NANOTECHNOLOGY
·
2016
·Vol. 27
·期 46
·46LT03
·
IF 3.573
Shuai Hao,Libin Yang,Liang Cui,Wenbo Lu,Yingchun Yang,Xuping Sun,Abdullah M Asiri
NaBH4 has been considered as one of the most advantageous candidates for chemical hydrogen storage, but it is still a huge challenge to design efficient non-noble-metal catalysts for on-demand hydrogen generation from NaBH4 hydrolysis. In this paper, we demonstrate for the first time that a spinel FeCo2O4 nanowire array supported on carbon cloth (FeCo2O4 NA/CC) behaves as an efficient earth-abundant catalyst toward NaBH4 hydrolysis in alkaline solutions with an activation energy of 44.98 kJ mol−1. Such FeCo2O4 NA/CC offers a hydrogen generation rate of 2551 ml min−1 g−1 under ambient conditions, with good stability and reusability. Its use as an ON/OFF switch for on-demand hydrogen generation is also demonstrated successfully.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Fanghui Wang,Yajun Zhang,Yanan Wang,Yimeng Luo,Yuenan Chen,Hong Zhu
We used the chemical vapor deposition method to prepare dandelion-like CNTs-Ni foam composite carrier, and then the electroless plating method was used to deposit Co-P nanoparticles on the CNTs of the CNTs-Ni foam. The CNTs-Ni foam and Co-P/CNTs-Ni foam were characterized by BET, SEM, XRD , XPS , and EDS . The results showed that CNTs were uniformly and densely grown in situ on the surface of Ni foam and were further successfully coated with Co-P nanoparticles. The Co-P/CNTs-Ni foam catalysts still maintained the dandelion-like structure and reached a maximum hydrogen production rate of 2430 mL min −1 g −1 at 25 °C. Furthermore, the Co-P/CNTs-Ni foam catalysts also exhibit a remarkable cycling performance and low activation energy (49.94 kJ mol −1 ) for the methanolysis of sodium borohydride .
研究领域:
材料科学
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催化化学
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Caiwen Pan,Xiaoyan Dong,Qinghong Shi,Linling Yu,Yan Sun
Methyl parathion (MP) is a typical organophosphate pesticide widely used in agriculture, causing serious pollution. MP hydrolysis generates a toxic 4-nitrophenol (4-NP) with environmental risks, but a subsequent reduction of 4-NP produces a nontoxic 4-aminophenol (4-AP), which serves as a resource for further use in chemical synthesis. Thus, the detoxification and resourcilization of MP are of great significance for environmental remediation and sustainable development. However, most reports on MP cascade conversion require two different catalysts, each of which is single-catalytic. Herein, we report the first self-cascade nanocatalyst with bicatalytic activities of hydrolysis and reduction based on cupric metal–organic framework (Cu-AZB) nanosheets for the conversion of MP to 4-AP. It was found that Cu-AZB could completely convert MP to 4-AP in the presence of NaBH4 within 10 min. Moreover, hydrolysis was 19-fold accelerated by the NaBH4-mediated reduction in the self-cascade catalysis, so a catalyst with a high cascade conversion efficiency against MP with an activity factor of 513.2 min–1 g–1, a reaction rate constant of 0.25 min–1, and a half-life of 2.82 min was achieved, which was more efficient than literature-reported cascade catalysts. The results demonstrated the application potential of the bicatalytic Cu-AZB in the complete detoxification and conversion of the toxic pollutant into a nontoxic resource through one-pot cascade catalysis.
