Experimental and numerical investigation of the effect of ultrasound on the growth kinetics of zeolite A

Dewes, Ruben M; Mendoza, Heidy Ramirez; Pereira, Mafalda Valdez Lancinha; Lutz, Cécile; Gerven, Tom Van

doi:10.1016/j.ultsonch.2022.105909

Cited by 11 publications

(3 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…RFX exhibits a broader particle size distribution with larger particles compared to MX1 and MC4, which were prepared with the same molar ratios and drying process. RFX, prepared without sonication, showed a larger particle size, which is consistent with the findings of [ 57 ].…”

Section: Resultssupporting

confidence: 91%

The Development of Fe3O4-Monolithic Resorcinol-Formaldehyde Carbon Xerogels Using Ultrasonic-Assisted Synthesis for Arsenic Removal of Drinking Water

Khamkure,

Gamero-Melo,

Garrido-Hoyos

et al. 2023

Gels

View full text Add to dashboard Cite

Inorganic arsenic in drinking water from groundwater sources is one of the potential causes of arsenic-contaminated environments, and it is highly toxic to human health even at low concentrations. The purpose of this study was to develop a magnetic adsorbent capable of removing arsenic from water. Fe3O4-monolithic resorcinol-formaldehyde carbon xerogels are a type of porous material that forms when resorcinol and formaldehyde (RF) react to form a polymer network, which is then cross-linked with magnetite. Sonication-assisted direct and indirect methods were investigated for loading Fe3O4 and achieving optimal mixing and dispersion of Fe3O4 in the RF solution. Variations of the molar ratios of the catalyst (R/C = 50, 100, 150, and 200), water (R/W = 0.04 and 0.05), and Fe3O4 (M/R = 0.01, 0.03, 0.05, 0.1, 0.15, and 0.2), and thermal treatment were applied to evaluate their textural properties and adsorption capacities. Magnetic carbon xerogel monoliths (MXRF600) using indirect sonication were pyrolyzed at 600 °C for 6 h with a nitrogen gas flow in the tube furnace. Nanoporous carbon xerogels with a high surface area (292 m2/g) and magnetic properties were obtained. The maximum monolayer adsorption capacity of As(III) and As(V) was 694.3 µg/g and 1720.3 µg/g, respectively. The incorporation of magnetite in the xerogel structure was physical, without participation in the polycondensation reaction, as confirmed by XRD, FTIR, and SEM analysis. Therefore, Fe3O4-monolithic resorcinol-formaldehyde carbon xerogels were developed as a potential adsorbent for the effective removal of arsenic with low and high ranges of As(III) and As(V) concentrations from groundwater.

show abstract

Section: Resultssupporting

confidence: 91%

The Development of Fe3O4-Monolithic Resorcinol-Formaldehyde Carbon Xerogels Using Ultrasonic-Assisted Synthesis for Arsenic Removal of Drinking Water

Khamkure,

Gamero-Melo,

Garrido-Hoyos

et al. 2023

Gels

View full text Add to dashboard Cite

show abstract

“…•OH＋•H→H2O (10) [50] Figure 6 Schematic illustration of radicalized seed assisted synthesis of zeolite ECR-1 [50] 解决煤矸石积累和污染问题, 同时也提高了煤矸石的附加值. Han 等 [54] 图 7 超声波辐射辅助 ZSM-5 合成的示意图 [55] Figure 7 Schematic illustration of ultrasonic radiation assisted synthesis of ZSM-5 [55] 化学学报综述 Dewes 等 [56] 使用不同功率的超声波辐射辅助 NaA 沸石的合成, 并使用 Gualtieri 动力学模型研究了其结晶过程. 在固定 10 min 的处理时间后, NaA 沸石在超声波辐射功率为 0.…”

