CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Yishuai Fu,Wenliang Wang,Hui Miao,Yangyi Cui,Yutong Chen,Ziwei Wang,Guowei Xiao,Bailiang Xue,Weikun Jiang
Obtaining key platform chemicals from lignin is a sustainable refining concept of the non-petroleum route. Rapid pyrolysis is a potential refining technology, and microwave-assisted catalytic depolymerization with low energy consumption is preferred. Herein, we reported the strategy of microwave-initiated depolymerization using a self-designed dynamic vapor flow reaction system with a facilely prepared CMF@Co-MoS 2 -0.18 catalyst, achieving efficient conversion of lignin (Dealkalize) to monophenol. Under constant microwave irradiation (2.45 GHz), the CMF@Co-MoS 2 -0.18 catalyst had excellent dielectric properties (Dielectric loss factor: 0.56) and microwave heating properties (∼140 s rise to ∼ 600℃). Therefore, microwave-initiated depolymerization of lignin showed that the CMF@Co-MoS 2 -0.18 catalyst can improve the monophenol content (54.72 %) and phenol selectivity (35.84 %) under the synergistic effect of microwave absorptivity and catalysis. The reaction of the lignin model and kinetics analysis show that the CMF@Co-MoS 2 -0.18 catalyst increases the yield of monophenol by reducing depolymerization activation energy and selectively breaking the β -O-4 bond. The finite element analysis pointed out that under microwave irradiation, CMF@Co-MoS 2 -0.18 continuously conducted heat to lignin and the lignin vapor would have sufficient energy to collide with the catalyst active site at a high frequency, which led to an increase in the pre-exponential factor and initiated catalytic depolymerization lignin. In summary, we provide a potential pathway for the rapid conversion of lignin into key platform chemicals.
研究领域:
化学工程
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可再生资源利用
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产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2024
·
IF 5.8
Yang-Yang Xu,Xing Fan,Feng-Yun Ma,Hai-Xu Zou,Xian-Yong Wei
Directly converting lignite into arenes as commodity chemicals and drop-in fuels is a highly desirable target for researchers. However, this is severely limited by the presence of stable inter unit C-O linkages in lignite. Herein, a highly active catalyst, Co-MoS 2 , has been designed and prepared to be used for the selective catalytic cleavage of inter unit C-O bridged bonds (BBs) in the conversion of Naomaohu (NMH), a lignite, to yield arenes. Both catalytic hydrogenation conversion (CHC) and thermal dissolution (a non-catalytic process, named NCHC) of NMH were conducted using n-hexane as the solvent. The soluble fractions from the first stage of NCHC (SF NCHC-1 ) and CHC (SF CHC-1 ), as well as the second stage of NCHC (SF NCHC-2 ) and CHC (SF CHC-2 ) were obtained using the same solvent. After the first-stage catalytic treatment, the relative contents of arenes and alkanes in SF CHC-1 increased by 16.7 % and 9.3 %, respectively, compared to those in SF NCHC-1 , and the relative content of oxygen-containing compounds (OCCs), such as alcohols, phenols , esters, ketones , acids, and furans, decreased by 13.2 %. For the second-stage conversion, the relative contents of arenes and alkanes in SF CHC-2 were 53.5 % and 15.5 % higher than those in SF NCHC-2 , and the relative contents of OCCs was only 6.6 % in SF CHC-2 . The catalytic mechanisms of cleavage of C-O BBs and deoxygenation were proposed based on the CHC of model compounds and density functional theory (DFT) calculation. The adsorption of OCCs and the activation of released hydrogen radical (H·) by Co-MoS 2 , followed by H· addition to the carbon atom connected to oxygen in C-O BBs and oxygen-containing functional groups, are crucial for the cleavage of C-O BBs and formation of deoxygenated compounds, particularly arenes.
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
NANO
·
2024
·
IF 1
Sai Wang,En-Ni Wu,Liang Meng,Zhen-Jun Wang,Tuan-Tuan Wang
To improve the activation efficiency of PMS to efficiently degrade antibiotic sulfadiazine (SD), herein, a Co@MoS 2 catalyst was prepared by a one-step hydrothermal process. The unique petal-like structure of MoS 2 enables the transition metal Co to achieve high dispersion and avoid agglomeration. Mo(IV) and unsaturated S accelerate the electron transfer between Co 2 + and Co 3 + to improve the cycling efficiency and thus realize the efficient activation of PMS. The results of active substance quenching experiment and ESR analysis show that the main active substance for the efficient degradation of SD by Co@MoS 2 is the non-radical 1 O 2 , while the other three radicals ⋅ O − 2 , ⋅OH and SO • − 4 contribute significantly to the efficient degradation of SD. And after 5 cycles, the degradation could still be as high as 90%. The strong consolidation of Co on the petal-shaped sheet of MoS 2 ensures the stability of Co@MoS 2 catalyst.
