JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Yufei Ren,Chuantao Wang,Wen Duan,Lihai Zhou,Xiangxiang Pang,Danjun Wang,Yanzhong Zhen,Chunming Yang,Ziwei Gao
Electrocatalytic urea oxidation reaction (UOR) is a prospective method to substitute the slow oxygen evolution reaction (OER) and solve the problem of urea-rich water pollution due to the low thermodynamic voltage, but its complex six-electron oxidation process greatly impedes the overall efficiency of electrolysis. Here, density functional theory (DFT) calculations imply that the metallic Ni 3 S 2 and semiconductive MoS 2 could form Mott-Schottky catalyst because of the suitable band structure . Therefore, we synthesized MoS 2 /Ni 3 S 2 electrocatalyst by a simple hydrothermal method , and studied its UOR and hydrogen evolution reaction (HER) performance. The formed MoS 2 /Ni 3 S 2 Schottky heterojunction is only required 109 and 166 mV to obtain ±10 mA cm −2 for UOR and HER, respectively, showing great bifunctional catalytic activity. Moreover, the full urea electrolysis driven by MoS 2 /Ni 3 S 2 delivers 10 and 100 mA cm −2 at a relatively low potential of 1.44 and 1.59 V. Comprehensive experiments and DFT calculations demonstrate that the MoS 2 /Ni 3 S 2 Schottky heterojunction causes self-driven charge transfer at the interface and forms built-in electric field, which is not only benefit to reduce H* adsorption energy , but also helps to adjust the absorption and directional distribution of urea molecules, thereby promoting the activity of decomposition of water and urea. This research furnishes a tactic to devise more efficient catalysts for H 2 generation and the treatment of urea-rich water pollution.
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ChemistrySelect
·
2022
·Vol. 7
·期 29
·e202202457
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IF 2.307
Guowei Zhi,Lingyun Hao,Wenjing Chen,Qinyang Sheng,Liu Liu,Wei Wang,Hanyu Yao
Graphical In this work, an effective and solar light-driven Z-scheme heterojunction photocatalyst CAS/ZnO was prepared by two steps microwave irradiation method. As the ZnO concentration increased, the absorbance decreased but the specific surface area increased. 3 M displayed the highest degradation rate (100 %), highest rate constant (0.021 min −1 ) and optimum stability. Also, mechanism of the Z-scheme migration of photon-generated carrier and photocatalytic degradation was proposed. This paper provides a new Z-scheme heterojunction CAS/ZnO photocatalyst for the treatment of organic pollutants The heterojunction structure photocatalysts are very promising for photocatalytic degradation dyes to resolve the organic industrial wastewater. In this work, an effective and solar light-driven Z-scheme heterojunction photocatalyst CAS/ZnO was prepared by two steps microwave irradiation method. The ZnO nanosheets were successfully compounded with CAS tetragonal particles aggregate. As the ZnO concentration increased, the absorbance decreased but the specific surface area increased. Rhodamine B (RhB) was tested for photodegradation by photocatalysts under a solar simulation in 120 min, and 3 M displayed the highest degradation rate (100 %), highest rate constant (0.021 min −1 ) and optimum stability. Furthermore, the main reactive species were superoxide radicals (O 2 −. ) and hydroxyl radicals (HO⋅). Also, mechanism of the Z-scheme migration of photon-generated carrier and photocatalytic degradation was proposed. This paper provides a new Z-scheme heterojunction CAS/ZnO photocatalyst for the treatment of organic pollutants.
