Forward osmosis with direct contact membrane distillation using tetrabutylphosphonium p-toluenesulfonate as an effective and safe thermo-recyclable osmotic agent for seawater desalination

被引：20

作者：

Zeweldi, Hana G. ^{[1
]}

Bendoy, Anelyn P. ^{[1
]}

Park, Myoung Jun ^{[3
]}

Shon, Ho Kyong ^{[3
]}

Johnson, Eldin M. ^{[4
,5
]}

Kim, Han-Seung ^{[2
]}

Kim, Hern ^{[1
]}

Chung, Wook-Jin ^{[1
]}

Nisola, Grace M. ^{[1
]}

机构：

[1] Myongji Univ, Environm Waste Recycle Inst EWRI, Dept Energy Sci & Technol DEST, Myongji Ro 116, Yongin 17058, Gyeonggi Do, South Korea

[2] Myongji Univ, Dept Environm Engn & Energy, Myongji Ro 116, Yongin 17058, Gyeonggi Do, South Korea

[3] Univ Technol Sydney UTS, Ctr Technol Water & Wastewater, Sch Civil & Environm Engn, Sydney, NSW 2007, Australia

[4] Myongji Univ, Ctr Nutraceut & Pharmaceut Mat, Yongin 17058, Gyeonggi Do, South Korea

[5] Natl Inst Technol, Dept Life Sci, Food Microbiol & Bioproc Lab, Rourkela, India

来源：

CHEMOSPHERE | 2021年 / 263卷 / 263期

基金：

新加坡国家研究基金会; 澳大利亚研究理事会;

关键词：

Desalination; Direct contact membrane distillation; Draw solution; Forward osmosis; Ionic liquids; LCST; IMIDAZOLIUM IONIC LIQUIDS; DRAW SOLUTES; POLYMER HYDROGELS; DIFFUSION-COEFFICIENTS; PERFORMANCE EVALUATION; PHASE-SEPARATION; CARBON DIOXIDE; WATER FLUX; POLYELECTROLYTE; COMPLEXES;

D O I：

10.1016/j.chemosphere.2020.128070

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A phosphonium-based ionic liquid (IL) with lower critical solution temperature (LCST) property was assessed as a reusable draw solution (DS) for forward osmosis (FO). Tetrabutylphosphonium p-toluenesulfonate ([P4444]TsO) was successfully synthesized by neutralization reaction. Characterization results reveal its ability to generate sufficient osmotic pressure (14-68 bars for 0.5-2 M DS) to create a gradient across the FO membrane. Its thermal, physico-chemical and other colligative properties are favorable for its application as an osmotic agent. The LCST behavior of [P4444]TsO was found reversible and its phase separation from water can be done above its cloud point temperature T-c similar to 57 degrees C. In vitro cytotoxicity tests from LDH and MTT assay reveal that it can be safely used as DS at an effective concentration EC30 similar to 57 mg L-1 as its non-toxic level. Results from FO operations demonstrate that 2 M [P4444]TsO DS can effectively treat saline feed like seawater (0.6 M NaCl) with reasonable J(v) = 1.35 +/- 0.15 L m(-2)h(-1), low J(s) = 0.0038 +/- 0.00049 mol m(-2)h(-1), and considerably low specific solute flux (J(s)/J(v) - 0.0028 mol L-1). After FO, -98% of [P4444]TsO was precipitated by heating the DS at 60 degrees C and conveniently reused with consistent FO performance. Direct contact membrane distillation (DCMD) was found effective in removing the residual 2% [P4444]TsO in the DS supernatant to finally produce highquality effluent with concentrations way below the EC30 limit. Cost estimates for the entire process reveal the potential of FO combined with thermo-cyclic [P4444]TsO regeneration with DCMD for desalination application. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：10