JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 141
·期 2
·e54774
·
IF 3
Wenyu Zhang,Yu Zhang,Weijie Cai,Dazhi Wang,Shaoyin Zhang
2,2,6,6-Tetramethylpiperidinium-nitroxide (TEMPO) is a mild and efficient catalyst, which is important in the industrial production of selective oxidation of alcohols to the corresponding aldehyde or ketone compounds. However, it is a challenge to recover the expensive TEMPO catalyst in homogeneous catalytic systems. In this study, a novel polymer-supported catalyst was prepared using 4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxy (4-OH-TEMPO) and polyaromatic ether sulfone (PAES). The successful grafting of 4-OH-TEMPO in PAES-C was demonstrated by 1 H nuclear magnetic resonance ( 1 H NMR) and Fourier transform infrared (FT-IR), load capacity can be calculated by elemental analysis (EA). BET and scanning electron microscopy (SEM) to depict the structure-performance relationship. Herein, SEM images revealed the existence of porous structure. This structure can effectively adsorb NO molecules to form a PAES-TEMPO/NO x catalytic system to selectively oxidize benzyl alcohol. The experimental results indicated the high activity, the subsequent benzyl alcohol oxidation cycle can reach more than 93% conversion without showing a large loss of selectivity. More importantly, the as-prepared catalyst exhibited the attractive recyclability (recovery rate is 98%). After 10 consecutive runs, no significant loss of conversion and selectivity was observed (the conversion rate of benzyl alcohol was more than 93% and the selectivity was more than 95%). This study might provide some recommendation on the development of highly efficient catalysts for alcohol oxidation.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Jing-He Yang,Xiuhong Xu,Miaomiao Chen,Duo Yang,Hongye Lu,Yazhou Sun,Can Shao,Qiangqiang Song,Jie Zhang,Li Gao,Yatao Zhang
The establishment of non-noble metal electrocatalysts with controllable morphology is crucial significance for overall water splitting. Ni-based catalyst is perceived as a promising electrocatalyst due to its excellent oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) performance. Herein, β-Ni(OH) 2 /NF is designed for OER and HER, using a facile hydrothermal etching method. The separation rate of hydroxide is controlled by the copper-ammonium complexation reaction, and the different amounts of oleic acid is added as a protective agent to regulate the surface morphology of the Ni foam. The ingenious combination of several reactants allows us to synthesize different morphology catalysts, and get the best performance from them. The catalyst exhibits superior OER and HER electrocatalytic performance, which overpotential is 329 mV during the OER and 170 mV for the HER at 50 mA cm −2 . Meanwhile, it demonstrates small Tafel slopes of 51 mV dec −1 for HER and 40 mV dec −1 for OER in 1.0 M KOH solution. Moreover, the catalyst presents a stable activity with no significant attenuation after 24 h OER and HER reaction. The hydrothermal etching method is expected to offer an adjustable synthetic strategy for the reasonable design of highly efficient, durable and non-noble-metal bifunction catalysts.
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POWDER TECHNOLOGY
·
2021
·
IF 5.134
Chendong Zhang,Hangchen Li,Xinxin Guo,Shunchao Li,Han Zhang,Xuhai Pan,Min Hua
A new type of dry powder fire extinguishing agent was prepared, which was called composite superfine dry powder with Aluminum Trihydrate (CSFP-ATH). The CSFP-ATH was characterized by laser particle size analysis , scanning electron microscope (SEM), thermal gravity analyzer (TGA), transform infrared spectroscopy(FTIR) analyzer and differential scanning calorimetry (DSC). The extinguishing performance of different samples was examined in a small-scale experimental platform for the liquid hydrocarbon fire. The tests were proved that the fire-extinguishing performance was as follows: CSFP-ATH > superfine ABC dry powder(SFP) > commercial ABC dry powder(CDP). Besides, the mechanism, kinetics and thermochemical changes in the reaction process were calculated by Gaussian simulation, and the reaction path of the CSFP-ATH with free radicals in the flame was predicted. Experimental and theoretical studies have been proved that the addition of Al(OH) 3 can promote the fire extinguishing performance of superfine ABC dry powder.
