ACS Applied Nano Materials
·
2022
·
IF 6.14
Yue Liu,Xukun Zhu,Ling Qin,Tong Zhang,Shuhan Wang,Yachao Jin,Li Song,Ming-Dao Zhang
The construction of special heterogeneous interface structures without precious metals is found to be efficient for the development of low-cost and high-activity hydrogen evolution reduction (HER) catalysts. Here, we report a moderate method to develop an efficient and stable HER electrode especially composed of the Co2(OH)2CO3 (COC) nanowire substrate modified by benzenehexol (HOB) molecules. This kind of interfacial structure leads to prominent electrocatalytic HER performance in an alkaline environment with a low overpotential of 130.8 mV at a current of 20 mA cm–2. Meanwhile, density functional theory (DFT) calculations reveal that the nanoscale synergistic interfacial mechanism and strong electron interaction between HOB and COC can reduce the activation energy for HER.
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Nano
·
2022
·Vol. 9
·期 9
·3407-3416
·
IF 9.473
Han Song,Xinwen Ou,Mengye Wang,Yan Zhang,Zhang Lin
H2 production during the transformation of Fe(OH)2 into magnetite (i.e., Schikorr reaction), has a significant impact on many environmental applications, including the long-term effectiveness of permeable reactive barriers composed of zerovalent iron and the stability of geological radioactive waste repository. However, the reactivity of the Schikorr reaction is not systematically evaluated and its chemical mechanism still remains controversial. Here, we investigate water reduction on the Fe(OH)2 surfaces with the help of an interface-reaction model between water and Fe(OH)2. The Fe(OH)2 hexagonal nanosheets prepared using a coprecipitation method possess dominantly exposed (001) and (100) facets. As unveiled by the DFT simulations, the (001) Fe(OH)2 facet only exposes OH, which is, therefore, inert to water reduction. Moreover, the active Fe-exposed (100) Fe(OH)2 facet is more thermodynamically favourable for water adsorption and dissociation than the (101) and (102) facets. However, the high energy barrier for water dissociation (2.79 eV) may restrict the rate of water reduction on the Fe(OH)2 facet. In addition, the capacity of (100), (101), and (102) Fe(OH)2 facets to adsorb OH− is stronger than that for H2O, which further inhibits water reduction. Furthermore, DOS calculations manifest that Fe d orbitals play a significant role in H2O adsorption, indicating that manipulating the electronic structure of the Fe site is a critical path to mediate water reduction in Fe(OH)2. Our study provides new insights into the understanding of the mechanism of the phase transformation of Fe(OH)2 under anaerobic conditions in environmental and earth sciences.
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Liping Tan,Weihua Zhang,Xiaoguang Zhu,Yue Ru,Wenbo Yi,Bo Pang,Tongjun Liu
Lanthanum (La)-based nanoparticles (NPs) are promising candidates for phosphate removal owing to their inherently high affinity towards phosphate. However, significant challenges remain to be addressed before their practical deployment, especially the problems associated with their aggregation. Herein, we fabricated a high-efficient sorbent for phosphate removal through in-situ synthesizing La(OH) 3 NPs on a natural support, bacterial cellulose (BC), which is pre-modified with polyethyleneimine. The resultant La(OH) 3 NPs-immobilized BC with different La contents (BPLa-X) exhibited a highly fibrous porous structure, in which BPLa-3 was selected for further phosphate adsorption studies. BPLa-3 demonstrated a high adsorption capacity of 125.5 mg P g −1 , and high adsorption selectivity due to the large surface area and abundant exposed active adsorption sites for phosphate. Additionally, BPLa-3 also displayed high reusability and still possessed high adsorption capacity after four consecutive cycles of adsorption-desorption. Therefore, the present adsorbent is believed to be a promising candidate for practical phosphate removal.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 34
·21681-21689
·
IF 4.036
Na Cao,Jiayi Liu,Yuecheng Wang,Yingwu Zhou,Meng Zhao,Yujie Ban,Weishen Yang
The adsorption of bio-polyols from dilute aqueous solution is important but faces challenges in the sustainable bio-refinery process. One solution to increase adsorption efficiency is to leverage host–guest interactions between the polyols and materials to grant a preference for polyols. In this study, we synthesized MIL-53 and diverse OH-bonded variants, and studied their adsorption properties towards ethanediol, 1,3-propanediol and glycerol in water. Among the four materials, OH–MIL-53 exhibited fast adsorption kinetics and high capacity, and could be completely regenerated through ethanol elution. Hydrophobic interactions between the alkyl chains of the polyols and the organic linkers of OH–MIL-53 and hydrogen bonding interactions between their OH groups were identified. The synergistic effect of the host–guest interactions is responsible for the unique adsorption performances of OH–MIL-53 towards polyols, and particularly for 1,3-propanediol.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Songmei Li,Yimin Yu,Xiaoyan Sun,Xifeng Ding,Huafang Yang,Shibing Pan,Lixi Wang,Qitu Zhang
Ni(OH) 2 has been acknowledged as a promising oxygen evolution reaction (OER) electrocatalyst owing to its good electrochemical activity and low cost. However, application of the pristine Ni(OH) 2 is limited by the poor conductivity and low exposure of the active sites. Herein, a [email protected] (OH) 2 composite is prepared through a hydrothermal reaction. Heat treatment temperature proves to have a great influence on the electrocatalytic activity. In 0.1 M KOH electrolyte, the composite treated at 175 °C shows an overpotential of only 287 mV to reach the current density of 10 mA·cm −2 . Besides, the low Tafel slope (42 mV·dec −1 ) and superior stability (15 h at 10 mA·cm −2 ) also confirm the composite as an excellent OER electrocatalyst. The brilliant activity and stability toward OER can be attributed to the promoted coupling between Ni and Fe centers and the improved conductivity due to the 2D 18 p-electrons ring conjugate structure of hemin. Besides, effective hydrogen bonds between Ni(OH) 2 and hemin hinder the aggregation of Ni(OH) 2 , which ensures the catalyst enormous accessible active sites. This work offers a new method for the modification of Ni(OH) 2 as OER electrocatalysts. And the application of hemin also serves as a successful case for the use of biomass materials in OER electrocatalysis .
