COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Wen-Juan Yan,Sheng Xu,Xian-Yao Tian,Jun-Jie Min,Shu-Cen Liu,Chi-Jie Ding,Nai-Liang Wang,Yan Hu,Qi-Xun Fan,Jiang-Shuo Li,Hong-Yan Zeng
In this paper, a functionalized layered double hydroxide (LDH-LS@Ni(OH) 2 ) flame retardant was designed and fabricated based on a multi-modifier system consisting of lignosulfonate (LS) and Ni(OH) 2 and used as a novel flame retardant for polypropylene (PP). In this multi-modifier system, LS as a compatibilizer and charring agent to improve compatibility and char yield, and Ni(OH) 2 was utilized to improve the graphitization of char residual, resulting in a PP/LDH-LS@Ni(OH) 2 composite with higher thermal stability. With the addition of LDH-LS@Ni(OH) 2 was only 15 wt%, the PP/LDH-LS@Ni(OH) 2 composite achieved a limiting oxygen index (LOI) of 30.8% and passed the UL-94 V-0 rating. At the same time, the peak heat release rate (PHRR), total heat release (THR), and total smoke production (TSP) were significantly reduced by 62.7%, 29.5%, and 46.2%, respectively. The flame retardant properties of LDH-LS@Ni(OH) 2 were mainly due to the catalytic charring effect of the transition metal elements and the physical barrier effect of the hydrotalcite. More specifically, as a highly efficient flame retardant, LDH-LS@Ni(OH) 2 has promising potential in reducing the fire hazards of PP composites.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Pu Wang,Lipin Li,Yu Tian,Li Sun,Wei Zhan,Shixuan Chen,Jun Zhang,Wei Zuo
Removal and recovery of phosphorus (P) from wastewater is beneficial to both environmental protection and resource sustainability. Enriching the low concentration of P in wastewater will greatly facilitate the effective recovery of P. To enhance the adsorption performance and recyclability of adsorbents for low concentration P-containing wastewater, a novel three-dimensional (3D) graphene/La(OH) 3 -nanorod aerogel (GLA) was prepared by a unique self-assembly process in this study. Benefiting from the large specific surface area of graphene aerogel , which provides sufficient loading sites for the favorable dispersion of La(OH) 3 nanorods, the GLA achieves an excellent P adsorption capacity of 76.85 mg/g. It is also highly selective for P, with adsorption capacity reduced by only 14% and 11% under the interference of high concentration of dissolved organic matter or multiple competing anions respectively. Further mechanistic investigation revealed that the whole adsorption process consists of three stages: (1) ion-exchange process; (2) La P inter-sphere coordination process; and (3) crystal evolution process. In the continuous flow adsorption-desorption cycles, the P concentration was concentrated ~25 times that of the feeding water (2 mg P/L). To our knowledge, this is the first time that La-modified graphene aerogel has been studied for P recovery. This provides a new method for the P removal and recovery of low concentration P-containing wastewater.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Hui Wang,Lei Lu,Palaniappan Subramanian,Shan Ji,Palanisamy Kannan
Developing a highly active, low-cost, and durable nanostructured catalytic material is of significant interest in fuel cell applications owing to its efficient energy conversion, ease of preparation and operation, and reduced emission of pollutants. In this work, various ratio (0.01, 0.03, and 0.05 mmol) of cobalt (Co), and iron (Fe) doped nickel hydroxide (Ni(OH) 2 ) nanosheet arrays were grown on Ni foam surface (Co–Ni(OH) 2 and Fe–Ni(OH) 2 ) via a simple one-step process. The Co–Ni(OH) 2 and Fe–Ni(OH) 2 nanosheet array on Ni foam electrodes were explored as potential candidate towards electro-oxidation of urea. Notably, 0.03 mmol Co doped Ni(OH) 2 /Ni foam electrode displayed lowest-onset oxidation potential (0.21 V) and enhanced electro-oxidation of urea (59.7 mA) owing to its large amount of electrocatalytic active sites, densely assembled nanosheet array structures with porous surfaces, and electronic diffusion channels, which might promote interface electrochemical reaction . In addition, synergistic effect between Co metal with Ni(OH) 2 has also promotes enhanced electro-oxidation of urea in contrast to Fe–Ni(OH) 2 nanosheet array, Ni(OH) 2 , and Ni foam electrodes. Chronoamperometric i-t curve of Co–Ni(OH) 2 /Ni foam electrode obviously exhibited higher catalytic current, highly stable and durable properties in contrast to Fe–Ni(OH) 2 nanosheet arrays. As-fabricated Co–Ni(OH) 2 /Ni foam can be explored as a new type of potential low-cost catalyst for electro-oxidation of urea, which reveals promising use in future fuel cell energy applications .