Section: 超声波辐射辅助生成•Ohunclassified

Advances in Hydroxyl Free Radical Assisted Synthesis of Zeolite

Zhang¹,

Lan²,

Cheng³

2023

Acta Chimica Sinica

View full text Add to dashboard Cite

As one of the most important solid catalysts in chemical industry, zeolites are widely used in different fields. How to prepare zeolites greenly and efficiently has become a research hot issue with the increase of consumption year by year. Hydroxyl free radical is a highly active species, which can promote the depolymerization and repolymerization of aluminosilicates in the zeolite initial gel, and then accelerating the zeolite crystallization process. Besides accelerating the crystallization of zeolite, many studies have shown hydroxyl free radicals have other functions in zeolite synthesis. In this review, the role of hydroxyl free radicals in the synthesis of zeolites is systematically introduced via different generation methods. The challenges of the hydroxyl free radical assisted strategy are put forward, and its development directions are prospected. Keywords zeolite; hydroxyl free radical; structure directing agent; synthesis; acceleration 1 引言传统沸石是一类由硅氧四面体和铝氧四面体组成的结晶微孔材料 [1] , 随着沸石工业和制备技术的不断发展, 沸石分子筛的化学组成也已经扩展到其他四配位原子, 例如非金属磷和硼, 金属锡、镓和锗, 过渡金属锌、铁和钛等. 不同 TO 4 四面体的连接方式导致了基于不同组成的沸石分子筛骨架类型的多样性. 到目前为止, 国际分子筛协会认定的分子筛拓扑结构已达 255 种. 根据其孔道窗口, 沸石分子筛被分为小孔分子筛(≤8 元环), 中孔分子筛(10 元环), 大孔分子筛(12 元环)及超大孔分子筛(＞12 元环) [2] . 因其规则的孔道结构、独特的择形性、可调节的酸性位点和较高的水热稳定性, 沸石分子筛材料作为非均相催化剂、吸附剂和离子交换剂等在现代化学工业和石油化工领域发挥着极其重要的作用 [3] . 近年来, 随着合成方法和表征技术的不断进步, 许多新型沸石分子筛材料被制备出来, 拓展了分子筛的应用范围, 如生物质转化 [4] 、燃料电池 [5] 、热能储存 [6] 、二氧化碳捕获和转化 [7] 、空气污染修复 [8] 和水的净化 [9] 等.20 世纪 40 年代, Barrer [10]

show abstract

“…In the last few years, many papers have also described successful zeolite formation using sonication treatment. FA was converted to sodalite, Na-P-, A-or X-type zeolite Processes 2024, 12, 486 2 of 15 via an ultrasound process carried out as the only treatment or applied before and after the hydrothermal process [35][36][37][38][39][40], whereas in our previous paper, the formation of a zeolite-layered double-hydroxide composite (LTA-LDH) was documented using red mud treated by sonication [21]. However, although the ultrasonic treatment shows numerous advantages mainly related the low temperature and short time, this method also requires a significant amount of water that becomes a waste product after the synthesis process.…”

Section: Introductionmentioning

confidence: 99%

Determining the Role of Water Molecules in Sodalite Formation Using the Vapor Phase Crystallization Method

Belviso

2024

Processes

View full text Add to dashboard Cite

The efficiency of the vapor phase crystallization (VPC) process in zeolite formation using mixtures of a natural source (obsidian) and common waste materials (red mud and fly ash) was analyzed. The aim was to demonstrate that water molecules available during this treatment control mainly the synthesis of sodalite, regardless of the raw material used, as long as it is rich in amorphous silica and alumina pre-fused with NaOH. The data indicate that increasing the temperature to generate steam from distilled water during the VPC process results in the continuous transformation of amorphous material into sodalite and, subordinately, cancrinite. The formation of the newly formed phases was monitored by powder XRD and SEM.

show abstract

Experimental and numerical investigation of the effect of ultrasound on the growth kinetics of zeolite A

Cited by 11 publications

References 29 publications

The Development of Fe3O4-Monolithic Resorcinol-Formaldehyde Carbon Xerogels Using Ultrasonic-Assisted Synthesis for Arsenic Removal of Drinking Water

The Development of Fe3O4-Monolithic Resorcinol-Formaldehyde Carbon Xerogels Using Ultrasonic-Assisted Synthesis for Arsenic Removal of Drinking Water

Advances in Hydroxyl Free Radical Assisted Synthesis of Zeolite

Determining the Role of Water Molecules in Sodalite Formation Using the Vapor Phase Crystallization Method

Contact Info

Product

Resources

About