In situ hydrothermal synthesis of a novel hierarchically porous TS-1/modified-diatomite composite for methylene blue (MB) removal by the synergistic effect of adsorption and photocatalysis

Yuan, Weiwei; Yuan, Peng; Liu, Dong; Yu, Wenbin; Laipan, Minwang; Deng, Liangliang; Chen, Fanrong

doi:10.1016/j.jcis.2015.09.067

Cited by 64 publications

(24 citation statements)

References 61 publications

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“…Hierarchical zeolite composites are commonly prepared using a hydrothermal treatment to grow a zeolite layer onto a porous support [9,[13][14][15][16]; or using a layer by layer approach which involves coating the support with zeolite crystals which have been previously prepared [17][18][19]. In the case of growing zeolite crystals on a porous support, it is important to generate nucleation sites on the porous support before mixing with zeolite gel and crystallization.…”

Section: Introductionmentioning

confidence: 99%

Hierarchically porous zeolite X composites for manganese ion-exchange and solidification: Equilibrium isotherms, kinetic and thermodynamic studies

Al‐Jubouri

Holmes

2017

Chemical Engineering Journal

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This paper deals with the kinetic and isotherm studies of manganese ion removal by zeolite X and its hierarchically porous composites as ion-exchange materials. A hydrothermal treatment was applied to grow a layer of zeolite X over diatomite and carbon surfaces. The hierarchically porous composites used for Mn 2+ ion removal showed higher ion-exchange capacity when compared to pure zeolite X under same conditions. A thermodynamic study of the rate of ion-exchange revealed that the intra-particle diffusion rate constant of zeolite X/carbon and zeolite X/diatomite was higher than that of pure zeolite X indicating that the intra-particle diffusion was enhanced when zeolite was prepared in form of hierarchically porous composites. The study showed that the thickness of boundary film of zeolite X/carbon and zeolite X/diatomite was less than that of pure zeolite X indicating ion diffusion resistance to the active sites was reduced when the composites were utilised. The experimental data showed good agreement with Freundlich model. The calculated thermodynamic parameters such as ΔG°, ΔH° and ΔS° indicated the ion-exchange process of Mn 2+ ion by zeolite X and its composites was spontaneous, endothermic and the randomness increased at the liquid/solid interface under the conditions studied. The results of kinetic study showed that the ion-exchange of Mn 2+ ion by zeolite X and its composites followed a pseudo second order

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Section: Introductionmentioning

confidence: 99%

Hierarchically porous zeolite X composites for manganese ion-exchange and solidification: Equilibrium isotherms, kinetic and thermodynamic studies

Al‐Jubouri

Holmes

2017

Chemical Engineering Journal

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“…This shaping step represents an additional challenge as it necessitates a fine control of the mechanical properties and the diffusion regimes without sacrificing the intrinsic performance of the catalyst. Alternatively, the catalyst can be dispersed onto a pre‐shaped solid support that should meet several specifications (texture, surface composition, mechanical stability, etc.). With such strategy, a challenge is to maximize the loading and the dispersion of the catalyst while avoiding leaching and/or deactivation .…”

Section: Figurementioning

confidence: 99%

Macrocellular Titanosilicate Monoliths as Highly Efficient Structured Olefin Epoxidation Catalysts

