Hydrotalcite as sorbent for trinitrophenol: Sorption capacity and mechanism

被引:150
作者
Hermosin, MC
Pavlovic, I
Ulibarri, MA
Cornejo, J
机构
[1] UNIV CORDOBA,DEPT QUIM INORGAN & INGN QUIM,CORDOBA,SPAIN
[2] CSIC,INST RECURSOS NAT & AGROBIOL,E-41080 SEVILLE,SPAIN
关键词
hydrotalcite; phenols; contaminants; filter; adsorption; layered materials; hydroxycarbonate;
D O I
10.1016/0043-1354(95)00088-3
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The aim of this work was to evaluate the sorbent power of hydrotalcite compound [Mg3Al(OH)(8)]2CO3 . xH(2)O (HT) and its calcined product Mg3AlO4(OH) (HT500) for 2,4,6-trinitrophenol (TNP) from water solution. The adsorption behaviour of TNP was investigated at diverse solid/solution ratios, pH and TNP concentration by batch equilibration technique. The L and H type adsorption isotherms obtained in those sorbents respectively indicated a chemisorption process which was irreversible and fitted the Langmuir equation model well. Sorption capacity and energy were found to be very high for HT500. The X-ray diffraction and IR spectroscopy techniques applied to TNP-HT and TNP-HT500 products indicate that anionic TNP is adsorbed by anion exchange in the interlayer of HT to 20% of the anion exchange capacity (AEC) and, by reconstruction of the layered structure on HT500, to 40% of the AEC. The results suggested the potential use of HT500 as a tilter for TNP, being also easily recyclable.
引用
收藏
页码:171 / 177
页数:7
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