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Nano
·
2021
·Vol. 8
·期 12
·3833-3845
·
IF 8.131
Tingting Li,Yangsai Lyu,Jia Li,Chengyan Wang,Ningning Xing,Jie Yang,Min Zuo
Micromotors have held great promise for environmental treatment due to their unique self-propelled movement that can significantly accelerate the chemical process in solution. Herein, we have developed a new AO–Mn2O3/γ-AlO(OH) fluorescent micromotor using renewable and uniquely hollow kapok fibers as biological templates. The AO–Mn2O3/γ-AlO(OH) micromotor was powered by the asymmetric decomposition of hydrogen peroxide fuel catalyzed by Mn2O3, reaching a maximum speed of 139.6 μm s−1 in 3% H2O2 solution. The micromotor revealed a markedly enhanced fluorescence effect compared to both pure AO solution and non-micromotor counterparts and exhibited excellent selectivity and sensitivity for Hg2+ detection. The detection range and limit for Hg2+ were 5 × 10−8–5 × 10−5 M and 2.25 × 10−8 M, respectively. The enhanced Hg2+ sensing benefited from the synergy of enhanced fluorescence via the inhibition of the dimerization of AO, fluorescence quenching induced by charge transfer and the enhanced contact between the micromotor and Hg2+ ions resulted from the self-propelled motion. This micromotor-assisted fluorescence detection idea provided a new strategy for the development of sensors with high sensitivity.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
A.Y. Chen,H.H. Liu,P. Qi,X.F. Xie,M.T. Wang,X.Y. Wang
3D flower-like MoS 2 /NiCo(OH) 2 CO 3 (MoS 2 /NiCoHC) composites are synthesized by a hydrothermal method using MoS 2 nanospheres as precursors. The microstructure of the composite is characterized by X-ray diffraction, Raman spectroscopy , scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. The MoS 2 nanospheres are served as nucleating agent to trigger the formation of NiCoHC nanosheets , which self-assemble into 3D flower-like MoS 2 /NiCoHC particles. The MoS 2 /NiCoHC composites exhibit a high supercapacitive performance with a specific capacity of 583 C g −1 (1296 F g −1 ) at 1 A g −1 and a long-term cycling stability by retaining 94.3% after 2000 cycles in 2 M KOH. Moreover, the asymmetric supercapacitor of MoS 2 /NiCoHC as the positive electrode and commercial active carbon as the negative electrode achieves a high power density of 375 W kg −1 at 16.4 Wh kg −1 . The enhanced performance of the MoS 2 /NiCoHC composite can be attributed to the larger surface area provided by 3D flower-like structure and the synergy of the two hybrids.
✓ 已验证
产品关联
DOI
高影响因子
ATMOSPHERIC ENVIRONMENT
·
2020
·
IF 4.039
Fenghua Li,Shanshan Tang,Narcisse T. Tsona,Lin Du
Kinetics and mechanism of α-terpineol oxidation by OH radicals were studied in the aqueous phase under acidic condition, and the optical properties of the reaction products were examined. Using the relative rate method, the rate constant of α-terpineol reaction with OH radicals was determined to be (1.3 ± 0.3) × 10 10 M −1 s −1 . The reaction products were analyzed by gas chromatography-mass spectrometry (GC-MS) and the reaction mechanism was proposed. The absorbance changes of the products were monitored by a UV–vis spectrophotometer, and α,β-unsaturated ketone compounds were observed. A certain distribution of α-terpineol in the aqueous phase has the potential to be conducive to the formation of aqueous secondary organic aerosols. At the same time, in order to investigate the persistence of α-terpineol in the atmosphere, its lifetime towards reaction with OH in atmospheric water was determined to be 6.2 h and 1.0 h in urban and remote area, respectively.
