Catalysts
·
2017
·Vol. 7
·期 12
·362
·
IF 3.082
Chunjing Hao,Zehua Xiao,Di Xu,Chengbo Zhang,Jian Qiu,Kefu Liu
Textile dyes are some of the most refractory organic compounds in the environment due to their complex and various structure. An integrated resin adsorption/Dielectric Barrier Discharge (DBD) plasma regeneration was proposed to treat the indigo carmine solution. It is the first time to report ectopic regeneration of the saturated resins by non-thermal Dielectric Barrier Discharge. The adsorption/desorption efficiency, surface functional groups, structural properties, regeneration efficiency, and the intermediate products between gas and liquid phase before and after treatment were investigated. The results showed that DBD plasma could maintain the efficient adsorption performance of resins while degrading the indigo carmine adsorbed by resins. The degradation rate of indigo carmine reached 88% and the regeneration efficiency (RE) can be maintained above 85% after multi-successive regeneration cycles. The indigo carmine contaminants were decomposed by a variety of reactive radicals leading to fracture of exocyclic C=C bond, which could cause decoloration of dye solution. Based on above results, a possible degradation pathway for the indigo carmine by resin adsorption/DBD plasma treatment was proposed.Keywords:indigo carmine;resin;Dielectric Barrier Discharge;adsorption;regeneration
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Materiomics
·
2020
·
IF 5.797
Gajula Prasad,Jun-Wei Liang,Wei Zhao,Yingbang Yao,Tao Tao,Bo Liang,Sheng-Guo Lu
The effect of a N,N-dimethylformamide (DMF)/acetone solvent system (3:7, 4:6, 5:5, 6:4, 7:3) and spinning medium (air and water) on the membrane morphology and the structure-property relationship were investigated. A facile method was optimized to generate a porous, polymer-fiber membrane via the combinative effect of electrospinning and thermally inducing phase separation of the DMF/acetone (4:6) solvent system in a water medium. The attenuated total reflection (ATR) - Fourier transform infrared (FTIR) results showed an increased β-phase compared to the pristine poly(vinylidene fluoride) (PVDF). The XRD and DSC results further confirmed that the co-existing α- and β-phases in the pristine PVDF were converted into a unique β-phase in the electrospun membranes. In addition, the solvent uptake percentage of the DMF/acetone (4:6) solvent system in a water medium (540) is much greater than that in an air medium (320), and over two times better than that of commercial polyethylene (PE) membranes (190). Similarly, the discharge capacity of the PVDF membrane separator prepared with the DMF/acetone (4:6) solvent system in a water medium is higher than that of the air medium. This enhancement of solvent uptake might be due to the interconnected porous morphology present in the water medium.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Dapeng Li,Jinqiang Wu,Jiangtao Duan,Xiaoxu Liu,Jingjing Gong,Suxiang Ge
Exploring the practical method to grow high quality metal phthalocyanine (MPc) crystals and understanding their growth mechanism is significant for their applications. In this study, manganese phthalocyanine (MnPc) crystals were successfully synthesized using simple substance Mn and dicyanobenzene in the reaction medium of ethanediol without any other chemical reagents. The well shaped quadrangular MnPc crystals more than 500 μm were in situ grown on Mn slice surfaces via a simple solvothermal reaction. XPS analyses show that Mn has the mixed chemical state of +3 and + 4 in MnPc. Ethanediol acted as not only the solvent but also acidic catalyst to boost the ionization of dicyanobenzene. Different from the reported synthesis of MPc crystals, MnPc crystals could be formed at a wide temperature range of 100–190 °C. The reaction time is the only experimental parameter to regulate the crystal growth. To the best of our knowledge, this is the first report on in situ synthesis of the high quality MnPc crystals on Mn substrate by using a simple solvothermal method.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Caihong Qin,Peng Zhang,Rongrong Liu,Xiaoge Zhang