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Nano Research
·
2022
·Vol. 16
·期 5
·6057-6066
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IF 10.269
Zhao Man,Cheng Xiaoru,Xiao He,Gao Jianru,Xue Shoufeng,Wang Xiaoxia,Wu Haishun,Jia Jianfeng,Yang Nianjun
Highly active, stable, and cut-price (photo-)electrocatalysts are desired to overwhelm high energy barriers for anodic oxygen evolution reaction processes. Herein, a heterostructure of cobalt-iron oxide/black phosphorus nanosheets is in-situ synthesized via a facile and novel three-electrode electrolysis method. Bulky black phosphorus is exfoliated into its nanosheets at the cathode while the CoFe oxide is derived directly from the metal wire anode during the electrolysis process. This heterostructure exhibits excellent electrocatalytic oxygen evolution reaction (OER) performance, and the overpotential at 10 mA·cm −2 is 51 mV lower than that of the commercial RuO 2 catalyst. Its superior OER performance stems from the favorable adsorption behavior and an enlarged electrochemical active surface area of the catalyst. To reveal the origin of excellent OER performance from the point of adsorption strength of OH*, methanol oxidation reaction (MOR) test is applied under the identified OER operating conditions. Further introduction of light illumination enhances the OER activity of this heterostructure. The overpotential drops down to 280 mV, benefiting from pronounced photochemical response of black phosphorus nanosheets and iron oxide inside the heterostructure. This work develops a new electrochemical method to construct high performance and light-sensitive heterostructures from black phosphorus nanosheets for the OER.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Chaopeng Liu,Yanli Mao,Zhongxian Song,Yilong Yang,Xu Yan,Haiyan Kang,Yuzhong Liu,Deming Gu,Xia Zhang,Xiaole Yan
Thiourea-modified Cu 2 O (Cu 2 O-TU) was prepared by a facile route and used for the selective recovery of gold in acidic solution. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis elucidated that Au (III) ions were adsorbed onto the surface of Cu 2 O-TU via the electrostatic attraction of surface protonated amines groups (-NH 3 + ) with AuCl 4 - and the chelating interaction of pyrrole-type nitrogen as well as C S groups in the pH range of 1.0 – 5.0. Subsequently, partial adsorption of Au (III) was reduced to Au (I) and Au (0), while pyridine-type nitrogen was oxidized to -NO, which accelerated the adsorption rate of Au (III). The adsorption equilibrium time was about 2 min and the adsorption capacity was 79.7 mg·g −1 at a pH value of 2.0 in 40 mg·L −1 Au (III) solution. The fitted result of gold adsorption by the Langmuir model was 1529.4 mg·g −1 at 318 K. The experimental data conformed to the pseudo-second-order model, indicating that the adsorption process was chemisorption . After 5 cycles, the capability of adsorption only decreased by 7.43%, which provided a great possibility for its application in solutions. Besides, Cu 2 O-TU showed specific and selective adsorption ability for Au (III) in the outdoor environment .
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REACTIVE & FUNCTIONAL POLYMERS
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2022
·
IF 4.966
Qian Liu,Zijie Fan,Xibin Yi,Shiwei Chen,Bing Li,Weiyue Luo
The polyimide is a promising semiconductor photocatalyst . However, its photocatalytic activity is poor because of its small specific surface area, low visible light absorption and easy recombination of photoexcited electron and hole. Herein, porous polyimide/carbon quantum dots/ZnS quantum dots material aerogel with excellent photocatalytic performance is prepared via supercritical fluid drying technology. The material aerogel has large surface area and the structure is porous network. The carbon quantum dots increase the visible light absorption of the polyimide aerogel . The ZnS quantum dots change the VB edge, CB edge and band gap of the polyimide aerogel. Both carbon quantum dots and ZnS quantum dots could improve the charge transfer and facilitate the separation of photoexcited electron and hole. The visible-light photocatalytic performance over oxytetracycline of porous polyimide/carbon quantum dots/ZnS quantum dots material aerogel is increased largely compared to pure polyimide aerogel. The photocatalytic degradation mechanism of the polyimide material aerogel is proposed. ·O 2 − and h + play the key role in the photocatalytic degradation. This work supplies an effective method to prepare visible-light photocatalytic materials.
