JOURNAL OF NANOPARTICLE RESEARCH
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2021
·Vol. 23
·期 7
·1-14
·
IF 2.253
Yu Linkang,Lin Runlian,Han Yu,Fan Dehui,Zhou Guoqiang,Zhang Jinchao,Jia Guang,Ge Kun
With the wide use of rare earth nanomaterials in industry, environmental control, and medicine with their unique properties, it has focused on the exposure of humans to the rare earth nanoparticles in recent years. Because of the similar properties of rare earth and calcium, rare earth nanoparticles can deposit in the bone and affect the osteogenic differentiation of bone mesenchymal stem cells (BMSCs). La(OH) 3 nanoparticles are widely used in the catalysis, sensor, electrode, and luminescent materials. However, there are few reports about the bioactivity of La(OH) 3 nanoparticles on the bone metabolism. In this work, three La(OH) 3 nanorods have been got by hydrothermal method, Long-, Medium-, and Short-La(OH) 3 nanorods, the lengths of which were of ~ 640, 255, and 80 nm, and the diameters of which were of ~ 85, 40, and 35 nm, respectively. All the La(OH) 3 nanorods showed no effect on BMSCs viability and the blood compatibility. But the osteogenic differentiation showed a significant difference in La(OH) 3 nanorods, in which Short-La(OH) 3 nanorods showed the highest promoting effect on osteogenic differentiation. The potential mechanism in the osteogenic differentiation caused by three La(OH) 3 nanorods was correlated with the different uptake efficiency in BMSCs and degradation in lysosome to form LaPO 4 . This work on La(OH) 3 nanorods provides the basic data for the development of lanthanum-based nanoparticles. Graphical abstract
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2021
·Vol. 127
·期 2
·1-11
·
IF 2.584
Hu Shuting,He Junfeng,Chen Fuming,Liu Bin,zhai Wangjian,He Qinyu
Constructing Z-scheme heterojunction photocatalyst with strong redox ability to make for enhanced photocatalytic performance and efficient charge separation is extremely attractive but still underdeveloped. Herein, a Z-scheme heterojunction structured La(OH) 3 @In 2 S 3 composite (labeled by “LIS”) with photocatalytic for the methylene orange (MO) degradation under simulated light irradiation has been developed. The as-prepared LIS, together with commercial La(OH) 3 and pure In 2 S 3 fabricated with the identical processing method and starting materials as those of LIS, was characterized by X-ray diffraction, UV–vis diffuse reflectance spectra, scanning electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, photoluminescence spectra and electrochemical impedance spectroscopy. The results show the heterojunction of La(OH) 3 /In 2 S 3 has prolonged the lifetime of the photo-generated carriers. The photocatalytic activity test shows that over only a small amount (0.02 g in 100 ml MO) of LIS, the photodegradation rate of 95% toward MO can be obtained in 90 min, which is about 3.4 times higher than that over pure In 2 S 3 . The active species trapping experiments indicate that there were four active species playing roles in photodegradation as the following order: e – = ∙OH < h + < ∙O 2 – . A mechanism of Z-scheme heterojunction was proposed and well explained the enhanced photocatalytic performance. This work provides a new cost-effective photocatalyst with high photocatalytic properties.
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DALTON TRANSACTIONS
·
2020
·Vol. 50
·期 1
·391-397
·
IF 4.174
Yunmei Du,Huimin Zhao,Wensi Wang,Yu Yang,Minghui Wang,Shaoxiang Li,Yanru Liu,Lei Wang
A heterogeneous structure formed by coupling two or more phases can reinforce the activity of active sites and expedite electron transfer, which is conducive to boosting its electrocatalytic activity. Herein, we designed nickel foam supported (NiCo2)Se@Ni(OH)2 (NCS@NH) heterojunction nanosheets by a two-step method. First of all, the NiCo2S4@Ni(OH)2 (NiCo2S4@NH) nanosheets coated on nickel foam were acquired via a hydrothermal method. In the selenization treatment that followed, NiCo2S4@NH was converted into NCS@NH heterogeneous nanosheets in which the selenide nanoparticles decorated on the surface of the Ni(OH)2 nanosheets formed heterojunction interfaces, and the heterogeneous structure could accelerate electron transfer, thus improving the catalytic activity. The Ni(OH)2 nanosheets can adequately contact the electrolyte and promote the decomposition of water. Meanwhile, the thickness of the Ni(OH)2 nanosheets gradually decreases with the increase of Co doping (1.5–2.5 mmol), consequently affecting the HER properties. Notably, when the amount of Co salt added is 2 mmol, NCS@NH exhibited superior HER properties (with a voltage of 253 mV at 100 mA cm−2) and excellent stability for 24 h.