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RSC Advances
·
2021
·Vol. 11
·期 43
·26502-26508
·
IF 3.361
Meirong Fu,Mingqiang Li,Yingying Zhao,Yunxiang Bai,Xingzhong Fang,Xiaolong Kang,Min Yang,Yanping Wei,Xia Xu
Precious metal nanometric catalysts are widely used in the removal of harmful substances. In the process of synthesis and catalytic reaction, it is particularly important to study green and simple synthesis methods and high catalytic efficiency. In this paper, a green one-step method was used to synthesize the Fe(OH)3/Fe2O3@Au composite catalyst, in which Au was single atom-dispersed. The removal of 4-nitrophenol (4-NP), a typical dangerous chemical widely existing in factory waste gas, waste water and automobile exhaust gas, was catalysed by Fe(OH)3/Fe2O3@Au. The catalytic performance of Fe(OH)3/Fe2O3@Au with different synthesis conditions (different amounts of MES, NaBH4, FeSO4, Au and Pt) on the 4-NP reduction reaction were systematically studied. Finally, the stability and recyclability of Fe(OH)3/Fe2O3@Au composite nanocatalyst were investigated thoroughly.
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JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
·
2021
·Vol. 29
·期 7
·1063-1072
·
IF 1.263
Sun Qian,Wang En-hui,Hou Xin-mei,He Zhi-jun,Liang Tong-xiang
Calcium aluminate cement (CAC) is widely used as a binder for refractory materials, and thus the improvement in compressive strength is of vital importance for CAC applied at high temperature. For this purpose, nano-Ca 10 (PO 4 ) 6 (OH) 2 additive with a ratio of 0.5–1.5 mass% was added with the water-cement ratio to be 0.4. X-ray diffraction and isothermal calorimetry analysis demonstrate that nano-Ca 10 (PO 4 ) 6 (OH) 2 additive can shorten the hydration process and promote the formation of main hydrates of CaAl 2 O 4 ·10H 2 O (CAH 10 ) and Ca 2 Al 2 O 5 ·8H 2 O (C 2 AH 8 ). In addition, scanning electron microscopy results suggest that nano-Ca 10 (PO 4 ) 6 (OH) 2 can protect CAH 10 and C 2 AH 8 from being destroyed during the calcination, guaranteeing that these thin lamellar crystals are intertwined to form the denser microstructure. Benefited from above effects, nano-Ca 10 (PO 4 ) 6 (OH) 2 can obviously improve the compressive strength of the CAC mortar samples cured for 7 d after calcination at 1100 °C, while the improving effect is dependent upon its contents. Especially, compared with the one without the additive, the compressive strength of the sample with 1.0% nano-Ca 10 (PO 4 ) 6 (OH) 2 is increased by 14%.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Fang Li,Huijie Ma,Chensi Shen,Yuting Pan,Yaopeng Zhang,Yanbiao Liu,Chenye Xu,Deli Wu
Persulfates are the concerned oxidants in the advanced oxidation processes recently. Besides, persulfates with higher concentrations can initiate the free radical crosslinking of the polymeric chain, which is considered as one of the solutions for the pollution control of soluble polymers. In this study, the combination of free radical crosslinking and oxidation initiated by a thermally activated persulfate system was used to simultaneously remove polyvinyl alcohol (PVA) and the coexisting organic pollutants, i.e. dyes. Especially, the catalyst-like function of PVA could accelerate the production of OH radicals via the elimination of −OH groups. It can promote the crosslinking itself and facilitate the degradation of coexisting pollutants. Given initial COD and PVA concentrations of 14406.0 mg/L and 8063.2 mg/L, respectively, a maximum of 93.6 % COD and 98.4 % PVA was removed under the optimal conditions. Meanwhile, the PVA with high concentration did not have negative effects on the degradation of coexisting pollutants.
