CELLULOSE
·
2022
·Vol. 30
·期 2
·1171-1191
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IF 6.123
Tu Chao,Sun Zenghui,Huang Fei,Wu Ziwei,Chen Hang
The photocatalytic process is an energy-saving and high-efficiency wastewater treatment technology. In this work, a simple in-situ hydrothermal method was used to prepare a photocatalytic material based on waste loofah with high efficiency, reusability and excellent heterostructure to improve the photodegradation efficiency. The prepared MoS 2 @MIL-101(Fe)@Carboxylated loofah composite material was characterized by scanning electron microscope (SEM), electrochemical impedance spectroscopy (EIS), UV–Vis diffuse reflection spectroscopy (UV–vis DRS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and transient photocurrent (TPC). The composite material demonstrated high adsorption capacity for hydrochloride (TC) and methylene blue (MB) and photocatalytic capacity under visible-light irradiation at room temperature which were attributed to the porous structure, strong visible-light absorption, and low recombination velocity of electron–hole pairs due to the heterojunctions. The loofah sponge used as a substrate can provide a means for powder catalyst recovery and waste cellulose recycling. Meanwhile, the photocatalyst proved excellent stability in the MB degradation experiment and could be reused for four cycles.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Baoyun Ye,Hongyi Chen,Binhao Shen,Chang Liu,Chongwei An,Jingyu Wang,Yong Zhang
In this work, a novel CuO-based nanocomposite was successfully prepared by hydrothermal method . The results of FT-IR, XRD , XPS and SEM indicated that the nano CuO was successfully loaded on GO/MoS 2 sheets. The catalytic ability of the CuO-based composite was researched by the AP thermal decomposition behavior and the combustion behavior of AP/HTPB. The CuO-based composite could significantly enhance the AP thermal decomposition performance through decreasing the activation energy of AP during the thermal decomposition process. Especially for CuO(90)@MG(10), the AP thermal decomposition temperature was reduced from 437.5 to 334.9 °C and the heat release increased from 396.7 to 1576.8 J/g by adding 4% of the CuO-based nanocomposite. After adding the CuO-based nanocomposite, the ignition delay time of AP/HTPB solid propellant decreased obviously from 0.346 s to 0.109 s with a higher flame height and a stronger flame brightness during the combustion process, indicating that the CuO-based nanocomposite could effectively promote the combustion behavior of AP/HTPB composite solid propellant. In summary, the CuO-based nanocomposite could be applied as an excellent catalyst for improving AP thermal decomposition and a combustion catalyst for AP-based composite solid propellants.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jing Xu,Zhong Dong,Yujin Li,Ke-Jing Huang,Kening Liu,Chengyuan Cao
Water system zinc ion batteries (ZIBs) displays the attractive advantages and it has been considered as the main energy storage device to replace lithium ion batteries (LIBs). Unfortunately, the existing cathode materials are far from achieving the excellent performance required by increasing energy consumption. In recent years, the popular MoS 2 materials still suffer from the inherent defects of poor electrical conductivity, unstable structure, and large volume expansion and lamellar stacking during charging and discharging, resulting in weak periodic stability and severely hindering its commercial applications. In view of the special requirements of cathode materials for ZIBs, this work innovatively proposes the construction of new-type ternary composite nanomaterials, comprehensively improve the practicability of MoS 2 materials. The experimental results confirm that the prepared MoS 2 @WS 2 @CC composite material has high specific capacity and excellent rate performance, due to the synergistic effect of conductive carbon fiber substrate and large layer spacing WS 2 which can improve the volume expansion and diffusion rate fundamentally. Therefore, we can predict that the MoS 2 @WS 2 @CC composite is expected to accelerate the commercial application of ZIBs, and provide ideas for the design of other energy storage materials.
