HYDROMETALLURGY
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2021
·
IF 4.156
Yubiao Li,Qihang Xiao,Zhiming Li,Andrea R. Gerson
The slow leaching rate of molybdenite (MoS 2 ), due to its inert nature, and low recovery hinders the application of traditional hydrometallurgical processing. This study investigated the effects of grinding speed and time, molar ratio of sodium chlorate (NaClO 3 , oxidant) to MoS 2 , leaching time and temperature on the leaching efficiency of molybdenum (Mo). Grinding at low speeds via mechanical activation decreased particle size. However, at speeds over 450 rpm for 1.0 h, or at lower speeds but with longer time, it triggers a solid-state reaction (mechanochemistry) producing soluble Na 2 Mo 2 O 7 . This may be due to the existence of an energy threshold for the solid-state reaction. The most suitable activating conditions were 600 rpm for 0.5 h, with a molar ratio of NaClO 3 : MoS 2 = 5, leached in 0.1 M NaOH solution for 2.0 h at 348 K, giving rise to a Mo recovery of 74.8%. The initial acid leaching stage of the ground mixture is dominated by the dissolution of Na 2 Mo 2 O 7 , giving rise to elevated Mo recovery. The later stage is controlled by the dissolution of MoS 2 , slowing down the increase in Mo extraction. As compared to alkaline conditions, acidic leaching of MoS 2 ground at low speeds (non solid-state reaction) gives greater Mo recovery, due to the greater activity of NaClO 3 to MoS 2 under acidic conditions. However, the greatest Mo recovery is achieved in alkaline solution for MoS 2 ground at high speed (solid-state reaction) due to the occurrence of mechanochemical reaction.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Hong Li,Xinzhu Wen,Feng Shao,Shiwei Xu,Chao Zhou,Yafei Zhang,Hao Wei,Nantao Hu
Rational materials design is critical to develop advanced electrodes for high-performance sodium-ion battery. In this work, a well-designed structure with interlayer-expanded molybdenum disulfide (MoS 2 ) vertically anchored on graphene substrates (v-MoS 2 /rGO) is achieved by one-pot hydrothermal synthesis . The vertical anchored MoS 2 and high conductivity graphene sheets provide a good path for electrons/ion transfer. More importantly, the direct linkage of O from functional group on graphene oxide (GO) with edge S of MoS 2 (C-O-S) is constructed, which can maintain the stability of the v-MoS 2 /rGO electrode and enhance its electrons transport rate for the high-rate performance and long cycle life. The assembled sodium-ion battery shows high rate performance (129.2 mAh g −1 at 10 A g −1 ) and long cycling stability (251.2 mAh g ‐1 −1 at 2 A g −1 after 1000 cycles with an ultra-low degradation of 10.9 μAh g −1 per cycle). The excellent performance makes the designed structure a fascinating anode for sodium battery.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 23
·10296-10302
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IF 3.591
Guligena Pidamaimaiti,Xiaoyu Huang,Kai Pang,Zhi Su,Fu Wang
Chemodynamic therapy (CDT) with selective therapeutic and minimal side effects has attracted increasing attention in recent years. Nevertheless, the limited H2O2 and acid contents in the tumor microenvironment suppress the efficiency of the Fenton reaction. To overcome these issues, photothermal therapy (PTT) is employed to amplify the CDT effect and realize synergistic PTT/CDT. Herein, MoS2 sheets are functionalized with copper (Cu2O–MoS2), which integrates enhanced CDT and PTT to combat tumor cells. The 808 nm light activated Cu2O–MoS2 nanoplatform appears to be a potential candidate to improve the synergistic effect on the enhanced Fenton-like reaction and photothermal performance.