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Scientific Reports
·
2020
·Vol. 10
·期 1
·1-12
·
IF 3.998
Akram Naeem,Guo Jia,Ma Wenlan,Guo Yuan,Hassan Afaq,Wang Jide
The exploration of advanced water treatment technologies e.g. heterogeneous photocatalysis is the most promising way to address organic pollution issues. Semiconductors based bimetallic photocatalysis with wide bandgap, have displayed splendid degradation performance in the UV light region, but their extension to the visible light/near infra-red region is still a matter of great concern. CuO, Co(OH) 2 , CoO and Co(OH) 2 /CuO nanocomposites were synthesized via simple co-precipitation method and further practiced for Rhodamine B (RhB) decomposition by introducing per-sulfate (PS) as a sacrificial agent. Results revealed that Co(OH) 2 /CuO catalyst had shown robust catalytic activity for RhB photodegradation (degradation time 8 min, k = 0.864 min −1 ) under light illumination, significantly less (12–60 times) than the other reported bimetallic catalysts. Catalyst also have verified excellent performance for a broader pH range (5–9) with excellent stability. Main reactive species responsible for the photocatalytic reaction were sulfate (SO 4 •− ) and superoxide (O 2 • ) radicals, duly verified by ESR and by using radical scavengers. With outstanding recycling abilities, this is probably the fewer successful attempt for RhB decolorization and can be highly favorable for effluent treatment by using the synergic effect of absorption and photodegradation.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 13
·10489-10498
·
IF 2.22
Wang Shitong,Wang Jiemei,Ji Xiang,Meng Jiaxi,Sui Yanwei,Wei Fuxiang,Qi Jiqiu,Meng Qingkun,Ren Yaojian,He Yezeng,Zhuang Dongdong
Metal hydroxide serving as a promising electrode material for the supercapacitors, has attracted considerable interests in the area of energy storage. However, the low cycling stability and electrical conductivity restrict its further application. Here, a kind of hollow-cubic Ni(OH) 2 /CuS 2 with excellent electrochemical performance has been prepared via a facile one-step sacrificial template method. The obtained Ni(OH) 2 /CuS 2 shows an outstanding specific capacitance of 1174 F g −1 at 1 A g −1 with 73.9% retention after 2000 charge–discharge cycles. Furthermore, the assembled asymmetric supercapacitors based on hollow-cubic Ni(OH) 2 /CuS 2 nanocomposite and reduced graphene oxide (RGO) exhibits a high specific energy density of 27.8 Wh kg −1 at the power density of 390 W kg −1 .
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Catalysis Science & Technology
·
2019
·Vol. 10
·期 1
·263-267
·
IF 5.726
Gang Yuan,Yujie Hu,Zihan Wang,Qiwei Wang,Li Wang,Xiangwen Zhang,Qingfa Wang
Water oxidation plays a pivotal role in energy conversion and storage such as in water splitting and metal-air batteries. The development of a highly active and stable electrode for water oxidation at a low price is greatly challenging. Here, we report a self-supported oxygen evolution reaction (OER) electrode with a 3D porous Ni foam (NF) as a core and a dense layer of amorphous phosphorus-doped Ni hydroxide (Ni–OH/P) film as a shell. This facilely fabricated 3D core–shell structured electrode with directly grown active materials offered improved activity and prolonged stability for OER. It required an overpotential of 490 mV to deliver a current density of 100 mA cm−2; it showed a small Tafel slope at 87 mV dec−1 and sustained elongated electrolysis at 100 mA cm−2 for 100 h. The NiOOH shell was in situ formed on the surface of the Ni–OH/P film. Then, a new core–shell structured film was constructed. The synergetic effects of the newly formed crystalline NiOOH shell and amorphous Ni–OH/P core contributed to high stability under harsh conditions. This work presents a facile and easy scale-up path to develop self-supported hybrid electrodes for efficient and stable energy conversion and storage.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Datong Liu,Sijie Lei,Yang Hu,Zhanguo Li,Hailing Xi,Xiaoyan Lin
