چكيده به لاتين
Using liquid membrane and, in particular, supported liquid membrane (SLM) is a novel method of separation in comparison to other methods such as adsorption, extraction and ion exchange. SLM is a combination of simultaneous extraction and disposal whose high efficiency and capability is proven by many studies. So far, many researchers have utilized SLM in various scientific fields including analytical chemistry, organic and inorganic chemistry, chemical engineering, biotechnology and bio pharmaceutics. Dynamic transfer, high selectivity, possibility of expensive carriers usage, low energy consumption and low operational costs are part of the advantages attributed to SLM. This work presents experimental studies for Pb2+ ion pertraction using flat sheet supported liquid membrane (SLM) operated in a batch mode. Carrier di-(2-ethylhexyl) phosphoric acid (D2EHPA) diluted with xylene has been used as the membrane phase. The effect of different physical and chemical parameter such as stirring speed, pH of feed phase, carrier concentration, stripping solution concentration has been investigated on the extraction of Pb(II). Highest separation and flux value of 85.24% and 3.9710-6mol/(m2.s) was observed for 20% v/v D2EHPA as the carrier, pH of feed phase at 4.5, keeping the stripping acidity at 0.1M HCl and stirring speed of 350 rpm. The support was used in experiments was PTFE with 0.45 μm pore size. The membrane was found to be stable over 45 h of operation.
