Cationic polymer-immobilized polysulfone-based fibers as high performance sorbents for Pt(IV) recovery from acidic solutions.
This work reports a novel concept for the development of a polysulfone (PS)-based fiber as a high-performance acid-tolerant adsorbent for the recovery of platinum group metals (PGMs), particularly Pt(IV), in acidic media. Polyethylenimine (PEI)-coated PS-Escherichia coli biomass composite fiber (PEI-PSBF) was prepared by spinning biomass-PS blends in water, coating with PEI and cross-linking with glutaraldehyde. The E. coli biomass on the fiber was executed as a functional group donor for binding PEI. PS fiber (PSF), PS-biomass composite fiber (PSBF), and PEI-modified PSF (PEI-PSF) were also prepared and compared with PEI-PSBF. The results of SEM and FTIR analyses revealed the presence of PEI on the surface of PEI-PSBF. Kinetic and isotherm experiments showed the negligible sorption capacity of PSF. In contrast, adsorption equilibrium on PSBF and PEI-PSBF was attained after 40 min and 6h, respectively. The maximum Pt(IV) uptake of PEI-PSBF was 6.6 times higher than that of PSBF. Pt(IV) ions were completely recovered from loaded PEI-PSBF by 0.1M thiourea in 1M HCl solution. The PEI-PSBF was also stable in 0.1M and 1M HCl solutions. The PEI-PSBF exhibited promising properties as an adsorbent for PGMs-containing acidic wastewaters.
Department of Marine Environmental Engineering, Gyeongsang National University, 38 Cheondaegukchi-gil, Tongyeong, Gyeongnam 650-160, Republic of Korea.
Sung Wook
SW
Won
Sok
S
Kim
Pratap
P
Kotte
Areum
A
Lim
Yeoung-Sang
YS
Yun
D000143:Acids; D000327:Adsorption; D001673:Biodegradation, Environmental; D018533:Biomass; D003432:Cross-Linking Reagents; D004926:Escherichia coli; D005976:Glutaral / Q000737:chemistry; D007477:Ions; D007700:Kinetics; D008670:Metals; D008855:Microscopy, Electron, Scanning; D010984:Platinum / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013450:Sulfones / Q000737:chemistry*; D013499:Surface Properties; D013890:Thiourea / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D000143:Acids; D003432:Cross-Linking Reagents; D007477:Ions; D008670:Metals; D011108:Polymers; D013450:Sulfones; D014874:Water Pollutants, Chemical; C017662:polysulfone P 1700; D010984:Platinum; D013890:Thiourea; D005976:Glutaral
Biomass; Fiber; Polysulfone; Precious metals; Surface modification