Abstract
Wetland saline water has great potential to overcome water scarcity due to high salinity of intruded seawater. This work determines performance of silica membranes using organo catalyst applied for wetland saline water desalination via pervaporation and investigates the effect of calcination temperatures. These membranes were prepared from precursor tetraethyl orthosilicate (TEOS) for 3 h through sol-gel process refluxed at 0°C (membrane A) and 50°C (membrane B). The sols were dipcoated onto alumina (Al2O3) support for 4 layers followed by calcination for 1 h. Performance of membranes were evaluated by feeding wetland saline water through desalination at room temperature. Results show the water flux for membrane A were 0.27 & 0.15 kg.m-2.h-1 and salt rejection were 97.5 & 99 % as a function of calcination temperature (200 & 250°C), respectively. Furthermore, water flux of membranes B were 0.90 & 0.93 kg.m-2.h-1 and excellent salt rejection (>99.9 %) for both calcination temperatures. The highest water flux and salt rejection were found for membranes B. For both using citric acid under refluxed and calcination process, it gives more vibration of Si-C formation and membrane pores. This membrane is the very first and mesoporous organo silica membranes which is successfully fabricated from organo catalyst.
Highlights
Increasing of water scarcity issues when the earth consist of 97.5 % water but only 2.5 % of proper consumption gives the big impact for fulfillment of life’s needs
This work aims to evaluate the performance of organosilica membrane using precursor tetraethyl orthosilicate (TEOS) and citric acid catalyst for wetland saline water desalination via pervaporation and investigate effect of calcination temperature
Organosilica membrane was prepared through sol gel process including hydrolysis and condensation reaction
Summary
Increasing of water scarcity issues when the earth consist of 97.5 % water but only 2.5 % of proper consumption gives the big impact for fulfillment of life’s needs. Indonesia is in high stress level (40-80%) representing the ration of withdrawal to supply of water [1]. The greatest issue of world’s water scarcity has been encountered in Indonesia which is as the world’s largest archipelago. South Kalimantan as the largest island in Indonesia characterized by wetland whereas the height of soil at 0.16 under sea level is important in hydrology and big potential as water reservoir. During rainy season the seawater intrudes into rivers and salty water formed. Wetland saline water as a big source of clean water requires for contaminant removal process
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