Abstract PS-D2EHPA beads were prepared by immobilizing di-2-ethylhexyl-phosphoric acid (D2EHPA) with polysulfone (PSf). The removal experiments of Cu(II) and Pb(II) by the prepared PS-D2EHPA beads were conducted batchwise. The removal efficiency of Cu(II) and Pb(II) by PS-D2EHPA beads was increased with increasing pH of solution. The removal rate of Cu(II) and Pb(II) was well described by the pseudo-second-order kinetic model. The maximum removal capacity of Cu(II) and Pb(II) obtained from Langmuir isotherm were 2.58 mg/g and 12.63 mg/g, respectively. External mass transfer coefficients for the removal of Cu(II) and Pb(II) by PS-D2EHPA beads were obtained 0.61×10-2∼ 5.87×10-2 /min and 1.55×10-2∼8.53×10-2 /min, respectively and diffusion coefficients were obtained 1.32×10-4∼ 3.98×10-4 cm2/min and 1.80×10-4∼2.28×10-4 cm2/min, respectively.

The objective of this research is to evaluate optimal conditions of permeability and selectivity on the polysulfone membrane for efficiency of separation of CH4 by checking four factors which are temperature, pressure, gas compositions and gas flow rates. When higher pressure was applied at the input, lower efficiency of recovery of CH4 and higher efficiency of separation of CH4 were shown. It has the tendency to show lower efficiency of recovery of CH4 and higher efficiency of separation of CH4 at the output as higher temperature at input. The lower flow rates make higher efficiency of recovery of CH4 and lower efficiency of separation of CH4. Finally, over 90% efficiency for CH4 separation and recovery conditions are temperature (-5℃), pressure (8 bar), gas composition rate (6:4) (CH4:CO2) and gas flow rate (5 ℓ/min). These conditions make higher separation and recovery efficiency such as 90.1% and 92.1%, respectively.