efficient perovskite solar cells (PSCs). In a two-step sequential deposition, the PbI 2 film plays an important role in the formation of a perovskite film with desirable qualities. This paper explores using N-methyl-2-pyrrolidone (NMP), a strong Lewis base, and N,N-dimethylformamide (DMF) as a mixed precursor solvent (DMF/NMP) of PbI 2 and reports on preparing PbI 2 films with a porous morphology by thermal treatment. Porous PbI 2 films ensure the diffusion and sufficient reaction of the formamidinium iodide solution to form a smooth perovskite film. In addition, a dynamic spin coating method is also introduced to improve the uniformity of the perovskite film. Both methods yield a pure α-phase FAPbI 3 film immediately in the unannealed state, which is necessary for the perovskite film to maintain phase stability. Finally, PSCs with a power conversion efficiency of 21.20% (0.13 cm 2 ) are fabricated and optimized. The unencapsulated PSCs retain 90% of the initial efficiency for 1000 hours in dry air and exhibit a good thermal stability when heated to 85 °C.
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Water Science and Engineering
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2022
·
IF 0
Jian-hong Han,Wen-hui Jia,Yi Liu,Wei-da Wang,Lian-ke Zhang,Yu-mei Li,Peng Sun,Jian Fan,Shu-ting Hu
Given the difficulties of degrading benzotriazole (BTA), this study used a one-pot hydrothermal method to prepare α-Fe 2 O 3 /Cu 2 O (FC) composites for photoelectrocatalytic (PEC) degradation of BTA. The characterization of FC structure showed that Cu 2 O in cubic crystals was loaded with circular sheets of Fe 2 O 3 . Owing to this structure, FC showed efficient PEC degradation of BTA when exposed to ultraviolet light. The experimental results demonstrated that FC efficiently degraded BTA. When the PEC degradation continued for 60 min, 100% degradation of BTA was achieved because FC enhanced the photoelectron-hole separation and the separation and transfer of articulated carriers. High performance liquid chromatography–mass spectrometry showed that intermediates formed during the PEC degradation of BTA. Finally, various pathways for degradation of BTA were postulated. This FC-based PEC system provides a harmless and effective method for degradation of BTA.
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Frontiers in Chemistry
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2022
·
IF 5.545
Hu Chun-Mei,Luo Yong-Xin,Wang Wen-Jing,Li Jian-Ping,Li Meng-Yue,Zhang Yu-Fei,Xiao Di,Lu Li,Xiong Zhuang,Feng Na,Li Chen
Coumarin and chalcone, two important kinds of natural product skeletons, both exhibit α-glucosidase inhibitory activity. In this work, coumarin-chalcone derivatives 3 (a∼v) were synthesized, and their α-glucosidase inhibitory activity was screened. The results showed that all synthetic derivatives (IC50: 24.09 ± 2.36 to 125.26 ± 1.18 μM) presented better α-glucosidase inhibitory activity than the parent compounds 3-acetylcoumarin (IC50: 1.5 × 105 μM) and the positive control acarbose (IC50: 259.90 ± 1.06 μM). Among them, compound 3t displayed the highest α-glucosidase inhibitory activity (IC50: 24.09 ± 2.36 μM), which was approximately 10 times stronger than that of acarbose. The kinetic assay of 3t (KI = 18.82 μM, KIS = 59.99 μM) revealed that these compounds inhibited α-glucosidase in a mixed-type manner. Molecular docking was used to simulate the interaction between α-glucosidase and compound 3t.
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高影响因子
NANO
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2022
·
IF 1.438
Lixia Chen,Qianqian Chen,Zhengyan Xue,Shanshan Liu,Shun Wang,Sankui Xu
The design and controllable synthesis of semiconductors at the nanoscale level is a critical strategy for adjusting the performance of catalysts. In this work, size-controlled α -Fe 2 O 3 with nanocubic structure is fabricated through a simple solvothermal method. The growth process of cubic α -Fe 2 O 3 nanocrystals is investigated by time-dependent solvothermal reaction experiments, which displays a typical Oswald ripening mechanism: flower-like nucleation, followed by growing and ripening of nuclei into different morphologies and sizes during the solvothermal process. The UV–vis absorption results revealed that α -Fe 2 O 3 nanocubes present a size-dependent optical property. The α -Fe 2 O 3 -10h with an average particle size of 37 nm exhibits good crystallinity, large specific surface area and high UV–vis light absorption, subsequently resulting in the highest photocatalytic efficiency together with excellent stability.