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CRYSTENGCOMM
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2021
·Vol. 23
·期 37
·6518-6525
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IF 3.545
Qi-Ming Qiu,Guo-Yu Yang
Three new mixed-alkaline-metal borates, namely KNa8[Li@B12O18(OH)6](CO3)2 (1), Cs10[Li@B12O20(OH)2]2·6H2O (2) and Cs5[Li@B12O20(OH)2]·3H2O (3), have been synthesized under hydro/solvothermal conditions. Compound 1 is a borate carbonate with the isolated [Li@B12O18(OH)6]5− clusters and interesting layers formed by Na+ and CO32− ions, forming a 2D supramolecular structure with a 3,6-connecting binodal system. After changing the synthetic conditions, the isolated [Li@B12O18(OH)6]5− clusters are successfully extended to the layers in 2 and 3 by condensation reactions with the elimination of water molecules between oxoboron clusters. Each new fundamental building block [Li@B12O22(OH)2]9− in 2 and 3 connects with four neighboring units to form a 2D layer via B–O–B bonds for the first time, and 14-membered rings are also observed. Such a layer structure is first observed in dodecaborates. Since compound 3 crystallizes in the non-centrosymmetric space group, the second harmonic generation measurement and the dipole moments calculation have been carried out.
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CHEMOSPHERE
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2021
·
IF 7.086
Xin-Yu Wang,Yang Hao,Hong-Bo Zhao,Yuan-Ru Guo,Qing-Jiang Pan
The interfacial chemistry of nanocomposite materials is of overarching importance in the separation and purification science; moreover, its understanding helps to guide synthesis, clarify structure-property relationship and unearth novel applications. However, the composites feature rather complicated local structures and hydrogen bonds are often involved in the interface and the vicinity of active sites. In this regard, density functional theory first-principle calculations associated with experimental study have synergistically examined two-dimensional (2D) magnesium hydroxide material with different layers and their adsorption toward cellobiose. Hydrogen bonds are found responsible for the interfacial coupling, which make it vital to cover the dispersion correction in the calculation. The average adsorption energy ranges from −0.29 to −0.35 eV, falling well within the range of reported hydrogen-bonding strength. On the basis of calculated structural/interfacial properties and experimental findings, the 2D Mg(OH) 2 in terms of three-layer model was unraveled to substitute toxic Cd 2+ ion and sorb radioactive UO 2 2+ that is coordinated by water and hydroxyl groups. These reactions are thermodynamically feasible. The ion-exchanging mechanism was proposed for cadmium removal and the outer-sphere adsorption one for uranium extraction.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Hui Chen,YaFei Hou,ZhiJie Wu,Peng Du,LaiHui Luo,WeiPing Li
The progress of dielectric capacitors with superior energy storage density ( U e ) has drawn widely attentions in recent years. However, most studies improve the U e at the cost of their energy storage efficiency ( η ), which greatly limits their practical applications. In this study, a nanocomposite film based on the nickel hydroxide (Ni(OH) 2 ) and the polymethylmethacrylate and polyvinylidene fluoride blend polymer (PMMA/PVDF) is designed and prepared ( x vol%-Ni(OH) 2 -PMMA/PVDF). It has been found that introducing Ni(OH) 2 and PMMA into ferroelectric PVDF is not only able to improve the dielectric constant and breakdown field, but also able to suppress the dielectric loss and leakage current density of nanocomposite films, leading to enhanced U e and η simultaneously. Furthermore, the finite element simulation was adopted to demonstrate the mechanism of compatible improvement on the dielectric constant and breakdown field in the nanocomposite films, respectively. An excellent U e of 14.5 J/cm 3 and η of 71.7% are realized in the 3 vol%-Ni(OH) 2 -PMMA/PVDF nanocomposite film at 445 MV/m. The significantly improved U e in this composite is 181% higher than that of the pristine PMMA film and 250% higher than that of the pure PVDF film. Thus, this study might provide a new path to design the nanocomposite films with high U e and η simultaneously.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Hongmei Zhao,Tingting Zhang,Dongyu Shan,Ying Zhu,Ge Gao,Ye Liu,Jing Liu,Meiying Liu,Wansheng You