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CHEMOSPHERE
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2021
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IF 7.086
Qimao Gan,Yangyi Xiao,Chenxing Li,Huan Peng,Tuqiao Zhang,Miaomiao Ye
Currently, seawater desalination based on air-water interface solar heating has triggered significant research interests because it effectively makes use of the solar energy and avoids fossil fuel consumption. However, to prevent the volatile organic compounds (VOCs) from volatilizing with water vapor which later will liquefy and enter the condensed freshwater is still a challenge. In this work, a g-C 3 N 4 /MoS 2 based floating solar still (CM-FSS) combined with thermal/light activation of persulfate (PS) at air-water interface was applied for clean freshwater production for the first time. The CM-FSS was composed of a g-C 3 N 4 /MoS 2 top layer for solar absorption, simultaneous thermal/light activation of PS and then VOCs degradation at air-water interface, a floating layer of expandable polyethylene (EPE) foam for heat isolation, and a transport channel of air-laid paper (ALP) for seawater and PS solution delivery. The water evaporation rate of the CM-FSS was measured at 1.23 kg m −2 h −1 under 1 kW m −2 , which is 4.09 times higher than that of pure water without an evaporator. With the assistance of g-C 3 N 4 /MoS 2 photocatalytic degradation and thermal/light activation of PS at the air-water interface, a high removal efficiency of a selected model VOCs pollutant of nitrobenzene (NB) could reach to 98.2% in condensed freshwater. Finally, when real seawater samples were employed as source water for solar distillation, the typical water-quality indices such as salinity , turbidity , anions, cations and organics of the condensed freshwater were below the limit values of the Standards for Drinking Water Quality in WHO, US EPA and China.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2021
·
IF 5.909
Shan Ni,Liangrong Yang,Hongnan Qu,Xiangyang Zhu,Zihao Xu,Menglei Yuan,Huifang Xing,Li Wang,Jiemiao Yu,Huizhou Liu
Exploring high-efficiency, robust and cost-effective catalysts for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) is greatly desirable. Herein, a series of transition-metal doped MoS 2 (M-MoS 2 , M = Mn, Fe, Co, Ni, Cu, Zn) with expanded interlayer spacing are fabricated by one-step solvothermal strategy. Notably, nickel doped molybdenum disulfide (Ni-MoS 2 ) is found to exhibit prominent catalytic activity with an apparent rate constant (K) of 1.09 min -1 and excellent stability over six continuous runs of recycling experiments. The results demonstrate that the expanded interlayer spacing (0.94 nm) can increase the active sites of reactant absorption, and Ni dopants can lower the energy level (d‐band center) to facilitate the desorption of H. Thus, the catalytic activity of Ni-MoS 2 is enhanced by synergistically structural and energy level modulation. This study offers an effective strategy to design transition metal sulfides with higher catalytic reactivity for the environment-related catalysis processes.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
Xian Fang,Zhongrun Zeng,Qiuju Li,Ying Liu,Wenhai Chu,Thandavarayan Maiyalagan,Shun Mao
The chlorination disinfection of drinking water generates disinfection byproducts (DBPs), which are toxic, carcinogenic, mutagenic, and teratogenic. Recently, trichloroacetamide (TCAM) has been proved to be highly genotoxic and cytotoxic. In this study, a sensitive and selective electrochemical sensor for TCAM detection is reported that is based on the triangular silver nanoprism (AgNPR) and MoS 2 nanosheet (AgNPR@MoS 2 ) heterostructure. The AgNPR can catalyze the dechlorination reaction of TCAM; and the abundant S sites on the edge of MoS 2 nanosheet can absorb H + , thereby accelerating the dechlorination hydrogenation reaction. The AgNPR@MoS 2 heterostructure exhibits a high charge transfer rate, high electrocatalytic activity, and good stability in TCAM detection. The sensor shows two linear sensing ranges of 0.5−10 μM and 10−80 μM, a detection limit of 0.17 μM, and high specificity to coexist DBPs. This study is one of the first reports of electrochemical detection of TCAM, and has successfully demonstrated the significant potential of electrochemical sensor for the real-time analysis and monitoring of trace TCAM in drinking water.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 42
