POLYMER COMPOSITES
·
2021
·Vol. 43
·期 1
·422-429
·
IF 3.171
Zhigang Yuan,Zhicheng Wang,Zhiyi Guo,Yanhui Wang,Jun Wang,Wen-bin Liu,Mehdi Derradji,Jian Qiu
In this study, a kind of novel curing agent composed of acrylic acid and 4,4′-(hexafluoroisopropylidene)bis(p-phenyleneoxy)dianiline was mixed, with different contents of diatomite (CP) particles, into the epoxy resin (E51) to obtain bio-composites that can be rapidly molded and cured at room temperature. Fourier Transform Infrared Spectroscopy and Differential Scanning Calorimetry were used to study the curing behavior of epoxy resin and bio-composites. The influence of CP particle dosages on the mechanical, including tensile, flexural and impact properties, and thermal properties of the prepared composites were discussed. Thermogravimetric analysis result showed that the thermal stability increased with increasing of CP fillers content. Dielectric property tests confirmed that the dielectric constant of composites decreased attributed to the incorporating of novel curing agent and CP fillers with porous structure into epoxy resin. Finally, Scanning Electron Microscope revealed the excellent adhesion between the cured resin and the fillers.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2019
·Vol. 43
·期 13
·7058-7074
·
IF 3.343
Zhiwei Yang,Zijuan Yang,Jinhong Li,Yong Deng,Lijie Liu,Xuezhu Luan,Kaiyue Huang
Summary In this work, diatomite (DM) was calcined at 400°C to obtain the pure surface and pores (DM-1); then, the three kinds of shape-stable composite phase change materials (ss-CPCMs) of CaCl 2 ·6H 2 O (CCH)/DM-1, CH 3 COONa·3H 2 O (SAT)/DM-1, and Na 2 SO 4 ·10H 2 O (SSD)/DM-1 were prepared by impregnation method. The hydrated salts were uniformly adsorbed on the surfaces and into the pores of DM-1 by capillary action and surface tension. The addition of nucleating agent effectively reduced the supercooling degrees of hydrated salts, and the heterogeneous nucleation mechanism was employed to explain the supercooling suppression. The results showed that the supercooling degrees of the three hydrated salt ss-CPCMs with optimal nucleating agent were less than or equal to 0.6°C. Moreover, the thermal conductivities of ss-CPCMs were significantly improved by adding graphite, and the addition of 10 wt% graphite could increase the thermal conductivity of hydrated salt ss-CPCMs by at least 70%. The package capacity of CCH, SAT, and SSD in three ss-CPCMs with appropriate contents of nucleating agent and graphite was 58.1, 56.1, and 56.3 wt%, respectively. The DSC results showed that the phase change temperatures of the three ss-CPCMs were approximately 28.8 to 57.8°C, and the latent heat was approximately 108.7 to 149.4 J/g. The XRD and FT-IR results exhibited that the three ss-CPCMs indicated understanding chemical compatibility. In addition, the results of 200 melt-solidification cycles demonstrated that the ss-CPCMs had excellent thermal cycle reliability. Thus, the hydrated salt/DM-1 ss-CPCMs showed great potential as heat storage materials for various heat storage applications.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2021
·
IF 2.495
Mengfan Wang,Hongliang Xu,Chaoning Huang,Zhentao Cui,Mingliang Li,Bo Song,Gang Shao,Hailong Wang,Hongxia Lu,Rui Zhang
