Application of hydrotalcite in soil immobilization of iodate (IO₃⁻)

Abstract

Radioactive iodine is quite mobile in soil and poses threats to human health and the ecosystem. Many materials, including layered double hydroxides (LDH), have been synthesized to successfully capture iodine from aqueous environments. However, limited information is available on the application of LDH in soil to immobilize iodine species. In the present study, the feasibility of using Mg-Al-NO 3 LDH for retention of soil iodate (IO 3 À ) in both batch and column systems was analyzed. , which was 28.6 times higher than soil without LDH added. Moreover, the eluted iodate percentage was only 12.9% in the soil column with the 1.33% Mg 2 -Al-NO 3 LDH addition, whereas almost 43.5%iodate was washed out in the soil column without LDH addition. The results suggested that Mg 2 -Al-NO 3 LDH could effectively immobilize iodate in soil without obvious interference.

Molecular orientation rules the efficiency of immobilized antioxidants

“…shows the XRD patterns of the as-prepared host material. The peaks were attributed to the 00l, 01l and 11l series of Miller indices of a structure analogous to that of nitrate-containing LDHs (PDF# 35-0965) [50]. This result indicated that highly crystalline, single-phase lamellar LDH was obtained and that the interlamellar gallery was occupied by hydrated nitrate anions (d 003 = 0.890 nm).…”

Effect of Synthesis Method on Properties of Layered Double Hydroxides Containing Ni(III)

“…, where M 2+ and M 3+ are metal ions located in octahedral positions of brucite-like layers, and A n− stands for inorganic or organic anions that compensate the positive charge of brucite-like layers [1,2]. The structural features of hydrotalcite-like compounds give them a number of specific ion-exchange [3][4][5], sorption [6][7][8], electrical [9][10][11], catalytic [12][13][14], and magnetic properties [15][16][17].…”