et al. 2019

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Self-standing macrocellular titanosilicate monolith foams are obtained using a one-pot sol-gel route and show excellent performance in the epoxidation of cyclohexene. Thanks to the High Internal Phase Emulsion (HIPE) templating method, the materials feature a high void fraction, a hierarchically porous texture and good mechanical strength. Highly dispersed Ti species can be incorporated in tetrahedral coordination in the silica matrix. These characteristics allow the obtained 'SiTi(HIPE)' materials to reach high catalytic turnover in the epoxidation of cyclohexene. The monoliths can advantageously be used to run the reaction in continuous flow mode.Titanosilicates are an important class of materials that catalyze selective oxidation reactions. [1] For example, the combination of TS-1 zeolite -in which Ti atoms substitute Si atoms in the crystalline framework -with H 2 O 2 is omnipresent in industrial applications, notably for hydroxylation and epoxidation reactions. [2,3] The crystallinity and the intrinsic hydrophobicity of TS-1 make this material particularly efficient to catalyze the oxidation of small substrates with high selectivities. [4] However, the microporosity of TS-1 makes it less efficient for the conversion of bulky olefins, as the restricted diffusion of the reactants and products in and out the porosity can severely lower the catalytic activity which is consequently mainly restrained to the external surface. [5,6] An additional limitation is linked to the fact that the Ti loading incorporated into the zeolitic framework can hardly be tuned -with a typical maximal Ti loading of 2.5 % (here and after the loading is expressed as mol Ti/(mol Ti + mol Si) × 100 %). [7] These issues triggered intensive research on the incorporation of titanium in silicabased materials with larger pores in order to broaden the range of applications for titanosilicates. [8][9][10] New strategies in this field are flourishing, taking benefits of bottom-up sol-gel routes [11] involving templating methods -possibly combined to supercritical [12,13] or aerosol [14,15] drying strategies -or realized under non-aqueous conditions. [16][17][18] Despite those successes, the resulting materials are often obtained in the form of fine powders which require further steps to shape the catalysts as extrudates, pellets or monoliths, before they could be used in industrial flow processes. [19] This shaping step represents an additional challenge as it necessitates a fine control of the mechanical properties and the diffusion regimes without sacrificing the intrinsic performance of the catalyst. Alternatively, the catalyst can be dispersed onto a pre-shaped solid support [20][21][22] that should meet several specifications (texture, surface composition, mechanical stability, etc.). With such strategy, a challenge is to maximize the loading and the dispersion of the catalyst while avoiding leaching and/or deactivation. [23] Thus, the one-step preparation of Ti-containing materials that do not require further shaping steps is highly sought f...

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“…Non-toxic, biodegradable and eco-friendly natural polymers such as cellulose, chitosan, and starch are also used because of their natural abundance, high efficiency and low cost 9 . For industrial applications, there is a need for more advanced properties of an adsorbent such as fast adsorption kinetics, high capacity, and temperature stability 10–15 . Polymeric materials can fulfill the industrial requirements by tailoring them with judicious design.…”

Section: Introductionmentioning

confidence: 99%

Tailoring hydrophobic branch in polyzwitterionic resin for simultaneous capturing of Hg(II) and methylene blue with response surface optimization

Saleh

Rachman

Ali

2017

Sci Rep

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A new highly efficient cross-linked polymer was synthesized via cyclotetrapolymerization of hydrophilic [(diallylamino)propyl]phosphonic acid hydrochloride (72 mol%), hydrophobic N,N-diallyl-1-[6-(biphenyl-4-yloxy)hexylammonium chloride (18 mol%), cross-linker 1,1,4,4-tetraallylpiperazinium dichloride (10 mol%) with an equivalent amount of alternating SO2 units (100 mol%). The pH-responsive resin chemically tailored with the aminopropylphosphonate chelating ligand and hydrophobic chain of (CH2)6OC6H4-C6H5 is designed to capture toxic metal ions and organic contaminants simultaneously. The developed resin was used for the remediation of Hg(II) ions and methylene blue from aqueous solutions as models. The experimental conditions were optimized utilizing the response surface methodology as an environmentally friendly method. The adsorption efficiency for Hg(II) was ≈100% at 10 ppm initial concentration at pH 5 at 25 °C, while it was 80% for removal of the dye in a single pollutant system. Interestingly, the resin demonstrated its remarkable efficacy in the simultaneous and complete removal of Hg(II) and the dye from their mixture. Increased removal of the dye (≈100%) in the presence of Hg(II) was attributed to the synergistic effect. The equilibrium data were evaluated by employing the Langmuir and Freundlich isotherm models.

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In situ hydrothermal synthesis of a novel hierarchically porous TS-1/modified-diatomite composite for methylene blue (MB) removal by the synergistic effect of adsorption and photocatalysis

Cited by 64 publications

References 61 publications

Hierarchically porous zeolite X composites for manganese ion-exchange and solidification: Equilibrium isotherms, kinetic and thermodynamic studies

Hierarchically porous zeolite X composites for manganese ion-exchange and solidification: Equilibrium isotherms, kinetic and thermodynamic studies

Macrocellular Titanosilicate Monoliths as Highly Efficient Structured Olefin Epoxidation Catalysts

Tailoring hydrophobic branch in polyzwitterionic resin for simultaneous capturing of Hg(II) and methylene blue with response surface optimization

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