Facile synthesis of hierarchical structure of NaY zeolite using silica from cogon grass for acid blue 185 removal from water

Kulawong, Sittichai; Chanlek, Narong; Osakoo, Nattawut

doi:10.1016/j.jece.2020.104114

Cited by 20 publications

(12 citation statements)

References 53 publications

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“…Although the macropore structure is beneficial to penetration of larger molecules, but some of internal surface area may be blocked and decrease the dye-adsorbent interaction. The optimum adsorption performance is obtained when the adsorbents consist of micro, meso and macro as reported elsewhere [38,39]. This result is in line with this study where ZSM-5 deSil-deAl showed best performance.…”

Section: Effect Of Adsorbent Typesupporting

confidence: 92%

Enhanced Removal of Soluble and Insoluble Dyes over Hierarchical Zeolites: Effect of Synthesis Condition

et al. 2020

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A hierarchical zeolite ZSM-5 with micro and meso-pore was prepared by optimising the most affecting parameter in sequence of desilication and dealumination. The physicochemical properties of zeolite were characterised with XRD, nitrogen adsorption–desorption, FTIR and SEM. The potential of this zeolite for decolorisation of CR, RY, MB, RhB, DB-1 and DB-14 was evaluated with adsorption isotherm, thermodynamics, kinetics, and influencing parameter for adsorption. The unique modification of ZSM-5 resulted in lower crystallinity, easier porosity control, rich terminal silanol and unbridged silanol groups which assisted in higher adsorption capacity. The adsorption capacity of the optimum ZSM-5 was 323, 435, 589, 625, 61 and 244 mg/g for CR, RY, MB, RhB, DB-1 and DB-14, respectively. The dye adsorption progressed through pseudo-first-order kinetic and close to the Langmuir model. The adsorption mechanism is proposed mainly through interaction between deprotonated silanol site and the electron-rich dye site.

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Section: Effect Of Adsorbent Typesupporting

confidence: 92%

Enhanced Removal of Soluble and Insoluble Dyes over Hierarchical Zeolites: Effect of Synthesis Condition

et al. 2020

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“…In contrast, the untreated sample gave a broad peak at 22 • and other peaks at 29 • , 38.5 • , 43.59 • and 48.17 • corresponding to a mixed phase between the amorphous silica and CaCO 3 phases [26]. The result agrees with previous reports that amorphous silica is found as a major phase in calcined cogon grass treated with acid [23,24]. Moreover, the purity of silica in the treatment with the acid sample was 99.22 ± 0.13, but the purity when not treated with acid was around 69.56 ± 0.33.…”

Section: Phase Of Silica From Cogon Grasssupporting

confidence: 91%

“…Alternatively, silica from renewable sources becomes more attractive due to greener and more environmentally friendly sources. Cogon grass, a weed that is plentifully available in Thailand and tropical countries, is one of the most interesting renewable bio-silica sources [23], since it interrupts the growth of economic crops and has low commercial value [23,24]. Consequently, the traditional method to eliminate cogon grass is burning it into the environment, a simple and cheap management method.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the use of cogon grass as a silica source in zeolite synthesis would be more desirable to produce renewable silica and recycle the waste, lowering the impact on the environment [23]. Concurrently, it is reported as a potential silica source for the synthesis of NaY zeolite because it has a high purity of active silica after extraction and calcination [23,24]. To the best of our knowledge, there is no report on the synthesis of NaX zeolite from cogon grass silica.…”

Section: Introductionmentioning

confidence: 99%

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Magnesium Impregnated on NaX Zeolite Synthesized from Cogon Grass Silica for Fast Production of Fructose via Microwave-Assisted Catalytic Glucose Isomerization

et al. 2021

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Fructose is a crucial intermediate in the production of several chemical platforms. Fructose is mainly produced from glucose isomerization either through immobilized enzymes or heterogeneous catalysts using a conventional heating source, and this is time-consuming. Thus, this work discloses a fast production of fructose via microwave-assisted catalytic glucose isomerization using Mg catalysts supported on NaX zeolite from cogon grass silica. The catalysts were prepared by the impregnation of magnesium nitrate solution and subsequently transformed into MgO on NaX by calcination. The effect of 3, 6 and 9 wt.% Mg content on NaX on the performance of glucose isomerized to fructose was tested at 90 °C for 15 min. The best catalyst was selected for studying the effect of reaction times of 5, 15, 30 and 60 min. Results from X-ray diffraction (XRD), N2 sorption and CO2 temperature-programmed desorption (CO2-TPD) suggested that crystallinity, surface area and micropore volume decrease but basicity increases with Mg content. The X-ray photoelectron spectroscopy (XPS) result confirmed the presence of mixed phases of MgO and Mg2CO3 in all catalysts. The glucose conversion enhanced with the Mg loading but the fructose yield gave the highest value with Mg of 6 wt.%, probably due to the tuning of high active sites and surface area. The greatest fructose selectivity and yield (71.9% and 25.8%) were obtained within 15 min by microwave-assisted catalytic reaction, shorter than the reported value in the literature, indicating a suitable reaction time. Mg (6 wt.%)/NaX catalyst preserves the original catalytic performance up to three cycles, indicating that it is a promising catalyst for fructose production.

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“…Figure 6 compares the FTIR spectra of MH90 and MH90A150 and the interpretations are summarized in Table 2. The spectra of MH90 and MH90A150 correspond to the functional groups of zeolite NaY [32][33][34] and NaP [34][35][36][37], consistent with the XRD results. Figure 7 exhibits the SEM images of MH90 and MH90A150.…”

Section: Comparison Of Conventional and Microwave-assisted Hydrothermsupporting

confidence: 81%

Synthesis of Pure Phase NaP2 Zeolite from the Gel of NaY by Conventional and Microwave-Assisted Hydrothermal Methods

et al. 2020

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The gel of zeolite NaY has potential as a precursor of other zeolites. The particular interest in this work is to convert the gel of NaY to NaP2. We found that the pure phase NaP2 can be produced simply by the conventional hydrothermal (CH) method at 150 °C for 24 h. This NaP2 sample, named CH150, has an average particle size of 10.3 µm and an Si/Al ratio of 1.82. In the case of single crystallization via microwave-assisted hydrothermal (MH) method, various parameters were studied, including the crystallization temperature (90, 150, 175 °C) and time (15, 30, 45, 60 min). The samples were analyzed by X-ray diffraction and scanning electron microscopy. However, mixed phases of P1 and P2 or ANA were obtained from all samples. Another attempt was made by a double crystallization via MH method as followed: at 90 °C for 1 h, quickly cooled down to room temperature in the microwave chamber and aged for 23 h, and finally at 150 °C for 1 h. The sample, named MH90A150, has an average crystal size of 16.45 µm and an Si/Al ratio of 1.85. The high Al content of NaP2 in both samples (CH150 and MH90A150) could lead to interesting applications.

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Facile synthesis of hierarchical structure of NaY zeolite using silica from cogon grass for acid blue 185 removal from water

Cited by 20 publications

References 53 publications

Enhanced Removal of Soluble and Insoluble Dyes over Hierarchical Zeolites: Effect of Synthesis Condition

Enhanced Removal of Soluble and Insoluble Dyes over Hierarchical Zeolites: Effect of Synthesis Condition

Magnesium Impregnated on NaX Zeolite Synthesized from Cogon Grass Silica for Fast Production of Fructose via Microwave-Assisted Catalytic Glucose Isomerization

Synthesis of Pure Phase NaP2 Zeolite from the Gel of NaY by Conventional and Microwave-Assisted Hydrothermal Methods

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