研究领域:
环境科学
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催化
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材料科学
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化学工程
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高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 150
·期 12
·3394-3401
·
IF 2.482
Qiao Chenxia,Jia Wenlan,Zhong Qiming,Liu Bingyu,Zhang Yifu,Meng Changgong,Tian Fuping
Abstract Novel Cu-nanoparticles (NPs) embedded in porous carbon materials (Cu@C-x) were prepared by one-pot pyrolysis of metal–organic frameworks (MOF) HKUST-1 at different temperatures. The obtained material Cu@C-x was used as a cost-effective catalyst for the hydrogenation of nitrobenzene using NaBH 4 as the reducing agent under mild reaction conditions. By considering the catalyst preparation and the catalytic activity, a pyrolysis temperature of 400 °C was finally chosen to synthesize the optimal catalyst. When the aromatic nitro compounds with reducible groups, such as cyano, halogen, and alkyl groups, were tested in this catalytic hydrogenation, an excellent selectivity approaching 100% was achieved. In the recycling experiment, a significant decrease in nitrobenzene conversion was observed in the third cycle, mainly due to the very small amount of catalyst employed in the reaction. Hence, the easily prepared and cost-effective Cu@C-400 catalyst fabricated in this study demonstrates potential for the applications in selective reduction of aromatic nitro compounds. Graphic Abstract The catalyst Cu@C-400 exhibited 100 % conversion and high selectivity for the hydrogenation of industrially relevant nitroarenes.
研究领域:
材料科学
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化学工程
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催化
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Yuanshuai Li,Haijun Lu,Yuting Wang,Xiaoli Li
A highly active and recyclable catalyst for the deposition of Au nanoparticles on the surface of polydopamine-functionalized poly(vinyl alcohol) macroporous beads was fabricated through the oxidative polymerization of dopamine and in-situ reduction route. The morphology and structure of PVA-PDA@Au beads were characterized using scanning electron microscopy, transmission electron microscopy , X-ray photoelectron spectroscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy , X-ray power diffraction and N 2 adsorption–desorption measurement. The as-prepared PVA-PDA@Au beads combined the advantages of PVA-PDA beads and Au NPs. PVA-PDA@Au beads exhibited enhanced catalytic activity towards the degradation of Rhodamine B (RhB) in the presence of NaBH 4 with removal efficiency up to 99.5% in 5 min at an initial RhB concentration of 100 mg/L and a catalyst amount of 0.5 g/L. PVA-PDA@Au beads could be easily separated and recycled from the reaction system by simple filtration, and reused for the degradation of RhB in six consecutive cycles with a conversion of >99%. Moreover, the mechanism for the degradation of RhB by PVA-PDA@Au beads was proposed. In addition, the catalytic ability of PVA-PDA@Au beads was further studied to remove Tetrabromobisphenol A (TBBPA), in which approximately 100% TBBPA (initial concentration of 25 mg/L) was removed within 90 min. In practical application, RhB as a pollutant in river water was degraded rapidly by PVA-PDA@Au beads with removal efficiency higher than 94%. Thus, PVA-PDA@Au beads possessed high catalytic activity, fast reduction rate and good reusability as well as easy separation and simple preparation, endowing this catalyst with potential application prospect in the treatment of wastewater containing organic pollutants.
研究领域:
材料科学
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环境科学
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化学工程
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Chuanmin Ding,Zhiting Gao,Junwen Wang,Lichao Ma,Ju Shangguan,Qinbo Yuan,Ming Zhao,Kan Zhang
Efficient hydrogen storage, transportation and generation are key-technology for future hydrogen economy . Sodium borohydride (NaBH 4 ) stands out as promising hydrogen energy carrier with merits of high volumetric density and environmentally benign hydrolysis products. Flower-like layered double hydroxide α-Co(OH) 2 with intercalation of B species was synthesized via hydrothermal crystallization method using sodium tetraphenylboron as source of B and alkaline, which makes it different from the previous supporting materials. Pure or mixed cobalt oxides with different valence states containing B (CoO/B, Co 3 O 4 /B, Co+CoO/B, CoO+Co 3 O 4 /B) were subtly prepared via controlling calcination temperature, time and atmosphere for sodium borohydride hydrolysis. Coral-like CoO+Co 3 O 4 /B displayed superior hydrogen generation rate (6478 ml H2 ·min −1 ·g −1 metal ) with arrhenius activation energies of 41.14 kJ/mol for NaBH 4 hydrolysis in alkaline solutions compared to those reported pure precious metals. The out-standing catalytic performance of CoO+Co 3 O 4 /B may be attributed to electron transfer among cobalt oxide. DFT calculation indicates NaBH 4 hydrolysis undergoes a reaction path on CoO+Co 3 O 4 surface with lower relative energies.
