Polymer-Plastics Technology and Materials
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2019
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IF 0
Ying Pan,Ke Ke,Lin Cheng,Hongting Zhao
In this study, flexible polyurethane foam (FPUF) was successfully coated with nano-Mg(OH)2 platelets. Due to the strong interaction between chitosan and nano-Mg(OH)2, it was possible to yield modified foam with a weight-gain of up to 15 wt% by depositing one chitosan layer and one nano-Mg(OH)2 layer. Meanwhile, the adsorption isotherms of Cu2+ on FPUF covered with 10 wt% coating (FPUF-10) shows the Langmuir behavior. It was found that for the FPUF-10, the removal % for Cu2+ after 30 min and 50 min treatment were 86% and 90%, respectively. Moreover, the maximum removal % could reach up to 95%.
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Journal of Environmental Sciences
·
2018
·
IF 3.12
Xiaole Zhao,Yingchun Su,Shubin Li,Yajun Bi,Xiaojun Han
Dyestuffs and heavy metal ions in water are seriously harmful to the ecological environment and human health. Three-dimensional (3D) flowerlike Fe(OH) 3 microspheres were synthesized through a green yet low-cost injection method, for the removal of organic dyes and heavy metal ions. The Fe(OH) 3 microspheres were characterized by thermal gravimetric analysis (TGA), Fourier transform infrared (FT-IR), and transmission electron microscopy (TEM) techniques. The adsorption kinetics of Congo Red (CR) on Fe(OH) 3 microspheres obeyed the pseudo-second-order model. Cr 6 + and Pb 2 + adsorption behaviors on Fe(OH) 3 microspheres followed the Langmuir isotherm model. The maximum adsorption capacities of the synthesized Fe(OH) 3 were 308, 52.94, and 75.64 mg/g for CR, Cr 6 + , and Pb 2 + respectively. The enhanced adsorption performance originated from its surface properties and large specific surface area of 250 m 2 /g. The microspheres also have excellent adsorption stability and recyclability . Another merit of the Fe(OH) 3 material is that it also acts as a Fenton-like catalyst. These twin functionalities (both as adsorbent and Fenton-like catalyst) give the synthesized Fe(OH) 3 microspheres great potential in the field of water treatment .
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PubMed
高影响因子
ChemCatChem
·
2018
·Vol. 10
·期 20
·4555-4561
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IF 4.674
Xiaoguang Liang,Ruoting Dong,Dapan Li,Xiuming Bu,Fangzhou Li,Lei Shu,Renjie Wei,Johnny C. Ho
Graphical A hierarchical porous electrocatalyst structure utilizing Ni(OH) 2 nanosheets directly synthesized on Ni foam as the conductive and interconnected supports is developed for the deposition of Ni−B nanoparticles by using the facile dip-coating method. This synergistic hybrid electrocatalyst system configured of Ni−B nanoparticles, Ni(OH) 2 nanosheets and Ni foam can exhibit dramatically electrocatalytic activities and superior long-term stabilities towards oxygen evolution reaction. Earth-abundant and highly-efficient electrocatalysts for oxygen evolution reaction (OER) are urgently desired to realize the large-scale storage and conversion of renewable energies. In this work, we develop a hierarchical porous electrocatalyst structure utilizing Ni(OH) 2 nanosheets directly synthesized on Ni foam as the conductive and interconnected supports. By coupling with amorphous Ni−B nanoparticles, this hybrid catalyst exhibits dramatically enhanced electrocatalytic activities and durabilities towards OER. In specific, along with the optimized Ni−B loading, this catalyst requires only an impressively small overpotential of 300 mV to drive a current density of 100 mA cm −2 for oxygen evolution in 1 M KOH electrolyte. Meanwhile, it also yields a small Tafel slope of 49 mV dec −1 and a superior long-term stability. All these results evidently indicate that the hierarchical hybridization of Ni−B with Ni(OH) 2 on Ni foam can effectively synergize the oxygen evolution, opening up a new vista for designing high-performance transition metal-based nanostructures in the field of electrochemical water splitting.
