INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 16
·9362
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IF 6.208
Chenzhi Zhang,Dashuang Wang,Lichao Dong,Kailin Li,Yifan Zhang,Pingan Yang,Shuang Yi,Xingjian Dai,Changqing Yin,Zhilan Du,Xinfang Zhang,Quan Zhou,Zhiyu Yi,Jinsong Rao,Yuxin Zhang
A neoteric round sieve diatomite (De) decorated with sea-urchin-like alpha-type iron trioxide (α-Fe2O3) synthetics was prepared by the hydrothermal method and further calcination. The results of the electromagnetic (EM) parameters of α-Fe2O3-decorated De (α-Fe2O3@D) showed that the minimum reflection loss (RLmin) of α-Fe2O3@D could reach −54.2 dB at 11.52 GHz and the matched absorber thickness was 3 mm. The frequency bandwidth corresponding to the microwave RL value below −20 dB was up to 8.24 GHz (9.76–18 GHz). This indicates that α-Fe2O3@D composite can be a lightweight and stable material; because of the low density of De (1.9–2.3 g/cm3), the density of α-Fe2O3@D composite material is lower than that of α-Fe2O3(5.18 g/cm3). We found that the combination of the magnetic loss of sea-urchin-like α-Fe2O3and the dielectric loss of De has the most dominant role in electromagnetic wave absorption and loss. We focused on comparing the absorbing properties before and after the formation of sea-urchin-like α-Fe2O3and explain in detail the effects of the structure and crystal shape of this novel composite on the absorbing properties.Keywords:diatomite;α-Fe2O3;microwave absorption
研究领域:
材料科学
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电磁学
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DOI
PubMed
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 3
·1055
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IF 4.927
Yifan Zhang,Rui Cai,Dashuang Wang,Kailin Li,Qing Sun,Yuntao Xiao,Hao Teng,Xiaohan Huang,Tao Sun,Zhaohui Liu,Kexin Yao,Yuxin Zhang,Pingan Yang
The porous and biomimetic cobalt silicate@diatomite (Co2SiO4@diatomite) was successfully synthesized by a two-step method, including the hydrothermal method and calcination to improve the electromagnetic wave absorption property. Different hydrothermal times were well-tuned for Co2SiO4@diatomite composites with different loadings of Co2SiO4. Interestingly, the Co2SiO4@diatomite composites (6 h, 25 wt%) had a smaller minimum reflection loss. Moreover, the minimum reflection loss (RLmin) could reach −12.03 dB at 16.64 GHz and the matched absorber thickness was 10 mm, while the effective absorption bandwidth (EAB, RL ≤ −10 dB) could be 1.92 GHz. In principle, such findings indicate that Co2SiO4@diatomite nanocomposites could be a promising candidate for high-efficiency microwave absorption capability.Keywords:diatomite;Co2SiO4;electromagnetic wave absorption;nanomaterial
研究领域:
材料科学
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电磁学
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产品关联
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
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2022
·
IF 5.204
Zhenglong He,Donghua Jia,Lili Wang,Ao Gao,Zhipeng zeng,Xinmeng Wang
To improve the exothermic temperature and flammability of polyurethane foam (PUF), red phosphorus (RP) and diatomite (D) from mechanical milling were chosen as the flame retardants to be incorporated into the polyurethane/waterglass foam (PUHF). The maximum exothermic temperature and temperature distribution of PUF and PUHF were measured using an infrared thermal camera. The morphology and chemical structure of the flame retardants as well as the chemical structure, morphology, compressive strength, thermal stability and flame retardancy of different PUFs were comprehensively investigated by scanning electron microscope, energy dispersive spectrometer, Fourier transform infrared spectroscopy, X-ray diffraction, compression test, thermogravimetric analysis, limiting oxygen index, vertical burning combustion test, cone calorimetry and X-ray photoelectron spectroscopy. The obtained results showed that the maximum exothermic temperature and temperature distribution of PUHF were lower and more uniform than those of PUF. The addition of D increased the dispersion of RP in PUHF, and the uniform and closed pore structures and compressive property were well-retained. Moreover, RP/D/PUHF exhibited excellent thermal stability and flame retardant properties. In addition, a possible flame retardant mechanism of RP/D/PUHF was proposed.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
FIBERS AND POLYMERS
·
2025
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IF 2.3
Jiang Shanshan,Yu Zhijun,Zhu Haixin,Huang Yuewen,Wang Bin
