Сорбция цианидных комлексных анионов железа (III) регенерируемым сорбентом на основе двойного гидроксида магния-алюминия

Magnesium-aluminum hydroxide Mg0.845Al0.155(OH)2(NO3)0.034(OH)0.121·0.9H2O hydrotalcite-structured was synthesized. The hydroxide sorption properties concerning Fe(CN)63anions were investigated. The anion exchange capacity was found to be 0.201 mmol Fe(CN)63-/g of sorbent. In process of sorption of NO3 and OHanions, compensating positive charge of hydroxide layers HO-M-OH, where М Мg2+, Al3+, were replaced by Fe(CN)63anions. The type of hydroxide lattice did not change but basal spacing of (003) was shifted from 0.78 nm to 1.11 nm. IR-spectroscopy data showed that Fe(CN)63ions mainly stayed in the sorbent, free from chemical bonds nitrogen atoms of CN-groups. The sorbent was regenerated with 1 M NaOH solution and tested in the sorption-desorption cycles work.