Preparation of high silica microporous zeolite SSZ-13 using solid waste silica fume as silica source

Information of rheological behavior of binder paste is important for proportioning high slump concrete mixture at low water to cement ratios. This paper presents experimental data on the rheological property of silica colloid incorporated binder paste using naphthalene based and polycarboxylate based superplasticizer, compared to that of silica fume incorporated binder paste. Experimental data showed that silica colloid incorporated binder is compatible to tested superplasticizers in the all investigated range of silica colloid content, whereas the pastes incorporated with high silica fume content (over 10%) indicated incompatibility, especially to naphthalene based superplasticizer. There was also found out saturated content of superplasticizer corresponding to every kind of binder and water-binder ratio, with and without set retarding admixture.

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Agricultural Waste As Silica Source In Tio2/Sio2 Synthesis For Photocatalytic Degradation Of Dye Compounds

Khazanah ◽

10.20885/khazanah.vol12.iss2.art1 ◽

2020 ◽

Vol 12 (2) ◽

Author(s):

Nawwal Hikmah ◽

◽

Dewi Agustiningsih ◽

Elma Retna Dewi ◽

Nyayu Shafiyah Mahira ◽

...

Keyword(s):

Charge Carrier ◽

Photocatalytic Degradation ◽

Surface Area ◽

Agricultural Waste ◽

Tio2 Particle ◽

Silica Content ◽

Silica Source ◽

The Matrix ◽

High Silica ◽

Hazardous Organic Compounds

Titanium dioxide (TiO2) is one of semiconductor material which has been used as photocatalyst that has very good potency to oxidize some hazardous organic compounds like dye waste, medical and pharmacological waste, and etc. Although TiO2 has high oxidation capacity for photocatalytic degradation, it has some deficiencies which can limit its application as photocatalyst. Those deficiencies are TiO2 is easily agglomerated, its charge carrier is conveniently formed as recombination, and it has low surface area. This article provides a review of a composite which consists of TiO2 as the dispersed phase and SiO2 as the matrix, this composite has better photacatalytic performance than TiO2 itself. SiO2 can increase the surface area of TiO2, prevent the agglomeration of TiO2 particle, and avoid the recombination of TiO2’s charge carrier. Consequently, it can improve the ability of TiO2 to do photocatalytic degradation. Agricultural wastes that consist of high silica content is potentially used as the resource of SiO2 in this composite and biosilica that is produced from natural waste has biocompatible and biodegradable properties. This article also provides it’s application for various dye photocatalytic degradation.

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Low Concentration Synthesis of Super-Amphiphilic Nanoflake ZSM-5 Film with Adjustable Property

NANO ◽

10.1142/s1793292020501246 ◽

2020 ◽

Vol 15 (10) ◽

pp. 2050124

Author(s):

Fei Tong ◽

Jie Gong ◽

Hengfei Qin ◽

Jinlong Jiang ◽

Lixiong Zhang

Keyword(s):

Sol Gel ◽

Dip Coating ◽

Hydrophobic Property ◽

Low Concentration ◽

Silica Source ◽

High Silica ◽

Slide Show ◽

Zeolite Films ◽

Synthesis Solution

High silica zeolite ZSM-5/glass film was successfully synthesized by an in-situ sol–gel dip-coating process combined with the steam-assisted conversion (SAC) technique with low concentration of the synthesis solution. The resulting zeolite films grown on the glass slide show amphiphilic properties. The growing process and the effect of the concentration of SiO2 in the silica source were examined. The mechanism of the formation of the nanoflake crystals and their wetting behavior was investigated. By simply adding fluorescein in the synthesis solution during the preparation, ZSM-5 films showing luminescence property can be obtained. Furthermore, these ZSM-5 zeolite films are easily modified to exhibit hydrophobic property.

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Fast Synthesis of High-Silica ZSM-5 Zeolite via a Simple Vapor-Phase Transport Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.634-638.2184 ◽

2013 ◽

Vol 634-638 ◽

pp. 2184-2188

Author(s):

Qing Yang Meng ◽

Jin Yang Chen ◽

Xiao Wei Cheng ◽

Ying Cai Long

Keyword(s):

Vapor Phase ◽

Vapor Phase Transport ◽

Factors Affecting ◽

Precipitated Silica ◽

Silica Source ◽

Vapor Phase Transport Method ◽

Ft Ir ◽

High Silica ◽

Phase Transport ◽

Fast Synthesis

Fast synthesis of high-silica ZSM-5 zeolite through vapor-phase transport (VPT) method was reported in this paper. The synthesized samples were characterized with XRD, FT-IR, XRF, SEM and N2 Absorption. Factors affecting the synthesis of ZSM-5 zeolite such as the alkalinity, the crystallization temperature and time, the quantity of seeds were investigated. With precipitated silica and fumed silica as silica source respectively, the appropriate ratio was studied as follows: (0.04-0.05) Na2O: 1.0SiO2: 15H2O: (0-0.0046)Al2O3: 0.01Seed, the reaction was carried out at 393-413K for 4-24h.

