JOURNAL OF APPLIED POLYMER SCIENCE
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2022
·Vol. 139
·期 37
·e52878
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IF 3.057
Jianhua Wu,Meng Li,Ying Cao,Jianmin He,Mingjin Xue,Aoqi Zhu,Yongyi Huang,Yiting Xu,Birong Zeng,Lizong Dai
Polyurethane is a promising topcoat in anticorrosive coating system. As a topcoat, the study on improving its weathering resistance is significative. In this work, we present an anticorrosive filler, named GOFA based on p-fluoroaniline chemical modified graphene oxide, and explored the potential of GOFA to improve the weatherability and corrosion resistance of polyurethane coatings. The results of the comprehensive experimental studies showed that the addition of 0.5 wt.% GOFA leaded to an improvement in the hydrophobicity of the polyurethane coating and the composite coating exhibits an excellent shielding effect against corrosive media. At the same time, the ultraviolet aging resistance the GOFA modified polyurethane composite coating also showed satisfactory results. It is inspired that adding a small amount of GOFA can make the composite polyurethane coating have excellent anti-corrosion performance and weather resistance.
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MICROCHEMICAL JOURNAL
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2022
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IF 5.304
Xue Wang,Mengjia Li,Shuang Yang,Xuting Bai,Jiajia Shan
p -Nitrophenol ( p -NP) is an important phenolic environmental pollutant. The development of novel rapid determination methods for p -NP is of significance for environmental monitoring. In this work, a sensitive electrochemical sensor based on Ti 3 C 2 T X MXene/graphene composite was developed to detect p -NP in aqueous samples. Firstly, delaminated titanium carbide (D-Ti 3 C 2 T X ) was successfully prepared via an optimized minimally intensive layer delamination (MILD) method, which was further followed by the self-assembly method to form D-Ti 3 C 2 T X /graphene (D-Ti 3 C 2 T X /GR) composite. The prepared materials were characterized by scanning electron microscopic (SEM), X-ray diffraction (XRD), atomic force microscopy (AFM) and Raman spectroscopy. Then the glassy carbon electrode (GCE) was modified by D-Ti 3 C 2 T X /GR composite to prepare the D-Ti 3 C 2 T X /GR/GCE sensor. The electrochemical behavior of D-Ti 3 C 2 T X /GR/GCE was investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and chronocoulometry. Furthermore, the proposed sensor showed a strong electrochemical response based on the p -NP reduction reaction, benefiting from abundant active sites, fast electron transfer, and excellent electro-catalytic performance of the D-Ti 3 C 2 T X /GR composite. Under the optimal conditions, the D-Ti 3 C 2 T X /GR based electrochemical sensor displayed a linear response in the p -NP concentration range from 1 to 175 μmol·L −1 with a detection limit of 0.16 μmol·L −1 . The anti-interference performance, reproducibility, stability, and recovery in real sample analysis were also further evaluated. This study provided a novel and sensitive method for the rapid determination of p -NP in environmental samples.
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ACS Applied Energy Materials
·
2022
·
IF 6.959
Guangzhou Hu,Wenying Fu,Yuxiao Lin,Yuanchao Yue,Maosen Wang,Pengbo Liu,Yinwei Li,Jianwei Li,Lu Wei,Xinsheng Zhao,Yongsheng Wei
Electrochemical water splitting to produce clean hydrogen (H2) and oxygen (O2) has emerged as an advanced technology to build a sustainable society. Low-cost electrocatalysts with excellent performance are required to improve the energy efficiency in overall water splitting. Here, a Co-W-B-P/CF catalyst with a nanoflower-like structure consisting of microspheres and nanoflakes was successfully synthesized using a one-step double-pulse electrodeposition approach. When used as a bifunctional electrocatalyst for overall water splitting, Co-W-B-P/CF presented the potentials of 1.57 and 1.86 V at current densities of 10 and 100 mA cm–2 in 1.0 M KOH solution, respectively. This was even comparable to that of the high-cost commercial catalyst Pt/C(−)//IrO2(+). Detailed electrochemical tests also showed that the kinetics, electron transfer, and intrinsic electrocatalytic activity of Co-W-B-P/CF in the HER (hydrogen evolution reaction) and the OER (oxygen evolution reaction) were dramatically improved due to the synergetic effect of co-doped B and P elements. Considering the excellent electrocatalytic performance of Co-W-B-P/CF, along with the simple synthesis method and low cost, bifunctional electrocatalyst Co-W-B-P/CF for overall water splitting is promising.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Xiang Mei,Han Gao,Yang Ding,Chao Xue,Lijie Xu,Yong Wang,Lei Zhang,Mengyuan Ma,Zimiao Zhang,Yanyan Xiao,Xu Yang,Chengqi Yin,Zhan Wang,Mengmeng Yang,Dongyu Xia,Cai Wang
