TY - GEN
T1 - Pb(II) biosorption on reed biosorbent derived from wetland
T2 - Effect of pretreatment on functional groups
AU - Southichak, Bounheng
AU - Nakano, K.
AU - Nomura, M.
AU - Chiba, N.
AU - Nishimura, O.
PY - 2006
Y1 - 2006
N2 - Reed biomass harvested from wetland constructed for water purification was modified into a biosorbent for Pb(II) removal from aqueous solution. The enhancement of Pb(II) adsorption by reed biosorbent depended not only on the types of reagent used for pretreatment, but also on the pH during the pretreatment process. The mechanisms, as elucidated using relational data obtained from Boehm titration, Fisher esterification and FTIR, involved the conversion of carboxylic groups into carboxylate groups, and proved the role of the carboxylate group, which occupied more than 800% in binding Pb(II). The Langmuir sorption isotherm of Pb(II) by R-NaOH-12 showed Qmax and b values of 0.082 mmol/g and 312.5 g/mmol, suggesting enough adsorption performance to reduce the concentration of Pb(II) to meet the range of WHO guidelines. The salinity of aqueous solution containing NaH2PO4 and NANO3 promoted the adsorption of Pb(II), while NaCl and Na2SO4 suppressed the adsorption capacity of Pb(II). The adsorption mechanism of reed biosorbent provides valuable insight on the pretreatment effects and the advantages of utilizing this plant as biosorbent for Pb(II) and other heavy metals.
AB - Reed biomass harvested from wetland constructed for water purification was modified into a biosorbent for Pb(II) removal from aqueous solution. The enhancement of Pb(II) adsorption by reed biosorbent depended not only on the types of reagent used for pretreatment, but also on the pH during the pretreatment process. The mechanisms, as elucidated using relational data obtained from Boehm titration, Fisher esterification and FTIR, involved the conversion of carboxylic groups into carboxylate groups, and proved the role of the carboxylate group, which occupied more than 800% in binding Pb(II). The Langmuir sorption isotherm of Pb(II) by R-NaOH-12 showed Qmax and b values of 0.082 mmol/g and 312.5 g/mmol, suggesting enough adsorption performance to reduce the concentration of Pb(II) to meet the range of WHO guidelines. The salinity of aqueous solution containing NaH2PO4 and NANO3 promoted the adsorption of Pb(II), while NaCl and Na2SO4 suppressed the adsorption capacity of Pb(II). The adsorption mechanism of reed biosorbent provides valuable insight on the pretreatment effects and the advantages of utilizing this plant as biosorbent for Pb(II) and other heavy metals.
KW - Biosorption mechanism
KW - Functional group
KW - Lead(II)
KW - Pre-treatment
KW - Reed
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U2 - 10.2166/wst.2006.788
DO - 10.2166/wst.2006.788
M3 - Conference contribution
C2 - 17165456
AN - SCOPUS:33845310047
SN - 1843395851
SN - 9781843395850
T3 - Water Science and Technology
SP - 133
EP - 141
BT - 5th World Water Congress
ER -