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高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2018
·Vol. 20
·期 38
·24561-24569
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IF 3.906
Ping Wang,Hengyan Yang,Ding Wang,AiYing Chen,Wei-Lin Dai,Xianglong Zhao,Junhe Yang,Xianying Wang
We report a feasible strategy via hydrothermal crystallization to activate Kagome lattice-structured Cu3V2O7(OH)2·2H2O volborthite mineral as a stable visible-light-driven photocatalyst. It was demonstrated to play a crucial role in stimulating absorption ability and photodegradation performance for the removal of methylene blue present in high concentration. In contrast, direct calcination was almost ineffective, whereas post-calcination was significantly detrimental. Moreover, the photocatalytic water oxidation activity of hydrothermally crystallizated volborthite was comparable to that of BiVO4, and it was clearly higher than those of WO3 and g-C3N4 from aqueous NaIO3 solution. By further in situ decoration with an optimum amount of CoOx cocatalysts (i.e., 2 wt%), the oxygen evolution rate of volborthite was greatly enhanced, and it was 1.6-fold, 1.8-fold and 2.9-fold higher than those of BiVO4, WO3 and g-C3N4, respectively. The importance of hydrothermal crystallization can be elucidated in terms of water-Kagome lattice structure interactions involving built-in intrinsic electric field and formation of single hydrogen bonds.
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PubMed
高影响因子
MATERIALS LETTERS
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2019
·
IF 3.019
Hongqin Ma,Meijie Wang,Jiasheng Zhang,Shuai Sun
To circumvent the liquid-solid separation and dispersion of the powdered adsorbent during adsorption-desorption circulation, using a drop-oil sol-gel method, the spherical ZrO(OH) 2 /AlOOH hybrid composite beads were prepared as an adsorbent for sulfate adsorption removal from water. The preparation mechanism was proposed and discussed in term of the characterization results showing that the as-prepared beads is an amorphous mesoporous material constructed from nanoflakes composed of rod-like nanoparticles, and possesses a good sphericity, a relatively high specific surface area (195.56 m 2 /g) and adequate mechanic strength (Zr/Al(0.2)-30-3.5, 32.1 N). The adsorption tests indicated that the saturated adsorption capacity increases with sulfate concentration and decreases with prolongation of adsorbent drying time, owing to the reduction of water content, the maximum adsorption capacity can reach 205 mg/g (Zr/Al(0.2)-30-2). This work has a profound significance for the further research and industrial application of spherical adsorbent related to hydrate zirconia in fixed adsorption bed.
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高影响因子
GREEN CHEMISTRY
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2017
·Vol. 19
·期 24
·5809-5817
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IF 9.125
Haidong Yang,Yu Long,Yan Zhu,Ziming Zhao,Ping Ma,Jun Jin,Jiantai Ma
The exploration of highly efficient nonprecious metal-based electrocatalysts for the oxygen evolution reaction (OER) is of great importance for potential applications in sustainable energy conversion. Recently, the layered metal hydroxide (LMH) family is receiving extensive research attention owing to its unique structural properties. However, the gained electrocatalytic performance of LMH-based catalysts for the OER is still far from the state-of-the-art requirements because of its finite number and poor reactivity of exposed active sites. In response, we synthesized crystal lattice distorted ultrathin cobalt hydroxide (denoted as CLD-u-Co(OH)2) nanosheets with a great number of efficient catalytic active sites through the introduction of Ga into ultrathin Co(OH)2, followed by a selective removal of Ga, denoted as the “introduction @ removal” process. As a result, the crystal lattice distortion confined inside CLD-u-Co(OH)2 generates abundant elongated Co–OOH bonds on exposed (10) facets serving as efficient catalytic active sites for the OER. Besides, the optimized amount of “introduction @ removal” of Ga (4 at%) allows for an exquisite balance between distortion engineering and electrical conductivity, synergistically. The as-prepared CLD-u-Co(OH)2 achieves an overpotential of 265 mV at a current density of 10 mA cm−−2, an unexpectedly small Tafel slope of 47 mV dec−−1, and a long-term stability (beyond 20 h) in basic media. It is mainly attributed to abundant catalytic active sites, robust reactivity per site, and good electrical conductivity. Furthermore, the green and sustainable engineering of crystal lattice distortion to improve the intrinsic electrocatalytic activity of CLD-u-Co(OH)2 nanosheets presented in this work may provide a promising strategy to design and synthesize newly highly efficient LMH-based electrocatalysts for the OER.