Currently, bare silica nanoparticles with low surface activity and weak stabilizing foam ability have restricted applicability in treating surface radioactive pollutants. To address potential issues with SiO 2 as a foam stabilizer , a highly efficient foam stabilizer was fabricated by compounding silica with hydroxylated graphene oxide (GO-OH), which was prepared by hydrothermal modification of graphene oxide (GO). Then, an environmentally friendly foam detergent with high stability and high decontamination efficiency was developed using the natural surfactant tea saponin (TAS) as a foaming agent and a composite of silica and GO-OH (GO-OH/SiO 2 ) as a foam stabilizer, which is named tea saponin foam detergent. For different types of surfactants, the structural and morphological characteristics of GO-OH, such as hydrophilic and surface oxygen groups, as well as the synergistic influence of GO-OH with SiO 2 on foamability, foam stability, and detergency of the foam detergent, were studied. As a consequence, the TAS foam detergent has good stability with a drain half-life of 68 min. By hydrothermal modification of GO, the contact angle of water on GO-OH in air dropped to 63.2°, which was lower than that (73.0°) on GO. Furthermore, the hydrophilicity of GO-OH increased, and more oxygen-containing groups on GO-OH enhanced its absorption and enrichment of the radionuclide uranium and improved the decontamination rate of the TAS foam detergent. Moreover, when GO-OH was combined with SiO 2 , the dispersion and stability of SiO 2 in the foam detergent improved, and the foam stability of the detergent subsequently further improved. Adding 2 wt% SiO 2 and 0.1 wt% GO-OH to the detergent enhanced the foam drainage half-life of the detergent from 40 min to 68 min and improved the stability of the detergent by 70%. In addition, the synergistic action of GO-OH/SiO 2 with TAS surfactant increased the liquid film thickness of the foam and the airflow resistance to support the weight-bearing capacity of the foam skeleton. As a result, it slowed the rate of foam disproportionation , reduced the bubble size, increased the bubble number, and finally improved the foam stability of the detergent. For simulated radioactive uranium pollutants on the surfaces of glass, stainless steel , and tiles, the foam detergent with the synergistic action of GO-OH/SiO 2 and TAS surfactant had decontamination rates of 91.7%, 91.16% and 91.76%, respectively, which were 14.96%, 15.67% and 19.39% higher than that of TAS foam detergent without GO-OH/SiO 2 . The synergistic enhancement of GO-OH and SiO 2 on foam stability and its adsorption and combination action with uranyl ions would be the main reasons to improve the detergency of the TAS foam detergent. Therefore, TAS foam detergent stabilized synergistically by GO-OH/SiO 2 with high stability and efficient decontamination will be widely applied in nuclear emergencies and decommissioning decontamination of nuclear facilities.
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Analytical Methods
·
2017
·Vol. 9
·期 19
·2812-2820
·
IF 1.9
Yanyi Fu,Qinglin Sheng,Jianbin Zheng
Au nanoparticles supported on nickel hydroxide nanowires with multiple cavities (Au/m-Ni(OH)2) were synthesized and used for the enhanced electrochemical sensing of dopamine (DA). m-Ni(OH)2 nanowires were first fabricated based on an anion exchange strategy and then chosen as supports for Au nanoparticles without an additional stabilizer and surfactant. The morphology and composition of the nanocomposites were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDS). TEM observations revealed that Au nanoparticles were uniformly embedded in the cavities of m-Ni(OH)2 nanowires, with a high dispersion and a narrow size of 2 nm. Electrochemical investigations indicated that the as-prepared sensor exhibited fascinating performance towards the oxidation of DA. The linear range for DA detection was 0.45 μM to 1.78 mM with a low detection limit of 0.09 μM (S/N = 3). Additionally, the DA sensor possessed an excellent selectivity in the presence of potentially interfering substances such as ascorbic acid (AA), uric acid (UA) and glucose (Glu). Therefore, it is expected that Au/m-Ni(OH)2 nanocomposites could be used as electroactive materials for developing DA sensors.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Zewen Xu,Zhongyi Ren,Haojiang Zhu,Hao Guo,Xinliang Liu,Ming Wang,Yingfei Hou
Layer-by-layer (LBL) assembly method, with the advantages of simple operation and strong universality, has attracted much attention recently. However, the weak molecule-to-molecule and molecule-to-ion interactions have limited its development. During this work, the molecule-to-solid interaction was adopted and a robust LBL coating was achieved by alternately depositing positively charged Fe(OH) 3 colloids and negatively charged sodium alginate molecules. The molecule-to-solid interaction could continuously regenerate under corrosive conditions due to water insolubility and the chemical stability of solids. When the electrostatic interaction was broken, the abundant chemically stable solids acted as anchors to immobilize the soluble molecules and maintain the stability of the LBL coating. The prepared superwettable membranes exhibited superior oil-in-water emulsion separation efficiency, anti-fouling properties, and chemical stability. Meanwhile, the separation performance survived one week's harsh environments of strong acid and alkali.
