SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Xi Li,Wenwen Zhang,Zhenxue Liu,Shiwen Wang,Xiao Zhang,Baokang Xu,Peng Yu,Yanhua Xu,Yongjun Sun
Co-based heterogeneous catalysts exhibit relatively high performance on peroxymonosulfate (PMS) activation for antibiotic pollution control in water. But the aggregation and loss of active components limit their expanded application. In this study, a 3D rose-like MoS 2 was designed and synthesized to anchor Co in its special lamellar structure and achieve its high dispersion. 98.9% of tetracycline (TC) was removed within 60 min with a mineralization rate of 50.5% under neutral condition. The accelerated valence cycle between Co 2+ and Co 3+ was the key to PMS activation and TC degradation. And the lamellar structure of MoS 2 endowed the catalyst with better stability and inhibited Co leaching. The influences of common anions (Cl − , HCO 3 − , H 2 PO 4 − , and SO 4 2− ) and humic acid in aqueous solution on TC degradation were systematically investigated. The catalytic mechanism of PMS activation and the generation of reactive oxygen species (ROS) over Co@MoS 2 were deeply investigated. The reduced biotoxicity of the intermediates indicated the potential of Co@MoS 2 /PMS system for the control of environmental risks caused by TC. This work provided a new insight for the design of metal-doped heterogeneous catalyst with high stability and a new direction for the remediation of antibiotic contamination in water.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Han Wang,Bingzhe Jia,Zhilin Zhao,Chunyan Luo,Xinming Wu
Two-dimensional (2D) materials used in potassium ion batteries (PIBs) have high theoretical capacitance and excellent rate characteristics. However, the origin of low diffusion of potassium ions and poor storage kinetics still remain challenge mainly due to the large size of potassium ions (0.138 nm) and narrow 2D interlayer spacing. Herein, the V 2 CT x -based hybrids including 1T-MoS 2 (1T -MoS 2 @V 2 CT x ) has been successfully constructed by the magneto-hydrothermal method and proved to be an eminent anode, which can make PIBs have high reversible capacity and eminent rate performance at the same time. Moreover, the combination of 2D 1T-MoS 2 and V 2 CT x not only significantly promotes the transfer of interfacial charges as well as accelerates the transmission and diffusion of electrons and K + , but also helps to alleviate the volume changes caused by the insertion/extraction of large-sized K + during the cycle, which makes the electrode exhibit good cycle stability. Density functional theory (DFT) indicates that the synergy effect between 1T-MoS 2 and V 2 CT x has significantly strengthened the potassium affinities and ion diffusion kinetics in the 1T-MoS 2 @V 2 CT x anode by reducing the ion diffusion energy barrier, thereby showing outstanding K + storage performance, especially in 1T-MoS 2 @V 2 CF 2 . As a result, the 1T-MoS 2 @V 2 CT x anode shows a high reversible capacity of 887.3 mA h g −1 at 0.1 A g −1 , eminent rate performance of the capacity maintaining 563.6 mA h g −1 at 2.0 A g −1 and remarkable cycle stability of 601.2/374.7 mA h g −1 with 69.4/56.5% capacity retention after 2000 cycles at 1.0/2.0 A g −1 . This work provides a new way for the exquisite design of 2D composite electrodes with excellent performance in PIBs.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Minjing Xu,Shuaishuai Ma,Jin Li,Meng Yuan,Jiamin Gao,Jinjuan Xue,Mingxin Wang
Oily wastewater causes serious pollution to the environment and has aroused widespread concern. Hereby, a novel, sustainable and hydrophobic 3D polydimethylsiloxane modified MoS 2 @biomass-derived carbon composite (PMC) was fabricated by simple hydrothermal carbonization , self-assembly, freeze-drying, and hydrophobic modification methods based on natural renewable resources. With a water contact angle of 147.2°, the PMC exhibits excellent hydrophobic and oleophilic properties and further processes high adsorption capacity for various organic solvents and oils, and the maximum volume adsorption capacity reached up to 98.5% (v v −1 ). Moreover, the PMC can maintain a high oil-absorption capacity even after 10 cycles, showing good recoverability and reusability. In addition, the as-prepared PMC also can be applied in the removal of water-soluble organic pollutant . Benefiting from its facile fabrication and excellent properties, the developed PMC can be a promising candidate for broad environmental applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yinchen Dai,Wubing Chen,Baochun Guo,Xiao Li,Jibiao Guan,Lina Wang,Ming Zhang
