Marković Marija, Daković Aleksandra, Rottinghaus George E, Kragović Milan, Petković Anđela, Krajišnik Danina, Milić Jela, Mercurio Mariano, de Gennaro Bruno
Institute for Technology of Nuclear and Other Mineral Raw Materials, Franše d' Epere 86, 11000 Belgrade, Serbia.
Institute for Technology of Nuclear and Other Mineral Raw Materials, Franše d' Epere 86, 11000 Belgrade, Serbia.
Colloids Surf B Biointerfaces. 2017 Mar 1;151:324-332. doi: 10.1016/j.colsurfb.2016.12.033. Epub 2016 Dec 23.
In this study, organozeolites were prepared by treatment of the natural zeolites (clinoptilolite and phillipsite) with cetylpyridinium chloride (CP) equivalent to 50 and 100% of their external cation exchange capacities (ECEC). Organoclinoptilolites (ZCPs) and organophillipsites (PCPs) were characterized by FTIR spectroscopy, thermal analysis, determination of the point of zero charge and zeta potential. Adsorption of zearalenone (ZEN) by ZCPs and PCPs at pH 3 and 7 was investigated. Results showed that adsorption of ZEN increases with increasing amounts of CP at the zeolitic surfaces for both ZCPs and PCPs but the adsorption mechanism was different. Adsorption of ZEN by ZCPs followed a linear type of isotherm at pH 3 and 7 while ZEN adsorption by PCPs showed non linear (Langmuir and Freundlich) type of isotherm at both pH values. Different interactions between the ZEN molecule (or ion) and ZCPs and PCPs occurred: partition (linear isotherms) and adsorption in addition to partition (non linear isotherms), respectively. For the highest level of organic phase at the zeolitic surfaces, the maximum adsorbed amount of ZEN was 5.73mg/g for organoclinoptilolite and 6.86mg/g for organophillipsite at pH 3. Slightly higher adsorption: 6.98mg/g for organoclinoptilolite and 7.54mg/g for organophillipsite was achieved at pH 7. The results confirmed that CP ions at both zeolitic surfaces are responsible for ZEN adsorption and that organophillipsites are as effective in ZEN adsorption as organoclinoptilolites.
在本研究中，通过用相当于天然沸石（斜发沸石和丝光沸石）外部阳离子交换容量（ECEC）50%和100%的十六烷基吡啶氯化物（CP）处理天然沸石来制备有机沸石。通过傅里叶变换红外光谱（FTIR）、热分析、零电荷点测定和zeta电位对有机斜发沸石（ZCPs）和有机丝光沸石（PCPs）进行了表征。研究了ZCPs和PCPs在pH值为3和7时对玉米赤霉烯酮（ZEN）的吸附情况。结果表明，对于ZCPs和PCPs，ZEN的吸附量均随沸石表面CP含量的增加而增加，但吸附机制不同。ZCPs对ZEN的吸附在pH值为3和7时遵循线性等温线类型，而PCPs对ZEN的吸附在两个pH值下均呈现非线性（Langmuir和Freundlich）等温线类型。ZEN分子（或离子）与ZCPs和PCPs之间发生了不同的相互作用：分别为分配（线性等温线）和除分配外的吸附（非线性等温线）。在沸石表面有机相含量最高时，在pH值为3时，有机斜发沸石对ZEN的最大吸附量为5.73mg/g，有机丝光沸石为6.86mg/g。在pH值为7时吸附量略高：有机斜发沸石为6.98mg/g，有机丝光沸石为7.54mg/g。结果证实，两个沸石表面的CP离子均对ZEN的吸附起作用，并且有机丝光沸石在ZEN吸附方面与有机斜发沸石一样有效。