An intervening barrier for photocatalytic water decomposition and pollutant degradation is the frustratingly quick recombination of e − - h + pairs. Delicate design of heterojunction photocatalysts by coupling the semiconductors at nanoscale with well-matched geometrical and electronic alignments is an effective strategy to ameliorate the charge separation. Here a facile and environment-friendly l -cysteine-assisted hydrothermal process under weakly alkaline conditions is demonstrated for the first time to fabricate ZnIn 2 S 4 /In(OH) 3 hollow microspheres with intimate contact, which are verified by XRD, SEM, (HR)TEM, XPS , N 2 adsorption-desorption, UV–Vis DRS and photoluminescence spectra. ZnIn 2 S 4 /In(OH) 3 heterostructure (L-cys/Zn 2+ = 4, molar ratio) with a band-gap of 2.50 eV, demonstrates the best photocatalytic performance for water reduction and MB degradation under visible light, outperforming its counterparts (In(OH) 3 and ZnIn 2 S 4 ). The excellent activity of ZnIn 2 S 4 /In(OH) 3 heterostructure arises from the intercrossed band-edge positions as well as the unique hollow structure with large surface area and wide pore-size distribution, which are beneficial for the efficient charge migration from bulk to surface as well as at the interface between ZnIn 2 S 4 and In(OH) 3 . This work provides an efficient and eco-friendly strategy for one-pot synthesis of heterostructured composites with intimate contact for photocatalytic application.
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CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Qian-Ming Huang,Chun-Li Hu,Bing-Ping Yang,Ru-Ling Tang,Jin Chen,Zhi Fang,Bingxuan Li,Jiang-Gao Mao
The first polar alkaline-earth metal molybdenum iodate, Ba2[MoO3(OH)(IO3)2]IO3, with a Λ-shaped [MoO3(OH)(IO3)2]3– functional motif, was rationally designed. A zero-dimensional (0D) [MoO3(OH)(IO3)2]3– unit is derived from 0D [MoO2(OH)(IO3)3]2– polyanion through anionic mono-site substitution. Ba2[MoO3(OH)(IO3)2]IO3 possesses a strong phase-matchable second-harmonic-generation (SHG) response of approximately 8 times that of benchmark KH2PO4 (KDP), a broad transparent spectral region from near-ultraviolet to mid-infrared (0.29–10.6 μm), a large band gap of 3.78 eV, and a high laser-induced damage threshold (LDT) of 92.3 MW cm–2. The results suggest that Ba2[MoO3(OH)(IO3)2]IO3 can be potentially applied in the mid-infrared nonlinear optical field. Theoretical calculations demonstrate that the large SHG response of the title compound originates mainly from the Λ-shaped [MoO3(OH)(IO3)2]3– functional unit. From multisite substitution to mono-site substitution, this work provides a more generic route to synthesize SHG materials.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Ning Song,Shihuan Hong,Mengya Xiao,Yan Zuo,Enhui Jiang,Chunmei Li,Hongjun Dong
The application of NiCo-LDHs in the hydrogen evolution reaction (HER) is rarely reported because it is usually served as an effective electrocatalyst for oxygen evolution reaction (OER) owing to the essential chemical and electric structure features. It still is a challenge to realize the effective HER over NiCo-LDHs unless modified with noble metals . In this work, the noble-metal-free core–shell Co(OH) 2 @P-NiCo-LDH hybrid with dodecahedral hierarchical structure is prepared by the sacrificial template method along with subsequent phosphating process, which is available for the electrocatalytic HER. The fabricated Co(Ni) δ+ -P δ- bonding states on the surface of outer shell NiCo-LDH not only provide the abundant active centers but also reduce interfacial charge transfer resistance to enhance the HER activity. Meanwhile, the unique core–shell dodecahedral structure effectively avoids the agglomeration and restacking of NiCo-LDH nanosheets to improve the electrochemical stability. This work exploits a novel noble-metal-free modification strategy to expand the application of NiCo-LDH in HER.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Junyu Fan,Meimei Zuo,Zhaoxia Ding,Zhiwei Zhao,Jie Liu,Bo Sun