Efficient and inexpensive electrocatalysts play an important role in electrolysis of water and hydrogen evolution reaction . The catalytic activity of electrocatalyst can be improved by adjusting the electronic structure and increasing the active center. In this study, Ni 2 P nanosheets were grown on carbon cloth through straightforward solvothermal, and tiny MoS 2 nanosheets were uniformly covered on Ni 2 P nanosheets by in-situ growth method to form heterogeneous electrocatalyst (Ni 2 P @ MoS 2 /CC). The results show that Ni 2 P @ MoS 2 /CC had more active sites than Ni 2 P/CC and MoS 2 /CC catalysts. In addition, the interface interaction based on heterogeneous structure promotes its charge transfer kinetics. In alkaline electrolyte , Ni 2 P @ MoS 2 /CC electrocatalyst had good HER performance. At a current density of 10 mA cm −2 , the overpotential was 99 mV, and the Tafel slope was 97 mV dec −1 . In addition, the catalyst showed excellent electrochemical stability, with no significant loss of activity after 2000 cyclic voltammetry tests and 50 h i-t tests.
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NANO
·
2022
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IF 1.438
Kaiyue Liang,Mingcai Yin,Yixian Li,Yaoting Fan,Zhongjun Li
CdS and MoS 2 are both promising photocatalytic materials for hydrogen production and lots of MoS 2 /CdS composites have been investigated. However, most of the previous work focused on relatively stable hexagonal CdS; researches on cubic CdS are still rare mainly due to its unstability. Then in this paper, a ternary composite MoS 2 /CN/CdS composed of cubic CdS, MoS 2 and graphitic carbon nitride (g-C 3 N 4 , abbreviated as CN) was prepared by simple in situ precipitation of cubic CdS on MoS 2 /CN at room temperature. Based on a series of characterizations, the photocatalytic hydrogen production performance of MoS 2 /CN/CdS was studied. The results showed that when the amount of MoS 2 /CN was 10 wt.%, the activity reached 1253.2 μ mol h − 1 , about 110 times that of pure CdS. Especially, its stability was investigated in detail by cyclic hydrogen production tests, which indicated that although the activity decreased after the first cycle, it was stable in the following three cycles mainly due to the existence of CN. Namely, a relatively stable and high performance cubic CdS-based ternary composite was achieved. This research can provide some new insights into the design of cubic CdS-based photocatalysts.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Xiaoyue Chen,Songge Zhang,Xiu Qian,Zhangqian Liang,Yanjun Xue,Xiaoli Zhang,Jian Tian,Ye Han,Minhua Shao
Herein, we assemble semi-metallic 1T′ phase MoS 2 on the surface Ti 3 C 2 MXene (1T′-MoS 2 /Ti 3 C 2 composite) by one-step hydrothermal method for nitrogen fixation. 1T′-MoS 2 /Ti 3 C 2 composites present a high ammonia yield rate of 31.96 µg h −1 mg −1 cat. at − 0.95 V vs. RHE and a Faradaic efficiency (FE) of 30.75% at − 0.7 V, which is much better than pure 1T′-MoS 2 and pure Ti 3 C 2 MXenes alone. Furthermore, the 1T′-MoS 2 /Ti 3 C 2 composites exhibit good selectivity and stability with no significant decrease in ammonia yield rate and FE. Density functional theory (DFT) calculations reveal that 1T′-MoS 2 /Ti 3 C 2 composite makes the activation and further reduction of *N 2 more thermodynamically favorable than pure 1T′-MoS 2 . 1 5 N isotopic labeling experiment confirms that nitrogen in produced ammonia originates from N 2 in the electrolyte.