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CRYSTENGCOMM
·
2020
·Vol. 22
·期 30
·5067-5072
·
IF 3.117
Kuan Deng,Feifei Wang,Wen Tian,Zhufeng Hu,Hualian Zhang,Kui Ma,Caihong Wang,Hairong Yue,Yu Xin Zhang,Junyi Ji
Hierarchical Co-doped SnS2@Ni(OH)2 double-shell nanosheet arrays are coated on carbon cloth via a two-step solvothermal method. The vertically aligned and ultrathin nanosheet arrays with gradient pore distribution and hydrophilic nature can facilitate electrolyte infiltration and avoid the “dead volume,” while the densely-packed SnS2 array with high intrinsic electrical conductivity can bridge carbon cloth and Ni(OH)2 to improve electron transfer. The SnS2@Co–Ni(OH)2/CC-3 electrode can achieve high areal capacitance (5.41 F cm−2 at 1 mA cm−2), good rate capability, and cyclic stability (93.92% capacitance retention after 5000 cycles) in a three-electrode system. Moreover, an asymmetric supercapacitor (ASC) device is fabricated with the help of SnS2@Co–Ni(OH)2/CC composites and activated microwave-exfoliated graphene oxide, which achieves the highest energy density of 57.2 W h kg−1 and a maximum power density of 8.0 kW kg−1.
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JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Guichao Liu,Xue-Zhi Song,Shenpeng Zhang,Xi Chen,Sihang Liu,Yulan Meng,Zhenquan Tan
Rational architecture design and ingenious electrochemical performance optimization are highly desirable in developing high-performance asymmetric supercapacitors . Herein, a facile electrodeposition strategy is adopted to construct the hierarchical core-shell architecture of binary transitional metal hydroxide nanosheets anchored on copper foam ( CF) supported three-dimensional (3D) CuO scaffolds. The synergistic contributions from different electro-active components are maximized by the heterostructures construction and components optimization. As a result, the 3D binder-free electrode of CF supported CuO@Zn 1 Co 2 -OH core-shell heterostructure achieve a high areal capacitance of 2.634 F cm −2 at 5 mA cm −2 , enhanced rate performance (71.6% retention at 30 mA cm −2 ), and long durability (99.1% after 4000 cycles). Additionally, a CuO@Zn 1 Co 2 –OH//LSDC (loofah sponge derived carbon) asymmetric supercapacitor (ASC) is assembled with an operating voltage of 1.5 V. The ASC device delivers a maximum energy density of 0.21 mW h cm −2 (22.10 W h kg −1 ) at a power density of 4.08 mW cm −2 (434 W kg −1 ), and exceptional cycling stability (91.7% of capacitance retention after 4000 cycles). Of practical importance, this work broadens our horizons in fabricating novel hierarchical core-shell heterostructures for next-generation electrochemical energy-storage technologies.
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Journal of Environmental Sciences
·
2021
·
IF 5.565
Yanqing Zhou,Yili Wang,Shuoxun Dong,Haotian Hao,Junyi Li,Chenyang Liu,Xiaolin Li,Yao Tong
Cationic hydrogels have received great attention to control eutrophication and recycle phosphate. In this study, a type of La(OH) 3 loaded magnetic MAPTAC-based cationic hydrogel (La(OH) 3 @MMCH) was developed as a potential adsorbent for enhanced phosphate removal from aqueous environment. La(OH) 3 @MMCH exhibited high adsorption capacity of 105.72±5.99 mg P/g, and reached equilibrium within 2 hr. La(OH) 3 @MMCH could perform effectively in a wide pH range from 3.0 to 9.0 and in the presence of coexisting ions (including SO 4 2− , Cl − , NO 3 − , HCO 3 − , SiO 4 4− and HA). The adsorption-desorption experiment indicated that La(OH) 3 @MMCH could be easily regenerated by using NaOH-NaCl as the desorption agent, and 73.3% adsorption capacity remained after five cycles. Moreover, La(OH) 3 @MMCH was employed to treat surface water with phosphate concentration of 1.90 mg/L and showed great removal efficiency of 95.21%. Actually, MMCH showed high surface charge density of 34.38-59.38 meq/kg in the pH range from 3.0 to 11.0 and great swelling ratio of 3014.57% within 24 h, indicating that MMCH could produce the enhanced Donnan membrane effect to pre-permeate phosphate. Furthermore, the bifunctional structure of La(OH) 3 @MMCH enabled it to capture phosphate through electrostatic attraction and ligand exchange . All the results prove that La(OH) 3 @MMCH is a promising adsorbent for eutrophication control and phosphate recovery.
