RSC Advances
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2021
·Vol. 11
·期 18
·10996-11003
·
IF 3.361
Mingxing Duan,Qingyan Cheng,Mingming Wang,Yanji Wang
A new noble metal-free Ni–Co–P/HAP (hydroxyapatite) amorphous alloy catalyst was synthesized by an impregnation-chemical reduction method; the structure and properties of the catalysts were characterized by XRD, SEM, BET, XPS and DSC. Based on the model of the hydrodeoxygenation (HDO) of vanillin to 2-methoxy-4-methylphenol (MMP) with formic acid as a hydrogen source, the catalytic performance of the catalyst was studied. The results found that the Ni–Co–P/HAP catalyst exhibited excellent catalytic activity for the in situ HDO reaction of vanillin compared with Ni–P and Ni–Co–P. The conversion of vanillin could be high to 97.86% with MMP selectivity of 93.97% under optimized reaction conditions. In addition, mechanism studies have shown that the side reaction of carbocation and vanillyl alcohol (HMP) condensation can be effectively reduced with increasing the hydrogenation rate, thereby the selectivity of MMP was effectively increased.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 45
·期 9
·4236-4245
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IF 3.591
Jia Zhang,Jian Yang,Junying Tian,Hailong Liu,Xuemei Li,Weiguo Fang,Xun Hu,Chungu Xia,Jing Chen,Zhiwei Huang
The synthesis of useful amines from bio-based carbonyl compounds is highly desired owing to their mild reaction conditions and green sustainability. The reductive amination of bio-furfural-derived 2-hydroxytetrahydropyran (2-HTHP) to high-value-added 5-Amino-1-pentanol (5-AP) was carried out over efficient Ni–Al2O3 catalysts prepared by a co-precipitation method. Among the Ni–Al2O3 catalysts with different Ni loadings (0–100 wt%) tested, the 50Ni–Al2O3 catalyst exhibited the highest 5-AP yield of 91.3% under mild conditions of 60 °C and 2 MPa H2. This catalyst also presented good stability during a 150 h time-on-stream without appreciable deactivation. Characterization results showed that the 50Ni–Al2O3 catalyst exhibited small Ni0 nanoparticles (5.5 nm), a high reduction degree (up to 95%), and a large amount of strong Lewis acid sites. The cooperative catalysis of the strong Lewis acid sites and highly dispersed metallic Ni sites is suggested to play an important role in achieving high efficiency in 2-HTHP reductive amination.
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CARBON
·
2021
·
IF 9.594
Panpan Zhou,Xiaokang Wang,Zhi Song,Meng Wang,Wentao Huang,Mingxun Yu,Lixi Wang,Qitu Zhang
Ordered mesoporous carbon (OMC) has been regarded as a promising carbonaceous material for microwave absorption (MA) owing to its high specific surface area, sufficient ordered mesoporous nanostructures and easy decoration. However, its development in MA performance is seriously hampered by its shortcomings of lacking magnetic loss and poor impedance matching. Herein, a series of multi-dimensional ternary OMC/SiO 2 @Ni composites with hierarchical nanostructure (zero-dimensional (0D) Ni nanoparticles and three-dimensional (3D) OMC/SiO 2 framework) is successfully prepared via a self-assembly method, an in situ synthesis, and followed by a calcination treatment. By adjusting the calcination temperature and Ni nanoparticle content, OMC/SiO 2 @Ni composites with different graphitization degree, Ni nanoparticle size and magnetic properties can be easily obtained. Remarkably, OMC/SiO 2 @Ni0.5-700 composite exhibits an exceedingly strong reflection loss (RL) value of −62.2 dB and a broad effective absorption bandwidth (RL ≤ −10 dB) of 8 GHz (almost covers X and Ku bands) with a layer thickness of only 2.5 mm. Such fabulous MA performance comes from a synergy between the well-designed hierarchical ternary nanostructure and improved impedance matching. This work provides an insight for rational structure design and multi-component loss mechanism of lightweight MA material , which shows great potential in practical applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Xiu-Ling Li,Wei Zhang,Yong-Qing Huang,Qiang Wang,Ji-Min Yang
