CHEMICAL PHYSICS LETTERS
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2019
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IF 1.901
Zhuo Zhou,Haiming Xu,Dongya Li,Zhongwei Zou,Dongsheng Xia
La(OH) 3 /BiOCl n-n heterojunction (BCL) was successfully fabricated by facile microwave technique. Photocatalytic performance experiments confirmed that BCL-20 can degrade 20 mg/L tetracycline hydrochloride (TC-HCl) about 85% in 60 min, which is 2 and 0.5 times higher than that of BiOCl and La(OH) 3 , respectively. The photocatalytic mechanism reveals that the co-effect of oxygen vacancies (OVs) and rebuilt internal electric field induced by heterostructure not only broaden the light-responsive range but also augment the separation efficiency of photogenerated carriers, thus improving the photocatalytic properties of BCL. This work provides a new avenue for improving the photocatalytic performance of Bi-based photocatalysts by heterojunction and OVs.
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DALTON TRANSACTIONS
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2022
·Vol. 52
·期 6
·1680-1686
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IF 4.569
Xinyao Ding,Mingyi Zhang,Xin Chang,Xuejiao Zhou
The energy industry is placing more and more emphasis on the need for effective and affordable electrocatalysts for hydrogen evolution reactions (HER). In this work, an iron-doped NiS/Ni(OH)2/CC composite material was synthesized by simple hydrothermal sulfurization processes of bimetallic Prussian blue analogue (PBAs) precursors grown in situ on three-dimensional (3D) Ni(OH)2 nanosheets. The overpotential can be 103 mV to attain current densities of 10 mA cm−2. The excellent catalytic activity of Fe-NiS/Ni(OH)2/CC is because of the unique 3D structure and the uniform doping of iron caused by the in situ growth of PBA, as well as the high conductivity of the self-supported electrode carbon cloth.
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INORGANIC CHEMISTRY
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2022
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IF 5.436
Min Chen,Zhengli Liang,Xiaoxiao Wang,Jiehua Li,Xingguo Chen,Xingxing Jiang,Zheshuai Lin,Zhen Ma,Hongming Liu
A series of lanthanide-containing water-resistant nitrates, namely RE(OH)2NO3 (RE = Tb(1), Dy(2), Ho(3), and Er(4)), was obtained through the hydrothermal process. As possible nonlinear optical materials, they feature a layered isomorph composed of an [REO3(OH)6] polyhedron and an [NO3] triangle, and the synergistic arrangement of the [REO3(OH)6] and [NO3] groups in their structures leads to their obvious second-order nonlinear optical effect. Nevertheless, the unique optical absorption caused by the electronic transitions on 4f–4f orbitals of lanthanides results in their second harmonic generation responses of different strengths, with 1 exhibiting 5.07 times that of KDP, but 2–4 showing less than half of KDP. In addition, 1 possesses an outstanding water-resistant capacity and a transparent cut-off edge around 300 nm, foreshadowing its potential value as a nonlinear optical crystal. Moreover, 1 is found to emit characteristic green fluorescence due to the typical 5D4 → 7F5 transitions of the excited Tb3+ ions
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Zhijia Liao,Zhenyu Yuan,Hongliang Gao,Fanli Meng
In response to the pressing demand for acetic anhydride gas detection, this study introduces a novel gas sensor for precisely detecting acetic anhydride concentrations. The optimum conditions for the synthesis of cobalt hydroxyfluoride/cobalt oxide (CHFCO) heterojunctions with good acetic anhydride gas sensitivity were determined by carefully adjusting the calcination time, hydrothermal time and ammonium fluoride content. The best performing composite CHFCO sensor with porous rod particles was tested at 180 ℃ and achieved a response rate of 260 for 100 ppm acetic anhydride gas, with response and recovery times of 60 and 40 s, respectively. In comparison to other prepared sensors, the detection response for acetic anhydride was improved by a factor of 4.30–23.63. Moreover, the CHFCO sensor reliably detected acetic anhydride at a concentration of 500 ppb, exhibiting a response value of 1.56. Notably, the sensor demonstrated great selectivity, moisture resistance , and stability. The findings highlight the significant enhancements in gas-sensitive performance to acetic anhydride achieved by the abundant hydroxyl bonds on the surface of CHFCO heterojunction, the presence of fluorine ions , and the modulation of the band gap. These results provide valuable insights for the advancement of acetic anhydride gas sensors based on CHFCO heterojunction.