研究领域:
材料科学
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能源化学
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Man Yuan,Renzi Yang,Shuoyun Wei,Xiwei Hu,Dan Xu,Jin Yang,Zhengping Dong
Porous organic polymers (POPs) containing nitrogenous substituents have potential practical applications as heterogeneous catalysts based upon controlled porous structure and surface-anchored noble metal nanoparticles (NMNPs). In this work we prepared a POP material from piperazine and cyanuric chloride starting materials (PC-POP). The PC-POP material contains numerous triazinyl moieties, thus rendering the pores hydrophobic. Subsequently, by means of a novel reverse double-solvent approach (RDSA), microdroplets of Pd(AcO) 2 /CH 2 Cl 2 were introduced into the hydrophobic pores of PC-POP in an aqueous environment; Pd(II) was rapidly reduced by NaBH 4 to form ultra-fine Pd NPs and confined within the pores of PC-POP at high dispersity. The extensive porosity and dispersity of the Pd NPs made the active sites readily accessible, and led to efficient mass transfer. Thus, Pd@PC-POP exhibits superior catalytic performance in catalytic reduction of various nitroarenes. Furthermore, Pd@PC-POP has excellent recyclability, without significant loss of activity nor leaching of Pd active sites during 10 successive reaction cycles. This work points to a practical and cost-effective approach to preparation of POP materials, and also for confining ultra-fine NMNPs in POPs for use as catalysts.
研究领域:
材料科学
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催化化学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qiaoqi Li,Fei Wang,Xiaoyan Liu,Wenhao Xu,Keyi Zhang,Siyuan Zhang,Pengfei Teng,Lili Zhang
Green processing of steel slag and lithium-ion battery liquid waste poses a global environmental challenge. This study utilizes waste acid (containing Co 2+ , H + and NO 3 – ) and alkali solutions (containing Li + , Na + , OH – and CO 3 2– ) from lithium-ion battery manufacturing to recover metal cations from steel slag (containing Ca 2+ , Mg 2+ , Al 3+ , Fe 3+ , and Mn 2+ ), preparing high-entropy CoCaMgMnAlFe-LDHs catalysts for controllable hydrogen generation via NaBH 4 hydrolysis. The ultimate residue, without any residual hazardous metal cations, enabling safe reintroduction into the natural environment. The presence of Co 2+ endows the CoCaMgMnAlFe-LDHs catalyst with rapid photo-thermal conversion capability, enabling it to rapidly heat up under infrared radiation and efficiently catalyze the reaction of NaBH 4 hydrolysis. The hydrogen generation rate reaches 1.12 mol·h −1 ·g −1 ·W −1 driven by 1050 nm infrared radiation. This study provides a novel approach to the environmentally friendly treatment and high-value utilization of steel slag and lithium-ion battery liquid waste.
研究领域:
环境科学
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材料科学
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能源科学
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高影响因子
FOOD CHEMISTRY
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2021
·
IF 7.514
Zhisong Wang,Zhujun Zhang,Shaopeng Li,Xianglong Zhang,Menglei Xia,Ting Xia,Min Wang
Melanoidins, are of increasing interest for their potential biological activities. However, little knowledge is available on their structure. In the present study, vinegar, coffee and model melanoidins were degraded by NaBH 4 , and the resultant reaction products were characterised by chromatography, mass spectrometry and spectrometry methods to elucidate the mechanism of formation of melanoidin skeleton molecules. The study identified a typical polymer with a molecular weight (MW) interval of 74 Da, which was polymerised by aldol condensation and reduced by NaBH 4 , followed by intermolecular dehydration. MW of the theoretically derived typical polymers matched the detected polymers, validating the speculated pathway involved in the formation of melanoidins skeleton molecules. The study also revealed that melanoidins from different sources contain polymers with the same MW and different binding preferences, contributing to the heterogeneity of melanoidins. Overall, these findings indicated that the identified polymers could be used as potential candidate biomarkers for melanoidins.