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Qiwen Wang,Meng Wang,Nan Zhang,Xin Huang,Xiaohong Wang,Shengtian Wang
A novel electrochemical sensor based on MoS 2 nanofibers and polyoxometalate H 3 PMo 12 O 40 (HPMo) composite was used for the highly selective and sensitive simultaneous detection of ractopamine (RAC) and clenbuterol (CLB). The electrochemical sensor was prepared firstly by MoS 2 electrospun nanofibers as polyoxometalate (POM) carrier. Then, the morphology structure and physicochemical properties of the nanofiber composites modified electrode were characterized by X-ray diffraction (XRD), scanning electron microscopic (SEM), nitrogen adsorption/desorption isotherms, X-ray photoelectron spectroscopy (XPS), Fourier Transform Infrared Spectroscopy (FTIR) and electrochemical technologies. The results showed that HPMo decorated MoS 2 electrospun nanofibers as modified electrodes can not only promote electron transfer but also enhance electrochemical sensing ability towards RAC and CLB. Differential pulse voltammetry (DPV) results proved that the proposed sensor exhibits good stability, high sensitivity and selectivity in terms of a wide range of 1–70 μM for RAC and 1–350 μM for CLB and a low detection limit of 0.056 μM for RAC and 0.085 μM for CLB, respectively. Furthermore, the proposed sensors were applied to real pork sample analysis, which the recovery of RAC and CLB were 98.5 % − 105.6 % and 98.9 % − 103.1 %, respectively. The results indicate that the electrochemical sensors have a wide application prospect in the detection of β-agonists in animal food sample.
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Materials Today Physics
·
2023
·
IF 11.5
Ziqing Yang,Xiaosi Qi,Chen Li,Qiqing Liang,Lei Wang,Junfei Ding,Yunpeng Qu,Xiu Gong,Wei Zhong
Interfacial polarization had a great impact on the attenuation of electromagnetic wave . To aggrandize interfacial polarization, a strategy of constructing the abundant interfaces was proposed and investigated. Herein, CoNi nanospheres , CoNi@SiO 2 nanospheres and core@shell CoNi 2 S 4 /Co 9 S 8 @SiO 2 @MoS 2 flower-like multicomponent nanocomposites (MCNCs) were elaborately designed and successfully fabricated through a simple continuous hydrothermal process, classical Stöber method and hydrothermal treatment . The obtained results demonstrated that the elaborately constructed abundant interfaces greatly boosted the polarization loss ability, which resulted in the enhanced interfacial polarization. Therefore, the as-prepared CoNi 2 S 4 /Co 9 S 8 @SiO 2 @MoS 2 flower-like MCNCs presented the superior electromagnetic wave absorption properties (EMWAPs) compared to the CoNi and CoNi@SiO 2 precursors. Furthermore, the EMWAPs of CoNi 2 S 4 /Co 9 S 8 @SiO 2 @MoS 2 flower-like MCNCs could also be further improved by optimizing the hydrothermal temperature and filler loading. The obtained CoNi 2 S 4 /Co 9 S 8 @SiO 2 @MoS 2 flower-like MCNCs presented the excellent comprehensive EMWAPs including strong absorption capability, broad absorption bandwidth and thin matching thickness, which could be attributed to the unique structure, excellent interfacial polarization and synergistic effect. Therefore, this finding not only demonstrated that introducing the abundant interfaces was an effective strategy to strengthen interfacial polarization for the promotion of EMWAPs, but also provided an alternative approach to exploit the novel high-efficiency microwave absorbers.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yu-Gang Fu,Han-Qiao Liu,Cong Liu,Qiu-Feng Lü
Molybdenum disulfide (MoS 2 ) has a Gibbs free energy comparable to platinum (Pt), suggesting it can replace Pt as a hydrogen evolution reaction (HER) catalyst. However, the shortcomings of the restricted number of MoS 2 active sites and poor intrinsic electrical conductivity have resulted in impeding its widespread application. In this work, Co/MoS 2 @NPC electrocatalyst was prepared by using nitrogen-doped porous carbon (NPC) as a substrate material, and then hydrothermally anchoring cobalt-doped molybdenum disulfide (Co-doped MoS 2 ) on the substrate. Co/MoS 2 @NPC was subsequently applied to hydrogen evolution reaction in acidic and alkaline media. It was found that the overpotential of 0.2Co/MoS 2 @NPC was only 139 mV for HER at 10 mA cm −2 with a Tafel slope of 69 mV dec −1 in acidic medium; while in alkaline medium, its overpotential was 163 mV with a Tafel slope of 106 mV dec −1 , and it operated stably over 10 h. The superior HER performance may be related to the point that NPC as a substrate can uniformly disperse MoS 2 , exposing more active sites and ensuring high electronic conductivity of MoS 2 . In addition, the introduction of Co into MoS 2 changed the intrinsic activity of MoS 2 and interacted with CoS x and pyridine nitrogen in NPC, constituting a ternary catalytic interaction. Therefore, this study provides a novel strategy for optimizing the HER activity of MoS 2 .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
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IF 9.9
Qingqing Li,Yingzhang Shi,Zhiwen Wang,Cheng Liu,Jinhong Bi,Jimmy C. Yu,Ling Wu