Membrane biofilm (MBf) technology is a promising biological water treatment process that combines membrane aeration with biofilms. To expand its application in the treatment of toxic organic wastewater, methane/air gas mixture-MBfs ((CH 4 + Air)-MBfs) and air-MBfs were coupled to enhance the treatment of p -nitroaniline (PNA) wastewater. Based on exploration of the membrane permeability of methane and oxygen, a hybrid MBf reactor was constructed, and the degradation characteristics of PNA and the coupling effects of (CH 4 + Air)-MBfs and air-MBfs were studied. The permeation flux of methane was found to be 1.114 g/(m 2 d) when using a methane/air gas mixture at an aeration pressure of 10 kPa, and this result was better than that when methane was used as the aeration gas alone. Aeration with a methane/air gas mixture provided conditions for realizing aerobic methane oxidation ; the aerobic methane oxidation that occurred in the (CH 4 + Air)-MBfs promoted the reduction of PNA, and the intermediates of PNA degradation were further degraded by the air-MBfs. At an influent PNA membrane area load of 1.67 g/(m 2 d), the PNA removal load reached 187.30 g/(m 3 d). The coupling of MBfs took advantage of different matrix-based MBfs and promoted the degradation of PNA by utilizing the synergistic effects of various functional microorganisms .
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EUROPEAN POLYMER JOURNAL
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2022
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IF 5.546
Jun Chen,Cong Liao,Xiao-Xiao Guo,Shi-Chang Hou,Wei-Dong He
Lead ion is a common heavy metal pollutant and extremely harmful to human health. Therefore, the research about the adsorption and removal of lead ion from sewage and the development of lead ion sorbents keeps greatly significant. In this study, poly(acrylic acid- co -acrylonitrile) (PAAN) cryogels were prepared by cryo-polymerization. After the treatment with hydroxylamine, the amidoximated PAAO cryogels were applied to remove lead ion from lead-contaminated water. The porous structure and high water permeability of the cryogel could fully facilitate the exposure of active sites to efficiently adsorb lead ion. PAAO cryogels showed a high adsorption capacity of 450 mg/g for lead ion. After the first adsorption–desorption cycle, the adsorption capacity of PAAO cryogels regenerated with alkali solution increased to 650 mg/g and remained in the next six cycles. The pseudo-second-order kinetic model and the intraparticle diffusion model fit the adsorption kinetics of lead ion well, indicating its chemi-sorption feature of PAAO cryogel sorbent. The FTIR and XPS studies suggested that carboxyl group of acrylic acid unit as well as the amidoxime group of modified AN unit contributed the enhanced adsorption ability for lead ion.
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INORGANIC CHEMISTRY
·
2022
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IF 5.436
Jingsheng Zhou,Beibei An,Zhiyong Zhu,Li Wang,Jinglai Zhang
Doping heteroatoms in carbon materials is a promising method to prepare the robust electrocatalysts for the carbon dioxide reduction reaction (CO2RR), which is beneficial for sustainable energy storage and environmental remediation. However, the obscure recognition of active sites is the obstacle for further development of high-efficiency electrocatalysts, especially for the N,P-codoped carbon materials. Herein, a series of N,P-codoped carbon materials (CNP) is prepared with different N and P contents to explore the relationship between the N/P configuration and the CO2RR activity. As compared with the N-doped carbon materials, the additional P doping is helpful to improve the activity. The optimum N,P-codoped carbon materials (CNP-900) achieve 80.8% CO Faradaic efficiency (FECO) at a mild overpotential of 0.44 V. On the basis of the X-ray photoelectron spectroscopy results, the suitable ratio between pyridinic N and graphitic N and the least P–N content are beneficial for CO2RR. The density functional theory calculations further illustrate that two elementary steps to form *COOH and *CO in CO2RR are determined by the graphitic N and pyridinic N configurations, respectively. The existence of the P–N configuration breaks the equilibrium between graphitic N and pyridinic N to suppress the activity.
