Simultaneous Removal of Pb۲+ and Cu۲+ by SBA-۱۵/di-Urea as a Nano Adsorbent

In this study, the potential of SBA-۱۵/di-urea nanoporous silica compound for the removal of Pb۲+ and Cu۲+ ions was investigated. The presence of organic groups in the silica framework of SBA-۱۵/di-urea was demonstrated by the FT-IR spectrum. The functionalized product showed the BET surface area ۵۱۸ m۲/g and pore diameter ۶.۵ nm, based on adsorption-desorption of N۲ at ۷۷ K. SEM revealed a rod-shaped morphology, and the TEM image showed an ordered array of ۲D hexagonal mesoporous SBA-۱۵. The ions in the samples were identified by flame atomic absorption spectrometry. The effect of adsorbent amount, contact time, metal concentration, pH, and presence of other metals on removal efficiency has been studied. Simultaneous removal of Pb۲+ and Cu۲+ ions from ۲۰ mL of the sample solution containing ۶۰ μg of each ion were completely done at pH greater than ۵.۰ after stirring for ۱۵ minutes. Langmuir, Freundlich, and Temkin adsorption isotherms were evaluated for both adsorbates and it was determined that the data fitted well with the Langmuir model (R۲> ۰.۹۸). The maximum capacity of the adsorbent was found to be ۱۴۷.۰ ± ۰.۶ mg and ۷۷.۰ ± ۰.۵ mg of Pb۲+ and Cu۲+ ions/g SBA-۱۵/di-urea, respectively. The lowest amount of ۳M nitric acid for stripping the target species from adsorbent was determined as ۲۰ mL. The application of this methodology for the real sample was tested by an Industrial wastewater sample.

کلیدواژه ها:

SBA-۱۵/di-urea ، Simultaneous removal ، Pb۲+ ، Cu۲+ ، Wastewater