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ACS Sustainable Chemistry & Engineering
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2023
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IF 8.4
Sitong Liu,Guangmin Ren,Xiangchao Meng
A BrO3–-modified Bi2O3/Bi(OH)3 heterojunction photocatalyst was in situ fabricated by a facile one-pot method and applied in photocatalytic nitrogen fixation. In comparison with Bi(OH)3, the Bi2O3/Bi(OH)3 heterojunction has a larger specific surface area from the nanoflower-like morphology and an extended visible light absorption range. Of special importance, the proper band gap match between Bi(OH)3 and Bi2O3, the multiple charge transfer channels via the BrO3– bridge, and the oriented electron migration in the type-II heterojunction mechanism make a stronger charge separation efficiency. Therefore, the BiO/BiHO-3 sample presented the highest photocatalytic nitrogen reduction performance with an ammonia production rate of 45.28 μmol g–1 h–1, which was 10 times higher than that of Bi(OH)3. Photogenerated cavities are consumed during H2O oxidation to produce O2 and H2O2. However, the O2 production was small, and the H2O2 yield was about 78.5 μmol g–1 h–1. For CO2 reduction, the CO production rate was 52.86 μmol g–1 h–1, which was 1.6 and 1.9 times those of Bi(OH)3 and Bi2O3. This work provides useful guidance for the design and synthesis of efficient catalysts for photocatalytic N2 fixation.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Weiwei Yang,Mao Peng,Ye Lv,Mengya Sun,Jinli Zhang,Wei Li,Yan Fu
2-Hydroxybenzaldehyde (SALD) exhibits special reactivity in various chemical reactions due to the existence of aldehyde and hydroxyl groups, which also make it a challenge to achieve high conversion and selectivity for SALD production. Herein, β-Ni(OH) 2 nanosheets over nickel foam (NF) at different hydrothermal temperatures were synthesized for electrocatalytic oxidation (ECO) of 2-hydroxybenzyl alcohol (SAL) into SALD. The β-Ni(OH) 2 electrode obtained at 160 °C achieves the best ECO performance in 2.5 M KOH at the applied potential of 1.45 V (RHE), showing the SALD selectivity of 78.90% and the Faradaic efficiency of 87.94% at the SAL conversion of 69.76%. ECO of SAL reduces the cell voltage and boosts the hydrogen productivity by 2.74 times. It is of great importance to find that potential-driven surface reconstruction of β-Ni(OH) 2 enables selective conversion of SAL into SALD. Side reactions including OER as well as oxidation of phenolic group can be effectively controlled via regulating applied potentials on β-Ni(OH) 2 . This work is the first report on direct electrochemical oxidation of SAL with high SALD selectivity, and offers a green and clean strategy for highly selective production of SALD under mild conditions.