Chlorinated volatile organic compounds (CVOCs) are hazardous to the environment and human health. Although the catalysis technology can effectively degrade CVOCs, there are problems of catalyst poisoning and harmful byproducts. In this study, the dielectric barrier discharge (DBD) coupled wet ultraviolet (UV) system (DBD + UV/H 2 O) without catalysts was proposed for the removal of a typical CVOC chlorobenzene (CB). The CB removal rate of the DBD + UV/H 2 O system was as high as 91.8 %, and the CB mineralization rate reached 76.1 %. Furthermore, the CB removal performance of the DBD + UV/H 2 O system was stable and the CB removal rate was approximately 91 % even after 15 h of reaction. In the UV/H 2 O reactor, O 3 generated by DBD was converted to ∙OH and ∙O 2 - , which played a key role in deep CB oxidation. Based on organic intermediates and density functional theory calculations (DFT), CB was degraded mainly through the hydrodechlorination pathway in the DBD reactor, while undegraded CB and organic intermediates were deeply oxidized by UV, ∙OH, and ∙O 2 - in the UV/H 2 O reactor. This study demonstrated that DBD + UV/H 2 O system can efficiently, and deeply remove CVOCs under catalyst-free conditions.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Kai Sun,Zi-Hao Wu,Jie Liu,Zhou-Hua Cheng,Dong-Feng Liu,Hui Lin,Han-Qing Yu
Fungal laccase producers can effectively address bisphenol A (BPA) and antibiotic-contaminated water. However, the role of small mediators produced by fungal secondary metabolism in enhancing the removal of refractory contaminants is often overlooked. In this work, an efficient laccase-producing strain, Trametes hirsuta La-7, was activated to simultaneously treat BPA and antibiotics. Coexisting tetracycline, ciprofloxacin, sulfadiazine, or roxithromycin inhibited fungal cell growth, reducing laccase biosynthesis but largely increasing the formation of syringaldehyde (SYR), 4-hydroxybenzoic acid (HBA), and vanillin (VAN) through a complex regulatory network. These specialized metabolites ( i.e. , small mediators) acted as diffusible electron carriers for laccase, enabling the oxidative decomposition of the four antibiotics with high redox potentials. According to laccase-mediator-regulated radical random polymerization and decomposition, the identified intermediates of copollutants were parallelly concentrated in oligomeric coupling products and oxidative cleavage species. By inoculating logarithmic phase cell pellets in conjunction with an artificially added small mediator (SYR, HBA, or VAN), the removal efficiencies of BPA and the four antibiotics within 5 d reached 100% and 69–100% in artificial wastewater, respectively. The low and ultimately non-biotoxic intermediate products generated in the fungus-mediator systems mitigated the eco-environmental risks of the parent compounds. This work highlights the previously underappreciated role of secondary metabolism-derived small mediators in enhancing the degradation of BPA and antibiotics by a laccase-expressing fungus and is beneficial to the rational design of a robust fungus-mediator system for environmental bioremediation.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Weishuang Fang,Kai Cheng,Huicheng Xiang,Ying Tang,Yifan Zhai,Congxue Su,Liang Fang
It has become a focus to develop low-permittivity microwave dielectric materials to meet the needs of high-speed transmission in telecommunication devices. Here, we report two Ge-based microwave dielectric ceramics prepared using the conventional solid-state method, MgGeO 3 and ZnGeO 3 , with low permittivity of 6.8 and 6.6, the high-quality factor of 65,200 GHz and 25,200 GHz, and negative temperature coefficient of −45 ppm/°C and −35 ppm/°C. Orthorhombic ilmenite structure of MgGeO 3 can be obtained in the range of 1160–1240 °C. However, the single-phase ZnGeO 3 is not available in air, and the ceramics sintered at 1040–1120 °C contain two phases of Zn 2 GeO 4 and GeO 2 .