Noise has become a major potential problem in modern society, with a profound impact on human health. There is an urgent need to develop more effective sound-absorbing materials to control noise. In this study, composite foams were prepared by the sacrificial template method combined with non-solvent-induced phase separation using polyvinylidene fluoride (PVDF) as matrix and diatomaceous earth (DE) as filler. The result shows the addition of DE can act as a crystallization site to induce the formation of β phase in the PVDF matrix, thus enhancing the piezoelectricity of the foam. Due to the local piezoelectric effect of PVDF promoted by DE and the high porosity of DE itself, the sound absorption performance of DE/PVDF composite foam was better than that of pure PVDF foam. When the DE was 5 wt%, the noise reduction coefficient of DE/PVDF-2 composite foam was 50% higher than that of pure PVDF foam, and the average sound absorption coefficient (500–6400 Hz) was 38.5% higher. This work successfully prepared a moistureproof, flame-retardant, compression-resistant, and lightweight PVDF composite sound-absorbing foam, which is expected to be a commercial sound-absorbing material. Graphical abstract
研究领域:
材料科学
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声学工程
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DOI
高影响因子
Science China-Technological Sciences
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2022
·Vol. 65
·期 10
·2304-2316
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IF 3.903
Dai Nan,Feng Li,Zhao Li,Song Dan,Dai XingJian,Liu XiaoYing,Zhang YuXin
A one-step hydrothermal method was used to synthesize two-dimensional layered Laponite nanosheets (Laponite@diatomite) in situ on the three-dimensional biological template diatomite. The cationic dye removal ability of Laponite@diatomite with different diatomite content was studied. X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), Fourier transformed-infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and N 2 adsorption-desorption technology were used to characterize synthetic materials. The effects of pH, initial concentration, dynamics, and thermodynamics behavior on the adsorption performance were further studied. La@D-0.1 had the highest adsorption efficiency, and the adsorption rate of methylene blue (MB) solution (450 mg L −1 ) reached 76.7% in the initial 5 min. At the time of adsorption equilibrium (1 h), methylene blue adsorption rate reached 86.4%. The adsorption behavior of La@D-0.1 on MB was characterized by Langumuir isotherm and with better fitting to the quasi-second-order kinetic model curve. By calculating the adsorption process’s thermodynamic parameters, we were able to illustrate that the adsorption process was exothermic. This work provides a novel idea for the synthesis of an economical and ideal, cationic dye nano-adsorbent and provides a potential application for the purification of actual dye wastewater.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 23
·4305
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IF 5.719
Ting Zhang,Jingjing Zhang,Yinghao Yu,Jinxu Li,Zhifang Zhou,Chunlei Li
A new catalyst, copper oxide/graphene oxide–diatomaceous earth (CuO/GO-DE), was prepared by the ultrasonic impregnation method. The optimal conditions for catalyst preparation were explored, and its structure and morphology were characterized by BET, XRD, SEM, TEM, FTIR, Raman and XPS. By taking ciprofloxacin as the target pollutant, the performance and reusability of CuO/GO-DE to degrade antibiotic wastewater was evaluated, and the optimal operating conditions were obtained. The main oxidizing substances in the catalytic system under different pH conditions were analyzed, as well as the synergistic catalytic oxidation mechanism. The intermediate products of ciprofloxacin degradation were identified by LC-MS, and the possible degradation process of ciprofloxacin was proposed.Keywords:diatomaceous earth;graphene oxide;copper oxide;ciprofloxacin;catalytic mechanism
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2021
·Vol. 26
·期 17
·5209
·
IF 4.412
Li Du,Shaonan Xu,Han Wu,Tengwen Zhao,Xuesheng Wang,Manman Wang
A novel diatomite-supported zeolitic imidazolate framework-8 sorbent (ZIF-8@Dt-COOH) was in situ fabricated and developed for solid-phase extraction of three benzodiazepines (triazolam, midazolam and diazepam) in urine followed by high-performance liquid chromatography. ZIF-8@Dt-COOH was easily prepared by coating ZIF-8 on the surface of Dt-COOH and characterized by Fourier transform infrared spectra, X-ray powder diffractometry and scanning electron microscopy. Compared with bare Dt-COOH, the extraction efficiency of ZIF-8@Dt-COOH for the target was significantly increased from 20.1–39.0% to 100%. Main extraction parameters, including ionic strength and pH of solution, loading volume, washing solution, elution solvent and elution volume, were optimized in detail. Under optimum conditions, the developed method gave linearity of three BZDs in 2–500 ng/mL (r≥ 0.9995). Limits of detection (S/N= 3), and limits of quantification (S/N= 10) were 0.3–0.4 ng/mL and 1.0–1.3 ng/mL, respectively. In addition, the average recoveries at three spiked levels (5, 10 and 20 ng/mL) varied from 80.0% to 98.7%, with the intra-day and inter-day precisions of 1.4–5.2% and 1.5–8.2%, respectively. The proposed method provided an effective purification performance and gave the enrichment factors of 24.0–29.6. The proposed method was successfully employed for the accurate and sensitive determination of benzodiazepines in urine.Keywords:benzodiazepines;diatomite;zeolitic imidazolate framework-8;solid-phase extraction;urine