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INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
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2023
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IF 3.3
Haijun Chang,Yuanwei Shi,Jie Xiong,Zhaoying Bo,Yan Dai
Summary This study investigated the effects of the combination of Gaphalium affine extract (GAE) and sodium pyrophosphate (PP) on the structure and oxidative stability of porcine myofibrillar proteins (MPs) under oxidative stress. The results showed that GAE was rich in total flavonoids and total phenols (37.09% and 67.50%, respectively). GAE had strong free radical scavenging ability, especially for • OH, and the semi-inhibitory concentration (IC 50 ) of • OH reached as high as 3.59 μg/mL, which was slightly lower than that of the standard antioxidant vitamin C (V c ). The addition of GAE and PP significantly inhibited the formation of carbonyl groups compared to the control group ( P < 0.05). The presence of GAE further promoted the loss of total sulphydryl groups by 3.52% compared to the oxidative control group ( P < 0.05). However, PP and PP+G significantly inhibited the loss of total sulphydryl groups ( P < 0.05). The further reduction in the carbonyl content, increase in the hydrogen bond content, inhibition of the conversion of sulphydryl groups to disulphide bonds, and decrease in the cross-linking aggregation of corresponding proteins all indicate that GAE and PP could cooperatively regulate the oxidation of MPs. An appropriate amount of PP effectively modified the damage caused by GAE on both the secondary and tertiary structure of MPs to maintain their structural stability, however, a relatively higher concentration of PP led to a substantial degree of MP collapse and affected the quality of the proteins. These results suggest that the oxidative stability of MPs can be improved by the addition of an appropriate amount of GAE (0.2 mg/g protein) combined with PP (1 mM).
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2023
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IF 4
Zong-Bao Yu,Zhuozhuo Song,Peng Zheng,Jie Sun,Zhanxu Yang
Transition metal sulfides (TM sulfides) has long been regarded as highly promising materials for catalyzing oxygen evolution reaction (OER). The function of TM sulfides in OER occurs on TM oxyhydroxide and SO 4 2− , which are formed through surface reconstruction under certain potentials. It is worth noting that the impact of SO 4 2− on the local charge distribution among atoms, a crucial determinant of OER performance, has been insufficiently studied. This study aims to investigate the role of SO 4 2− in mediating the partial redistribution of charges among Co, Ni and O atoms on a precatalyst Co 9 S 8 /C–Ni(OH) 2 electrode. The electrode undergoes self-reconstruction to form a CoOOH/SO 4 2− /NiOOH structure on its surface that is active for the OER. The results demonstrate that SO 4 2− facilitates the local charge redistribution of active atoms, leading to optimized adsorption energy of OER intermediates and increased redox center of the material. Furthermore, SO 4 2− serves as an electron mediator in the OER process under varying applied voltages. Consequently, CoOOH/SO 4 2− /NiOOH achieves a Tafel slope of 56 mV dec −1 , an overpotential of 250 mV, and maintains a high stability for over 100 h at a current density of 20 mA cm −2 . Overall, this research provides valuable insights into catalytic reaction mechanisms and the design of efficient composite catalysts.
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POWDER TECHNOLOGY
·
2023
·
IF 5.2
Yuxiang Cheng,Zhongjie Shen,Feng Lv,Dayang Wan,Yongchuan Gao,Yiru Yang,Haifeng Lu,Zhenghua Dai,Haifeng Liu
During the Ca(OH) 2 /CaO thermochemical energy storage process, the cyclability of reactions and the consolidation properties of powder storage are important issues to consider. In this study, experiments were conducted to assess the evolution of reaction conversion, particle size and penetration resistance of Ca(OH) 2 /CaO powder fixed bed. The results revealed that the final conversions of both the hydration and dehydration reactions stabilized between 70 and 80%. The particle size distributions of Ca(OH) 2 increased initially and then decreased with the increasing cycle number and degree of dehydration. The dehydration conversion was the dominant factor for changing Ca(OH) 2 bed penetration resistance force. The particle size and penetration resistance of the CaO bed remained stable during long-term storage at high temperatures. The theoretical analysis of the inter-particle forces agreed with the trend of the experimental results, with particle size and moisture content being the main factors affecting cohesion.