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Yang Cao,Xiong Tong,Xian Xie,Qiang Song,Wenjie Zhang,Yunpeng Du,Shengdong Zhang
Grinding plays an important role in the beneficiation process. Different grinding media can determine the size distribution, shape, and even the surface properties of the produced material. However, comprehensive research related to the effect of grinding media on the flotation performance of cassiterite is lacking. In the current study, the effects on the flotability of the products obtained by grinding with ceramic and stainless steel media were investigated using micro-flotation, laser particle size distribution analysis, inductively coupled plasma optical emission spectroscopy (ICP-OES), chemical element analysis, zeta potential measurements, field emission scanning electron microscopy-energy dispersive spectroscopy (FESEM-EDS), and X-ray photoelectron spectroscopy (XPS). The micro-flotation results demonstrate that the flotability of stainless steel ground cassiterite surpasses that of ceramic. The laser particle size distribution test reveals that the two grinding media do not have a strong impact on the particle size distribution. The ICP-OES and chemical element analysis results identify the higher iron content in the samples and pulp of stainless steel ground cassiterite as the principle influencing factor. The zeta potential analysis indicates that the dissolved iron ions absorbed on the cassiterite surface results in a positive shift of the mineral surface potential. This not only reduces electrostatic repulsion but also increases the active sites of salicylhydroxamic acid (SHA) chemisorption. FESEM-EDS results demonstrate the rougher surface and higher iron content of the stainless steel ground cassiterite compared to the ceramic ground cassiterite, thereby increasing the SHA adsorption. The stainless steel grinding cassiterite was observed to alter the chemical environment of Fe species on the cassiterite surface via XPS analysis, with Fe 2+ exhibiting a stronger reactivity and stability towards SHA compared to Fe 3+ . Thus, the stainless steel media ground cassiterite demonstrates an improved flotability performance compared to the ceramic equivalent.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CULTURAL HERITAGE
·
2022
·
IF 3.229
Minghao Jia,Xiaoxia Huang,Xiaogang Zhang,Gang Hu
Improving the strength decrease caused by fungal metabolites is still an arduous task in the field of paper materials protection. A set of damaged Kangxi Dictionary from Qing Dynasty was chosen as samples in this work. The main goal of this work is to develop high-efficiency and eco-friendly media with the characteristics of antifungal and reinforcement, to preserve paper materials and continue the historical and scientific research value of cultural heritage. PHMG as an efficient antifungal was used in this work. For better behavior, the epoxy group of KH560 can be induced by the amino group in PHMG by ring opening reaction to form PHMG-KH560 colloidal complex. Spraying PHMG-KH560 on paper could establish Si-O-C bonding and increased the hydrogen bond between polymeric material and paper fibers, which simultaneously inhibited fungi and improved mechanical strength of the original paper, even after the artificial aging. PHMG-KH560 had certain antifungal activity against five fungi, such as Aspergillus versicolor, and Aspergillus Niger , and had better inhibitory effect on Cladosporium herbarum, Trichoderma viride , and Penicillium expansum . The ancient writing ink on the paper sprayed with PHMG-KH560 did not affect its visual beauty, which also indicated that the complex reagent was expected to be applied to the antifungal and reinforcement of paper materials.