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JOURNAL OF MOLECULAR STRUCTURE
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2022
·
IF 3.841
Wan-ping Chen,Run-quan Wang,Yue-rong Zhang,Kai Song,Yuan Tian,Jia-xian Li,Guo-ying Wang,Gao-feng Shi
In this article, the scavenging ability of hypericin on hydroxyl radicals was evaluated by UV spectra, HPLC and fluorescence spectra. The reaction mechanism of the scavenging of free radicals by hypericin was also investigated. The Gaussian calculations obtained for the spatial structure and electrostatic potential of hypericin revealed that the active site for the reaction of hypericin with hydroxyl radicals is on the phenolic hydroxyl group of hypericin. The dissociation energy, spin density and frontline orbitals of the dehydrogenated hypericin radicals yielded that hypericin 7-OH and 7′ -OH are most likely to react with hydroxyl radicals. the transition state structure, enthalpy change and Gibbs free energy change and energy change of the reaction between hypericin and hydroxyl radicals,and the results of the above calculations indicate that hypericin 7-OH and 7′ -OH have the highest activity, can be directly involved in the scavenging process of radicals, followed by 5-OH and 5′ -OH, and finally 4-OH (4′ - OH).In-depth study of the antioxidant mechanism of hypericin molecules can help to design and synthesize new antioxidants in a more rational way.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
·
IF 13.6
Jiayu Zhang,Shan Qiu,Fengxia Deng
The electro-Fenton (EF) process generates H 2 O 2 through the 2e- oxygen reduction reaction (ORR), which is subsequently activated to •OH by iron-based catalysts. To alleviate the potential risk of external Fe-based catalysts, along with metal dissolution in acidic or neutral environments, in this study we employed oxygen-doped carbon nanotubes (OCNT) as a bifunctional, metal-free cathode to establish a metal-free EF process for organic pollutant degradation. The results demonstrate that the metal-free electrode has excellent H 2 O 2 accumulation (12 mg L −1 cm −1 ) and degrades sulfathiazole (STZ) with 97.05 % efficiency in 180 min with an explanation kinetic of 0.0189 min −1 . For the first time, this enhancement came from the dual active site centers in OCNT: Ⅰ) -COOH and defects active sites were responsible for H 2 O 2 production, Ⅱ) then -C O triggered H 2 O 2 into •OH, avoiding the introduction of metal-based catalysts. These findings suggest that the EF system with in situ oxygen-doped cathodes have great potential for treating antibiotic wastewater.
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MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Qirun Wang,Yanjie Duan,Zhixiong Huang,Xiaowei Xu,Jichao Shi,Lin Lin,Sheng Han,Runping Jia,Shufang Chang,Dandan Wu
Electrocatalysts with densely exposed sites and high intrinsic activity are desired for high-efficiency oxygen evolution reaction (OER). In this paper, we report the microwave assisted solvothermal growth of NiMoO 4 nanoflowers on electrodeposited Ni(OH) 2 nanosheets , forming a high specific surface area (132.5 m 2 g -1 ) nanoflower-like NiMoO 4 /Ni(OH) 2 configuration supported on a conductive nickel foam (NF) substrate. The as-prepared NiMoO 4 /Ni(OH) 2 /NF behaved efficiently as a self-supported 3D catalyst electrode for alkaline OER, compared with commercial RuO 2 (298 mV overpotential at 10 mA cm −2 and Tafel slope of 88.6 mV dec −1 ), needing a low overpotential of 292 mV to attain 10 mA cm −2 , with a small Tafel slope of 85.0 mV dec −1 and good stability for 100 h running at 10 mA cm −2 in 1.0 M KOH. Aside from enlarged surface area for more exposed edge sites for catalysis, the modulated synergy between Ni and Mo atoms probably contributes to enhanced intrinsic activity. A more electronegative Mo increases the electron density of Ni, thus accelerating the deprotonation of intermediates and driving the transition from Ni to NiOOH, leading to modulated thermodynamics and kinetics for OER catalysis.
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