研究领域:
环境科学
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催化
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纳米技术
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ORGANOMETALLIC CHEMISTRY
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2024
·
IF 2.1
Haoyuan Zheng,Qianyuan Mo,LiJing Song,Xi Zhang,Jie Huang,Guishang Sheng
Co-MoS 2 @BC catalysts were prepared using pine cones as biochar source, and the surface morphology and microstructure of the catalysts were analyzed and the successful preparation of the materials was verified by adopting the characterization means such as BET, SEM, XRD, FTIR, TEM, XPS, Raman. At the concentration of tetracycline (TC) in water of 20 mg/L, the reaction system with catalyst participation resulted in 98.88 % pollutant removal and efficient degradation, and the effects of TC concentration, coexisting chemicals, initial pH, catalyst dosage, PMS dosage, and other factors on the catalytic performance of Co-MoS 2 @BC were investigated. The results of quenching experiments and electron paramagnetic resonance (EPR) examinations were combined, the reactive substances whose main roles in the reaction process were identified as single linear oxygen ( 1 O 2 ), and the simultaneous presence of electron transfer-mediated non-radical pathways in the Co-MoS 2 @BC/PMS/TC system was confirmed using Linear sweep voltammetry (LSV). The reaction process's intermediates were examined using liquid chromatography-mass spectrometry (LC-MS), which also offered potential degradation routes.
研究领域:
环境科学
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催化材料
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产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Yanfei Chen,Yukun Lu,Zekun Guan,Shoujie Liu,Chao Feng,Guangxun Sun,Jilei Liang,Yuan Pan,Chenguang Liu,Yunqi Liu
Herein, a novel single-molecule confinement-sulfurization strategy was proposed to construct ultrafine Co-MoS 2 monolayer catalysts by using oil-soluble single-molecule polyoxometalates (POMs), (DODA) 6 Co 2 Mo 10 , as precursors. Well-defined Co 2 Mo 10 -POM, acting as molecular pre-assembling platform, is introduced for the atomically precise construction of bimetallic sites. Highly efficient conversion of VR under severe condition is realized with (DODA) 6 Co 2 Mo 10 . The origin of prominent catalytic performance can be attributed to the in-situ formation of ultrafine single-layered Mo-based nanosheets with abundant exposed CoMoS active sites. By combining synchrotron radiation-based X-ray absorption spectroscopy and density functional theory calculations, we further discover that there is clearly intimate interaction between Mo and Co atoms and the dissociation of molecular hydrogen at CoMoS phases is energetically preferred, leading to remarkable hydrogenation and coke suppression activity. This work highlights an idea on the rational design and targeted synthesis of ultrafine bimetallic catalysts for slurry phase HCK with dramatically synergistic catalysis.
研究领域:
化学工程
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催化材料科学
✓ 已验证
DOI
高影响因子
TALANTA
·
2023
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IF 6.1
A. Ravikumar,S. Kavitha,Amutha Arul,P. Rajaji,Tamilselvan G,Xuesong Li,Beibei Wu,Velappa Jayaraman Surya,Jun Tang,Yuvaraj Sivalingam,Zhen Zhang
The rational development of efficient nanozymes for the colorimetric detection of targets is still challenging. Herein, Prussian blue analogues of Ni–Co–MoS 2 nano boxes were fabricated for colorimetric detection of glyphosate and copper ions owing to its peroxidase like activity. At the sensing system, the Ni–Co–MoS 2 nano boxes display high peroxidase activity, which could catalytically oxidize the colourless TMB to blue colour oxTMB. In presence of glyphosate in this sensing system the blue colour is diminished, ascribed to the inhibit the catalytic activity of Ni–Co–MoS 2 nano boxes. Concurrently, the addition of copper ion, which result in blue colour was reappear due to the generation of glyphosate-copper complex formation. The Ni–Co–MoS 2 nano boxes based colorimetric sensing platform was developed to sensitive detection of glyphosate and copper ions with low detection limit of 3 nM for glyphosate and 3.8 nM for copper. This method also displays satisfactory outcomes from real samples analysis and its good accuracy. Therefore, this work provides a great potential for rapid detection of the targets from the environments.
研究领域:
分析化学
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环境科学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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.
研究领域:
环境科学
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催化
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水处理
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
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2022
·Vol. 32
·期 5
·2237-2248
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IF 2.036
Liu Cansen,Zhen Haowen,Huang Qishan,Chen Wanlin,Mai Yongjin,Zhang Liuyan,Jie Xiaohua
The dispersity of incorporated particles is critical for the creation of composite coatings with enhanced performance. Here, we propose a mechanical agitation and ultrasound-assisted pulse electroplating technique for producing exfoliated MoS 2 reinforced cobalt-based composite coatings with improved tribological and electrochemical properties. The dispersity of exfoliated MoS 2 and its corresponding effect on the microstructure, microhardness, tribological and electrochemical behaviors of the resultant composite coatings are systematically investigated. The results reveal that the outstanding dispersity of exfoliated MoS 2 in electrolyte is beneficial to its even distribution and incorporation in the composite coating, endowing the resultant composite coatings with a smooth surface, compact structure, high hardness, remarkable antiwear and friction reduction performance as well as superior corrosion resistance. This study offers a strategy for producing high-performance composite coatings with promising practical applications. Graphical Abstract
研究领域:
材料科学
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表面工程
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2021
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IF 2.495
Junjie Zhou,Xu Meng,Jiaying Yan,Xiang Liu
Since dimethylamine-borane ($ 463/kg) is much cheaper than ammonia borane ($ 13,921/kg), the hydrolysis of dimethylamine-borane catalyzed by transition metal nanocatalysts has long been proposed as a viable opportunity for hydrogen evolution, but it often required noble metals nanocomposites, such as Pt, Rh and Ru. Herein, we first report the ultrafine non-noble metal nanoparticles supported on MoS 2 nanosheet (including Fe/MoS 2 , Co/MoS 2 , Ni/MoS 2 and Cu/MoS 2 ) for the H 2 evolution from hydrolysis of dimethyl amine-borane (DMAB). Among them, Co/MoS 2 is found to be more efficient than others for the H 2 evolution, with the TOF of 374 mol (H2) •mol cat −1 •h −1 . Kinetic isotopic experiment and the tandem reaction have confirmed that H 2 evolution by using H atoms in water.