·18264-18273
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IF 3.288
Yunqi Wang,Xu Tang,Zhixiang Liu,Zhi Liu,Yongsheng Yan,Boting Yang,Zhi Zhu
A Z-scheme MoS2/CuO photocatalyst is successfully developed using a hydrothermal and calcination method, which has excellent activity (96%) in the degradation of 2-mercaptobenzothiazole (MBT) under visible light irradiation. The reaction rate constants of MBT degradation on the MoS2/CuO heterojunction are 8 and 6 times higher than those of pure MoS2 and the original CuO, respectively. The as-prepared photocatalyst was characterized using XRD, SEM, XPS and electrochemistry measurement. From the experimental results, the significantly enhanced photocatalytic activity is mainly ascribed to the formation of a Z-scheme heterostructure between MoS2 nanosheets and flower spherical CuO, effectively improving the separation efficiency of photogenerated carriers. What is remarkable is that the Z-scheme electron transfer process leads to a large accumulation of photogenerated electrons and holes, improving the oxidation and reduction properties of CuO and MoS2. Moreover, an intensive study of the mechanism has proved that holes, superoxide radicals and hydroxyl radicals are all active substances in the degradation process. This study opens up a new way to devise novel and highly efficient MoS2-based photocatalysts for the degradation of organic pollutants.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Yujuan Jing,Pingquan Wang,Qiangbin Yang,Qiurun Wang,Yang Bai
Faced with severe corrosion of casing in oil wells, the epoxy coating was applied to prevent corrosion. Based on the mechanism that the filler eliminated the internal stress during the curing process of the coating and prevented the penetration of corrosive medium into the coating, a new filler was successfully prepared by the hydrothermal method . When the molar ratio of the precursor of ZrO 2 to MoS 2 was 1.2:1, MoS 2 was uniformly modified with ZrO 2 through mussel inspired chemistry of dopamine. Introducing fillers into epoxy coatings, specifically, a proper content of 0.8 wt.% filler can greatly improve the mechanical properties and corrosion resistance of the coatings. The coating maintained the excellent corrosion resistance for 16 h under high temperature (108 °C) and high pressure (pressurized with CO 2 gas of 35 MPa), which would provide us a reliable anticorrosive coating for oil wells metal casing.
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高影响因子
RSC Advances
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2020
·Vol. 11
·期 1
·78-86
·
IF 3.119
Jingxuan Zheng,Bo Zhang,Zhao Wang
g-C3N4/MoS2 composites were successfully prepared by an electron-assisted strategy in one step. Dielectric barrier discharge (DBD) plasma as an electron source, which has low bulk temperature and high electron energy, can etch and modify the surface of g-C3N4/MoS2. The abundant N and S vacancies were introduced in the composites by plasma. The dual defects promoted the recombination and formation of heterojunctions of the g-C3N4/MoS2 composite. It exhibited stronger light harvesting ability and higher charge separation efficiency than that of pure g-C3N4 and MoS2. Compared with the sample by traditional calcination method, the plasma-sample showed better performance for degrading rhodamine B (RhB) and methyl orange. RhB is completely degraded within 2 hours on g-C3N4/MoS2 by plasma. A mechanism for the photocatalytic degradation of organic pollutants via the composites was proposed. An electron-assisted strategy provides a green and effective platform to achieve catalysts with improved performance.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 55
·期 31
·15263-15274
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IF 3.553
Wang Jie,Li Zhifeng,Yin Yamin,Liu Haisha,Tang Guohua,Ma Yanxia,Feng Xin,Mei Han,Bi Jinlian,Wang Ke,Chen Zuanguang
