Materials Advances
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2022
·Vol. 3
·期 23
·8677-8683
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IF 0
Jiameng Wang,Wuyi Zhang,Lanlan Chen,Jie Huang,Xiaojia Shi,Dong Han,Jia Wen,Hongyuan Yan
A kind of nanocomposite consisting of molybdenum disulfide (MoS2) and gold nanoparticles (AuNPs) was prepared by a simple self-reduction method. Transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy were used to characterize the MoS2@AuNP nanocomposites. The as-prepared MoS2@AuNP nanocomposites were further used to modify a glassy carbon electrode to construct an electrochemical glucose biosensor. The electrochemical performance of the biosensor was evaluated using cyclic voltammetry, electrochemical impedance spectroscopy and differential pulse voltammetry. And it was found that the biosensor had prominent electrochemistry activity towards glucose. Under the optimized experimental conditions, a linear relationship in the range of 1–100 μM was detected between the difference of cathodic reduction current and the concentration of glucose, and the detection limit was 0.14 μM. The results showed that the biosensor exhibited good specificity, repeatability and reproducibility. In addition, the biosensor was also successfully applied for the determination of glucose concentrations in milk samples.
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NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 44
·21078-21084
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IF 3.925
Xing-Liang Yin,Lei-Lei Li,Yan-Lan Wang
An efficient and stable CdS@MoS2 core@shell heterostructure was prepared by using a facile solvothermal approach. The MoS2@CdS heterostructure reveals efficient charge separation, giving rise to excellent performance on H2 generation from photocatalytic lactic acid decomposition. Thanks to the MoS2 shell protection, CdS corrosion was significantly prohibited, thus resulting in the long-term photocatalytic stability of the CdS@MoS2 heterostructure. The corresponding charge transfer properties and catalytic mechanism have been analyzed and discussed in detail. The present study provides a novel insight into the design of high performance and cost-effective photocatalysts.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 20
·16077-16098
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IF 2.779
Chen Keke,Feng Hange,Li Lingwei,Luo Menghao,Xue Shaolin,Sang Jingxin
The excellent photoresponse of semiconductors enables them as a promising photocatalyst for photocatalytic degradation of organic pollutants and antibiotics, but their practical applications are limited by photogenerated carrier recombination, instability, and fixed energy band positions. Herein, we designed and synthesized a dual Z-scheme flower-like spherical Ag 3 PO 4 /MoS 2 /g-C 3 N 4 (AMN) photocatalyst loaded with different mass of g-C 3 N 4 (3, 5 and 7 mg). Under visible light irradiation, MoS 2 enhanced the light absorption range of AMN composite. The holes concentrated in the valence band of Ag 3 PO 4 provide strong oxidation capacity, and the electrons retained in conduction band of g-C 3 N 4 provide strong reduction ability in the photocatalytic system. It is helpful to improve the separation efficiency of photogenerated carriers and enhance the photocatalytic activity of AMN composite. The AMN photocatalyst loaded with 5 mg g-C 3 N 4 (AMN-5) has the optimal photocatalytic activity. The photocatalytic degradation efficiency of the photocatalyst for methylene blue (MB) within 24 min is 3.98, 1.85, and 1.17 times that of g-C 3 N 4 , Ag 3 PO 4 , and Ag 3 PO 4 /MoS 2 , respectively. After three cycles, the degradation efficiency of AMN-5 for MB decreased from 99.44% to 90%, about 3.79 times of Ag 3 PO 4 (23.77%). In addition, the optimal AMN-5 photocatalyst also has excellent photocatalytic degradation efficiency for Rhodamine B (RhB) and tetracycline (TC). This design and concept provide a promising insight for the photocatalytic degradation of pollutants.