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高影响因子
IRANIAN POLYMER JOURNAL
·
2025
·
IF 2.8
Duan Qiancheng,Dong Xiang,Sun Zhiyu,Dai Guowei,Li De-long,Xie Le,Liu Song
A novel multifunctional flame-retardant DOPO-AS/M(OH)(OCH 3 ) (M = Co, Ni) was synthesized and incorporated into epoxy resin (EP) to prepare EP composites with enhanced flame retardancy and mechanical properties. Specifically, the DOPO-AS was synthesized using 3-aminopropyltriethoxysilane (APTES), salicylaldehyde (Salal), and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). The 2D nanosheet M(OH)(OCH 3 ) was surface modified with DOPO-AS, thereby synthesizing the organic/inorganic nanohybrid DOPO-AS/M. The results showed that the addition of only 5% (by wt) DOPO-AS/M enabled EP to achieve the UL-94 of V-1 rating, with the limiting oxygen index (LOI) increasing from 28.7% to 31.0%. The thermogravimetric analysis (TGA) results demonstrated that the EP/DOPO-AS/M composite exhibited a significant enhancement in thermal stability compared to pure EP. Meanwhile, EP/DOPO-AS/M 5% composite showed significant reduction of 48.1%, 14.7%, 30.9%, and 22.7% in the peak heat release rate (pHRR), total heat release (THR), smoke production rate (SPR), and total smoke production (TSP), respectively. In addition, the tensile strength and elongation-at-break of the EP composite with 1% (by wt) DOPO-AS/M were increased by 13.5% and 3.2%, compared with pure EP. This work provides a novel and facile strategy for the simultaneous enhancement of flame retardancy and mechanical properties in EP composites, showing promising potential for practical applications. Graphical
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Zhixiang Zhai,Miaojing Pan,Jia Wu,Wenjie Jiang,Huan Wen,Shibin Yin
Urea is a common component present in both biological waste and water pollutants. Using it as an electrolyte substrate to replace the oxygen evolution reaction (OER) on the anode to assist hydrogen production is thermodynamically favorable and economically attractive. However, at high current densities (e.g., greater than 500 mA cm −2 ), the competitive adsorption of urea and OH − significantly limits the activity of the urea oxidation reaction (UOR). To overcome this challenge, this work designed and developed a catalyst consisting of a V-doped NiCo alloy, which is enclosed in an N-doped carbon layer. According to spectral characterization and density functional theory (DFT), the synergistic interaction between the N-doped carbon layer and V enhances the electron enrichment from the bulk to the surface. Meanwhile, the highly electronegative nitrogen atoms simultaneously regulate the local charge distribution of the carbon layer. This guarantees the optimal binding strength between reactants (urea and OH − ) and active sites. Consequently, V-NiCo@NC exhibits excellent urea oxidation performance ( E 10/1000 = 1.27/1.43 V RHE ). Additionally, the introduction of the N-doped carbon layer significantly improves the long-term durability of the catalyst, it can run steadily for 100 h at 1000 mA cm −2 . This work provides an approach for designing efficient UOR catalyst materials and offers insights for optimizing catalytic performance by balancing competing adsorption.
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高影响因子
JOURNAL OF POWER SOURCES
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2024
·
IF 8.1
Wei Wang,Mengrui Li,Liang Liu,Xiaoshuang Zhou,Xiankai Li,Kewei Zhang,Lina Chen,Jun Wei,Long Chen
To meet the practical demands of flexible fiber-shaped supercapacitors (FSSCs) for wearable electronics, it's crucial to develop electrodes with both high energy density and flexibility. In this work, an ultrahigh capacitance (Co,Mn)(Co,Mn) 2 O 4 /Ni(OH) 2 (CMO/Ni(OH) 2 ) fiber electrode is designed. The (Co,Mn)(Co,Mn) 2 O 4 (CMO) nanosheets possessing large specific surface area and enriched active sites, which can be served as nano-substrate for the electrodeposition of Ni(OH) 2 . This special structure facilitates the exposure of more electroactive sites and accelerate rapid electrons transfer, resulting in boosted electrochemical performance. Benefiting from these advantages, the area capacitance of the CMO/Ni(OH) 2 electrode is up to 4787.6 mF cm −2 at 1 mA cm −2 , which is approximately 15 times higher than that of the CMO (311 mF cm −2 ), and 6.7 times higher than that of the Ni(OH) 2 (718 mF cm −2 ). Coupled with activated carbon (AC) electrode, the assembled all-solid-state CMO/Ni(OH) 2 //AC FSSCs demonstrate a high energy density of 89.45 μW h cm −2 at 1505 μW cm −2 , along with great flexibility and stability. Moreover, these devices can be integrated into clothes, and electronic watch, serving as an energy supply. This work offers a novel approach to designing high-performance fiber electrode for wearable flexible energy storage devices.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2016