研究领域:
分析化学
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医学检测
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DOI
PubMed
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 4
·643
·
IF 5.3
Can Wang,Kailin Li,Qing Sun,Shijin Zhu,Chenzhi Zhang,Yunhao Zhang,Zhongyi Shi,Youzhong Hu,Yuxin Zhang
Bifunctional materials possess remarkable properties that allow them to store and convert electrical energy easily. In this paper, diatomite-like potassium iron disulfide (KFeS2) was synthesized by a multistep sacrificial template method, and its morphological, electrochemical, and oxygen evolution reaction (OER) properties were investigated. KFeS2was found to be porous, hollow, and cake-like, which suggests a high specific surface area (SSA) and abundant electrochemically active sites. A very high specific capacitance of 651 F g−1at 1.0 A g−1was also obtained due to the substance’s unique structure and high porosity. Additionally, the diatomite-like KFeS2possessed a very low overpotential ƞ10of 254 mV at a current density of 10 mA cm−2and a small Tafel slope of about 48.4 mV dec−1. Thus, the diatomite-like KFeS2demonstrates broad application prospects for both energy storage and conversion.Keywords:KFeS2;diatomite;hydrothermal synthesis;supercapacitors;oxygen evolution reaction
研究领域:
材料科学
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电化学
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DOI
PubMed
高影响因子
RSC Advances
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2022
·Vol. 12
·期 51
·33160-33174
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IF 4.036
Yu Zhou,Zheng Zeng,Yongfu Guo,Xinyu Zheng
A novel diatomite-based mesoporous material of MCM-41/co-(PPy-Tp) was prepared with MCM-41 as carrier and functionalized with the copolymer of pyrrole and thiophene. The physicochemical characteristics of the as-prepared materials were characterized by various characterization means. The removal behaviour of Hg(II) was adequately investigated via series of single factor experiments and some vital influence factors were optimized via response surface methodology method. The results exhibit that diatomite-based materials MCM-41/co-(PPy-Tp) has an optimal adsorption capability of 537.15 mg g−1 towards Hg(II) at pH = 7.1. The removal process of Hg(II) onto MCM-41/co-(PPy-Tp) is controlled by monolayer chemisorption based on the fitting results of pseudo-second-order kinetic and Langmuir models. In addition, the adsorption of Hg(II) ions onto MCM-41/co-(PPy-Tp) is mainly completed through forming a stable complex with N or S atoms in MCM-41/co-(PPy-Tp) by electrostatic attraction and chelation. The as-developed MCM-41/co-(PPy-Tp) displays excellent recyclability and stabilization, has obviously selective adsorption for Hg(II) in the treatment of actual electroplating wastewater. Diatomite-based mesoporous material functionalized by the copolymer of pyrrole and thiophene exhibits promising application prospect.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
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2021
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IF 9.297
Yu-Ting Zhang,Wei Wei,Yun Wang,Bing-Jie Ni
An innovative technology using diatomite to enhance methane production from anaerobic algae digestion was proposed in this study. The results of biochemical methane production (BMP) tests showed that 1, 2, 5 g/L of diatomite addition increased methane production by 22.5 ± 7.1%, 30.6 ± 5.1% and 32.8 ± 7.2% ( p = 0.001, 0.0002, and 0.0002) compared to the control. In continuous operation experiments over 136 days, the parameters of digester containing volatile solid (VS) destruction and daily methane yield were increased by 31.2% and 32.1% with diatomite (5 g/L) addition. The addition of diatomite improved the solubilization , hydrolysis, acidification, and methanation processes in the anaerobic algae digestion, and the abundances of most key microorganisms (e.g., Methanosaeta sp. and Syntrophomonas sp.) involved in anaerobic digestion also increased correspondingly. The mechanism studies revealed that diatomite with strong conductivity could act as an electron shuttle, contributing to the increasing electron transfer efficiency for methane production. The novel strategy proposed in this study might bring significant economic and environmental benefits to algae treatment for energy recovery.
