Adsorption characteristics of Na-A zeolites synthesized from Egyptian kaolinite for manganese in aqueous solutions: Response surface modeling and optimization

Zayed, Ahmed M.; Selim, Ali Q.; Mohamed, Essam A.; Wahed, Mahmoud S. M. Abdel; Seliem, Moaaz K.; Sillanpää, Mika

doi:10.1016/j.clay.2017.01.027

Cited by 51 publications

(19 citation statements)

References 29 publications

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“…5b). The obtained multi-linear plot plus the 7.97 mg/g value of the C constant confirmed that MB removal by the TGSH was not mainly described by intra-particle diffusion, but various diffusion sorts may be involved [3,28,61,80,81]. The C constant value measures the degree of surface sorption participation in the rate-controlling step of MB adsorption [19,51].…”

Section: (A)supporting

confidence: 60%

Talc-graphite schist as a natural organo-mineral complex for methylene blue remediation: kinetic and isotherm study

et al. 2020

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Talc-graphite schist (TGSH) is a natural organo-mineral complex that was derived from the regional metamorphism of organic matter-bearing calcareous clays under the lowest temperature and pressure of the green schist facies (573-632 K and 1-3 Kbars, respectively). The application of TGSH that is widely available in the Meatiq area (Eastern Desert, Egypt) was investigated for the first time ever in the remediation of methylene blue dye (MB) from aqueous solutions. The characterization of the TGSH was carried out using various techniques (XRF, XRD, SEM, FT-IR and BET surface area), and its MB removal capacity was estimated at different experimental conditions. The MB adsorption by TGSH was time-and pH-dependent process, where 120 min was sufficient enough to attain equilibrium. The MB adsorption capacity by the TGSH was directly proportional to the applied temperature, confirming that the MB adsorption process was endothermic in behavior. Based on the determination coefficients, the pseudo-second-order equation (R 2 = 0.939) explained MB adsorption data better than the first-order one (R 2 = 0.653). Meanwhile, intra-particle diffusion was not the sole controlling rate in MB removal by the TGSH. Moreover, the nonlinear regressions of Langmuir model (R 2 = 0.876) explained the equilibrium data better than the other applied models (Temkin, R 2 = 0.793, and Freundlich, R 2 = 0.752). On the other hand, the estimated q max (maximum removal capacity) of Langmuir was 9.41 mg/g at ambient temperature. Hydrogen bonding and electrostatic interaction were the governing mechanisms of MB removal by TGSH with variable impact in accordance with the prevailing pH condition.

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Section: (A)supporting

confidence: 60%

Talc-graphite schist as a natural organo-mineral complex for methylene blue remediation: kinetic and isotherm study

et al. 2020

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“…18,19) and all samples at 130 • C (Nos. [21][22][23][24][25]. Analysis of the five figures showed that crystallization temperature was the key factor for the synthesis of 4A zeolite.…”

Section: Orthogonal Tests Results Analysismentioning

confidence: 99%

Synthesis of 4A Zeolite from Kaolinite-Type Pyrite Flotation Tailings (KPFT)

2018

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As a solid waste, kaolinite-type pyrite flotation tailings (KPFT) are a type of low-quality kaolin that contain impurities, such as iron and titanium. In this study, KPFT were calcined at 800 °C for two hours. The calcined production (CKPFT), which is mainly metakaolin, was used as the silicon and aluminum source to synthesize 4A zeolite (Na12[(AlO2)12(SiO2)12]·27H2O) via hydrothermal synthesis. The optimal hydrothermal synthesis conditions were determined from X-ray diffraction phase analysis, relative crystallinity (RC), and cation ion exchange capacity (CEC). The optimal hydrothermal synthesis conditions were determined to be a ratio of 5 g CKPFT, 6.5 g NaOH, 65 mL H2O, crystallization temperature 110 °C, and crystallization time of three hours. Under the optimal hydrothermal synthesis conditions, the RC and CEC of the synthesized 4A zeolite were 40.77% and 210.32 mg CaCO3·g−1, respectively. Further characterizations including pore size distribution, scanning electron microscopy, energy dispersive X-ray, thermogravimetry-differential scanning calorimetry, and Fourier transform infrared spectroscopy were performed. The results revealed that impurities in KPFT do not affect the synthesis of 4A zeolite. The surface morphology of the synthesized 4A zeolite was composed of chamfered-edged cubes with a particle size of one to three μm that was thermally stable up to approximately 890 °C.

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“…These minerals are characterized by a notably uniform pore structure with a molecular dimension <0.13 nm formed between tetrahedrally coordinated Si 4+ and Al 3+ that are connected via oxygen atoms [15]. Due to the limited availability of pure natural zeolites, researchers have turned towards synthetic zeolites for adsorbent purposes [16][17][18]. Zeolites are most commonly synthesized by hydrothermal alkali-activation of aluminosilicate materials at appropriate temperatures (100-1000 • C) and pressures (1~100 MPa) in high-pressure autoclaves [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Hydroxy-Sodalite/Cancrinite Zeolites from Calcite-Bearing Kaolin for the Removal of Heavy Metal Ions in Aqueous Media

et al. 2019

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A hydroxy-sodalite/cancrinite zeolite composite was synthesized from low-grade calcite-bearing kaolin by hydrothermal alkali-activation method at 160 • C for 6 h. The effect of calcite addition on the formation of the hydroxy-sodalite/cancrinite composite was investigated using artificial mixtures. The chemical composition and crystal morphology of the synthesized zeolite composite were characterized by X-ray powder diffraction, infrared spectroscopy, scanning electron microscopy, and N 2 adsorption/desorption analyses. The average specific surface area is around 17-20 m 2 ·g −1 , whereas the average pore size lies in the mesoporous range (19-21 nm). The synthesized zeolite composite was used as an adsorbent for the removal of heavy metals in aqueous solutions. Batch experiments were employed to study the influence of adsorbent dosage on heavy metal removal efficiency. Results demonstrate the effective removal of significant quantities of Cu, Pb, Ni, and Zn from aqueous media. A comparative study of synthesized hydroxy-sodalite and hydroxy-sodalite/cancrinite composites revealed the latter was 16-24% more efficient at removing heavy metals from water. The order of metal uptake efficiency for these zeolites was determined to be Pb > Cu > Zn > Ni. These results indicate that zeolite composites synthesized from natural calcite-bearing kaolin materials could represent effective and low-cost adsorbents for heavy metal removal using water treatment devices in regions of water shortage.

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Adsorption characteristics of Na-A zeolites synthesized from Egyptian kaolinite for manganese in aqueous solutions: Response surface modeling and optimization

Cited by 51 publications

References 29 publications

Talc-graphite schist as a natural organo-mineral complex for methylene blue remediation: kinetic and isotherm study

Talc-graphite schist as a natural organo-mineral complex for methylene blue remediation: kinetic and isotherm study

Synthesis of 4A Zeolite from Kaolinite-Type Pyrite Flotation Tailings (KPFT)

Synthesis of Hydroxy-Sodalite/Cancrinite Zeolites from Calcite-Bearing Kaolin for the Removal of Heavy Metal Ions in Aqueous Media

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