Toxic azo dyes pose a significant threat to all living organisms when they are directly discharged into aqueous environments. Therefore, new adsorbents with excellent adsorptive efficiencies are urgently required for the removal of azo dyes. Herein, the adsorption space, surface charge, morphological and structural defects, and mesostructure of MIL-101(Cr) were adjusted by Ni(II) doping to understand the effects of these factors on the adsorptive removal of anionic azo dyes such as Congo red (CR), methyl orange (MO), and acid chrome blue K (AC) from aqueous solution. The adsorption uptakes of Ni(II)-doped MIL-101(Cr) toward CR (1607.4 mg g −1 ) and MO (651.2 mg g −1 ) exceeded those of undoped MIL-101(Cr) by 31.4% and 23.4%, respectively, whereas Ni(II) doping decreased the adsorption uptake toward AC (161.0 mg g −1 ) by 50.2%. Ni(II) doping produced morphological and structural defects, resulting in a new mesoporous structure, which played a more prominent role than electrostatic interactions and adsorption space in increasing the adsorption uptake toward linear anionic azo dyes, such as CR and MO. Despite these effects, for nonlinear azo dyes such as AC the adsorption uptake was decreased by steric hindrance between the Ni(II)-doped MIL-101(Cr) adsorbent and the dye. Thus, the adsorption performance of Ni(II)-doped MIL-101(Cr) was found to be controlled by the synergetic interplay among electrostatic interactions, π–π interactions, steric hindrance, and the morphological and structural defects, pore volume , and mesoporous structure of the adsorbent.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Xianwen Zhang,Ping Li,Bin Xu,Jingxia Wang,Guangyin Fan,Xiaobin Zhang,Xiaoqiang Liu,Kaiming Zhang,Weidong Jiang
Selective hydrogenation of halogenated nitrobenzenes (XNBs) to halogenated amines (XANs) is of great importance for practical applications. Non-noble metal-based catalysts have shown prominent advantages in price and reserves accompanying low activity and selectivity toward the hydrogenation of halogenated nitrobenzenes (XNBs) even under harsh conditions. In this work, inexpensive Ni–Co-based composites (NxCC) were prepared for in situ tandem hydrogenation of XNBs to XANs by using hydrogen released from ammonia borane (AB) hydrolysis under ambient pressure. The results show these NxCC samples exhibited superior catalytic performance against Co3O4 or NiO samples. A selected N0.2CC catalyst as the mainly screened one can quantitatively convert XNBs to XANs with unprecedented activity with 100% XAN conversion. This catalyst can completely convert m-chloronitrobenzene (m-CNB) to m-chloroaniline (m-CAN), suggesting N0.2CC efficiently suppresses the further dichlorination of m-CAN. Recycling test shows the N0.2CC possesses higher stability and recyclability. The N0.2CC catalyst was found to be a dual catalyst that synergistically catalyzes both the AB dehydrogenation (about 1735 mL min–1 g–1 of hydrogen generation rate) and the subsequent hydrogenation (almost 100% conversion) of XNBs. Notably, it is the first time that the rapid in situ hydrogen activation (IHA) which facilely arouses the efficient hydrogenation of adsorbed substrate on the surface of catalyst has been elaborated. From a unique perspective, distinctive and simple control experiments were innovatively designed for testifying the advantage of tandem hydrogenation in contrast with traditional hydrogenation. This work presents an efficient and environmental strategy to selectively produce XANs from XNBs using high-performance non-noble metal composites.
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Nano Materials Science
·
2021
·
IF 0
Ning You,Shuai Cao,Mengqiu Huang,Xiaoming Fan,Kun Shi,Haijian Huang,Zhangxian Chen,Zeheng Yang,Weixin Zhang
Improving catalytic activity and durabilty through the structural and compositional development of bifunctional electrocatalysts with low cost, high activity and stability is a challenging issue in electrochemical water splitting. Herein, we report the fabrication of heterostructured P-CoMoO 4 @NiCoP on a Ni foam substrate through interface engineering, by adjusting its composition and architecture. Benefitting from the tailored electronic structure and exposed active sites, the heterostructured P-CoMoO 4 @NiCoP/NF arrays can be coordinated to boost the overall water splitting. In addition, the superhydrophilic and superaerophobic properties of P-CoMoO 4 @NiCoP/NF make it conducive to water dissociation and bubble separation in the electrocatalytic process. The heterostructured P-CoMoO 4 @NiCoP/NF exhibits excellent bifunctional electrocatalysis activity with a low overpotential of 66 mV at 10 mA cm −2 for HER and 252 mV at 100 mA cm −2 for OER. Only 1.62 V potential is required to deliver 20 mA cm −2 in a two-electrode electrolysis system, providing a decent overall water splitting performance. The rational construction of the heterostructure makes it possible to regulate the electronic structures and active sites of the electrocatalysts to promote their catalytic activity.