研究领域:
催化化学
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氢能
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纳米材料
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化学储氢
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无机化学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
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2024
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IF 6.3
Weiwei Zhang,Su Xu,Yuanjin Zhao,Huan Chen,HuaYing Li,Han Liu
Sulfamethazine (SMT), a sulfonamide antibiotic, is widely present in medical wastewater and is one kind of refractory organic pollutants that endanger the water environment. An efficient and environmentally friendly degradation method is crucial for treating antibiotic wastewater. Based on the strong activation capability of transition metal ions for peroxymonosulfate (PMS) and highly affinity of MoS 2 towards PMS, the decoration of MoS 2 with transition metal ions would be an effective activation of PMS for degradation of organic pollutants. In this work, Co@MoS 2 was synthesized by hydrothermal method and used as catalyst for the degradation of SMT with PMS. Almost 100 % of sulfamethazine (SMT) was removed within 10 min. The EPR and quenching experimental results suggested that 1 O 2 was the main active species for SMT degradation in the Co@MoS 2 /PMS system. The accelerated valence cycle between Co 2+ and Co 3+ was the key factor to PMS activation and SMT degradation. Further, the Co@MoS 2 /PMS system showed good applicability to different pollutants, excellent reusability for SMT removal. Therefore, the results demonstrated that the present study process was a promising strategy for antibiotic removal.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
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IF 8.3
Weidong Cai,Zhixing Gan,Feng Nan,Shun Wang,Fuxiang Ji,Yiqiang Zhan
We present a novel and stable laminated structure to enhance the performance and stability of silicon (Si) photocathode devices for photoelectrochemical (PEC) water splitting. First, by utilizing Cu nanoparticle catalysts to work on a n+p-black Si substrate via the metal-assisted chemical etching, we can achieve the black silicon with a porous pyramid structure. The low depth holes on the surface of the pyramid caused by Cu etching not only help enhance the light capture capability with quite low surface reflectivity (<5%) but also efficiently protect the p–n junction from damage. To improve the charge migration efficiency and mitigate parasitic light absorption from cocatalysts at the same time, we drop casted quantum dots (QDs) MoS2 with the size of nanometer scale as the first layer of catalyst. Hence, we then can safely electrodeposit cocatalyst Co nanoparticles to further enhance interface transfer efficiency. The synergistic effects of cocatalysts and optimized light absorption from the morphology and QDs contributed to the overall enhancement of PEC performance, offering a promising pathway for an efficient, low cost, and stable (over 100 h) hydrogen production photocathode.
研究领域:
材料科学
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可再生能源
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光催化
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纳米技术
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半导体器件
✓ 已验证
DOI
高影响因子
Materials Horizons
·
2026
·
IF 10.7
keru song,Anze Shui,Hulei YU
Defect-rich heterointerfaces integrated with adjustable crystalline phases and atom vacancies as a promising strategy to boost electromagnetic wave (EMW) absorption. However, challenges remain in precisely controlling the balance between construction and the electromagnetic loss mechanism. In this study, an innovative Co-MoS2-xOx@NC core-shell fiber with multiple loss mechanisms was synthesized through an in-situ growth and carbonization process. This structure ingeniously combines ZIF-67 with a carbon fiber (CNF) conductive network to form continuous conductive pathways, providing an ideal medium for conduction loss. Simultaneously, Co ions embedded between MoS2 layers induce strong lattice distortion and abundant vacancies, forming numerous heterointerfaces between Co, MoS2, and CNF. Significant differences in electron density and charge redistribution at the interface greatly enhance interfacial polarization loss. MoS2 stacked nanosheets extend the transmission path of EMWs, dissipating electromagnetic energy by enhancing multiple reflections and scattering. Consequently, Co-MoS2-xOx@NC fibers achieve a strong EMW with a minimum reflection loss of −66.43 dB at 1.98 mm and a wide effective absorption bandwidth of 5.80 GHz at 1.87 mm. This study highlights synergistic effects of lattice vacancies and heterogeneous interfaces, offering a promising solution for constructing an advanced CNF matrix wave-absorbing material.
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产品关联
DOI
PubMed
高影响因子
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