研究领域:
文物保护
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 114
·94008-94015
·
IF 3.84
Fen Guo,Ke Ye,Xiaomei Huang,Yinyi Gao,Kui Cheng,Guiling Wang,Dianxue Cao
A novel Pd/polyaniline/CFC electrode is prepared by electroless deposition of palladium (Pd) onto three-dimensional polyaniline networks. The polyaniline matrix on the carbon fiber cloth (CFC) in the reduction state is electro-synthesized by cyclic voltammetry and has a lower vertex potential of −0.4 V vs. Ag/AgCl. The particle size of the Pd coated on the polyaniline chains is gradiently distributed. The as-prepared Pd/polyaniline/CFC electrode is characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FITR) and X-ray diffraction (XRD). The hydrogen peroxide (H2O2) electro-reduction reaction in H2SO4 solutions on the Pd/polyaniline/CFC electrode is investigated using cyclic voltammetry (CV), linear sweep voltammetry (LSV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS). The results reveal that the electrode exhibited high catalytic activity and excellent stability in the strong oxidizing solution of H2O2 and H2SO4. Polyaniline itself shows electro-catalytic activity towards H2O2 to some extent involving the chemical–electrochemical (C–E) coupling mechanism.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhongyao Duan,Kai Deng,Chunjie Li,Mei Zhang,Ziqiang Wang,You Xu,Xiaonian Li,Liang Wang,Hongjing Wang
Hydrogen evolution reaction (HER) from water electrolysis in alkaline and neutral media provides a possibility to produce pure hydrogen fuel on a large scale. Therefore, the exploration of highly efficient non-Pt HER electrocatalysts is of great significance. Herein, polyaniline (PANI)-coated mesoporous Rh film on Ni foam is controllably fabricated by a micelle-assisted replacement reaction and the subsequent surface modification. Profiting from the synergetic effect of interconnected mesoporous structure, high electrical conductivity of PANI and the modified electronic structure of Rh, the synthesized mRh@PANI film exhibits superior HER electrocatalytic activity and durability in alkaline and neutral electrolytes. To reach a current density of 50 mA cm −2 , low overpotentials of 37 and 69 mV are required in 1 M KOH and 1 M PBS solutions, respectively.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Reaction Chemistry & Engineering
·
2023
·Vol. 8
·期 9
·2342-2352
·
IF 3.9
Jia Juan,Xue Ping,Liu Xueping,Xu Chongrui,Gu Yaohua,Li Peng
The co-immobilization of laccase and a mediator is essential for water treatment due to the fact that the free laccase and mediator cannot be recovered and reused simultaneously. Herein, a spherical solid biocatalyst, Lac@Ce-GMA-Cu-DA@AS, was prepared via the co-immobilization of laccase and acetosyringone mediator in a functionalized cellulose composite doped with HKUST-1. The Lac@Ce-GMA-Cu-DA@AS microbeads exhibited higher catalytic activity, better reusability and superior degradation efficiency for the substrate compared to the undoped HKUST-1. Specifically, 96% degradation efficiency of carbazole solution with a concentration of 20 mg L−1 was achieved after treatment with 1.0 g (wet weight) of Lac@Ce-GMA-Cu-DA@AS beads for 8 h under the conditions of 30 °C, pH 5.0, and 20 mM ionic strength. Based on the analysis and identification of the degradation intermediates of carbazole, the possible pathways for the degradation of carbazole by the Lac@Ce-GMA-Cu-DA@AS microbeads were proposed. It was found that the toxicity of the carbazole solution was lower after treatment than the original. Natural polymeric cellulose composite doped with HKUST-1 displayed an excellent performance for co-immobilizing laccase–mediator and can provide a practical new approach for the degradation of carbazole pollutant in water.
研究领域:
环境生物学
·
生物催化
·
污染治理
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Rong-Rong Cai,Shu-Zheng Li,Li-Zhi Zhang,Yang Lei
Airborne particulate matter (PM) pollution has raised serious concerns over both the global climate and public health. Therefore, there is an urgent need for air filters of high-efficiency and energy-saving. Pore structure optimization and electret enhancement are feasible means to improve their filtration performance. Herein, a novel sandwich-structured electret composite filter with a low pressure drop and robust filtration stability was successfully designed and fabricated. The composite filter was composed of fluffy PS microfibers with large electric resistivity and high porosity, and PAN nanofibers with high polarity and small pore size. Benefiting from the fluffy structure constructed by electrospinning at the right humidity, the tortuous pore channels created by the appropriate mixing of microfibers and nanofibers, and the abundant static charges generated by the hybrid of polar and nonpolar polymer materials, the PS/PAN/PS composite filter possessed a high filtration efficiency of 99.96% for particles of 0.30 μm, a low pressure drop of 54 Pa and a satisfactory quality factor value of 0.1449 Pa −1 at an airflow velocity of 5.3 cm/s. In particular, the composite filter exhibited better electret stability and PM 2.5 loading performance than the commercial ones, which guarantees its long-term storage and usage.
研究领域:
环境科学
·
材料科学
·
纳米技术
·
空气净化技术
✓ 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）