Functionalization of Si-C Using TEOS (Tetra Ethyl Ortho Silica) as Precursor and Organic Catalyst

Lestari, Riani Ayu; Elma, Muthia; Rampun, Erdina Lulu Atika; Sumardi, Anna; Paramitha, Adhe; Lestari, Aptar Eka; Rabiah, Sadidan; Assyaifi, Zaini Lambri; Satriaji, Gesit

doi:10.1051/e3sconf/202014807008

Cited by 18 publications

(13 citation statements)

References 22 publications

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“…The mass loss was decreased rapidly by ±10% at temperature 30–120 °C; this could be due to physiosorbed water removal in both one- and two-step catalyst samples. It normally happened because the silica material has a hydrophilic nature and easily absorbs water molecules through hydrogen bond (OH) groups of silanol species [ 34 , 35 ]. Hence, it could be remaining in the carbon-silica matrix, as observed in the IR spectrum in Figure 2 .…”

Section: Resultsmentioning

confidence: 99%

Physicochemical Properties of Mesoporous Organo-Silica Xerogels Fabricated through Organo Catalyst

et al. 2021

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The physicochemical properties of organo-silica xerogels derived from organo catalyst were pervasively investigated, including the effect of one-step catalyst (citric acid) and two-step catalyst (acid-base), and also to observe the effect of sol pH of organo-silica xerogel toward the structure and deconvolution characteristic. The organo-silica xerogels were characterized by FTIR, TGA and nitrogen sorption to obtain the physicochemical properties. The silica sol–gel method was applied to processed materials by employing TEOS (tetraethyl orthosilicate) as the main precursor. The final molar ratio of organo-silica was 1:38:x:y:5 (TEOS:ethanol: citric acid: NH3:H2O) where x is citric acid concentration (0.1–10 × 10−2 M) and y is ammonia concentration (0 to 3 × 10−3 M). FTIR spectra shows that the one-step catalyst xerogel using citric acid was handing over the higher Si-O-Si concentration as well as Si-C bonding than the dual catalyst xerogels with the presence of a base catalyst. The results exhibited that the highest relative area ratio of silanol/siloxane were 0.2972 and 0.1262 for organo catalyst loading at pH 6 and 6.5 of organo-silica sols, respectively. On the other hand, the organo-silica matrices in this work showed high surface area 546 m2 g−1 pH 6.5 (0.07 × 10−2 N citric acid) with pore size ~2.9 nm. It is concluded that the xerogels have mesoporous structures, which are effective for further application to separate NaCl in water desalination.

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Section: Resultsmentioning

confidence: 99%

Physicochemical Properties of Mesoporous Organo-Silica Xerogels Fabricated through Organo Catalyst

et al. 2021

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“…The strong acid catalyst promoted more micropore with an average pore size of less than 2 nm and end-of-chain condensation, while the base catalyst contributed to the mesoporous size (an average pore size in the range 2–50 nm). However, in a recent study, a mesopore can be formed, too, by applying weak acid (citric acid) catalyst [ 44 , 50 ].…”

Section: Resultsmentioning

confidence: 99%

“…Many previous researchers have used the TEOS [ 29 , 44 ], but only a few researchers employed ES40 [ 13 ]. Membrane usually also consists of thin film, -Al 2 O 3 interlayer with pore size of >0.05 m, and substrate of >0.5 m [ 45 ].…”

Section: Introductionmentioning

confidence: 99%

Development of Hybrid and Templated Silica-P123 Membranes for Brackish Water Desalination