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MOLECULES
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2022
·Vol. 27
·期 3
·1126
·
IF 4.927
Zhong-Lei Meng,Ru-Si Wen,Xiao-Rui Huang,Rong-Xiu Qin,Yi-Ming Hu,Yong-Hong Zhou
We report the use of five alpha-hydroxy acids (citric, tartaric, mandelic, lactic and glycolic acids) as catalysts in the synthesis of terpineol from alpha-pinene. The study found that the hydration rate of pinene was slow when only catalyzed by alpha-hydroxyl acids. Ternary composite catalysts, composed of AHAs, phosphoric acid, and acetic acid, had a good catalytic performance. The reaction step was hydrolysis of the intermediate terpinyl acetate, which yielded terpineol. The optimal reaction conditions were as follows: alpha-pinene, acetic acid, water, citric acid, and phosphoric acid, at a mass ratio of 1:2.5:1:(0.1–0.05):0.05, a reaction temperature of 70 °C, and a reaction time of 12–15 h. The conversion of alpha-pinene was 96%, the content of alpha-terpineol was 46.9%, and the selectivity of alpha-terpineol was 48.1%. In addition, the catalytic performance of monolayer graphene oxide and its composite catalyst with citric acid was studied, with acetic acid used as an additive.Keywords:pinene;terpineol;alpha-hydroxy acids;phosphoric acid;synthesis
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JOURNAL OF POWER SOURCES
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2021
·
IF 9.127
Chunhua Zhao,Yixuan Wang,Jiexin Zheng,Sijia Xu,Pengfei Rui,Chongjun Zhao
Electric double layer capacitors (EDLC), as the energy storage devices, are generally based on those electrode materials of activated carbon, and biomass are becoming the main source of activated carbon in large scale. However, biomass-derived activated carbon has the disadvantage of low specific surface area (S BET ) due to its big constructing blocks. Herein, gelatinized starch (α-starch) instead of untreated starch is chosen as carbon source, and interconnected porous activated carbon is obtained by tuning the EtOH/H 2 O content of gelatinization solution. Due to its high specific surface area up to 1863 m 2 g −1 , the gelatinized starch-derived activated carbon(SAC) exhibits an improved specific capacitance 335.6 F g −1 at 0.5 A g −1 (305.33 F g −1 at 1A g −1 vs. 103 F g −1 for untreated starch), which also delivers and 245.85 F g −1 at 10 A g −1 and keeps 96% retention of its initial capacitance even after 20, 000 cycles.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2021
·Vol. 36
·期 2
·e6509
·
IF 4.105
Dan Li,Fengmin Ma,Lijun Guo,Jin Huang,Yu Zhang,Feng Li,Cuiqin Li
Late transition metal catalysts with single or multiple active centers have great attention in the ethylene oligomerization application owing to their unique properties. A new polynuclear (α-diimine) nickel(II) complex (PS-Ni complex) bearing the conjugated poly(Schiff-base) ligand (PS-ligand) was synthesized. The structures and the composition of the PS-ligand and the PS-Ni complex were characterized by Fourier transform infrared (FTIR) analysis, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), thermogravimetric (TG) analysis, nuclear magnetic resonance (NMR) and gel permeation chromatography (GPC). The PS-Ni complex was used as precatalyst in ethylene oligomerization combined with methylaluminoxane (MAO) and has good catalytic activity for ethylene oligomerization under mild conditions. Compared with the corresponding mononuclear (α-diimine) nickel(II) complex, the PS-Ni complex showed higher activity of 17.62 × 10 5 g/(mol Ni•h), and the main products were C 4 and C 6 olefins in cyclohexane when the dosage of precatalyst was 2 μmol, the Al/Ni molar ratio was 500, the ethylene pressure was 0.5 MPa, the reaction time was 60 min, and the reaction temperature was 25°C. The main oligomers were α-olefins, and the selectivity was up to 98.68%, due to the more electron-deficient catalytic centers of the conjugated structure of poly(Schiff-base) ligand.
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