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Materials Today Chemistry
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2022
·
IF 7.613
S. Yang,Y. Cheng,T. E,Y. Wang,L. Liu,Y. Li,D. Wang,J. Qian
The inert substrate surface of MoS 2 leads to unsatisfactory adsorption performance. Herein, an inert substrate surface activation strategy is proposed, and the resulted MoS 2 /montmorillonite (MMT) prepared via the hydrothermal method is immersed with NaF (F–Mt). The intercalation of Na + contributes to inducing the transformation of MoS 2 from 2H phase to 1 T phase, thereby providing a large number of S vacancies and exposing available Mo 4+ . Meanwhile, the surface of MMT is activated due to the fact that partially [Si 4 O 10 ] 4- are etched by F - , which facilitates forming Si–O–Mo bonds to promote the charge transfer. The improved charge transfer rate can make S 2- in MoS 2 accumulate more negative charges, greatly enhancing the adsorption capacity to Pb 2+ . Moreover, the natural negative potential on the surface of MMT solves the problem of easy stacking for nanosheets , improving the availability of active sites on the edge, which are also benefit from the etching effect on MoS 2 nanosheets with NaF. The maximum adsorption capacity achieves 97.09 mg/g. Additionally, density functional theory (DFT) calculations confirm the resulted S vacancies in MoS 2 are in favor of removing Pb 2+ , which is also contributed by the electrostatic and chemical adsorption with MMT. Therefore, it suggests that F–Mt is an excellent adsorbent for Pb 2+ .
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ANALYTICA CHIMICA ACTA
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2022
·
IF 6.911
Yujie Ma,Mingshi Deng,Xuefeng Wang,Xinghua Gao,Haixiang Song,Yongheng Zhu,Lingyan Feng,Yuan Zhang
A type I nitroreductase-mimicking nanocatalyst based on 2H–MoS 2 /Co 3 O 4 nanohybrids for trace nitroaromatic compounds detection is reported in this work. For the preparation of nanocatalyst, ultrathin Co 3 O 4 nanoflakes array was in-situ grown onto 2H–MoS 2 nanosheets forming three-dimensional (3D) nanohybrid with large specific surface area as well as abundant active sites. The as-prepared nanocatalyst shows a specific affinity as well as high catalytic activity towards nitroaromatic compounds. Given the favorable nitroreductase-mimicking catalytic activity of 2H–MoS 2 /Co 3 O 4 nanohybrid, a sensitive and efficient electrochemical microsensor has been constructed for the detection of 2, 4, 6-trinitrotoluene (TNT). Under optimized conditions, the microsensor displayed sensitive response from μM to pM levels with a limit of detection (LOD) of 1 pM. We further employed photoelectron spectroscopy (XPS) analysis and high-performance liquid chromatography tandem mass spectrometry (HPLC-MS/MS) method to identify the nitroreductase-mimicking mechanism of 2H–MoS 2 /Co 3 O 4 nanohybrids towards 2, 4, 6- TNT. It was found that the abundant oxygen vacancies in ultrathin Co 3 O 4 nanoflakes played an essential role in determining its catalytic performance. Moreover, the developed MoS 2 /Co 3 O 4 nanozyme has a lower Michaelis-Menten constant (k m ) than that of nature nitroreductase demonstrating a good enzymatic affinity towards its substrates, and further generating a high catalytic activity. This research not only proposed a new type of nanozyme, but also developed a portable electrochemical microsensor for the detection of 2, 4, 6-TNT.
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PubMed
高影响因子
LANGMUIR
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2022
·
IF 4.331
Chang Liu,Bingqiao Yang,Feifei Jia,Shaoxian Song
Gold recovery from thiosulfate leaching solution Au(S2O3)23– is regarded as a tough task because of the low efficiency and complex procedure in current technology, which hindered the industrial application of this eco-friendly technique. In this work, a MoS2@activated alumina bead composite (MoS2@AA) was constructed through a simple hydrothermal anchoring method and served as a catalyst to recover gold from Au(S2O3)23– solution for the first time. The microstructure and chemical component of MoS2@AA were systematically analyzed. In addition, batch experiments were carried out to explore the recovery behavior of Au(S2O3)23– (concentration: 10 to 200 ppm). Ascribing to the extraordinary optical property of MoS2@AA, Au(S2O3)23– could be directly reduced to Au0 by photogenerated electrons and then form a two-phase interface of gold/MoS2@AA. As a result, the recovery of Au(S2O3)23– can reach up to 98% on MoS2@AA, which was much higher than traditional methods. More importantly, the reduced Au0 could be desorbed from MoS2@AA through a supersonic method, achieving one-step Au0 recovery from Au(S2O3)23–. This novel strategy used in this research has great significance to the development of Au(S2O3)23– recovery in the future.
