Bajda Tomasz, Szala Barbara, Solecka Urszula
a Faculty of Geology, Geophysics and Environment Protection, Department of Mineralogy, Petrography and Geochemistry , AGH University of Science and Technology , al. Mickiewicza 30, 30-059 Krakow , Poland.
Environ Technol. 2015;36(22):2872-83. doi: 10.1080/09593330.2015.1051135. Epub 2015 Jun 10.
Smectite has been modified using hexadecyltrimethyl ammonium bromide in an amount of double cationic exchange capacity. This alteration makes it possible to use organo-smectite as a sorbent to remove anionic forms. The experiment consisted of the interchangeable sorption of phosphate(V) and lead(II) by organo-smectite. Research was carried out with varying pH (2-5) and various concentrations (0.1-5 mmol/L). Organo-smectite with previously adsorbed lead ions removed more phosphate than the untreated organo-smectite. Experimental data show that lead is more likely to absorb on the organo-smectite than on the organo-smectite with previously adsorbed phosphate ions. It follows that the most effective use of the organo-smectite is through the sorption of first - Pb cations and then PO4 anions. With an increasing concentration of Pb(II) or P(V), the sorption efficiency increases. The maximum sorption efficiency of lead and phosphate ions is observed at pH 5. This enables the removal of harmful lead and phosphorus compounds from waste water and immobilizes them on the sorbent's surface. The alternating reactions of lead and phosphorus ions result in the crystallization of brompyromorphite Pb5(PO4)3Br.
蒙脱石已用十六烷基三甲基溴化铵以两倍阳离子交换容量的量进行了改性。这种改变使得有机蒙脱石能够用作吸附剂来去除阴离子形式。该实验包括有机蒙脱石对磷酸根（V）和铅（II）的交替吸附。研究在不同的pH值（2 - 5）和各种浓度（0.1 - 5 mmol/L）下进行。预先吸附了铅离子的有机蒙脱石比未处理的有机蒙脱石去除了更多的磷酸盐。实验数据表明，铅比预先吸附了磷酸根离子的有机蒙脱石更易吸附在有机蒙脱石上。由此可知，有机蒙脱石最有效的利用方式是先吸附铅阳离子，然后吸附磷酸根阴离子。随着铅（II）或磷（V）浓度的增加，吸附效率提高。在pH 5时观察到铅离子和磷酸根离子的最大吸附效率。这能够从废水中去除有害的铅和磷化合物，并将它们固定在吸附剂表面。铅离子和磷酸根离子的交替反应导致溴磷灰石Pb5(PO4)3Br结晶。