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Biomaterials Science
·
2022
·Vol. 10
·期 15
·4243-4256
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IF 7.59
Rames Kaewmanee,Fan Wang,Yongkang Pan,Shiqi Mei,Jirut Meesane,Fengqian Li,Zhaoying Wu,Jie Wei
Implanted materials with both osteogenic and antibacterial functions are promising for facilitating osteointegration and preventing infection for orthopedic applications. In this work, we synthesized flower-like molybdenum disulfide (fMD) submicro-spheres containing nanosheets, which were incorporated onto the microporous surface of polyimide (PI) via concentrated sulfuric acid, suspending fMD contents of 5 wt% (SPM1) and 10 wt% (SPM2). Compared with sulfonated polyimide (SPM0), both SPM1 and SPM2 with microporous surfaces containing fMD exhibited nano-submicro-microporous surfaces, which improved the surface roughness, wettability, and surface energy. Due to there being more fMD submicro-spheres on the microporous surface, SPM2 revealed a better antibacterial effect than SPM1. In addition, compared with SPM1 and SPM0, SPM2 with more fMD significantly promoted rat bone marrow-derived stromal cell response in vitro. Moreover, SPM2 remarkably enhanced new bone formation and osteointegration in vivo. In summary, the combination of fMD with the microporous surface of SPM2 resulted in a nano-submicro-microporous surface with optimized surface performance, which possessed not only osteogenic bioactivity but also an antibacterial effect. As a bone implant, SPM2 with osteogenic and antibacterial functions may have enormous potential as a bone tissue substitute.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Hu Zhou,Shuai Wang,Jinyue Jiang,Li Shao,Dan Li,Jiren Yuan,Feigao Xu
Magnetic Fe 3 S 4 /MoS 2 composites with a visible light response were prepared, and their degradation activity was tested using tetracycline hydrochloride (TCH) as a simulated pollutant. The mass ratios of Fe 3 S 4 and MoS 2 , pH change, temperature, H 2 O 2 concentration, and catalyst addition were investigated to determine the mechanism of TCH degradation. The results show that the removal rate of TCH by the Fe 3 S 4 /MoS 2 composites is much higher than that of the pure Fe 3 S 4 or MoS 2 under pH values ranging from 1.2 to 13.2. The removal rate of TCH by Fe 3 S 4 /MoS 2 was 376.37 and 5.45 times higher than that of pure Fe 3 S 4 and MoS 2 when the mass ratio of Fe 3 S 4 and MoS 2 was 1:1 at pH 7.2. The main free radicals and metal leaching changes are analyzed. The removal mechanism of TCH was proposed by the free radical scavenger test and the metal leaching test. The mechanism proposed in this paper shows that the high catalytic activity of Fe 3 S 4 /MoS 2 composite is due to the acidic microenvironment near the surface of the composite, which reduces the production of ferric hydroxide sludge.
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Advanced Materials Interfaces
·
2022
·Vol. 9
·期 26
·2201049
·
IF 6.389
Yun Zhao,Qianqian Bai,Liqiang Chai,Xiaofei Dong,Jiangtao Chen,Jianbiao Chen,Yan Li,Xiuxun Han
Aiming at the current bottleneck of Cu 2 ZnSn(S,Se) 4 (CZTSSe) thin film solar cells, an experimental analysis of the performance and loss mechanism of CZTSSe thin film solar cells upon proton radiation exposure is presented. In order to deduce the important cell parameters, the environment of the cells is simulated by subjecting the devices to 200 keV proton irradiation with fluences from 1 × 10 10 to 1 × 10 17 cm -2 . It is found that the damage constants are sensitive to the elemental diffusion at heterojunction and Na redistribution in device. The incidence of the proton can lead to bandgap, tails fluctuations, and Urbach energy changes in the cells those directly impact defects and structural disorder in CZTSSe material thereby the device performance. The time-resolved photoluminescence results show that the carrier lifetime is also very sensitive to the distribution of interface elements, especially Na, Cd, and S. These findings may provide new ideas for solving the V OC deficit of CZTSSe solar cells. From this work, it can be also suggested that the CZTSSe thin film solar cells are robust to proton irradiation and have the potential for future space applications.
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Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 9
·1431-1444
·
IF 11.534
Jin Sen,Jing Huijuan,Wang Libo,Hu Qianku,Zhou Aiguo
