Université Cadi Ayyad, Ecole Nationale des Sciences Appliquées Safi, Morocco.
Environ Technol. 2011 Feb-Mar;32(3-4):363-72. doi: 10.1080/09593330.2010.499547.
The purpose of this work was to study the synthesis of pillared interlayered clays from Moroccan stevensite called locally 'Ghassoul'. This clay has been intercalated with cetyltrimethylammonium surfactant (CTA-Stv) and aluminium hydroxypolycation (Al13-Stv). Characterization studies were performed using XRF, XRD, FTIR and DTA/TG analysis. Basal spacing values of Al13-Stv and CTA-Stv increased respectively from 13.5 A for natural stevensite to 17.5 and 17.6 A with increasing Al13(7+)/clay and CTA+/clay ratios. The DTA/TG results showed that Al13-Stv has a relatively high thermal stability compared with CTA-Stv. A quasi-irreversible intercalation by exchanging the interlayer inorganic cations with voluminous pillars Al13(7+) or CTA+ was observed. Batch adsorption of chromate anions from aqueous solutions was investigated and the results showed that both pillared clays had great affinity for the chromate compared with untreated stevensite. The Dubinin-Kaganer-Radushkevich (DKR) model was selected to describe the adsorption isotherms. The maximum adsorption capacities for natural stevensite, Al13-Stv and CTA-Stv are 13.7, 75.4 and 195.6 mmol/kg, respectively.
这项工作的目的是研究从摩洛哥绿坡缕石（当地称为“Ghassoul”）合成层柱粘土。这种粘土已经用十六烷基三甲基溴化铵（CTA-Stv）和铝羟基多阳离子（Al13-Stv）进行了插层。采用 XRF、XRD、FTIR 和 DTA/TG 分析进行了表征研究。Al13-Stv 和 CTA-Stv 的基面间距值分别从天然绿坡缕石的 13.5 A 增加到 17.5 和 17.6 A，随着 Al13(7+)/粘土和 CTA+/粘土比例的增加。DTA/TG 结果表明，Al13-Stv 与 CTA-Stv 相比具有相对较高的热稳定性。观察到通过用体积庞大的支柱 Al13(7+)或 CTA+交换层间无机阳离子进行准不可逆插层。研究了水溶液中铬酸根阴离子的批吸附，结果表明，与未处理的绿坡缕石相比，两种层柱粘土对铬酸根都具有很强的亲和力。选择 Dubinin-Kaganer-Radushkevich (DKR) 模型来描述吸附等温线。天然绿坡缕石、Al13-Stv 和 CTA-Stv 的最大吸附容量分别为 13.7、75.4 和 195.6 mmol/kg。