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ChemSusChem
·
2022
·Vol. 15
·期 15
·e202200752
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IF 9.14
Helei Wei,Aidong Tan,Zhipeng Xiang,Jie Zhang,Jinhua Piao,Zhenxing Liang,Kai Wan,Zhiyong Fu
Graphical Ni doping enhances CO 2 reduction : The Ni doping dramatically modulated the electronic structure of the Bi nanosheet by increasing its p-orbital electronic density states and shifting towards the Fermi level. The resultant strong orbital hybridization between Bi and the π* orbitals of CO 2 facilitates the formation of *OCHO intermediates and favors its activation, leading to high activity and selectivity toward HCOOH during CO 2 electroreduction. Electrochemical reduction of CO 2 (CO 2 RR) to value-added chemicals is an effective way to harvest renewable energy and utilize carbon dioxide. However, the electrocatalysts for CO 2 RR suffer from insufficient activity and selectivity due to the limitation of CO 2 activation. In this work, a Ni-doped Bi nanosheet (Ni@Bi-NS) electrocatalyst is synthesized for the electrochemical reduction of CO 2 to HCOOH. Physicochemical characterization methods are extensively used to investigate the composition and structure of the materials. Electrochemical results reveal that for the production of HCOOH, the obtained Ni@Bi-NS exhibits an equivalent current density of 51.12 mA cm −2 at −1.10 V, which is much higher than the pure Bi-NS (18.00 mA cm −2 at −1.10 V). A high Faradaic efficiency over 92.0 % for HCOOH is achieved in a wide potential range from −0.80 to −1.10 V, and particularly, the highest efficiency of 98.4 % is achieved at −0.90 V. Both experimental and theoretical results reveal that the superior activity and selectivity are attributed to the doping effect of Ni on the Bi nanosheet. The density functional theory calculation reveals that upon doping, the charge is transferred from Ni to the adjacent Bi atoms, which shifts the p-orbital electronic density states towards the Fermi level. The resultant strong orbital hybridization between Bi and the π* orbitals of CO 2 facilitates the formation of *OCHO intermediates and favors its activation. This work provides an effective strategy to develop active and selective electrocatalysts for CO 2 RR by modulating the electronic density state.
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JOURNAL OF POWER SOURCES
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2021
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IF 9.127
Yue Zhao,Huilian Hao,Tianliang Song,Xu Wang,Changwang Li,Wenyao Li
By combining the large power density of supercapacitors with the high energy density of ion batteries , a novel zinc-ion hybrid supercapacitor (ZHSC) is proposed and considered a promising candidate. But there are still challenges in the selection and application of reliable cathode materials . Herein, we used a mature and safe one-step hydrothermal method to synthesize N/P co-doped graphene (NPG), which exhibited a unique three-dimensional structure and a large specific surface area, showing great advantages as cathode to assemble Zn//NPG ZHSC with zinc foil. In the 1 M ZnSO 4 solution, the ZHSC shows superior electrochemical performance, which presents an excellent specific capacitance of 210.2 F g −1 under a wide working voltage of 1.8 V, and it achieves both a maximum energy density of 94.6 Wh kg −1 and a large power density of 4500 W kg −1 . More importantly, the capacitance retention rate remains 82% and a coulomb efficiency of ∼100% is achieved after 15,000 cycles. Overall, the results of this study highlight the efficient synthesis and excellent performance of NPG cathode materials, and also promote the rapid development and great application of high-performance Zn-ion hybrid capacitors.
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ENVIRONMENTAL TECHNOLOGY
·
2023
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IF 2.8
Jiaying Zhu,Yanyang Wu,Bin Wu,Kui Chen,Lijun Ji
m-Cresol and p-cresol are widely used in medicine and pesticides as important chemical intermediates. They are generally produced as a mixture in industry and are difficult to separate due to the similarities in both chemical structures and physical properties. The adsorption behaviours of m-cresol and p-cresol on zeolites (NaZSM-5 and HZSM-5) with different Si/Al ratios have been compared by static experiments. Selectivity on NaZSM-5(Si/Al = 80) could be greater than 6.0. Adsorption kinetics and isotherms were investigated in detail. The kinetic data was correlated by PFO, PSO, and ID models, the NRMSE of which were 14.03%, 9.41%, and 21.11%, respectively. In the meanwhile, according to the NRMSE of Langmuir (6.01%), Freundlich (57.80%), D-R (1.1%), and Temkin (0.56%) isotherms, adsorption on NaZSM-5(Si/Al = 80) was mainly a monolayer and chemical adsorption process. It was endothermic for m-cresol and exothermic for p-cresol. The Gibbs free energy, entropy, and enthalpy were calculated accordingly. The adsorption of cresol isomers on NaZSM-5(Si/Al = 80) were both spontaneous, and it was exothermic (ΔH = −37.11kJ/mol) for p-cresol while endothermic (ΔH = 52.30kJ/mol) for m-cresol. Additionally, ΔS were respectively −0.05 and 0.20 kJ·mol−1·K−1for p-cresol and m-cresol, which were both close to zero. The adsorption was mainly driven by enthalpy. The result of breakthrough further demonstrated m-cresol and p-cresol could be separated effectively by NaZSM-5(Si/Al = 80). Additionally, the selectivity increased from 7.53 to 14.72 after four cycles regeneration with 9.95% and 53.96% decreases in the adsorption amounts for m-cresol and p-cresol, respectively. In conclusion, NaZSM-5(Si/Al = 80) could be a feasible adsorbent for the separation of m-cresol and p-cresol.
