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
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