Selective removal for Pb2+ in aqueous environment by using novel macroreticular PVA beads.
Batch sorption experiments were conducted using macroreticular poly(vinyl alcohol) (MR-PVA) beads as a adsorbent to adsorb Pb(II) from both single component system and multi-metal solution in which experimental parameters were studied including solution pH, contact time, adsorbent dose, initial concentration of metal ions and ionic strength. The equilibrium isotherms were determined at pH 6 under constant ionic strength and at different temperatures. The results showed that the maximum adsorption capacity of Pb(II) (213.98 mg g(-1)) with 1 g L(-1) of adsorbent was observed at 300 mg L(-1) at an initial pH value of 6.0 under temperature of 288 K. Removals of about 60% occurred in 30 min, and equilibrium was attained at around 150 min. The equilibrium data for the adsorption of Pb(II) on MR-PVA beads was tested with various adsorption isotherm models among which three models were found to be suitable for the Pb(II) adsorption. In addition, the kinetic adsorption fitted well to the pseudo-second-order model and the corresponding rate constants were obtained. Thermodynamic aspects of the adsorption process were also investigated.
Zhang
Yun
Y
State Key Laboratory of Applied Organic Chemistry, College of Resources and Environment, Institute of Biochemical Engineering & Environmental Technology, Lanzhou University, Lanzhou, PR China.
Li
Yanfeng
Y
Li
Xiaoli
X
Yang
Liuqing
L
Bai
Xue
X
Ye
Zhengfang
Z
Zhou
Lincheng
L
Wang
Liyuan
L
D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007854:Lead / Q000302:isolation & purification*; D008863:Microspheres; D009994:Osmolar Concentration; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D016062:Porosity; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
D014874:Water Pollutants, Chemical; D007854:Lead; D011142:Polyvinyl Alcohol