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ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Sirong Li,Yipeng Zhang,Xin Yu,Zhenlong Wang,Guofei Zhang,Zhengyi Zhao,Zhiyong Yan,Xuechun Xiao
An environmentally friendly method of producing hydrogen is electrocatalytic water splitting, but the high theoretical potential of the anode's OER (1.23 V vs. RHE) restricts the efficiency of hydrogen production . Therefore, using the urea oxidation reaction (UOR, theoretical potential of 0.37 V vs. RHE) in place of the OER can significantly increase the efficiency of hydrogen production. Here, we grow the hydroxide layer of Ni-Co-Fe directly on NF by one-step electrodeposition and obtain the best catalyst by regulating the elemental ratio of Co and Fe. Through tests, it is found that NiCoFe(OH) x /NF(Co: Fe=3: 1) exhibits the best electrocatalytic performance, and the required potential is only 1.24 and 1.30 V when the current density reaches 10 and 50 mA cm −2 in the UOR process, which is 170 and 140 mV lower than the OER overpotential under the same conditions, showing a more advantageous anodic catalytic effect. At the same time, integral water decomposition in an electrolyte of 1 M KOH adds with 0.5 M urea also shows more favorable catalytic activity and stability. The NiCoFe(OH) x /NF(Co: Fe=3: 1) plays an important role in improving the efficiency of hydrogen production by water splitting through simple electrodeposition, and has sustainable development prospects.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2023
·
IF 8.7
Zuozhu Yin,Min Li,Zihao Li,Yuanting Deng,Mingshan Xue,Yuhua Chen,Junfei Ou,Sheng Lei,Yidan Luo,Chan Xie
Traditional membranes are inefficient in treating highly toxic organic pollutants and oily wastewater in harsh environments, which is difficult to meet the growing demand for green development. Herein, the Co(OH) 2 @stearic acid nanocellulose-based membrane was prepared by depositing Co(OH) 2 on the nanocellulose-based membrane (NBM) through chemical soaking method, which enables efficient oil/water mixtures separation and degradation of pollutants by photocatalysis in harsh environments. The Co(OH) 2 @stearic acid nanocellulose-based membrane (Co(OH) 2 @stearic acid NBM) shows good photocatalytic degradation performance for methylene blue pollutants in harsh environment, and has significant degradation rate (93.66%). At the same time, the Co(OH) 2 @stearic acid NBM with superhydrophobicity and superoleophilicity also exhibits respectable oil/water mixtures separation performance (n-Hexane, dimethyl carbonate, chloroform and toluene) under harsh environment (strong acid/strong alkali), which has an excellent oil-water mixtures separation flux of 87 L·m −2 ·h −1 (n-Hexane/water) and oil-water mixture separation efficiency of over 93% (n-Hexane/water). In addition, this robust Co(OH) 2 @stearic acid NBM shows good self-cleaning and recycling performance. Even though seven oil-water separation tests have been carried out under harsh environment, it can still maintain respectable oil-water mixture separation rate and flux. The multifunctional membrane has excellent resistance to harsh environments, oil-water separation and pollutant degradation can be performed even in harsh environments, which provides a convenient way to treat sewage under harsh conditions efficiently and has great potential in practical application.
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Energy & Environmental Materials
·
2023
·
IF 15
Kejun Xu,Liuying Wang,Chaoqun Ge,Long Wang,Bin Wang,Zhuo Wang,Chuanwei Zhang,Gu Liu
NiO, an anodic electrochromic material, has applications in energy-saving windows, intelligent displays, and military camouflage. However, its electrochromic mechanism and reasons for its performance degradation in alkaline aqueous electrolytes are complex and poorly understood, making it challenging to improve NiO thin films. We studied the phases and electrochemical characteristics of NiO films in different states (initial, colored, bleached and after 8000 cycles) and identified three main reasons for performance degradation. First, Ni(OH) 2 is generated during electrochromic cycling and deposited on the NiO film surface, gradually yielding a NiO@Ni(OH) 2 core–shell structure, isolating the internal NiO film from the electrolyte, and preventing ion transfer. Second, the core–shell structure causes the mode of electrical conduction to change from first- to second-order conduction, reducing the efficiency of ion transfer to the surface Ni(OH) 2 layer. Third, Ni(OH) 2 and NiOOH, which have similar crystal structures but different b -axis lattice parameters, are formed during electrochromic cycling, and large volume changes in the unit cell reduce the structural stability of the thin film. Finally, we clarified the mechanism of electrochromic performance degradation of NiO films in alkaline aqueous electrolytes and provide a route to activation of NiO films, which will promote the development of electrochromic technology.
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