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Materials Advances
·
2021
·Vol. 2
·期 12
·3927-3939
·
IF 0
Ya-Fang Zhang,Ben Dai,Dan Zhao,Di-Hui Zhang,Meng-Xing Xu,Xiang-Hua He,Chao Chen
To span the inherent application limitation of state-of-the-art catalysts for the chemical transformation of biomass derivatives, here, we formulate a series of Pr–Ni–P catalysts for the hydrogenation transformation of biomass-derived levulinic-acid, furfural and maleic anhydride. With comprehensive characterizations, Pr–Ni–P samples are verified as (PrPO4)m/Ni2P nanocomposites with a molar ratio (m) in the range of 0.24–11.0. In comparison with the poor catalytic performance of Ni2P, a ten-fold enhancement in TOF up to 0.45 s−1 and at least five-time promotion on the yield of objective products up to 91–98% are achieved by introducing proper amounts of PrPO4 to form reusable (PrPO4)m/Ni2P nanocomposites. Surface chemistry and kinetic mechanism studies further disclose that the cooperative catalytic function of two components, in particular the exclusive capability of PrPO4 to activate hydrogen, is responsible for the promoted hydrogenation transformation of biomass derivatives via a quick Langmuir–Hinshelwood process over (PrPO4)m/Ni2P. These findings imply that an easily obtainable, cost-affordable and robust rare earth phosphate like present PrPO4 could be a potential replacement catalytic component for the traditional metal catalyst in the hydrogenation transformation reactions of biomass derivatives, which was also worth noting as a new kind of basic material for other green mass-transformation techniques involving hydrogen activation processes such as corresponding optical and electrical transformations.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Min Wen,Na Yang,Jiahong Wang,Danni Liu,Wenchao Zhang,Shi Bian,Hao Huang,Xingchen He,Xin Wang,Seeram Ramakrishna,Paul K. Chu,Shihe Yang,Xue-Feng Yu
Two-dimensional (2D) semiconductors are promising photocatalysts; in order to overcome the relatively low efficiency of single-component 2D photocatalysts, heterostructures are fabricated for effective charge separation. Herein, a 2D heterostructure is synthesized by anchoring nickel nanoparticle-decorated black phosphorus (BP) nanosheets to graphitic carbon nitride (CN) nanosheets (CN/BP@Ni). The CN/BP@Ni heterostructure exhibits an enhanced charge separation due to the tight interfacial interaction and the cascaded electron-transfer channel from CN to BP and then to Ni nanoparticles. Possessing abundant active sites of Ni and P–N coordinate bonds, CN/BP@Ni shows a high visible-light-driven H2 evolution rate of 8.59 mmol·h–1·g–1 with the sacrificial agent EtOH, about 10-fold to that of CN/BP. When applying benzyl alcohol to consume photogenerated holes, CN/BP@Ni enables the selective production of benzaldehyde; therefore, two value-added products are obtained in a single closed redox cycle. This work provides new insights into the development of photocatalysts without non-noble metals.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Qilin Chang,Cuiping Li,Jing Sui,Geoffrey I.N. Waterhouse,Zhi-Ming Zhang,Liang-min Yu
Eggshell membrane-derived Co-Co x S y -Ni/N,S-codoped carbon composites (EM-Co-Co x S y -Ni/N,S-C) were synthesized by heating a Co 2+ -Ni 2+ -2-methylimidazole/eggshell membrane precursor in a N 2 atmosphere. The dual atom (nitrogen (N) and sulfur (S)) doping of C was realized easily by using eggshell membrane as the joint source of carbon, N and S. The EM-Co-Co x S y -Ni/N,S-C composites showed remarkable electromagnetic wave absorption (EMWA) performance. The minimum reflection loss (RL min ) reached −48.5 dB (10.1 GHz, 3.5 mm) and the Effective absorption bandwidth (EAB) achieved 7.4 GHz (10.3–17.7 GHz, 3 mm). By adjusting the concentration of 2-methylimidazole, impressive RL min (-41.5 dB, 13.9 GHz) and EAB (6.5 GHz, 11.5–18 GHz) could be achieved at an absorber thickness of 2.5 mm. Eggshell membrane exhibits considerable potential in designing heteroatom doped carbon based EMW absorbents with high-performance and low cost.
