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Sorption of lead from
aqueous solutions by spent tea leaf
Yoshita, A., Lu, J.L., Ye,
J.H. and Liang, Y.R.*
Zhejiang
University Tea Research Institute, 268 Kaixuan Road,
Hangzhou 310029, China.
*Corresponding author. E-mail:
yrliang@zju.edu.cn.
Fax: +86 571 86971704.
Accepted
14 April, 2009 |
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An adsorbent was prepared using spent tea leaf and was used
to remove lead (Pb) from solution. The Pb removal by the
spent tea leaf adsorbent depended on pretreatment of spent
tea leaf, adsorption contact time and adsorbent dosage. The
optimum pretreatment conditions were confirmed to be that
tea leaf was ground to 0.28-0.45
mm in diameter and then drenched in 0.3 M NaOH for 12 h.
Adsorption kinetic study showed that the adsorption
of Pb onto the spent tea leaf followed
the
pseudo-second-order model. The adsorption
was time dependent and adsorbent dosage dependent. The
optimum contact time was 8 h.
Key
words:
Camellia sinensis, spent tea leaf, adsorbent, lead
removal, adsorption kinetics. |
