Facile synthesis of novel Cu0@SiO2 adsorbents derived from rice husk for highly efficient capture iodine gas

Exploring novel iodine sorbent with high efficiency and low cost is a meaningful and challenging topic. Herein, a series of iodine sorbents Cu 0 @SiO 2 were firstly prepared by using SiO 2 derived from rice husks as support materials. The obtained Cu 0 @SiO 2 materials were employed to capture iodine gas. The effects of Cu content, contact time and adsorption temperature on the iodine adsorption behavior were investigated. The I 2 adsorption capacity of Cu 0 @SiO 2 reached up to 1105 mg/g with short time at 200 °C. The high chemical iodine adsorption ratio (95.11%) was achieved. Furthermore, the iodine capture mechanism for Cu 0 @SiO 2 was mainly chemical, that is formation of stable CuI by chemical reaction between Cu 0 and I 2 . The results demonstrated that Cu 0 @SiO 2 derived from rice husk was a potential promising adsorbent owing to the low cost and high capture efficiency. Graphical Abstract Novel Cu 0 @SiO 2 with high I 2 adsorption capacity and low cost was facilely fabricated using rice husk-based SiO 2 as support. I 2 adsorption capacity of Cu 0 @SiO 2 reached up to 1105 mg/g. The high chemical iodine adsorption ratio (95.11%) was achieved. Adsorption mechanism was that Cu 0 reacted with I 2 to form stable CuI. Highlights Novel Cu 0 @SiO 2 with high I 2 adsorption capacity and low cost was reported. Cu 0 @SiO 2 was facilely fabricated using rice husk-based SiO 2 as support. I 2 adsorption capacity of Cu 0 @SiO 2 reached up to 1105 mg/g. The high chemical iodine adsorption rate (95.11%) was achieved. Adsorption mechanism was that Cu 0 reacted with I 2 to form stable CuI.