With the aid of mixing melamine and diatomite in hydrochloric acid aqueous solution, g-C 3 N 4 /diatomite (CN/DE- X , X = 2, 4, 6, 10, 14, which represented the mass ratio of melamine to diatomite) composites were synthesized by calcining the mixture at 550℃ for 2 h. Samples were characterized using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscope, X-ray photoelectron spectroscopy, nitrogen adsorption–desorption measurement, ultraviolet–visible diffuse reflectance spectrum, and photoluminescence spectrum, etc. Rhodamine B (RhB) was used as trial pollutant to evaluate the photocatalytic activity of CN/DE- X composites. The results reveal that CN/DE- X composite is composed of g-C 3 N 4 and diatomite. The photocatalytic activities of CN/DE- X composites are much better than that of pure g-C 3 N 4 and varied with X . CN/DE-10 composite owns the best photocatalytic property in this study, which prohibited the agglomeration of g-C 3 N 4 and had a specific surface area of 47.03 m 2 /g. 100 mg CN/DE-10 degraded more than 95% of RhB solution (10 mg/L, 100 mL) in 50 min, and its reaction rate constant was about 6.4 times that of pure g-C 3 N 4 . CN/DE-10 presents satisfactory stability and reusability since it degraded 90.01% of RhB molecules after 5 cycles of photocatalytic reaction. The outstanding photocatalytic performance of CN/DE-10 is attributed to the enhanced specific surface area, improved UV–Vis light absorption ability, narrowed band gap, reduced recombination rate of the photo-generated electrons and holes, which are brought about by the evenly anchoring of large amount of g-C 3 N 4 on the surface of diatomite.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 18
·4336
·
IF 4.2
Yan Liao,Dashuang Wang,Wenrui Zhu,Zhilan Du,Fanbo Gong,Tuo Ping,Jinsong Rao,Yuxin Zhang,Xiaoying Liu
Transition metal oxides have been widely used in microwave-absorbing materials, but how to improve impedance matching is still an urgent problem. Therefore, we introduced urea as a polymer carbon source into a three-dimensional porous structure modified by Co3O4nanoparticles and explored the influence of different heat treatment temperatures on the wave absorption properties of the composite. The nanomaterials, when calcined at a temperature of 450 °C, exhibited excellent microwave absorption capabilities. Specifically, at an optimized thickness of 9 mm, they achieved a minimum reflection loss (RLmin) of −97.3 dB, accompanied by an effective absorption bandwidth (EAB) of 9.83 GHz that comprehensively covered both the S and Ku frequency bands. On the other hand, with a thickness of 3 mm, the RLminwas recorded as −17.9 dB, with an EAB of 5.53 GHz. This excellent performance is attributed to the multi-facial polarization and multiple reflections induced by the magnetic loss capability of Co3O4nanoparticles, the electrical conductivity of C, and the unique three-dimensional structure of diatomite. For the future development of bio-based microwave absorption, this work provides a methodology and strategy.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Peng Xu,Xiang Li,Rui Wei,Chunyan Yang,Tianyao Shen,Peng Wang,Guangshan Zhang
The adaptability and stability of catalysts guarantee efficient catalytic performance. Hence, we fabricated FeCo 2 O 4 /diatomite for efficient peroxymonosulfate (PMS) activation. Distinct from stacked FeCo 2 O 4 , FeCo 2 O 4 /diatomite possessed a 1.2-fold larger specific surface area (94.84 m 2 g −1 ), achieving 100% ATZ removal within 10 min at 0.2 g L −1 PMS and 0.1 g L −1 FeCo 2 O 4 /diatomite. The system could adapt to a broad pH range (3–11) and complex water matrices, efficiently removing multiple contaminants. High removal performance (>92%) and mineralization (>57%) were maintained after six cycles with minimal leached Co (0.10 mg L −1 ). The conversion between ≡Fe(III)/≡Fe(II) and ≡Co(III)/≡Co(II) could trigger PMS persistently, producing abundant active species, in which SO 4 •− was dominant. Then, intermediates and degradation pathways were proposed based on DFT calculations and ESI-QTOF-MS/MS data. Toxicity analysis showed that most intermediates were more eco-friendly than ATZ. This study developed FeCo 2 O 4 /diatomite with superior catalytic performance, high adaptability, and stability for eliminating refractory organic pollutants.
