Hydrotalcite as sorbent for trinitrophenol: Sorption capacity and mechanism
Hydrotalcite as sorbent for trinitrophenol: Sorption capacity and mechanism
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DOI：
10.1016/0043-1354(95)00088-3
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发表时间：
1996
期刊：
影响因子：
12.8
通讯作者：
M. Hermosín;I. Pavlović;M. Ulibarri;J. Cornejo
中科院分区：
文献类型：
--
作者：
M. Hermosín;I. Pavlović;M. Ulibarri;J. Cornejo
研究了水滑石[Mg3 Al（OH）8] 2CO 3·xH 2 O（HT）及其焙烧产物Mg3 AlO 4（OH）（HT 500）对水溶液中2，4，6-三硝基苯酚（TNP）的吸附性能。采用间歇平衡法研究了不同固液比、pH值和TNP浓度条件下TNP的吸附行为。吸附等温线均为L型和H型，均为不可逆的化学吸附过程，且符合Langmuir方程。吸附能力和能量被认为是非常高的HT 500。应用于TNP-HT和TNP-HT 500产品的X射线衍射和IR光谱技术表明，阴离子TNP通过HT层间阴离子交换吸附至阴离子交换容量（AEC）的20%，并且通过在HT 500上重建层状结构吸附至AEC的40%。结果表明，HT 500作为TNP的过滤器的潜在用途，也易于回收。
The aim of this work was to evaluate the sorbent power of hydrotalcite compound [Mg3Al(OH)8]2CO3·xH2O (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 filter for TNP, being also easily recyclable.