Nowadays, photocatalytic technologies are regarded as promising strategies to solve energy problems, and various photocatalysts have been synthesized and explored. In this paper, a novel CdS/MoO 2 @Mo 2 C-MXene photocatalyst for H 2 production was constructed by a two-step hydrothermal method, where MoO 2 @Mo 2 C-MXene acted as a binary co-catalyst. In the first hydrothermal step, MoO 2 crystals with an egged shape grew on the surface of two-dimensional (2D) Mo 2 C MXene via an oxidation process in HCl aqueous solution. In the second hydrothermal step, CdS nanorods were uniformly assembled on the surface of MoO 2 @Mo 2 C-MXene in ethylenediamine with an inorganic cadmium source and organic sulfur source. The CdS/MoO 2 @Mo 2 C-MXene composite with MoO 2 @Mo 2 C-MXene of 5 wt% exhibits an ultrahigh visible-light photocatalytic H 2 production activity of 22,672 µmol/(g·h), which is ∼21% higher than that of CdS/Mo 2 C-MXene. In the CdS/MoO 2 @Mo 2 C-MXene composite, the MoO 2 with metallic nature separates CdS and Mo 2 C MXene, which acts as an electron-transport bridge between CdS and Mo 2 C MXene to accelerate the photoinduced electron transferring. Moreover, the energy band structure of CdS was changed by MoO 2 @Mo 2 C-MXene to suppress the recombination of photogenerated carriers. This novel compound delivers upgraded photocatalytic H 2 evolution performance and a new pathway of preparing the low-cost photocatalyst to solve energy problems in the future.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Tianyu Zhao,Deyang Li,Yiyan Zhang,Guanying Chen
Lead halide perovskites are promising for photocatalysis due to their excellent optoelectronic properties, high extinction coefficients, and long electron-hole diffusion lengths. However, severe recombination of photogenerated carriers limits their photocatalytic activity. Herein, we describe a perovskite-based step-scheme (S-scheme) heterojunction by interfacing CsPbBr 3 perovskite nanocrystals with sulfur (S) doped graphitic carbon nitride (g-C 3 N 4 ) ultrathin nanosheet. The formation of S-scheme heterojunction was substantiated by in-situ x-ray photoelectron spectra, showing a negative shift for Cs 1s, Pb 4f, and Br 3d binding energy in CsPbBr 3 , while a positive shift for C 1s, N 1s, and S 2p in S-doped g-C 3 N 4 upon light irradiation. Moreover, alignment of Fermi levels in both semiconductors results in constructing a built-in electric field in the heterojunction, which enhances S-scheme electron transfer from g-C 3 N 4 to CsPbBr 3 , favorable for electron (CsPbBr 3 ) and hole (g-C 3 N 4 ) separation for enhanced carbon dioxide (CO 2 ) photoreduction. Indeed, compared with CsPbBr 3 , the developed CsPbBr 3 /S doped g-C 3 N 4 composite showed a ∼16-fold improvement in the photocatalytic CO 2 reduction rate (∼83.6 μmol h −1 g −1 ), thus holding great potential for photocatalysis applications in environmental and energy fields.
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JOURNAL OF SEPARATION SCIENCE
·
2022
·Vol. 45
·期 18
·3604-3613
·
IF 3.614
Xiaofei Ma,Bohua Chen,Liangliang Cai
Taking advantage of chiral ionic liquids, this study deals with the improvement of the enantioseparation performance of a traditional chiral selector (maltodextrin) in capillary electrophoresis. Herein, two polyhydroxy compound-based chiral ionic liquids, namely tetramethylammonium-D-gluconic acid and tetramethylammonium-shikimic acid were designed and utilized as additives for chiral separation for the first time. The synergistic systems provided much better enantioseparations of twelve model drugs compared to the single maltodextrin system. These model analytes contained analgesics, antidepressants, antiallergic drugs, antifungal drugs, antihypertensive drugs, and antiparkinsonian drugs. After optimizing the separation conditions, the chiral recognition mechanism was probed by means of ultraviolet spectroscopy, nuclear magnetic resonance, and molecular modeling. The results of spectroscopic and computational analyses were in good consistency with enantioseparation outcomes. Finally, the proposed method was successfully used for the determination of the enantiomeric purity of duloxetine hydrochloride.
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Micromachines
·
2022
·Vol. 13
·期 8
·1292
·
IF 3.523
Yuan Ji,Zhenlong Li,Yundan Liu,Xianghua Wu,Long Ren
Co-based compounds have attracted much attention due to their competitive catalytic activities. To enhance their intrinsic electrocatalytic activity, morphology engineering is one of the effective strategies. Hollow structures have fascinating properties due to their low density and high loading capacity. In this work, we introduce a Ga-based liquid alloy as a reactive template for the synthesis of varying Co-based hollow nanoparticles. The fluidity character of the Ga-based liquid alloy facilitates the large-scale production of nanoparticles via a top-down shearing process. The pre-installed active species (here is Zn) in the liquid alloy serve as a sacrificial source to quantitatively reduce Co2+ions and form Co-based compounds. Well-structured Ga/CoOOH core-shell nanospheres are thus successfully prepared, and more varied Co-based hollow nanoparticles can be obtained by post-treatment and reaction. Hollow structures can offer enhanced interfacial area and increased active sites, benefiting the catalytic performance. Among the prepared Co-based catalysts, CoSe2hollow nanoparticles exhibited the best oxygen evolution reaction (OER) activity with an overpotential of 340 mV at the current density of 10 mA/cm2. This work provides a novel strategy for the rational design and simple preparation of hollow nanoparticles.Keywords:liquid metal;hollow structure;transition-metal compounds;electrocatalyst
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