Silica gel modified with a novel sulfur-containing organic ligand (2-(benzo[d]thiazol-2-yl)-3,3-dimercapto acrylonitrile) for enhance Hg and Pb removal

Pranudta, Antika; El-Moselhy, Medhat Mohamed; Kamal, S. M.; Chanlek, Narong; Nguyễn, Trung Thành; Padungthon, Surapol

doi:10.1016/j.ceja.2021.100110

Cited by 11 publications

(3 citation statements)

References 34 publications

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“…x 1000 (1) where: W1: weight of empty crucible (g), W2: crucible + sample before adsorption (g), W3: crucible + sample after adsorption (g), BM NH3: 17 mol/g Characterization. Characterization by Fourier Transform Infrared (FTIR) spectroscopy was performed using Shimadzu Prestige-21 (Japan).…”

Section: Methodsmentioning

confidence: 99%

“…Due to its porous nature and liking to water molecules, silica gel is used as a drying agent/moisture absorber in packaging or as catalyst support. Silica gel has excellent stable properties, and its surface can be easily modified and contains an active site [1]. The calcination process involved in its production prompts the formation of spherical pores with various pore size distributions that promotes its catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

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Sulfuric Acid-Activated Silica Gel as a Potential Solid Acid Catalyst

Wangsa

Pratika

Ningrum

et al. 2022

KEM

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The conversion of silica gels into sulfated silicas (SO4/SiO2) have been carried out. The sulfation process of the catalysts was carried out by impregnation of sulfuric acids at concentrations of 1; 2; and 3 M and calcination temperatures of 500, 600, and 700 °C. Sulfation with 2 M H2SO4 and calcination temperature of 600 °C (SS2-600) produced a catalyst with the highest acidity value (5.13 mmol NH3 g-1). XRD analysis showed the formation of amorphous SiO2 phase, whereas SSA analysis showed that the SS2-600 catalyst had a mesoporous structure with a surface area of 147.728 m2/g, a total pore volume of 0.25 mL/g and a pore diameter of 6.439 nm. Characterization results show that sulfated silica gels have potency as solid acid catalysts.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sulfuric Acid-Activated Silica Gel as a Potential Solid Acid Catalyst

Wangsa

Pratika

Ningrum

et al. 2022

KEM

View full text Add to dashboard Cite

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“…Among them, the use of xerogels is quite significant for preparing dense ceramics. The high surface area and porosity of xerogel have led to its potential application in filler for chromatographic columns, ultra-filters, and catalytic substrates [4,7], removal of heavy metals [8] as well as the elimination of organic contaminants from waste waters [9].…”

Section: Introductionmentioning

confidence: 99%

Characteristic investigations on bio-silica gel prepared from teff (Eragrostis tef) straw: effect of calcination time

Tessema,

Gonfa,

Hailegiorgis

et al. 2023

Mater. Res. Express

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Bio-based silica gel is having many commercial significances in various sectors, such as medical, cleansing agents in industries, laboratory analysis, cosmetics, food additives, and so forth. In view of crucial requirements, this study aimed to synthesize and characterize the silica gel from Ethiopia’s primary post-harvest biomass residue, known as teff straw. The present study has been emphasized to investigate on the influence of calcination time for teff straw ash [Joshi et al 2022 Investigation of bamboo leaves as an alternative source of silica: extraction, characterization and its application as an adsorbent for methylene blue sequestration Chem. Select. 7, e202200011] preparation between 2 to 5 h. Further, the specific surface area of the resultant TSA samples was examined for preliminary understandings of processing time. By adopting the standard procedures through template-mediated sol–gel process, acquired TSA samples were subjected to treatment with NaOH to result sodium silicate solution and the amorphous silica. From the findings, it was apparent that the yield of silica gel has significantly influenced by calcination time. Accordingly, the maximum yield (90.0%) was attained at the calcination time of 4 h at 900 °C. Further, physiochemical and morphological characteristics of acquired silica gels were ascertained using sophisticated instrumental techniques such as BET, FTIR, XRD, SEM, and EDX. The XRD analysis of the crystallographic characteristics showed that the silica extracted from TSA at 900 °C for 2, 3, 4, and 5 h was found to be in amorphous state. The surface morphological studies of silica gel samples have been carried out using SEM studied. the EDX spectra showed the negligible amount of other impurities, nevertheless a larger amount of silica was found with highest purity of 99.77% e silica gel was obtained in TSA calcinated at 3 h. FTIR spectrum confirmed the presence of siloxane (Si–O–Si) vibrations of amorphous silica that are responsible for the strong bend observed at 1070 cm−1. It was found that the silica gel prepared at 3 h of calcination time had the largest specific surface area of 739.242 m2 g−1, pore volume of 0.32 cm3 g−1, and a pore diameter of 1.68 nm.

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