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Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Hongshan Wang,Zhenzhen He,Qiangbin Yang,Guangyong Zeng,Zhaomei Yang,Shengyan Pu
MXene nanosheets were functionalized by introducing sodium lignosulfonate (LS) containing abundant hydrophilic groups (sulfonic acid groups and phenolic hydroxyl groups), along with the intercalation of MoS 2 nanosheets between the functionalized MXene layers. A pressure-assisted self-assembly was utilized for the fabrication of a two-dimensional (2D) MXene membrane with high water permeation and excellent dye separation characteristics. The MoS 2 @LS-MXene composite membrane has excellent pure water flux (188.1 L·m -2 ·h -1 ), which is 85% higher than that of the unfunctionalized MXene membrane, and has a good rejection effect on dye molecules (93% for Congo red (CR), and 99% for Rhodamine B (RhB)). The appropriate interlayer spacing and negative surface charge resulted low rejection of salts (4.2% of NaCl, 4.6% of Na 2 SO 4 ) in dye-salt hybrid system, consequently leading to their mutual separation. The composite membrane also exhibits excellent stability and anti-fouling ability. This study provides a simple and novel design idea for the preparation of high-performance 2D MXene membrane.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Yeyuan Feng,Xiaorong Meng,Zhenpeng Wu,Jin Chen,Chi Sun,Shanshan Huo
Heavy metal pollution poses a serious threat to human health. Positively charged nanofiltration membranes show excellent application prospects in the field of heavy metal removal due to the combined effect of electrostatic repulsion and size sieving. Here, molybdenum disulfide (MoS 2 ) nanosheets were dispersed in aqueous solution polyethyleneimine (PEI) by virtue of the adhesion effect of tannic acid (TA). Positively charged polyurea NF membranes (TSPU) were prepared by interfacial polymerization of aqueous phase PEI/TA-MoS 2 and organic phase 2,4-toluene diisocyanate (TDI). The surface of the optimized membrane TSPU-0.015 showed better hydrophilicity, the water contact angle was 74.53°, and the functional layer thickness of TSPU-0.015 was 114.8 nm. TSPU-0.015 interface was positively charged (IEP TSPU - 0.015 = 5.62), so the rejection of magnesium salts is significantly higher than that of sodium salts. It shows a retention performance of more than 99% for high-valent heavy metal ions such as Fe 3+ and Cu 2+ , and the retention for Cd 2+ is as high as 92.53%. The permeation flux of TSPU-0.015 is 2.88 times higher than that of undoped MoS 2 (TSPU-0), and the flux to MgSO 4 solution reaches 34.5 L/m 2 ·h (6 bar, R (MgSO4) = 93.18%). TSPU has long-term stable operation and excellent anti-pollution properties, showing wide application potential in the fields of inorganic salt separation and heavy metal pollution.