研究领域:
环境科学
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2016
·
IF 1.272
Guangxin Zhang,Bin Wang,Zhiming Sun,Shuilin Zheng,Shushu Liu
Three kinds of diatomites as catalyst carriers were adopted to prepare supported TiO2 catalysts by a typical hydrolysis–deposition method. The prepared composites were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, N2 adsorption–desorption, scanning electron microscopy transmission electron microscopy, UV–vis diffuser reflectance, and chemical oxygen demand. The photocatalytic properties of composites were determined using rhodamine B, methyl orange, and methylene blue as target pollutants under UV light irradiation. A comparative study on the photocatalytic properties of composite catalysts was carried out. It is indicated that the catalytic performance of TiO2/diatomite is significantly influenced by the physicochemical properties of diatomite supports. Compared with pure TiO2, the TiO2/diatomite composites exhibited smaller crystalline size of TiO2 and better dispersibility, which induced higher specific surface area and better photo-degradation efficiency. The highest activity of the photocatalyst should be attributed to the acid-activated support, which provided more active sites for the degradation reaction. Besides, the durabilities of catalysts were also investigated. The experimental results indicated that the prepared composite is a promising material for the wastewater treatment for its good photocatalytic property and reusability.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Fang Yuan,Renfeng Yang,Chunquan Li,Xiangwei Zhang,Zhiming Sun
How to improve the photocatalytic performance of titania-based photocatalyst under visible light in environmental remediation remains a challenge. Herein, three kinds of bismuth semiconductors, including Bi 2 MoO 6 , BiOCl and BiVO 4 , are selected to construct heterojunctions with diatomite supporting titania for improving photocatalytic performance towards formaldehyde (HCHO) under visible light. The morphologies and microstructures as well as the photocatalytic performance of the as-received samples are systematically investigated for comparation. The Bi 2 MoO 6 -TiO 2 /diatomite (MTD-50) composite has the optimal performance, followed by BiOCl-TiO 2 /diatomite (CTD-100) composite and BiVO 4 -TiO 2 /diatomite (VTD-75) composite, whose mineralization rate is up to around 47.58 times, 29.55 times and 21.14 times that of TiO 2 /diatomite (TD) composite, respectively. Moreover, the performance enhancement mechanism could be attributed to their relatively high quantum efficiency that originated from the heterojunctions, resulting in the high generation efficiency of active radicals. This work would like to compare bismuth semiconductor photocatalysts for enhancing visible-light properties through heterojunction and provide comparative references for developing novel visible light driven photocatalysts in the field of indoor HCHO purification.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Nan Dai,Shuang Yi,Xiaotian Zhang,Li Feng,Hui Ding,Dan Song,Xiaoying Liu,Jinsong Rao,Yuxin Zhang
A typical adsorption modification method was employed to load ferrous ions on the Laponite@diatomite composite with 3D-2D morphology for photo-Fenton. Further, various characterization analyses were performed on the microscopic morphology and structure of the modified Laponite@diatomite. The removal ability of ferrous ion-modified Laponite@diatomite (Fe-La@D) photo-Fenton-oxidative cationic dyes under different raw material concentrations, H 2 O 2 content, MO concentration and light environment was discussed. Its reusability and photo-Fenton mechanism were further investigated. The study found that the ferrous ion-modified Laponite @diatomite is a catalyst with good photo-Fenton performance, and the MO degradation rate in 240 min can reach 99 % under the optimal reaction conditions. After modification, ferrous ions were successfully intercalated between the Laponite layers, and the forbidden band width of the material was reduced. And with the increase of catalyst dosage and H 2 O 2 content, the photo-Fenton reaction rate also increases. While the initial concentration of MO increases, the reaction rate decreases accordingly. Cycling tests demonstrate the structural stability and reusability of the catalyst. EPR spectra showed the generation of hydroxyl radicals , which are important substances in the degradation process. This work provides an idea for the synthesis of economical and ideal photo-Fenton catalysts, which has broad application prospects.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Jing Chen,Qifang Ren,Chunshan Xu,Bin Chen,Shaohua Chen,Yi Ding,Zhen Jin,Wanmi Guo,Xinyu Jia
In this study, Ag 2 O/BiVO 4 /diatomite composite with p-n heterojunction structure was synthesized by simple hydrothermal method with diatomite as carrier. It was found that under the action of hydrogen peroxide (H 2 O 2 ), the imidacloprid (IMD) could be effectively degraded by the composite. Systemic evaluations was conducted on effects of pH value, catalyst dosage, H 2 O 2 concentration, initial IMD concentration, and anion on how effeciently this new photocatalytic composite can degrade IMD. The results show that the p-n heterojunction formed between the two contact surfaces of Ag 2 O nanoparticle and BiVO 4 promotes the charge transfer between the interfaces, inhibits recombination of electrons and holes, and thus significantly improves the catalytic performance. The stability and reusability of Ag 2 O/BiVO 4 /diatomite composites were tested with ICP experiment and cyclic experiment. Active substance capture experiment and ESR reveal the photocatalytic reaction mechanism and confirm that superoxide radical ( O 2 − ), hydroxyl radical ( OH), and h + can promote the degradation of IMD. The degradation products and the intermediates of IMD were identified through LC-MS, on a basis of which the possible transformation pathway was proposed. In situ synthesis of p-type Ag 2 O and n-type BiVO 4 heterojunction composites has opened a new direction for photocatalytic degradation of organic pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Nan Dai,Xinyi Liu,Lei Yang,Xi Huang,Dan Song,Song Wang,Kai Zhang,Xiaoying Liu,Wenxin Dong,Yuxin Zhang
