CATALYSIS TODAY
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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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ACS ES&T Water
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2022
·
IF 0
Yibing Sun,Hongchao Li,Shengli Zhang,Ming Hua,Jieshu Qian,Bingcai Pan
Heterogeneous peroxymonosulfate (PMS)-based advanced oxidation processes (AOPs) are under extensive investigation for their great potential in water remediation. The understanding of the PMS activation mechanism is crucial but still debatable. Here, we describe a thorough investigation of the mechanism involved in PMS activation by using molybdenum disulfide (MoS2) as a catalyst. This MoS2/PMS system exhibited intriguing target-dependent reactivity. Further comprehensive experimental results excluded the major contributions of various possible species, including HO•, SO4•–, O2•–, 1O2, homogeneous Mo(VI), and heterogeneous Mo(VI). We then proposed a surface ≡Mo–OOSO3– complex as the major reactive species, while SO4•– derived from the decomposition of ≡Mo–OOSO3– acted as the secondary reactive species for pollutant removal. This complex could oxidize pollutants through the oxygen-atom-transfer mechanism and perform both nucleophilic and electrophilic attacks. This work provides novel perspectives for the mechanistic understanding of heterogeneous PMS-based AOPs for water remediation.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Jianfeng Wang,Jun Li
The traditional PP separator is failed to inhibit the polysulfide shuttle effect for the lithium-sulfur ctteries. Besides, it has poor safety porblem when used at high temperatures. Therefore, it is urgent to develop new modified separator to repalce the traditional separator. To deal with these problems, layered hierarchical C@MoS 2 spheres are prepared and modified the traditional separator. Due to the presence of the C@MoS 2 modified separator, the Li-S batteries with C@MoS 2 separator display high specific capacity and superior cycling stability even at high rate of 2C. The high electrochemical performance is attributed to efficient inhibition of shuttle effect by the adsorption and catalytic conversion of polysulfide on the C@MoS 2 separator. This work has a certain reference value for the future large-scale application of lithium-sulfur battery.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Long Chen,Junmei Liang,Qicheng Zhang,Xuewen Hu,Wenchao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
Developing advanced noble-metal-free electrocatalysts for the hydrogen evolution reaction (HER) is still a great challenge. Herein, a novel HER catalyst with quasi zero-dimensional (0D) MoS 2 quantum dots (QDs) supported on two-dimensional (2D) Ti 3 C 2 T x MXene nanosheets is facilely synthesized. The MoS 2 QDs/Ti 3 C 2 T x nanohybrid retains the unique layer structure, and the MoS 2 QDs are in situ formed and distributed uniformly. The obtained MoS 2 QDs/Ti 3 C 2 T x catalyst exhibits superior electrocatalytic activity due to its excellent conductivity, abundant of active sites exposed and a high percentage of 1T metallic phase (∼76%) of MoS 2 QDs. Remarkably, an early HER overpotential of 220 mV at 10 mA cm −2 and a small Tafel slope of 72 mV dec −1 of MoS 2 QDs/Ti 3 C 2 T x are achieved in 0.5 M H 2 SO 4 solution. In addition, the exchange current density of MoS 2 QDs/Ti 3 C 2 T x is ∼5 times larger compared with pure MoS 2 , thus demonstrating an accelerated charge transfer during the electrocatalytic process.
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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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Small
·
2022
·Vol. 18
·期 16
·2105129
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IF 15.153
Songlong Jiao,Mengshu Kong,Zhenpeng Hu,Shiming Zhou,Xiaoxuan Xu,Lei Liu
Single-atom catalysts (SACs) can achieve excellent catalytic efficiency at ultralow catalyst consumptions. Herein, platinum (Pt) atoms are fixed on the wall of atomic layer deposition (ALD)-made molybdenum disulfide nanotube arrays (MoS 2 -NTA) for efficient hydrogen evolution reaction (HER). More concretely, MoS 2 -NTA with different nanotube diameters and wall thicknesses are fabricated by a sacrificial strategy of anodic aluminum oxide (AAO) template via ALD; then Pt atoms are fixed on the wall of Ti 3 C 2 -supported MoS 2 -NTA as a catalytic system. The MoS 2 -NTA/Ti 3 C 2 decorated with 0.13 wt.% of Pt results in a low overpotential of 32 mV to deliver a current density of 10 mA cm –2 , which is superior to 20 wt.% commercial Pt/C (41 mV). Ordered MoS 2 -NTA instead of 2D MoS 2 prevents Pt atoms from aggregating and then exerts catalytic activities. The density functional theory calculations suggest that the Pt atoms are more likely to occupy the sites on the tubular MoS 2 than the planar MoS 2 , and the Pt atoms accumulated at the Mo site of MoS 2 -NT have a moderate Gibbs free energy (close to zero).
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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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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Tao Wu,Xingwen Chen,Hongguo Zhang,Meng Zhao,Lei Huang,Jia Yan,Minhua Su,Xianjie Liu
Capacitive deionization has been considered as a promising wastewater treatment technology because of its low-cost and highly efficient. Herein, we prepared hollow bowl-type carbon materials loaded with molybdenum sulfide (HBC-MoS 2 ) composites and fabricated it as an innovative electrode material to remove Cu 2+ in a multi-ion coexistence system. With the synergistic effect of electric double layer (EDL) and complexation between MoS 2 and Cu 2+ , the HBC-MoS 2 -0.02 electrode achieved effective removal of copper ions from low concentration wastewater (25 mg/L) and high electrosorption capacity of 28.97 mg g −1 at 1.0 V. Even in the presence of competing ions (Na + /Zn 2+ /Cu 2+ ), the HBC-MoS 2 -0.02 electrode still can effectively remove Cu 2+ with a final adsorption capacity of 28 mg g −1 , showing its superiority. The mechanism of Cu 2+ removal by HBC-MoS 2 is mainly due to the synergistic effect of EDL and complexation.
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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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ANALYTICA CHIMICA ACTA
·
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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LANGMUIR
·
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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Materials Today Chemistry
·
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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