Preparation of in-situ modified diatomite and its application in papermaking

Fan, Zhitian; Li, Zheng; Qi, Wei; Zhao, Shuting; Zhou, B.; Liu, Songyan; Tian, Yumei

doi:10.1016/j.colsurfa.2022.130582

Cited by 7 publications

(3 citation statements)

References 41 publications

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“…Diatomite, primarily composed of opal (SiO 2 H 2 O), is a kind of non-metallic mineral formed through extended geological processes by unicellular algae, containing metal oxide impurities, such as Al 2 O 3 , Fe 2 O 3 , CaO, MgO (Yuan et al, 2007). In recent years, diatomite-based functional materials have attracted growing interest owing to its well-developed mesoporous/macroporous structures, stable chemical properties, and good adsorption performance (Yuan et al, 2023;Fan et al, 2023;Huang et al, 2023). Up to now, diatomite has been extensively used as lter aids , llers (Zhang, Wang, & Song, 2019; Du et al, 2022), catalysts carriers (Yuan et al, 2022) and building materials (Luan et al, 2019), etc.…”

Section: Introductionmentioning

confidence: 99%

Controllable Preparation of Zeolite-P/Calcined Diatomite with MgCl2

Guo,

Ren,

Gao

et al. 2024

Korean J. Chem. Eng.

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Developing highly e cient calcined diatomite (C-D)-based lter aids with excellent adsorption performance is of great signi cance. Herein, Zeolite-P was successfully synthesized on the surface of C-D through hydrothermal modi cation with NaOH and MgCl 2 as e cient morphology control agents. The optimal Zeolite-P/C-D material perfectly retained the diatomite structure and showed a whiteness of 83.36% and a high speci c surface area of 237.47 m 2 /g, leading to an excellent adsorption capacity for methylene blue trihydrate (MB) of 125.46 mg/g and a good permeability of 0.43 darcy. The porous brous microspheres Zeolite-P was synthesized on the surface of C-D under controlled conditions to improve the adsorption performance of Zeolite-P/C-D material. By developing diatomite-based composites for lter aids applications, this study paves the way for the comprehensive and e cient utilization of low-cost diatomite resources.

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Section: Introductionmentioning

confidence: 99%

Controllable Preparation of Zeolite-P/Calcined Diatomite with MgCl2

Guo,

Ren,

Gao

et al. 2024

Korean J. Chem. Eng.

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“…23 Considering the porous surface, high porosity, lightweight, large specific surface area, high tensile strength, low cost, high-temperature resistance, and non-toxicity, of diatomite, it can be used as a natural reinforcing filler for many polymers. [24][25][26] However, considering its porous nature, diatomite is well dispersed in the polymer matrix. which may increase the mechanical strength of the composites.…”

Section: Introductionmentioning

confidence: 99%

Modification mechanism of modified diatomite with flexible amine‐based structure as a filler of epoxy resin and mechanical properties and curing kinetic of composites

Wang,

Lou,

et al. 2023

Polymer Composites

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In this study, the binding of amine‐based hyperbranched macromolecular polyethyleneimine (PEI) to diatomite (DE) was carried out by using the silane coupling agent KH560 (PEI‐KH560‐DE). Fourier infrared spectroscopy, scanning electron microscopy were used to characterize the structure of the modified DE. Then, the composites were prepared using PEI‐KH560‐DE as the filler in the epoxy resin matrix and then cured with dimethylimidazole. The cured composites were tested for impact resistance, flexural properties, and tensile properties, and then subjected to DSC. The experimental results showed that when different proportions of diatomite or modified diatomite were added to the epoxy resin matrix, the strength and toughness of the composites could be significantly enhanced. When the content of PEI‐KH560‐DE was 15 wt%, the impact strength of the composites reached the maximum value of 5.39 kJ/m2, which was 156.67% higher than that of the pure epoxy resin (2.10 kJ/m2). The tensile strength was also improved from 16.38 MPa of the pure epoxy resin to 26.55 MPa, corresponding to an increase of 62.09%. With the addition of modified diatomite, the Tdmax and char yield of the composites were significantly enhanced, indicating that the addition of diatomite can enhance the heat resistance and thermal stability of the composites. The curing kinetics study showed that the addition of PEI‐KH560‐DE can significantly reduce the apparent activation energy required for the curing reaction of epoxy resin probably due to the presence of amine group in PEI, which plays a role in promoting the curing behavior.Highlights Amine groups and flexible chain segments were introduced into diatomite. Mechanism of polyethyleneimine‐modified diatomite was investigated. Improved mechanical and thermal properties of PEI‐KH560‐DE/EP composites. Curing kinetics showed that amine groups reduce apparent activation energy.

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“…Diatomite is widely used in construction [1], petroleum [2], the light industry [3][4][5], the chemical industry [6], and other fields [7][8][9], with its unique physical and chemical properties, such as multi-level pore structure [10] and nano characteristics [11], making high-grade diatomite resources increasingly scarce [12]. There has been less development and utilization of low-grade diatomite, resulting in a serious waste of resources and great pressure on the environment.…”

Section: Introductionmentioning

confidence: 99%

Integrated Nanostructures of TiO2/g-C3N4/Diatomite Based on Low-Grade Diatomite as Efficient Catalyst for Photocatalytic Degradation of Methylene Blue: Performance and Mechanism

Junxia

Cheng

et al. 2023

Catalysts

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The comprehensive utilization of low-grade diatomite resources and the effective treatment of printing and dyeing wastewater have attracted widespread attention. The combined scrubbing-magnetic separation-acid leaching-roasting process was used to increase the SiO2 content from 59.22% to 86.93%, reduce the Al2O3 content from 18.32% to 6.75%, and reduce the Fe2O3 content from 6.85% to 1.24% in the low-grade diatomite from Heilongjiang, China. The TiO2/g-C3N4/diatomite nanocomposite was prepared by a facile ultrasonic-thermal polymerization method. In this ternary structure, diatomite skeleton effectively increased the surface area with abundant adsorption sites, prevented g-C3N4 from restacking, and facilitated the separation of electrons and holes via the formation of TiO2/g-C3N4 heterojunctions. The degradation rate was 98.77%, 90.59%, and 89.16% for the three catalytic reaction cycles of the MB solution, respectively. The composite showed a high degradation rate of the MB solution after three cycles, which indicated that the composite had good recyclability. Through the free radical capture test, it was elucidated that O2−·, h+, and ·OH all played a role in the photocatalytic reaction of the TiO2/g-C3N4/diatomite to the MB solution, in which O2−· was mainly responsible for the photocatalytic oxidation mechanism, and the reaction kinetics were further investigated. This nanostructured TiO2/g-C3N4/diatomite composite has fascinating visible light catalytic activity and excellent stability.

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Preparation of in-situ modified diatomite and its application in papermaking

Cited by 7 publications

References 41 publications

Controllable Preparation of Zeolite-P/Calcined Diatomite with MgCl2

Controllable Preparation of Zeolite-P/Calcined Diatomite with MgCl2

Modification mechanism of modified diatomite with flexible amine‐based structure as a filler of epoxy resin and mechanical properties and curing kinetic of composites

Integrated Nanostructures of TiO2/g-C3N4/Diatomite Based on Low-Grade Diatomite as Efficient Catalyst for Photocatalytic Degradation of Methylene Blue: Performance and Mechanism

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