This work aims to enhance the adsorption performance of Laponite @diatomite for organic pollutants by modifying it with cetyltrimethylammonium bromide (CTAB). The microstructure and morphology of the CTAB-modified Laponite @diatomite material were characterized using SEM, XRD, FTIR, BET, and TG. Furthermore, the influences of key parameters, containing pH, adsorbent dosage, reaction time, and reaction temperature, on the adsorption process were investigated. The kinetics, thermodynamics, and isotherm models of the adsorption process were analyzed. Finally, potential adsorption mechanisms were given based on the characterization. The research findings indicate that CTAB-La@D exhibits good adsorption performance toward Congo red (CR) over a broad pH range. The maximum adsorption capacity of CR was 451.1 mg/g under the optimum conditions (dosage = 10 mg, contact time = 240 min, initial CR concentration = 100 mg/L, temperature = 25 °C, and pH = 7). The adsorption process conformed to the pseudo-second-order kinetic model, and the adsorption isotherms indicated that the adsorption process of CR was more in line with the Langmuir model, and it was physical adsorption. Thermodynamic analysis illustrates that the adsorption process is exothermic and spontaneous. Additionally, the mechanisms of electrostatic adsorption and hydrophobic effect adsorption of CR were investigated through XPS and FTIR analysis. This work provides an effective pathway for designing high-performance adsorbents for the removal of organic dye, and the synthesized materials hold great capability for practical utilization in the treatment of wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Pan Zhang,Yuanyuan Cui,Kaiqiang Zhang,Sainan Wu,Dongchu Chen,Yanfeng Gao
The inherent leakage of molten paraffin during the solid-liquid transition and the immature state of industrial technology currently limit its practical applications for temperature regulation in smart energy-saving buildings. Here, a 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane modification of diatomite with an oleophobic surface was used as a supporting material of molten paraffin for enhancing thermal storage capacity of paraffin/diatomite composite. The results show that an optimal encapsulation ratio of the paraffin/diatomite composite is up to 84.5%, with excellent thermal reliability after a 50-cycle of melting and freezing. The simulation test demonstrates that the indoor temperature is reduced by 5.3 °C in a phase change material room with the paraffin/diatomite composite window as compared to that of an ordinary simulation room. Diatomite with oleophobic surface as a molten paraffin supporting material is effective in improving the thermal storage capacity of the composite. The paraffin/diatomite composite is a potential material with the applications in energy-saving buildings.
研究领域:
材料科学
·
能源工程
·
建筑技术
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2022
·Vol. 14
·期 29
·2849-2856
·
IF 3.532
Leiwenxuan Yang,Gaohua Hu,Yali Huang,Chen Wang,Xin Liu,Chengyin Lu,Hongping Chen,Jianyang Zhang,Guicen Ma
Sulfites are used widely in food and beverage production to prevent browning or oxidation. However, the overingestion of sulfites is harmful to human health and may cause medical complications. Chinese herbal teas have been widely consumed for centuries. However, sulfite levels in Chinese herbal teas are rarely investigated and reported. Here, we present a simple, sensitive, and quantitative method to determine sulfites in Chinese herbal teas using ultrahigh-performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) coupled with dispersive solid phase extraction. The method utilized a SeQuant ZIC-HILIC column for separation, and the optimal gradient eluents consisted of acetonitrile and aqueous solution with 0.1% acetic acid and 10 mM ammonium acetate. Porous chitosan/partially reduced graphene oxide/diatomite (CS/prGO/DM) composites were used as efficient dispersive solid phase extraction adsorbents for sample preparation. Several parameters were investigated during the extraction process, including sample-to-extraction solvent volume ratios, the extraction procedure and dosage of the adsorbent. Under the optimum conditions, the developed method gave a good determination coefficient (r2 > 0.99), low detection limits (0.51–12.1 μg kg−1) and high recoveries in the range of 83.8–102.7% at different spiked levels. The method has the great advantages of being time saving, good reproducibility and much lower detection limits when compared to titration methods. The method was further applied to analyze real herbal tea samples collected from the local market, demonstrating that our developed method is robust and useful for determining sulfites in practical application.
研究领域:
食品科学
·
分析化学
✓ 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）