Functionalization of hybrid organosilica based membranes for water desalination – Preparation using Ethyl Silicate 40 and P123 Sazila Karina Rahman a,b , Maimunawaro a,b , Aulia Rahma a,b , Isna Syauqiah a , Muthia Elma a,b,⇑ a Chemical Engineering Department, Lambung Mangkurat University, Jl. A. Yani KM 36, Banjarbaru, South Kalimantan 70714, Indonesia b Materials and Membranes Research Group (M 2 ReG), Lambung Mangkurat University, Jl. A. Yani KM 36, Banjarbaru, South Kalimantan 70714, Indonesia article info Article history: Received 17 September 2019 Received in revised form 7 January 2020 Accepted 8 January 2020 Available online xxxx Keywords: Water desalination ES40 Hybrid organosilica Xerogels P123 abstract Hybrid organosilica are recency type of membranes derived from Ethyl Silicate 40 (ES40) and pluronic triblock copolymer (P123) precursors. These materials were employed to improve the hydrostability of pure silica matrices becomes stronger especially when applied for water desalination. This work shows for the first time the functionalization of hybrid ES40-P123 materials which prepare for organosilica membranes fabrication. The aim of this work is to investigate the vibration of siloxane (Si-O-Si), silanol (Si-OH) and silica-carbon (Si-C) groups of hybrid organosilica (ES40-P123) xerogels measured by Fourier Transform Infra-Red (FTIR) and fityk software. Silica sols are produced by combining ES40 and P123 materials using sol-gel method through hydrolysis and condensation reactions with acid-base catalysts. P123 was added together with base catalyst in sol mixtures to form hybrid silica P123 structures. This process was held at 50 °C for 3 h of reflux. The final molar ratios of hybrid organosilica (ES40-P123) of the ES40:ethanol:nitric acid:H 2 O:ammonia:P123 were calculated to be 1:120:0.0022:16:0.009:0.1, respectively. From the FTIR measurement, the functionalization of organosilica (ES40-P123) xerogels was detected as siloxane (Si-O-Si) groups at the wavelength 1067 and 1220 cm À1 . Silanol (Si-OH) groups at 958 cm À1 . Then, silica-carbon (Si-C) group was detected at wavelength 801 cm À1 . The presence of silica-carbon indicates the organosilica structure become enhanced and more stable toward water. Ó 2020 Elsevier Ltd. All rights reserved. Selection and Peer-review under responsibility of the scientific committee of the 4th International Con- ference on Green Chemical Engineering and Technology: Materials Science. 1. Introduction The development of functionalization of silica materials has become an important requirement in recent years. Lately, many studies often get attracted most commonly in silica material for membrane fabrication. The silica membranes give a good perfor- mance [1,2], thermal stability [3] and good molecular sieving prop- erties. The process of functionalization of this silica material becomes the basic knowledge to understand the silica materials to be applied for water desalination application. However silica has hydrophilic reacts when in contact with water so that can resulting poor performance on desalination application [4]. Some studies have been reported to improve silica material performance for water treatment including carbon content [4,5], hybrid organic- inorganic [6] and metal oxide on silica matrices [7]. Recently, Wang, Wang [8] using interlayer-free ES40 derived silica membranes fabricated for seawater desalination by Rapid thermal treatment (RTP). Whereas other researches using Tetra- ethyl orthosilicate (TEOS) as conventional silica precursor mem- branes to fabricate silica membrane for desalination application. ES40 precursor has a very few studies in literature compared to the extensively studied TEOS precursor especially in the sol-gel process. ES40 as a partially-condensed silica precursor from TEOS can form a strong silica structure which more resistant to thermal stress and expansion. There is a need fundamentally to understand the sol-gel process and functional evolution of the siloxane (Si-O- Si), silanol (Si-OH) and silica-carbon (Si-C) groups from ES40 pre- cursor. The degree of sol-gel evolution was evaluated by the area ratios of silanol versus siloxane and silanol versus silica-carbon groups calculated from FTIR spectra. These studies will form the https://doi.org/10.1016/j.matpr.2020.01.187 2214-7853/Ó 2020 Elsevier Ltd. All rights reserved. Selection and Peer-review under responsibility of the scientific committee of the 4th International Conference on Green Chemical Engineering and Technology: Materials Science. ⇑ Corresponding author at: Chemical Engineering Department, Lambung Mangkurat University, Jl. A. Yani KM 36, Banjarbaru, South Kalimantan 70714, Indonesia. E-mail address: melma@ulm.ac.id (M. Elma). Materials Today: Proceedings xxx (xxxx) xxx Contents lists available at ScienceDirect Materials Today: Proceedings journal homepage: www.elsevier.com/locate/matpr Please cite this article as: S. K. Rahman, Maimunawaro, A. Rahma et al., Functionalization of hybrid organosilica based membranes for water desalination – Preparation using Ethyl Silicate 40 and P123, Materials Today: Proceedings, https://doi.org/10.1016/j.matpr.2020.01.187