Malaysian Journal of Analytical Sciences Vol 22 No 4 (2018): 605 - 611

DOI: 10.17576/mjas-2018-2204-05

 

 

 

TETRABUTYLPHOSPHONIUM TRIFLUOROACETATE ([P4444]CF3COO) THERMORESPONSIVE IONIC LIQUID AS A DRAW SOLUTION FOR FORWARD OSMOSIS PROCESS

 

(Larutan Ionik Responsif Haba Tetrabutilfosfonium Trifluoroasetat ([P4444]CF3COO) sebagai Larutan Penarik untuk Proses Osmosis Kehadapan)

 

Phang Sook Nyan, Syed Mohd Saufi*, Syamsul Bahari Abdullah, Mazrul Nizam Abu Seman, Malyanah Mohd Taib

 

Faculty of Chemical & Natural Resources Engineering,

Universiti Malaysia Pahang, Lebuhraya Tun Razak, 26300 Gambang, Pahang, Malaysia

 

*Corresponding author:  smsaufi@ump.edu.my

 

 

Received: 16 April 2017; Accepted: 7 March 2018

 

 

Abstract

Forward osmosis (FO) is recognized as a potential membrane technology that utilizes low energy for water desalination. It is driven by natural osmotic pressure difference between feed solution and draw solution across semipermeable membrane. Pure water will permeate from the salinity feed water to the draw solution side. In order to produce pure water, it is necessary to find the best draw solute that exhibits high draw ability and can separate the permeated water efficiently from the draw solution. In the current study, lower critical solution temperature (LCST) thermoresponsive ionic liquid (IL) of tetrabutylphosphonium trifluoroacetate ([P4444]CF3COO) was synthesized as the draw solute for FO process. ([P4444]CF3COO) is dissolved in water below its critical temperature of 29°C and becomes two layered above this critical temperature. [P4444]CF3COO IL showed high water flux of 0.44 ± 0.007 LMH compared to the water flux of 0.32 ± 0.049 LMH for the NaCl draw solute at the same draw solution concentration. Applying thermoresponsive IL as the draw solute in FO process has the potential to treat high salinity of feed stream with ease of water recovery and draw solute regeneration.

 

Keywords:  forward osmosis, draw solution, thermoresponsive ionic liquid

 

Abstrak

Osmosis kehadapan (FO) diiktiraf sebagai teknologi membran berpotensi yang menggunakan tenaga yang rendah untuk penyahgaraman air. Ia didorong oleh perbezaan tekanan osmosis semula jadi antara larutan suapan dan larutan penarik merentasi membran separa telap. Air tulen akan meresap daripada air suapan ke bahagian larutan penarik. Dalam usaha untuk menghasilkan air tulen, ia adalah perlu untuk mencari bahan penarik terbaik yang mempamerkan keupayaan tarikan yang tinggi dan boleh memisahkan air yang telah meresap daripada larutan penarik dengan cekap. Dalam kajian semasa, suhu larutan kritikal rendah (LCST) larutan ionik (IL) responsif haba tetrabutilfosfonium trifluoroasetat ([P4444] CF3COO) telah disintesis sebagai bahan penarik untuk proses FO. [P4444] CF3COO) dilarutkan dalam air di bawahnya suhu kritikal 29 °C dan menjadi dua lapisan di atas suhu kritikal ini. [P4444] CF3COO IL menunjukkan fluks air yang tinggi iaitu 0.44 ± 0.007 LMH berbanding fluks air 0.32 ± 0.049 LMH untuk bahan penarik NaCl pada kepekatan bahan penarik yang sama. Penggunaan larutan ionik responsif haba sebagai bahan penarik dalam proses FO mempunyai potensi untuk merawat air masin yang tinggi dengan lebih mudah untuk pemulihan semula air dan penjanaan semula bahan penarik.

 

Kata kunci:  osmosis kehadapan, larutan penarik, larutan ionik responsif haba

 

References

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