研究领域:
环境科学
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生物技术
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DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2020
·Vol. 17
·期 2
·429
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IF 2.849
Qintao Yang,Liang Gong,Lili Huang,Qinglin Xie,Yijian Zhong,Nanchun Chen
A novel chitosan (CS)-modified diatomite (Dt) was prepared by a simple mixture in the mass ratio to remove As(V) from aqueous solution in this research. The CS-modified Dt adsorbent was characterized by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and X-ray powder diffraction (XRD) analysis. The parameters to influence the adsorption of As(V) ion were studied under such conditions as kinetics, adsorption isotherm, and pH effect. The results revealed that adsorption of As(V) was initially rapid and the equilibrium time was reached after 40 min. The optimal value of the pH was 5.0 for better adsorption. The equilibrium data were well fitted to the Langmuir isotherm compared to the Freundlich isotherm, and exhibited the highest capacity and removal efficiency of 94.3% under an initial As(V) concentration of 5 mg/L. The kinetic data were well described by the pseudo-second-order model. In addition, 0.1 M NaOH has the best desorption efficiency of As(V) adsorbed on CS-modified Dt, and the removal efficiency of As(V) was still higher than 90% when after six adsorption-desorption cycles. These results showed that the CS-modified Dt could be considered as a potential adsorbent for the removal of As(V) in aqueous solution.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
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2024
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IF 4.7
Sun Jianjun,Zhang Zongrui,Yu Mengyun,Xu Weiwei,Bai Guona,Xiang Yixin,Li Mengqun
The utilization of advanced adsorbents for the removal of heavy metal ion pollution from organic dyes and industrial wastewater has garnered significant research interest. In this study, a novel composite gel consisting of chitosan modified diatomite (DE/CS), sodium alginate (SA), and polyethyleneimine (PEI) (DE/CS-PEI@SA) was synthesized using the ion crosslinking method. The composite gels were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry/thermal gravimetric analysis (DSC/TGA), and Brunauer–Emmett–Teller systems (BET). Their adsorption properties and mechanisms towards copper Cu(II) and lead Pb(II) ions were investigated using infrared, X-ray photoelectron spectroscopy (XPS), energy dispersive spectroscopy, (EDS) and Zeta potential analyses. The DE/CS-PEI@SA composite gels exhibited numerous uniform folds on its surface, boasting a specific surface area (18.96 m 2 /g) and a pore size ranging from 1.5 to 80.0 nm, demonstrating robust thermal stability pre- and post- adsorption. Notably, the composite gels demonstrated impressive adsorption capacities for Cu(II) (174.39 mg/g) and Pb(II) (295.04 mg/g), respectively. The incorporation of DE/CS and PEI into the composite gel contributed to a complex pore structure with numerous accessible sites. The adsorption behavior of the composite gel was effectively described by the pseudo-second-order kinetic model and the Langmuir isotherm model. The primary adsorption mechanism was characterized by single-molecule chemisorption, which encompassed coordination adsorption, ion exchange, and electrostatic attraction. Furthermore, the composite gel demonstrated significant efficiency in adsorption, cost-effectiveness, and ease of separation, making it a promising candidate for wastewater treatment applications. Graphical abstract
研究领域:
环境科学
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材料科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）