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Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 28
·13668-13675
·
IF 9.931
Hongtao Guan,Pan Cai,Xiaomeng Zhang,Yanlin Zhang,Gang Chen,Chengjun Dong
We demonstrate the design and fabrication of novel Cu2O@Mn(OH)2 core–shell hierarchical structures using octahedral Cu2O as a template. The Cu2O backbone supports the growth of an ultrathin Mn(OH)2 nanoflake shell, leading to a relatively large surface area (65.8 m2 g−1) for sufficient utilization of active materials. Cyclic voltammetry (CV) and galvanostatic charge–discharge measurements (GCD), as well as cycling stability and electrochemical impedance spectroscopy (EIS) were performed to examine the electrochemical performances of the Cu2O@Mn(OH)2 core–shell structure. Applied as a supercapacitor electrode, the Cu2O@Mn(OH)2 composite delivers a high specific capacitance of 540.9 F g−1 at 1 A g−1 and an energy density of 6.4–18.2 Wh kg−1. After conducting 3000 cycles at 5.0 A g−1, the capacitance retention of 71.5% was achieved. The unique core–shell structure of the Cu2O@Mn(OH)2 composite favours the effective transport of electrolytes and shortens the ion diffusion path. In addition, the synergetic effects from both Cu2O and Mn(OH)2 significantly enhance the electrochemical performances. Our findings suggest that this Cu2O@Mn(OH)2 core–shell is very promising for next generation high-performance supercapacitors.
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Frontiers in Chemistry
·
2018
·
IF 4.155
Li Yinong,Tian Chen,Liu Weizhen,Xu Si,Xu Yunyun,Cui Rongxin,Lin Zhang
Nano-Mg(OH)2 is attracting great attention as adsorbent for pre-concentration and recovery of rare earth elements (REEs) from low-concentration solution, due to its superior removal efficiency for REEs and environmental friendliness. However, the nanoparticles also cause some severe problems during application, including aggregation, blockage in fixed-bed column, as well as the difficulties in separation and reuse. Herein, in order to avoid the mentioned problems, a carbon cloth (CC) supported nano-Mg(OH)2 (nano-Mg(OH)2@CC) was synthesized by electrodeposition. The X-ray diffraction and scanning electron microscopy analysis demonstrated that the interlaced nano-sheet of Mg(OH)2 grew firmly and uniformly on the surface of carbon cloth fibers. Batch adsorption experiments of Eu(III) indicated that the nano-Mg(OH)2@CC composite maintained the excellent adsorption performance of nano-Mg(OH)2 toward Eu(III). After adsorption, the Eu containing composite was calcined under nitrogen atmosphere. The content of Eu2O3 in the calcined material was as high as 99.66%. Fixed-bed column experiments indicated that no blockage for Mg(OH)2@CC composite was observed during the treatment, while the complete blockage of occurred to nano-Mg(OH)2 at an effluent volume of 240 mL. Moreover, the removal efficiency of Mg(OH)2@CC was still higher than 90% until 4,200 mL of effluent volume. This work provides a promising method for feasible application of nanoadsorbents in fixed-bed process to recycle low-concentration REEs from wastewater.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2018
·Vol. 89
·期 2
·492-499
·
IF 1.745
Wang Li,Li Jing,Wang Meiri,Liu Yuanyuan,Cui Hongtao
Abstract 2D nanostructured Co 2+ -doped β-Ni(OH) 2 as electrode material for application in redox-type supercapacitors was synthesized by a strategy of nickel complex template. The 2D Co 2+ -doped β-Ni(OH) 2 was produced by the in situ reaction of 2D Co 2+ -doped template in strong alkaline electrolyte solution during electrochemical measurement. Due to the large interface and the promoted conductivity induced by Co 2+ doping, the Co 2+ -doped β-Ni(OH) 2 exhibited high electrochemical performance. It had high specific capacitance of about 2100 F g –1 at low current density of ~2 A g −1 . It also exhibited excellent high rate performance (1259 F g –1 at high current density of 41.7 A g −1 ), much higher than the undoped sample. The results in this work indicated that the Co 2+ -doped β-Ni(OH) 2 could be used as an effective electrode material in redox supercapacitors.
2D nanostructured Co 2+ -doped β-Ni(OH) 2 as electrode material for application in redox-type supercapacitors was in situ synthesized by a strategy of nickel complex template. Due to the large interface and the promoted conductivity induced by Co 2+ doping, the as-synthesized material exhibited excellent high rate electrochemical performance.
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