A series of dehydrated MoS 2 /UiO-66(SH) 2 (MS/UiS) composites has been prepared as photocatalysts for N 2 fixation. Typically, 10% MS/UiS exhibits the best performance with an NH 4 + yield rate of 54.08 μmol∙g −1 ∙h −1 . 15 N isotope test confirmed that the sample 10% MS/UiS was most effective for reducing N 2 to ammonia. Such enhanced activity was due to the presence of abundant unsaturated Zr and Mo sites which would synergistically promote the adsorption and activation of N 2 . The photogenerated electrons would transfer to the unsaturated Zr-O clusters while part of photogenerated electrons at the interface migrate to MS via Mo VI -O interactions between MS and UiS. These two electron transfer pathways effectively promote the separation of photogenerated carriers. The activated N 2 is reduced to ammonia by the synergistic effect of protonated hydrogen and photogenerated electrons. Finally, a possible N 2 fixation mechanism is proposed which emphasizes the significant roles of nitrogen activation and interface interaction in composites photocatalyst for improving photocatalytic performance.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yumeng Liang,Weiquan Zhan,Yuan Yuan,Noe Zamora-Romero,Feifei Jia,Bingqiao Yang,Zamoniddin Nasrddinov,José Luis Arauz-Lara,Shaoxian Song
The necessity for application of molybdenum disulfide (MoS 2 ) in photocatalytic reduction field required speedy improvement with high reduction and adsorption performance. Here, manganese (Mn) and oxygen (O) dual-doping strategy were taken for demonstrating that enhancing photocatalytic reduction could achieve simultaneous modulation of the reduction and adsorption parameters by optimizing the electronic configuration and hydrophilicity ability in MoS 2 . Benefiting from the Mn and O dual-doping collective effect, the developed Mn,O-MoS 2 exhibited outstanding photocatalytic reduction and recovery performances of gold(I) from thiosulfate leaching solutions with reduction capacity of 1386.98 mg/g and the corresponding recovery of 92.50%. Besides, Mn and O atoms dual doping in MoS 2 accelerated the recovery rate, which was 3 folds higher compared with that of MoS 2 . Experimental and first-principle approaches suggested that the reduction and adsorption ability of MoS 2 were strengthened through tuning the electronic structure and surface property with Mn and O dopants : (1) Mn atoms notably enhanced the conductivity and optimized the electronic structure for facilitating the reduction performance; (2) The incorporated O atoms greatly promoted the adsorption of [Au(S 2 O 3 ) 2 ] 3- by improving the affinity of water molecules and Mn,O-MoS 2 . The work provides a promising strategy to manipulate two-dimensional materials for various applications about catalysts and adsorbent.
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DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 40
·15322-15329
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IF 4.569
Xinze Du,Chaofeng Zhang,Shenglin Liu
The selective activation of C–O ether bonds is an essential tool in organic synthesis and natural polymer depolymerization. However, the direct cleavage of the ether bond is still challenging work, especially breaking this inert and redox-neutral bond to provide one active carbon radical and another oxygen-centered fragment with oxidation capacity that can participate in the controllable radical reaction. We herein report that commercial 2H-MoS2 with negligible acidity can efficiently catalyze the benzylation of arenes with benzyl ethers, and a new Radical-Friedel–Crafts mechanism is proposed, which is quite different from the strong acid-catalyzed Friedel–Crafts mechanism. With dibenzyl ether as the model benzylation reagent, 2H-MoS2 can achieve the homolytic cleavage of the Bn–OR bond to generate the benzyl carbon radical and RO˙ species, identified by EPR measurement and radical trap experiments. The following radical-involved benzylation is confirmed by the Hammett results and a plausible pathway is proposed to clarify the Radical-Friedel–Crafts process. Heterogeneous 2H-MoS2 can be consecutively used four times without regeneration and it offers 94–95% yields of 2-benzyl-1,4-dimethylbenzene from dibenzyl ether and p-xylene in 30 min at 140 °C. Furthermore, this mechanism can provide some inspiration to activate the ether bond and to utilize ether as an oxidant in C–H bond activation.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Hao Huang,Yonglin Lei,Ling Bai,Yao Liang,Han Yang
The morphology of CdS affects its photocatalytic properties and assembly efficiency of CdS-based heterojunction . In this study, various morphologies of CdS, including sloping plate, spherical, flower, lamellar and leaf were synthesized by adjusting different solvents and crystal control agents in solvothermal process. By comparison of geometric matching and photocatalytic activity of the multi-shaped CdS assembling with MoS 2 , the concept of point-flat-plate microstructure assembly was firstly introduced into construction of ternary quasi 2D/2D CdS/MoS 2 /WS 2 heterojunction. Owing to better geometric configuration, quasi 2D/2D CdS/MoS 2 /WS 2 heterojunction exhibited excellent characteristics of photocatalytic degradation of tetracycline . In this work, 97.2% of tetracycline (20 mg/L, 0.1 g/L dosage) was degraded within 60 min under the irradiation of 150 W Xenon light power, which was superior to other previously reported CdS heterojunctions.The enhancement of photocatalytic performance was due to the faster separation of photogenerated electrons and the lower recombination of electron-hole pairs in point-flat-plate CdS/MoS 2 /WS 2 heterojunction. This study provides a promising way to construct highly efficient photocatalyst and other micro-nano structures for different applications.