et al. 2020

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Water scarcity is still a pressing issue in many regions. The application of membrane technology through water desalination to convert brackish to potable water is a promising technology to solve this issue. This study compared the performance of templated TEOS-P123 and ES40-P123 hybrid membranes for brackish water desalination. The membranes were prepared by the sol–gel method by employing tetraethyl orthosilicate (TEOS) for the carbon-templated silica (soft template) and ethyl silicate (ES40) for the hybrid organo-silica. Both sols were templated by adding 35 wt.% of pluronic triblock copolymer (P123) as the carbon source. The silica-templated sols were dip-coated onto alumina support (four layers) and were calcined by using the RTP (rapid thermal processing) method. The prepared membranes were tested using pervaporation set up at room temperature (~25 °C) using brackish water (0.3 and 1 wt.%) as the feed. It was found that the hybrid membrane exhibited the highest specific surface area (6.72 m2·g−1), pore size (3.67 nm), and pore volume (0.45 cm3·g−1). The hybrid ES40-P123 was twice thicker (2 μm) than TEOS-P123-templated membranes (1 μm). Lastly, the hybrid ES40-P123 displayed highest water flux of 6.2 kg·m−2·h−1. Both membranes showed excellent robustness and salt rejections of >99%.

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“…Silica has good mechanical strength and thermal stability [1]. In order to increase hydro stability and silica matrices endurance for mechanical and chemical strength, it is required a modification process on pure silica matrix by adding and templating carbon silica [26,[32][33][34][35][36][37][38][39][40][41][42]. In addition, embedding carbon molecules into silica matrix lead well hydro stability of silica [43].…”

Section: Introductionmentioning

confidence: 99%

Banana Peels Pectin Templated Silica Ultrafiltration Membrane in Disk Plate Configuration Applied for Wetland Water Treatment

Elma

Ghani

Rahma

et al. 2022

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South Kalimantan has natural surface water such as wetland water which easily found to prevent water scarcity. Two types of wetland water provided in tropical area i.e. (1) peat water which located in land area; and (2) wetland saline water that area is near to coastal zone. Both are unsuitable for consumption and required to be treated. Ultrafiltration (UF) is one of methods that can be applied for treating natural wetland water using silica membrane. However, it needs improved by carbon due to lacking its low hydrostability properties. This works investigated performance of banana pectin templated silica ultrafiltration membrane in varied operation pressure and feed water treatment. Preparation of ultrafiltration membrane was used banana peels pectin as carbon source that templated into silica sol through sol gel process. Silica pectin xerogel was characterized by Fourier Transformed Infra-red (FTIR) and morphology of silica pectin membrane was characterized by Scanning Electron Microscopy (SEM). The sol is carried out by a coating process to the alumina membrane support on 4 layers. The calcination process is using the Conventional Thermal Processing (CTP) method. Furthermore, the ultrafiltration process run on the dead-end ultrafiltration silica pectin membrane has three functional groups, namely siloxane (Si-O-Si) at a wavelength of 1061 cm-1. silanol (Si-OH) at a wavelength of 966 cm-1 and silica carbon (Si-C) at a wavelength of 795 cm-1. The performance of silica pectin membranes at pressures of 0.5 bar, 1 bar and 1.5 bar in peat water resulted in fluxes of 5.07 kg.m-2.h-1, 11.31 kg.m-2.h-1 and 18.90 kg.m-2.h-1 with rejection of organic matter of 85.56%, 85.49% and 84.68%. Meanwhile in wetland saline water it was 7.04 kg.m-2.h-1, 11.73 kg.m-2.h-1 and 20.52 kg.m-2.h-1 with rejection of organic matter of 82.50%, 79.46% and 78.11%. Salt rejection for wetland saline water for 0.5 bar until 1.5 bar is 84.39%, 82.54% and 81.04%. Ultrafiltration It can be concluded that the increase in pressure affects the performance of the silica pectin membrane where the flux value increases with each increase in pressure, but the rejection value of organic matter and salt rejection show a decreasing.

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Functionalization of Si-C Using TEOS (Tetra Ethyl Ortho Silica) as Precursor and Organic Catalyst

Cited by 18 publications

References 22 publications

Physicochemical Properties of Mesoporous Organo-Silica Xerogels Fabricated through Organo Catalyst

Physicochemical Properties of Mesoporous Organo-Silica Xerogels Fabricated through Organo Catalyst

Development of Hybrid and Templated Silica-P123 Membranes for Brackish Water Desalination

Banana Peels Pectin Templated Silica Ultrafiltration Membrane in Disk Plate Configuration Applied for Wetland Water Treatment

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