Synthesis and characterization of ZSM-5 zeolite from rice husk ash and their adsorption of Pb2+ onto unmodified and surfactant-modified zeolite

Othman, I.; Hassan, Ali M.; Shaaban, S. M.; Soliman, Karam Seifelnasser

doi:10.1016/j.seppur.2011.08.034

Cited by 94 publications

(9 citation statements)

References 41 publications

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“…The amorphous silica from RH may have its chemical purity and particle size modified by the thermal treatment temperature [8]. The rice husk ash (RHA) obtained from RH can be contains > 99% (w/w) silica and some amount of impurities [1,9,10], however, in order to obtain such a high silica content, the RH should be subjected to a water washing process in order to remove unwanted materials and then be pretreated with an acidic or basic solution, in order to remove impurities [1].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of rice husk ash in adsorption of Remazol Red dye from aqueous media

Costa

Paranhos

2019

SN Appl. Sci.

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The rice husk ash (RHA) extracted from the rice husk (RH) was measured on the removal of the Remazol Red dye. Adsorption variables such as solution pH, dye concentration, adsorbent amount, contact time, and reuse of the RHA were measured. The adsorption equilibrium was achieving in approximately 30 min, due to the rapid electrostatic attraction between the OH 2 + groups of the RHA surface and the sulfonic groups of the dye, which occurred mainly at a pH = 2 value. The removal efficiency of the RHA decreased when the initial dye concentrations were higher, due to pore-filling within of the RHA structure with the migration dye molecules. However, the removal percentage increased with increasing adsorbent amount. The adsorption data were suitable with the Freundlich isotherm and pseudo-second order models.

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Section: Introductionmentioning

confidence: 99%

Evaluation of rice husk ash in adsorption of Remazol Red dye from aqueous media

Costa

Paranhos

2019

SN Appl. Sci.

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“…Besides the high specific surface area, its porous structure can adsorb high amount of heavy metal. Generally, heavy metal cations are adsorbed on the surface of zeolite by ion exchange mechanism, as the silica-alumina oxygen units of zeolite caused a negative charge on the surface of zeolite [29–32].…”

Section: Introductionmentioning

confidence: 99%

Effect of chemical additives on electrokinetic remediation of Cr-contaminated soil coupled with a permeable reactive barrier

Muhammad

Yan

et al. 2019

R. Soc. open sci.

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Chromium (Cr) contamination in soil, especially Cr(VI), is a serious threat to the environment and human health. The electrokinetic remediation (EKR) is a promising technology to remediate the Cr(VI). Therefore, in this study, EKR coupled with a permeable reactive barrier (PRB) was used to treat the Cr(VI)-contaminated soil. The CTMAB-Z, a modified zeolite (prepared with cetyltrimethyl ammonium bromide) alone and a mixture of CTMAB-Z and Fe(0) were used as PRB-1 and PRB-2 reactive media, respectively. The effect of chemical enhancers/additives, i.e. DL-tartaric acid and Tween 80 on EKR of Cr(VI) was also analysed in the contrasting experiments. While the effects of repair time, voltage gradient and DL-tartaric acid concentration on Cr(VI) remediation were investigated by using the multifactor orthogonal experiment which was based on contrasting experiments. The contrasting experiment results showed that the highest Cr(VI) removal rate (66.27%) and leaching efficiency (71.29%) were observed in the experimental group which had DL-tartaric acid and PRB-2. Furthermore, the multifactor orthogonal experiment results had depicted that the highest Cr(VI) removal rate (80.92%) and leaching efficiency (85.25%) were achieved after treating the samples at a voltage gradient of 2.5 V cm −1 for 8 days in the presence of 0.15 M concentration of DL-tartaric acid. This study demonstrated that Cr(VI) remediation through EKR process could be significantly enhanced by the use of PRB and additives.

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“…Naturally occurring silicas found in agricultural waste are a good substitute for commercial silica precursors. Thus, raw materials from agricultural waste, such as corncob-stalk-and-leaves ash [ 12 ], rice husk ash [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ], sugar cane bagasse ash [ 25 , 26 ], barley ash [ 27 ], coal ashes [ 28 , 29 , 30 , 31 , 32 , 33 , 34 ], clay minerals [ 35 , 36 , 37 , 38 , 39 , 40 ], industrial slags [ 41 ], natural zeolites [ 42 ], and solid waste incineration ashes [ 43 , 44 , 45 ], are used as alternative and cheap source materials for the synthesis of zeolite. The use of agricultural waste materials, such as those in the field of water purification and in the removal of ammonium or heavy metals, makes them appealing as useful products that contribute to the mitigation of environmental problems.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis and Characterization of Zeolite A from Corn (Zea Mays) Stover Ash

et al. 2021

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This study deals with the impact of calcination, alkalinity, and curing time parameters on the hydrothermal synthesis of zeolite A. The zeolite A sample, produced from corncob-stalk-and-leaves (corn stover) ash was characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermo-gravimetric analysis (TGA), and scanning electron microscopy (SEM). The results showed that calcination, alkalinity, and curing time have significant effects on the crystallization and the morphology of zeolite A. In addition, these parameters also impacted the cation exchange capacity. Furthermore, the synthesized zeolite A was obtained using a calcination temperature of 5000 °C within two hours of airflow, which is much lower than the temperatures previously reported in the literature for an agricultural waste and other waste materials. A fusion ratio of corn stover ash:NaOH of 1.0:1.5 and a curing time of nine hours were achieved. This is a major result as this curing time is much lower than those featured in other studies, which can reach up to twenty-four hours. In this paper, cubic crystal with rounded edge of zeolite A, having a cation exchange capacity of 2.439 meq Na+/g of synthesized anhydrous zeolite A, was obtained, which can be a good candidate for ion-exchange separation.

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Synthesis and characterization of ZSM-5 zeolite from rice husk ash and their adsorption of Pb2+ onto unmodified and surfactant-modified zeolite

Cited by 94 publications

References 41 publications

Evaluation of rice husk ash in adsorption of Remazol Red dye from aqueous media

Evaluation of rice husk ash in adsorption of Remazol Red dye from aqueous media

Effect of chemical additives on electrokinetic remediation of Cr-contaminated soil coupled with a permeable reactive barrier

Hydrothermal Synthesis and Characterization of Zeolite A from Corn (Zea Mays) Stover Ash

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