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ACS Applied Energy Materials
·
2022
·
IF 6.959
Haomin Fang,Jiajia Cai,Haijin Li,Jianmin Wang,Yongtao Li,Wei Zhou,Keke Mao,Qinfeng Xu
Ultrathin (ut) two-dimensional (2D) ZnIn2S4 (ZIS) nanosheets have exhibited great potential in photocatalytic hydrogen evolution. Herein, ultrathin 2D/2D MoS2/ZnIn2S4 (ut-MoS2/ZIS) were designed and prepared via two steps of the in situ hydro/solvothermal method. Benefiting from the ultrathin structure and the large and intimate contact between ut-ZIS and MoS2, the charge transfer was increased and the recombination of photogenerated carriers was suppressed. It is also noteworthy that 4 wt % ut-MoS2/ZIS gave the highest hydrogen evolution rate of 221.71 μmol h–1under visible light irradiation (λ > 420 nm), and the apparent quantum yield was measured to be 11.8% at 420 nm. Meanwhile, ut-MoS2/ZIS showed high stability after 16 h of irradiation. PL, TRPL spectrum, and photoelectrochemical measurement demonstrated that MoS2 cocatalyst playeds a vitally important role in the separation of charge carriers and proton reduction reaction. This work is expected to inspire the design and development of highly efficient ultrathin photocatalysts.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Jing Yang,Xiaoqin Zhang,Jia Tang,Jinlan Li,Aiping Zhang
In this study, molybdenum disulfide (MoS 2 ) was used to enhance a zero-valent iron/hydrogen peroxide (Fe 0 /H 2 O 2 ) Fenton-like system, which was able to remove refractory organic matter from the effluent produced during the treatment of landfill leachate by a membrane bioreactor (MBR). The MoS 2 /Fe 0 /H 2 O 2 system could efficiently remove refractory organic matter (i.e., fulvic acid-like substances and humic-like substances) from the MBR effluent and also exhibited a strong synergistic effect. Under the conditions of initial pH = 3, H 2 O 2 = 40 mmol/L, Fe 0 = 0.4 g/L, MoS 2 = 0.1 g/L, and t = 30 min, compared with a Fe 0 /H 2 O 2 system, the absorbance UV 254 , chroma (CN), and total organic carbon (TOC) removal rates in MBR effluent treated with MoS 2 /Fe 0 /H 2 O 2 increased to 48.68%, 63.85%, and 35.85%, respectively. Through the identification of reactive oxygen species (ROS), the hydroxyl radical (HO • ) concentration and an analysis of the effective utilization rate of H 2 O 2 , as well as an analysis of the morphology of the material, the distribution of Fe compounds, valence changes, and the Fe ion concentration , it was proven that MoS 2 promoted the cycling of Fe 3+ /Fe 2+ in the Fe 0 /H 2 O 2 process. The addition of MoS 2 promoted the Fe 3+ /Fe 2+ cycling reaction through the exposed Mo 4+ active center, significantly promoting the decomposition of H 2 O 2 and the formation of HO • . The MoS 2 /Fe 0 /H 2 O 2 system was able to remove a wide range of aromatic organics, indicating the wide applicability of the system. This study developed a new method for the efficient removal of refractory organic matter from landfill leachate.
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