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Journal of Materials Chemistry A
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2022
·Vol. 10
·期 10
·5505-5519
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IF 14.511
Xu Tian,Lijia Yao,Xiuxiu Cui,Rongjun Zhao,Ting Chen,Xuechun Xiao,Yude Wang
Two-dimensional nanomaterials have exhibited considerable potential for gas sensing applications in recent years owing to their unique physical and chemical properties such as a large surface-to-volume ratio, abundant edge sites, versatile surface chemistry, etc. Herein, we demonstrate a two-dimensional Ti3C2TX MXene@TiO2/MoS2 nanocomposite gas sensor for ammonia detection at room temperature. MoS2 nanosheets are grown on an etched Ti3C2TX MXene surface by a hydrothermal method, and rectangular TiO2 particles are derived from Ti3C2TX MXene in the hydrothermal process. Meanwhile, nanocomposites with different Ti3C2TX MXene additions are also designed for gas sensing performance comparison. Such a novel hierarchical structure based gas sensor (MTM-0.2 sensor) exhibits fast response/recovery time and excellent long-term stability to ammonia. Meanwhile, outstanding selectivity to ammonia against triethylamine, trimethylamine, n-butanol, acetone, formaldehyde, and nitrogen dioxide at room temperature is also shown. The sensor shows 1.79-fold and 2.75-fold enhancement in the gas sensing response toward 100 ppm ammonia compared with the pristine Ti3C2TX MXene and MoS2 gas sensors, respectively. And its detection limit for ammonia is 500 ppb. The sensing mechanisms of the Ti3C2TX MXene@TiO2/MoS2 nanocomposites toward ammonia are attributed to the layered nanostructure, p–n heterojunction created at the interface of p-type Ti3C2TX MXene and n-type MoS2. Finally, density-functional theory (DFT) is performed to investigate the adsorption behavior and charge transfer of ammonia molecules on the surface of the nanocomposite. The synthesized Ti3C2TX MXene@TiO2/MoS2 nanocomposite can be regarded as a promising candidate for high-performance ammonia detection at room temperature.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Sanmei Liu,Yanping Yang,Weiming Xiao,Siyao Xia,Caiju Jin,Wen Wang,Shengchen Li,Minli Zhong,Shuhua Wang,Chao Chen
Photocatalytic technology is a unique method of treating energy crisis and environmental concern. Herein, Metal-organic frameworks (MOFs) were employed to prepare a series of visible light responsive MoS 2 /CdS heterojunction photocatalysts by facile low-temperature hydrothermal sulfurization . The structural analysis revealed that the prepared MoS 2 /CdS heterojunction exhibited highly porous structure and the intimate interface was formed between the MoS 2 and CdS. For these structure features, the charge separation and transfer were significantly improved, and the MoS 2 /CdS heterojunction presented efficient photocatalytic activity towards hydrogen evolution and degradation of rhodamine B (RhB) and tetracycline hydrochloride (TC). The highest H 2 evolution rate (3318 μmol h −1 g −1 ) was found at the 5 wt%-MoS 2 /CdS, which were 10 times and 6 times of pristine MoS 2 and CdS, respectively. In particular, the 5 wt%-MoS 2 /CdS can also remove 95% RhB and 90% TC within 40 min. Moreover, the MoS 2 /CdS heterojunction showed good photocatalytic stability for hydrogen evolution and degradation of RhB and TC. Furthermore, the radical trapping experiment revealed that the photogenerated · O 2 − played critical role in RhB degradation and the hole (h + ) and · O 2 − were essential for TC degradation. The work will provide a guidance for rational design and facile preparation of photocatalyst for the visible light-driven hydrogen evolution and elimination of organic pollutants.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Jianqing Ma,Nanzhengfang Jia,Huixia Jin,Sijing Yao,Kefeng Zhang,Yin Kai,Wenliang Wu,Yuezhong Wen
The removal of Cr(VI) from wastewater still faces many challenges. This study reports on chitosan-induced synthesis of few-layer MoS 2 /Fe-doped biochar (Mo-Fe 0.5 -CS) with dual applications in Cr(VI) removal. Using chitosan as a soft template, the MoS 2 in the composite had only about 3 layers with an interlayer spacing greater than that of pure MoS 2 , while Fe was embedded in the carbon skeleton in the form of 6-coordination with O/N. The Mo-Fe 0.5 -CS composite showed high affinity for Cr(VI), with rapid adsorption reaching 100% removal within 15 min for a single solution of Cr(VI). It follows the Langmuir isotherm model with a maximum adsorption capacity of up to 180 mg/g. Furthermore, the Mo-Fe 0.5 -CS composite demonstrated catalytic activity for Fenton-like reactions, which allowed for the simultaneous removal of organic pollutants and Cr(VI). In a mixture solution of Cr(VI) and Acid Red 73 (AR73), the removal efficiencies using Mo-Fe 0.5 -CS and H 2 O 2 in 30 min were 99.7% and 96.6%, respectively. The MoS 2 acted as a cocatalyst to improve the reduction of Fe(III), and the catalysis of Cr(VI) also contributed to the removal of AR73 to a certain extent. Even at pH 10, the system was effective due to the 1 O 2 produced in the reaction and the acidic microenvironment constructed by unsaturated S atoms. These findings provide insights into the effective removal and utilization of Cr(VI) in wastewater treatment .