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Applied Materials Today
·
2022
·
IF 8.663
Enhui Ma,Guolong Sun,Fanglin Duan,Hongguang Wang,Hong Wang
A direct Z-scheme heterojunction coupling hierarchical nanosheet MoS 2 nanotubes with CuInS 2 quantum dots was successfully prepared to fabricate MoS 2 NTs/CuInS 2 QDs photoanodes for enhanced photoelectrocatalytic (PEC) activity. The MoS 2 NTs with stacked nanosheets and tubular structure have high surface area and abundant basal edges, which can create more active reaction sites. Simultaneously, the continuous and broad photo-absorption range of MoS 2 NTs improved the utilization of visible-light and increased the separation efficiency of photo-induced electron-hole pairs. The integration of MoS 2 NTs with CuInS 2 QDs onto Cu foil yielded direct Z-scheme heterojunction photoanode. The formation of Z-scheme heterojunction inhibited the recombination of photo-induced electron-hole pairs and produced more active electrons and holes to facilitate the generation of highly active species. Under visible light illumination, the prepared MoS 2 NTs/CuInS 2 QDs photoanode showed superior PEC activity by applying a suitable bias voltage. In PEC process, the generated holes, hydroxyl radicals and superoxide radicals with strong oxidative were employed to achieve highly efficient degradation of tetracycline. The prepared photoanode exhibited high stability, reusability, and broad application potential in PEC degradation of organic pollutants. Moreover, a possible mechanism of the transfer pathway of photo-induced electron-hole pairs on the MoS 2 NTs/CuInS 2 QDs photoanode was proposed based on a direct Z-scheme heterojunction.
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CRYSTAL RESEARCH AND TECHNOLOGY
·
2022
·Vol. 57
·期 8
·2100200
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IF 1.599
Mingyang Gao,Qinzhe Cao,Ao Yang,Qianyi Gao,Wen Zhang,Mingjia Zhang,Zhiyong Zhang
Numerous ingenious top-down methods have opened a new door to the extensive research of 2D crystals. In this paper, a novel “differential-temperature exfoliation technology” is proposed to synthesize 2D few-layer MoS 2 . Several characterizations are conducted for discussion. The spectroscopic, optical, and purification capacity of the as-exfoliated layered structures is further studied systematically. This research provides insights into the novel top-down production and the related potential for environmental protection of few-layer MoS 2 .
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 24
·11934-11945
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IF 3.925
Wenxuan Ma,Chenggong Zhang,Shuhua Hao,Yupeng Xing,Gang Zhao,Shipeng Qiu,Changwen Zhang,Xiaoke Wang
Developing semiconductor catalysts with high catalytic activity and good economic benefits is an important and challenging task in the field of photocatalysis. In this study, CdS nanosheets with a three-dimensional hollow structure were grown on MoS2 nanosheets by a hydrothermal method. The hydrogen production of the CdS@MoS2-25 wt% composites is 8.2 mmol in 3 h, which is 43.71 times that of pure CdS and 4.7 times that of Pt. Density functional theory (DFT) was used to further study the band structure of the composites. The experimental and calculation results show that the addition of co-catalyst MoS2 reduces the band gap of CdS and accelerates the transfer rate of photogenerated electrons. The construction of a n–n homogeneous structure reduces the interface transmission resistance of the carriers, and the photocatalytic performance of the composite material has been significantly improved. Therefore, the composite material is an excellent semiconductor photocatalyst that can replace precious metals in the reaction. In addition, after adding the promoter MoS2 to participate in the photocatalytic reaction for 12 h, the composite material still maintains high photocatalytic activity, and the recombination rate of photogenerated carriers is greatly reduced, which proves that the photocatalyst has good stability.
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CATALYSIS TODAY
·
2022
·
IF 6.562
Yiming Ma,Yushuai Sang,Kai Wu,Qingfeng Liu,Hong Chen,Yongdan Li
Low selectivity and complex product distribution are the main challenges for the utilization of lignin. Herein, the selective production of 2-(tert-butyl)-3-methylphenol (TBC), an antioxidant in the polymer industry, from depolymerization of enzymatic hydrolysis lignin (EHL) on a hydrothermally synthesized MoS 2 catalyst is studied. The total aromatic monomer yield is 124.1 mg/g EHL and the selectivity of TBC is up to 40.3 wt% in methanol at 280 °C under 2 MPa H 2 for 6 h. The FT-IR analysis of products reveals that MoS 2 has a high activity for demethylation, dehydroxylation and alkylation, and the dimer conversions reveal that C-O and C-C bonds in EHL are broken with MoS 2 . The guaiacol and its derivants are identified as the intermediate for formation of TBC in EHL depolymerization according to the effect of time on product distribution and monomer conversion.
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