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Yangfan Lin,Jingwei Jiang,Yaguang Zhang,Xueqin He,Jianguo Ren,Peng He,Chunlei Pang,Chengmao Xiao,Deren Yang,Ning Du
The promoting effect of hydroxyls on a silicon surface on the decomposition of an electrolyte is studied by comparing the performance of silicon–hydroxyl (Si–OH) and silicon–alkyl (Si–C3H7) electrodes. X-ray photoelectron spectroscopy (XPS) characterization of solid electrolyte interphase (SEI) layers on both electrodes demonstrates the influencing mechanism that hydroxyls can react with LiPF6 to form POF3, which further induces the decomposition of the electrolyte solution. This study provides a new consideration that limiting the amount of hydroxyls on the silicon surface in an appropriate range is significant to the electrochemical performance of silicon-based anode materials.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Ni Han,Qixiang Xu,Gashaw Beyene,Qinfang Zhang
Photocatalytic degradation has been regarded as a promising method for environmental remediation. In this work, layered g-C 3 N 4 /(BiO) 2 (OH) x Cl 2− x (NBHC) heterojunction composites were synthesized by a hydrothermal method. The two-dimensional (2D)/2D porous layered Z-scheme heterojunction leaded to the suppressed recombination and the efficient separation of photogenerated electron-hole pairs. Meanwhile, NBHC composites exhibited a high specific surface area and rich mesopores for more reactive active sites. Thus, NBHC had an excellent photocatalytic degradation performance of pollutant trypan blue (TB). Furthermore, we found that the active species of superoxide radical ( O 2 − ) played a more important role, while hydroxyl radical ( OH) contributed to a lesser extent in photocatalytic degradation of TB based on the active species capture experiment and electron spin resonance (ESR) spectra. A Z-scheme photocatalytic mechanism was proposed to understand the photodegradation of TB. This study may provide a new horizon for constructing novel Z-scheme heterostructure photocatalysts with an excellent performance.
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Pengfei Zou,Wen-Hui Lee,Zhiqin Gao,Di Qin,Yuxia Wang,Jiao Liu,Tongyi Sun,Yuanyuan Gao
Novel nanomaterials have been developed for antimicrobial and wound healing applications. Here, we report the preparation of a polyvinyl alcohol/chitosan (PVA/CS) nanofiber with carboxymethyl chitosan nanoparticles (CMCS-OH30 NPs) encapsulating the antibacterial peptide OH-CATH30 (OH-30). The PVA/CS nanofibers containing OH-30 NPs (NP-30-NFs) obtained via electrospinning could achieve a secondary embedded OH-30. The effect of NP-30-NFs on the release of OH-30 was investigated through high-performance liquid chromatography. The antibacterial activities of NP-30-NFs against Escherichia coli and Staphylococcus aureus were studied by bacterial plate counting. NP-30-NFs containing different concentrations of NPs were applied to mouse skin wounds to determine their effectiveness in promoting wound healing. Results showed that NP-30-NFs exhibited antibacterial properties and promoted skin wound healing.
✓ 已验证
DOI
PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 21
·3844
·
IF 5.719
Zhenlan Xu,Qing Tang,Aimei Hong,Lingxiangyu Li
Along with the development of nanotechnology, nanomaterials have been gradually applied to agriculture in recent years, such as Cu(OH)2-nanorods-based nanopesticide, an antibacterial agrochemical with a high efficacy. Nevertheless, knowledge about physical stability of Cu(OH)2nanopesticide in soil solutions is currently scarce, restricting comprehensive understanding of the fate and risk of Cu(OH)2nanopesticide in the soil environment. Herein we investigated aggregation, sedimentation and dissolution of Cu(OH)2nanopesticide in soil solutions extracted from three different soil samples, wherein commercial Cu(OH)2nanopesticide formulation (NPF), as well as its active ingredient (AI) and laboratory-prepared Cu(OH)2nanorods (NR) with similar morphology as AI, were used as model Cu(OH)2nanopesticides. We found that NPF compared to AI showed less extents of aggregation in ultrapure water due to the presence of dispersing agent in NPF. Yet, moderated aggregation and sedimentation were observed for Cu(OH)2nanopesticide irrespective of NPF, AI or NR when soil solutions were used instead of ultrapure water. The sedimentation rate constants of AI and NPF were 0.023 min−1and 0.010 min−1in the ultrapure water, whereas the rate constants of 0.003–0.021 min−1and 0.002–0.007 min−1were observed for AI and NPF in soil solutions, respectively. Besides aggregation and sedimentation, dissolution of Cu(OH)2nanopesticide in soil solutions was highly dependent on soil type, wherein pH and organic matter played important roles in dissolution. Although the final concentrations of dissolved copper (1.08–1.37 mg/L) were comparable among different soil solutions incubating 48 mg/L of AI, NPF or NR for 96 h, a gradual increase followed by an equilibrium was only observed in the soil solution from acidic soil (pH 5.16) with the low content of organic matter (1.20 g/kg). This work would shed light on the fate of Cu(OH)2nanopesticide in the soil environment, which is necessary for risk assessment of the nanomaterials-based agrochemical.Keywords:soil solutions;aggregation;sedimentation;Cu(OH)2nanopesticide;dissolution
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）