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Synthesis of Mesoporous Silica Microspheres by PICA and Pseudomorphic Transformation Using Silica Fume as Silica Source

Materials Science Forum ◽

10.4028/www.scientific.net/msf.809-810.207 ◽

2014 ◽

Vol 809-810 ◽

pp. 207-212

Author(s):

Jia Li He ◽

Xiu Hua Chen ◽

Wen Jie Zhu ◽

Wen Hui Ma ◽

Yong Yin Xiao ◽

...

Keyword(s):

Mesoporous Silica ◽

Silica Fume ◽

Average Pore Size ◽

Sorption Isotherms ◽

Total Pore Volume ◽

Bet Surface Area ◽

Silica Microspheres ◽

Average Pore ◽

Silica Source ◽

Mesoporous Silica Microspheres

Monodisperse mesoporous silica microspheres (MSM-SF) were successfully prepared through PICA and pseudomorphic transformation using silica fume as original silica source. The structure and morphology of spheres were quantitatively investigated by Zata potential and particle size analyzer, N2 sorption isotherms, XRD, SEM and TEM. The results showed that the monodisperse spherical mesoporous silica microspheres (MSM-SF) exhibited uniform spherical morphology, worm-like mesoporous, large BET surface area of 559.9m2/g; its BJH average pore size diameter and total pore volume are 3.3nm and 0.12cm3/g, respectively. This preparation method provides a new synthetic strategy to control the particle morphology and structure simultaneously, meanwhile this method can also significantly reduce the cost of synthesis of mesoporous silica microspheres.

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Effect of Modified Silica Fume Using MPTMS for the Enhanced EPDM Foam Insulation

Polymers ◽

10.3390/polym13172996 ◽

2021 ◽

Vol 13 (17) ◽

pp. 2996

Author(s):

Rudeerat Suntako

Keyword(s):

Calcium Carbonate ◽

Silica Fume ◽

Ethylene Propylene Diene Monomer ◽

Modified Silica ◽

Maximum Torque ◽

Compression Set ◽

Silica Concentration ◽

Cure Time ◽

High Silica ◽

Surface Modified

Silica fume (SF) is a by-product from the production of silicon metal, which has a relatively high silica concentration. The surface modified silica fume (mSF) is treated with (3-mercaptopropyl) trimethoxysilane (MPTMS) as filler in ethylene propylene diene monomer (EPDM) foam. The FTIR spectra of mSF clearly indicated that MPTMS can be successfully bonded to the SF surface. The reinforcing efficiency of mSF-filled EPDM foam insulation indicated that the mechanical properties such as hardness, tensile strength, modulus, and compression set enhanced higher than in case of SF and calcium carbonate. While the cure characteristics such as the maximum torque (MH), the minimum torque (ML) and the differential torque (MH-ML) are increasing in proportion to increasing filler contents, mainly with mSF. For the cure behavior, the mSF-filled EPDM foam insulation showed the fastest cure time (tc90) and scorch time (ts2) due to reduced accelerator adsorption. Whereas, the calcium carbonate-filled EPDM foam insulation increased the cure time (tc90) and scorch time (ts2), therefore, it also prevents compound scorching. The results indicated that the mSF with MPTMS can be used as an alternative filler for EPDM foam insulation.

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Using silica fume as silica source for synthesizing spherical ordered mesoporous silica

Materials Letters ◽

10.1016/j.matlet.2012.10.044 ◽

2013 ◽

Vol 92 ◽

pp. 129-131 ◽

Cited By ~ 23

Author(s):

Wenjie Zhu ◽

Yang zhou ◽

Wenhui Ma ◽

Mingming Li ◽

Jie Yu ◽

...

Keyword(s):

Mesoporous Silica ◽

Silica Fume ◽

Ordered Mesoporous Silica ◽

Silica Source ◽

Ordered Mesoporous

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Early-Age Hydration Reaction and Strength Formation Mechanism of Solid Waste Silica Fume Modified Concrete

Molecules ◽

10.3390/molecules26185663 ◽

2021 ◽

Vol 26 (18) ◽

pp. 5663

Author(s):

Tao Luo ◽

Cheng Hua ◽

Qiang Sun ◽

Liyun Tang ◽

Yu Yi ◽

...

Keyword(s):

Compressive Strength ◽

Fly Ash ◽

Solid Waste ◽

Silica Fume ◽

Morphological Characteristics ◽

Early Age ◽

Hydration Reaction ◽

Compressive Strength Of Concrete ◽

Early Age Hydration ◽

Lf Nmr

Solid waste silica fume was used to replace fly ash by different ratios to study the early-age hydration reaction and strength formation mechanism of concrete. The change pattern of moisture content in different phases and micro morphological characteristics of concrete at early age were analyzed by low field nuclear magnetic resonance (LF-NMR) and scanning electron microscope (SEM). The results showed that the compressive strength of concrete was enhanced optimally when the replacement ratio of solid waste silica fume was 50%. The results of LF-NMR analysis showed that the water content of modified concrete increased with the increase of solid waste silica fume content. The compressive strength of concrete grew faster within the curing age of 7 d, which means the hydration process of concrete was also faster. The micro morphological characteristics obtained by SEM revealed that the concrete was densest internally when 50% fly ash was replaced by the solid waste silica fume, which was better than the other contents.

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