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CARBON
·
2021
·
IF 9.594
Zhen Xiang,Xiang Zhang,Yuyang Shi,Lei Cai,Jie Cheng,Haojie Jiang,Xiaojie Zhu,Yanyan Dong,Wei Lu
Developing high-efficiency electromagnetic wave absorption materials with versatility has been a hotspot and it remains a huge challenge. Here, we reported versatile laminated Ni nanoparticles @ porous carbon (Ni@C) nanocomposites synthesized by a facile carbonization of Ni-based metal-organic frameworks (MOFs) precursor. It was found that the phase components (Ni and C phases) and nano/microstructure (laminated and porous characterizations) were well-modified by controlling the calcination temperature, which led to the variation of the degree of graphitization , magnetic properties , and electromagnetic performances. It showed that the laminated porous Ni@C nanocomposites achieved enhanced microwave absorption performances with a thin thickness of 1.5 mm, a strong reflection loss of −59.8 dB and an effective absorption bandwidth of 4.5 GHz. The underlying microwave absorption mechanism was owing to the improved synergistic effects of polarization relaxation, electron transport , ferromagnetic resonance, as well as multiple reflections and scattering in the laminated porous Ni@C nanocomposites. Furthermore, the multicomponent and laminated porous architecture endowed nanocomposites with favorable waterproof, heat isolation and infrared shielding versatility. Therefore, this work demonstrated a facile approach to develop MOFs-derived versatile laminated porous nanocomposites with efficient microwave absorbing performances.
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Journal of Cleaner Production
·
2021
·
IF 9.297
Xiuling Guo,Yang Ruan,Zenghui Diao,Kaimin Shih,Minhua Su,Gang Song,Diyun Chen,Shuao Wang,Lingjun Kong
With the wide application of nuclear energy and the rapid development of mining, a great quantity of uranium (U(VI)) containing wastewater is inevitably generated. In this work, a facile environmental-friendly coprecipitation method was proposed for the green synthesis of binary layered double hydroxides (Ni–Co LDH W -7), which could be used to efficiently adsorb U(VI) from wastewater. Pseudo-second-order kinetic model and Dubinin-Radushkevich model fitted well with the adsorption of U(VI) on Ni–Co LDH W -7, the maximum adsorption capacity of U(VI) on Ni–Co LDH W -7 was 201.09 mg/g calculated by the Langmuir model. Adsorption equilibrium reached after 30 min, which is a spontaneous and endothermic process . Fourier Transform Infrared Spectrometer (FTIR) and X-ray Photoelectron Spectroscopy (XPS) measurements manifested that the favorable U(VI) extraction on Ni–Co LDH W -7 is mainly ascribed to inner-layer surface electrostatic interaction and complexation, which is dominated by abundant oxygen-containing M-OH and interlayer OH − ions. Briefly, this work provides a facial and environmental-friendly Ni–Co LDH W -7 for removing U(VI) in actual uranium-containing wastewater.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 25
·期 5
·1503-1512
·
IF 2.647
Zhang Aiqin,Xiao Yuanhua,Cao Yang,Fang Hua,Zhang Yong,Das Paramita,Zhang Huan
Transition metal–based catalysts are considered to be promising materials to replace noble metal catalysts for electrocatalytic water splitting. Herein, a flexible electrode composed of Co-Ni-P ternary catalysts and carbon fiber paper substrate (Co-Ni-P/CFP) was successfully fabricated and applied in water electrolysis. The Co-Ni-P coatings were deposited on CFP by a one-step cyclic voltammetric electrodeposition method and the surface of the composite material exhibits nano-reticular structure. The formation mechanism was also discussed according to the results of material characterization. Notably, the Co-Ni-P/CFP flexible electrode exhibited superior catalytic performance for both hydrogen and oxygen evolution reactions in alkaline media, which could achieve 10 mA/cm 2 current density with overpotential of 89 mV for HER and 320 mV for OER. Moreover, the Co-Ni-P/CFP electrode could also be used as both anode and cathode electrode to drive overall water splitting and required only 1.64 V to achieve a current density of 10 mA/cm 2 , which was very close to that of the commercial combination of Pt/C and IrO 2 . This affordable and easily obtained electrode offers a new avenue to develop earth-abundant resource catalysts for water electrolysis system.
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