·
IF 2.76
Yu Zheng,Ping Zhang,Hairong Yue,Gang Xiang,Zexin Qian,Hongtai Li,Wei Jiang,Bin Liang,Simo O. Pehkonen,Shaojun Yuan
Ni 3 Si 2 O 5 (OH) 4 nanotubes (NTs) are synthesized by a facile one-pot hydrothermal reaction, and further functionalized by grafting of poly(methacrylic acid) (PMAA) brushes via distillation-precipitation polymerization. The resultant PMAA-grafted NTs are used as a novel nanosorbent to uptake copper(II) ions. Success in each functionalization step is ascertained by the characterization of TEM, FTIR, XPS, SEM and TGA. Batch adsorption results indicate that the adsorption of the pristine and PMAA-grafted silicate NTs is fairly fast and the equilibrium is established within 20 min, and the kinetics follow the pseudo-second-order mechanism, evidencing chemisorption as the rate-limiting step. The best interpretation for the equilibrium data is given by Langmuir isotherm, and the maximum adsorption capacity is 2.13 mmol g −1 (136 mg g −1 ) at pH 5 and 25 °C. The successive adsorption-desorption studies reveal that the PMAA-grafted silicate NTs are readily regenerated, and keep their adsorption and desorption efficiencies constant over five cycles. The Ni 3 Si 2 O 5 (OH) 4 - g -PMAA NTs could be directly reduced via hydrothermal reaction to achieve magnetic property for easy separation. With the inherent advantages of pH-sensitivity of PMAA, large surface area and magnetic properties of Ni 3 Si 2 O 5 (OH) 4 NTs, the PMAA-grafted silicate NTs offer a promising and highly efficient nanocomposite sorbent to remove heavy metal ions from aqueous solution.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
·
IF 8.328
Hongying Zhao,Ying Chen,Qiusheng Peng,Qingning Wang,Guohua Zhao
A novel bifunctional MOF(2Fe/Co)/CA cathode with a high surface possessing area, and good electrocatalytic and photocatalytic activity, was proposed for the solar photo–electro–Fenton (SPEF) process. The optimal nFe: nCo ratio was 2:1 for successfully introducing MOF(2Fe/Co) on the surface of CA, which is due to the specific interaction affinity of FeOOH between MOF(2Fe/Co) and CA. Continuous on–site generation of H 2 O 2 through an oxygen reduction reaction (ORR) was achieved over the CA cathode. The electron transfer number (n) of the ORR with CA was 2.5 in the selected potential range. Moreover, the addition of MOF can behave as the active sites for enhancing the ORR activity and hence can increase the yield of the H 2 O 2 . Simultaneously, the photoinduced electron (e cb − ) of MOF(2Fe/Co) efficiently in–situ decomposed H 2 O 2 to form hydroxyl radicals ( OH). The observation indicated that the e cb − is an efficient and new Fenton–like catalysts that is pH–independent. Efficient photo–electro–catalytic performance was exhibited when applied to degrade Rhodamine B (RhB) and dimethyl phthalate (DMP). Almost 100% RhB removal and 85% DMP removal were reached in 45 min and 120 min, respectively. The MOF(Fe/Co)/CA presented very low iron and cobalt leaching (<0.5 ppm) even in an acidic media, and it retained an efficient degradation efficiency in the wide pH range of 3–9.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2015
·
IF 4.642
Zanyong Zhuang,Xinwen Ou,Jingyuan Li,Yuan Zhou,Zhihong Zhang,Shengfa Dong,Zhang Lin
Abundant salts and complex constituents pose challenges to the enrichment of trace-level uranyl from field water samples. On the basis of the chemical behavior of the uranyl cation in several physical–chemical conditions (in the presence of MgCl2 etc.), we developed a facile and green strategy to improve the uranyl extraction from field water samples, different from the traditional way with organic impregnation. In our systems about nano-Mg(OH)2 treating salt lake brine, when the adsorbent is pretreated with a trace amount of UO22+ ion, the ability to extract uranyl from brine can increase by 2–5 times. The molecular dynamics simulation and time-resolved laser-induced fluorescence spectroscopy analysis show that, in the preadsorption stage, UO22+ ions can steadily bind to the Mg(OH)2 (001) surface because of the interaction with surface hydroxyl groups. When pretreated Mg(OH)2 was exposed to brine, the coordination interaction between the preloaded UO22+ ion and the [UO2(CO3)x(2x–2)–] in solution engenders good selectivity and affinity for uranyl over competitive ions in brine. Besides, the coordination number of UO22+ by carbonate oxygen is large, which further facilitates subsequent adsorption. Such strategy does not introduce other impurities and can apply to metal-oxides-type adsorbents, e.g., TiO2. This study should shed light on further improvement of efficient uranyl extraction from field samples and give insights into the mechanism understanding of uranyl adsorption in real systems.
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高影响因子
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