Abstract The construction of effective and safe theranostics was very important to realize tumor diagnosis and treatment simultaneously. Photothermal therapy had obtained great attention due to its remarkable capability of both cancer treatment and biosecurity. Molybdenum disulfide (MoS 2 ) nanoflakes have shown excellent photothermal conversion efficiency, which were explored to photothermal therapy. However, MoS 2 nanoflakes would decrease or quench the intensity of fluorescence when the MoS 2 nanoflakes directly incorporated with fluorescence dyes to construct bioimaging theranostic systems. In this work, MoS 2 nanoflakes embedded into MSNs to construct photothermal nanomaterials, which realized the nanoparticle size controllable. Fluorescein isothiocyanate (FITC) conjugated with mesoporous silica nanoparticles via amide bonds for bioimaging. It was more stable than physical absorption. As expected, the as-prepared FITC–MoS 2 MSNs possessed photothermal effect, fluorescence stability and photostability. FITC–MoS 2 MSNs were quickly taken up by HepG2 cells. Meanwhile, the HepG2 cells could be efficiently ablated under the 808 nm near-infrared laser irradiation. These results proved that we successfully constructed multifunctional MSNs for tumor theranostics. It also provided a potentially common nanoplatform for theranostic of biomedical applications. Graphic abstract
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Linghao He,Shunjiang Huang,Yongkang Liu,Minghua Wang,Bingbing Cui,Shide Wu,Jiameng Liu,Zhihong Zhang,Miao Du
In view of the importance of multifunctional catalysts that can drive different electrocatalytic reactions in the same electrolyte solution, we designed and prepared a series of multicomponent nanohybrids composed of Co 9 S 8 and MoS 2 derived from cobalt-doped polyoxometalate (Co-POMs) by one-pot calcination method. The obtained Co 9 S 8 @MoS 2 nanohybrids were composed of Co 9 S 8 , MoS 2 , Co-Mo-S phases and assembled nanosheets, and therefore were explored as trifunctional electrocatalysts for hydrogen evolution reaction, oxygen evolution reaction, and methanol oxidation reaction (MOR) in an alkaline medium. The nanostructure and chemical components of the series of Co 9 S 8 @MoS 2 nanohybrids can be modulated by changing the mole ratios of H 5 Mo 12 O 41 P to Co(NO 3 ) 2 precursor. Compared with the sole component and other reported Co 9 S 8 @MoS 2 nanohybrids, the Co 9 S 8 @MoS 2 nanohybrid prepared from the 1:1 ratio of PMo 12 and Co(NO 3 ) 2 exhibited superior MOR catalysis efficiency (121.4 mA cm −2 ) and an extremely low overpotential (1.49 V) for overall water splitting at a current density of 10 mA cm −2 owning to the effective synergism among Co 9 S 8 , MoS 2 , and Co-Mo-S phase. Overall, this study provides a feasible approach to developing efficient and stable trifunctional bimetal electrocatalysts for clean-energy applications.
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PubMed
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Ying Li,Shijun Zhu,Yao Xu,Riyue Ge,Jiangtao Qu,Mingyuan Zhu,Yang Liu,Julie M. Cairney,Rongkun Zheng,Sean Li,Jiujun Zhang,Wenxian Li
High–performance composite electrocatalysts of g–C 3 N 4 /FeS 2 /MoS 2 for hydrogen evolution reaction (HER) is synthesized by the growth of molybdenum disulfide (MoS 2 ) nanosheets from ferrous disulfide (FeS 2 ) sites supported on graphite–like carbon nitride (g–C 3 N 4 ) substrates. The high conductivity of such composite catalysts is induced by the Fe S bond between FeS 2 and MoS 2 and Fe N bond between FeS 2 and g–C 3 N 4 . These two bonds of Fe S and Fe N can have a bridging function to provide efficient charge transfer channels between g–C 3 N 4 and MoS 2 via chemical bonding rather than physical attachment. Furthermore, the FeS 2 sites can prevent the agglomeration of MoS 2 nanosheets and also seed the MoS 2 to form highly dispersed vertical growth nanosheets with more exposed edging active sites. As a result, this g–C 3 N 4 /FeS 2 /MoS 2 catalyst exhibits both high catalytic HER activity and stability.
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