Removal of Pb(II) from aqueous solution using modified and unmodified kaolinite clay.
Modified kaolinite clay with 25% (w/w) aluminium sulphate and unmodified kaolin were investigated as adsorbents to remove Pb(II) from aqueous solution. The results show that amount of Pb(II) adsorbed onto modified kaolin (20mg/g) was more than 4.5-fold than that adsorbed onto unmodified kaolin (4.2mg/g) under the optimized condition. In addition, the linear Langmuir and Freundlich models were used to describe equilibrium isotherm. It is observed that the data from both adsorbents fitted well to the Langmuir isotherm. The kinetic adsorption of modified and unmodified kaolinite clay fitted well to the pseudo-second-order model. Furthermore, both modified and unmodified kaolinite clay were characterized by X-ray diffraction, Fourier transform infrared (FT-IR) and scanning electron microscope (SEM). Finally, both modified and unmodified kaolinite clay were used to remove metal ions from real wastewater, and results show that higher amount of Pb(II) (the concentration reduced from 178 to 27.5mg/L) and other metal ions were removed by modified kaolinite clay compared with using unmodified adsorbent (the concentration reduced from 178 to 168 mg/L).
Jiang
Ming-qin
MQ
School of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, China.
Wang
Qing-ping
QP
Jin
Xiao-ying
XY
Chen
Zu-liang
ZL
D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry; D000077215:Clay; D007616:Kaolin / Q000737:chemistry*; D007700:Kinetics; D007854:Lead / Q000302:isolation & purification*; D008670:Metals / Q000302:isolation & purification; D012996:Solutions; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D000538:Aluminum Silicates; D008670:Metals; D012996:Solutions; D014874:Water Pollutants, Chemical; D007616:Kaolin; D007854:Lead; D000077215:Clay