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ACS Applied Nano Materials
·
2023
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IF 5.9
Shujing Liu,Pengshuo Fan,Ying Yao,Yinghao Chang,Dong Yang,Changchun Wang,Jia Guo
Two-dimensional (2D) covalent organic polymers (COPs) featuring large surface areas and exposed active sites are desirable in the modification of electrode materials for electrochemical reactions. However, the rigid and planar conformation of 2D COPs limits the wrap of one-dimensional electrodes. Herein, we have proposed a molecular strategy to regulate in situ encapsulation of carbon nanotubes (CNTs) with 2D polyphosphazene. The stoichiometric control over the nucleophilic substitution reaction between hexachlorocyclophosphazene and amines allows for the oriented evolution around the surface of CNTs. The formed COP sheath is an ultrathin and uniform coating without granular deposition. Upon carbonization, the well-defined core/shell CNT composite was converted into the N,P-codoped carbon, exhibiting outstanding electrocatalytic oxygen reduction performance with a diffusion-limiting current density of 5.4 mA cm–2 and an electron transfer number of 3.97. The improved electrocatalytic activity originates from a high content of active N,P-containing catalytic sites uniformly distributed on porous carbon. This study provides a viable strategy to develop functional composite materials by modulating the flexibility of 2D COPs for 1D substrates, contributing to broad applicability.
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LANGMUIR
·
2023
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IF 3.9
Yuwen Sun,Baogui Zheng,Xiaowen Wu,Lianyi Wang,Jiacheng Jiang,Hao Ding,Xin Min,Zhaohui Huang,Minghao Fang,Ruiying Luo
Graphitized carbonitride (g-C3N4) is widely used in CO2 reduction, hydrogen production, and degradation of toxic chemical dyes and antibiotics. It is a kind of photocatalytic material with excellent performance, and it has the advantages of being safe and nontoxic, having a suitable band gap (2.7 eV), and having a simple preparation and high stability, but because of its fast optical recombination speed and low visible light overutilization, the multifunctional application of g-C3N4 is seriously hindered. Compared with pure g-C3N4, MWCNTs/g-C3N4 have a red-shift in the visible range and a strong absorption in the visible region. Melamine and carboxylated multiwalled carbon nanotubes were used as raw materials to successfully prepare CMWCNT modified g-C3N4 doped with P, Cl by a high temperature calcination method. The effect of the addition amount of P, Cl on the photocatalytic performance of modified g-C3N4 was studied. The experimental results show that the multiwalled carbon nanotubes can accelerate the electron migration, and the doping of P, Cl elements can change the energy band structure of g-C3N4 and reduce the band gap. Through fluorescence analysis and photocurrent analysis, it is known that the incorporation of P, Cl reduces the recombination efficiency of photogenerated electron–hole pairs. In order to explore the application in the degradation of chemical dyes, the photocatalytic degradation efficiency of RhB under visible light was studied. The photocatalytic performance of the samples was evaluated by photodecomposition of aquatic hydrogen. The results showed that when the amount of ammonium dihydrogen phosphate was 10 wt %, the photocatalytic degradation efficiency was the highest, which was 21.13 times higher than that of g-C3N4.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
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IF 5.816
Menghui Liu,Aiqun Kong,Jinli Zhang,Yan Fu,Wei Li
A superhydrophilic Ru-based 3D electrode, denoted as Ru-PA/NF, was fabricated under the assistance of phytic acid (PA) for electrocatalytic hydrogenation of p-Nitrophenol. PA serves as a multifunctional modulator to facilitate the dispersion of active Ru species in porous nickel foam (NF), meanwhile enhance the surface wettability as well as adjust the micromorphology. In alkaline media , the Ru-PA/NF electrode shows the PNP conversion of 94.68% and the PAP selectivity of 99% after 9 h, accompanied by the faraday efficiency (FE) of 73.15%. Over the superhydrophilic Ru-PA/NF the rate constant of PNP conversion into PAP is 2.62-times higher than that over the hydrophobic Ru/NF prepared without the aid of PA, and FE of Ru-PA/NF is 1.28-times higher than Ru/NF. This can be ascribed to intriguing features of Ru-PA/NF involving higher Ru loading, more exposed sites, superior electrolyte wetting along with faster charge transfer rate.
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