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FlatChem
·
2021
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IF 5.227
Mingyang Gao,Zhiyong Zhang,Wen Zhang,Xiong Yao,Zhuo Cao,Qinzhe Cao,Huaiyang Zhu,Wu Zhao
A novel and effective preparation technology was developed to prepare ultrathin molybdenum disulfide (MoS 2 ) crystals with a high yield of the top-down exfoliation. Multidimensional carbon nanotubes (MWCNTs) were selected to be an assistant to enhance the effect of the traditional ultrasonic exfoliation efficiency. The rough and messy tubes strengthened the shear force in some parts during the acoustic treatment, which helped to weaken the van der Waals force between the MoS 2 layers. Excitingly, this high-efficiency strategy can increase the dispersion concentration of nanosheets by 15 times compared to the traditional acoustic production, which represented the preparation yield was improved greatly. It is found that the addition of MWCNTs not only facilitated the exfoliation efficiency of bulk material but also indirectly improved the adsorption of malachite green (MG) in wastewater. With a maximum removal capacity of 87.80 mg g −1 , the adsorption ability of the nanotubes-reinforced layered adsorbent was effectively strengthened. In addition, the performance of reproducibility, stability, functioning free radical types, and the adsorption models were systematically studied.
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Materials Today Chemistry
·
2021
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IF 8.301
M. Khaqan Sarwar,Z. Xu,K. Yao,X. Liu,Y. Wang,J. Yang,J. Huang
The development of sodium-ion batteries with a high-power density and long life has attracted considerable interest because of their low cost and potential applications. In this work, we constructed N-doped graphene supported pseudocapacitive material consisting of Ni 3 S 4 grains (50 nm) coated by 3–4 layers of MoS 2 (MoS 2 @Ni 3 S 4 /NG) by facile one-step pyrolysis of nickel phthalocyanine. When the electrode was used as an anode for sodium-ion batteries, a pseudocapacitance-dominated storage mechanism was established, and the extrinsic pseudocapacitance could be further enhanced with the structural evolution of MoS 2 @Ni 3 S 4 during the sodiation/desodiation process, contributing to fast kinetics of Na + storage. The results of impedance analysis indicated that the MoS 2 layers play a vital role in reducing the charge-transfer resistance because the MoS 2 with wider interlayer spacing enables Na + to intercalate with a lower energy barrier compared with intercalating into Ni 3 S 4 directly. As a result, the electrode exhibits a superior cycle life over 1000 cycles, and an excellent rate capacity of 564 mAh g −1 can be achieved at 0.5 A g −1 .
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RSC Advances
·
2021
·Vol. 11
·期 61
·38523-38527
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IF 3.361
Jianfeng Qiu,Jiaqi Pan,Shunhang Wei,Qifeng Liang,Yawei Wang,Rong Wu,Chaorong Li
Normal MoS2 exhibits a low photocatalytic performance for H2 production owing to the deficiency of the active sites and the poor electrical conductance. In this work, MoS2 anchored on the surface of the carbon nanofibers was designed to enhance the activity of the exposed edge and the electrical conductivity at the same time. The oxidation of the surface Mo atoms increases the activity of the exposed edge of the MoS2. The introduction of carbon nanofibers facilitates the effective transportation of the electron–hole pairs by enhancing the electrical conductivity. As a result, the introduction of carbon nanofibers and Mo6+ can facilitate the electron–hole pair separation to enhance the photocatalytic hydrogen evolution reaction (HER) performance (to eight fold more than normal MoS2).
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