A promising and practicable catalyst is the key challenge for industrial perspective to promote photocatalytic nitrogen fixation. In this study, a new 0D /2D heterojunction, oxygen vacancy-induced In(OH) 3 /carbon nitride (OV-In(OH) 3 /CN), was synthesized by generating In(OH) 3 nanoparticles on g-C 3 N 4 nanosheets in the presence of glyoxal through a facile and readily precipitation growth method at 60℃and under atmospheric pressure. The existence of oxygen vacancies, structure, morphology and optical-electronic properties of the composite were characterized by HRTEM, XPS and EPR analysis and other measurements. The OV-In(OH) 3 /CN heterojunction exhibited excellent photocatalytic activity for nitrogen fixation with a good chemical stability. The OV-In/CN-3 sample reached the maximum NH 3 generation rate to be 3.81 mM*h −1 *g −1 , which was about 10 times as that of pure g-C 3 N 4 and was also higher than that of other catalysts reported. Though the In(OH) 3 in heterojunction was demonstrated incapable of producing photogenerated electrons under vis-light irradiation, its oxygen vacancy was found to “receive” and “trap” some excited electrons from g-C 3 N 4 , promoting electron-hole pairs separation efficiency and prolonging the lifetime of carriers. And it also can introduce many chemisorption sites for N 2 . Those are the two key reasons for its high photocatalytic activity.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Ruiyang Zhang,Tao Ran,Yuehan Cao,Liqun Ye,Fan Dong,Qian Zhang,Lizhi Yuan,Ying Zhou
Photocatalytic NO x removal is regarded as a promising technique for air purification in recent years. However, NO x removal process usually accompanies with toxic NO 2 generation, leading to serious secondary pollutant and limiting its practical application. Herein, a noble-metal-free g-C 3 N 4 /α-Ni(OH) 2 photocatalyst was fabricated through hydrothermal method. The introduction of α-Ni(OH) 2 microspheres combines with g-C 3 N 4 , resulting in an enlarged surface area from 35 to 95 m 2 /g, while the unique structure of α-Ni(OH) 2 broadens visible-light response range and accelerates photogenerated charge carriers transfer. More importantly, the H atoms of α-Ni(OH) 2 improve the adsorption and activation of O 2 and oxygen atoms to promote NO and NO 2 oxidized to nitrate. Consequently, g-C 3 N 4 /α-Ni(OH) 2 shows enhanced NO removal ratio of 51.3% without any toxic NO 2 generation, indicating its great potential for air purification. Our results provide fresh insight into the design of highly efficient and safe photocatalyst for toxic byproduct control in the application of environmental remediation.
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ACS Omega
·
2019
·
IF 2.584
Bo Cao,Chunhua Luo,Jie Lao,Hanqing Chen,Ruijuan Qi,Hechun Lin,Hui Peng
Layered cobalt hydroxides are cost-efficient electrocatalysts for oxygen evolution reaction (OER) in the field of energy conversion. Herein, we developed a facile synthesis method of 3d transition-metal-doped α-Co(OH)2 nanomaterials mediated with ammonia in water–methanol at room temperature. The doping of Cu2+ and Ni2+ leads to flower-like nanostructures similar to pure α-Co(OH)2, whereas the doping of Fe2+ produces nanoparticles with more than 2 times larger surface area in comparison with the Cu2+- and Ni2+-doped nanoflowers. The obtained dispersion with the addition of Nafion can be used directly as an electrocatalyst for OER with excellent catalytic activity, especially that the overpotential of Fe2+ doped is as low as 290 mV at 10 mA cm–2 and the turnover frequency is improved by 3 times as compared with that of α-Co(OH)2. Furthermore, the catalyst can be loaded onto foam nickel, which presents excellent durability with the current density unchanged under continuous chronoamperometry reaction for as long as 12 h and almost quantitative faradaic efficiency. The superior electrocatalytic properties combined with the simple synthesis without the tedious purification procedure is very promising for OER.
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