研究领域:
食品科学
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分析化学
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生物化学
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Ge Ma,Qi Xue,Jingyi Zhu,Xiaoyu Zhang,Xin Wang,Hongchang Yao,Guofu Zhou,Yu Chen
Heterostructured noble metal/transition metal nanohybrids have attracted increasing attention in energy/environment-related electrocatalysis field due to their high activity. In this work, the ultrathin NiO nanosheets (NiO-NSs) decorated with ultrafine Rh nanocrystals (Rh-NCs) electrocatalyst (termed as Rh-NCs/NiO-NSs) is successfully synthesized by using mixed-cyanogels-NaBH 4 method and succedent heat treatment. Physical characterizations confirm that as-prepared Rh-NCs/NiO-NSs have 1.6 nm thickness and a large specific surface area of 166.2 m 2 g −1 , and ultrafine Rh-NCs are uniformly dispersed on surface of NiO-NSs. Electrochemical measurements show that the incorporation of Rh-NCs can promote the generation of Ni III OOH species and accelerate the oxidation of CO, thus significantly improving the electrocatalytic performance of NiO-NSs for urea electro-oxidation reaction (UEOR). The UEOR current at Rh-NCs/NiO-NSs achieves the 616 mA mg −1 at 1.55 V potential, which is 11.5 times bigger than that at NiO-NSs in 1 M KOH solution with 0.33 M urea. Additionally, Rh-NCs/NiO-NSs also show excellent long-term stability due to improved structural/chemical stability and anti-poisoning capability.
研究领域:
电化学
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材料科学
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纳米技术
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催化
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高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2020
·Vol. 30
·期 11
·4350-4360
·
IF 1.941
Zhang Zhihua,Peng Xinke,Zhang Zhongping,Xiao Weiming,Deng Shengjun,Mao Xuejin,Hong Sanguo,Chen Chao,Zhang Ning
Metal–organic framework (MOF) supported nanocatalysts are attracting great attentions in heterogeneous catalysis. However, they are still less explored and poorly understood in catalyzing solid–gas reactions. In current work, two MOF supported Pt nanocatalysts were prepared by immersion method coupled with the most commonly used NaBH 4 (Pt/UiO-66-NaBH 4 ) and H 2 (Pt/UiO-66-H 2 ) reduction, and their catalytic CO oxidation performances were investigated. NaBH 4 and H 2 reduction both provide highly dispersed Pt/UiO-66 nanocatalysts, and the two prepared catalysts display excellent CO oxidation activities. Moreover, CO oxidation durability tests reveal that Pt/UiO-66-NaBH 4 shows superior durability and structure stability, which are much better than those of Pt/UiO-66-H 2 . The high structure stability of Pt/UiO-66-NaBH 4 also endows it with good H 2 O and CO 2 tolerance. This work attempts to elucidate the influence of reduction methods on the structures and catalytic CO oxidation performances of Pt/UiO-66 catalysts by employing XRD, TEM, N 2 -sorption, XPS and in situ DRIFTS techniques. Furthermore, the mechanism of CO oxidation was studied by in situ DRIFTS, and the result reveals that the CO oxidation on the two catalysts follows different mechanism.
研究领域:
催化化学
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材料科学
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高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Zhisong Wang,Shaopeng Li,Zhujun Zhang,Xianglong Zhang,Ting Xia,Yu Zheng,Menglei Xia,Min Wang
To decipher the formation mechanism of nitrogen-free substructures in melanoidins, methylglyoxal or 3-deoxyglucosone was used as a substrate to react by aldol reaction under different pH conditionst. The obtained products were characterised by chromatography, mass spectrometry, and spectroscopic methods. Overall, the molecular weights of the polymers structural units varied mainly within 54–56 and 72–74 Da, respectively, due to the different dehydration extent of β-hydroxy aldehyde or ketones, and uneven reduction by NaBH 4 . Moreover, the nitrogen-free substructures formed by this reaction can cross-link with gluten and dextran to form melanoidins. Therefore, the nitrogen-free substructures by this reaction to formed with units of 54–56 and 72–74 Da, which are similar as the typical polymers in food melanoidins. It is inferred that the typical polymers in food may also be formed by this pathway and which can be used as a detectable biomarker in melanoidins.
研究领域:
食品化学
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分析化学
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有机化学
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高影响因子
危险品化学品经营许可证（带存储）