Silver/graphene oxide nanocomposite: Process optimization of mercury sensing and investigation of crystal violet removal
Nguyen Minh Dat, Doan Ba Thinh, Nguyen Thanh Hoai Nam, Nguyễn Duy Hải, Le Minh Huong, Nguyen Thi Hanh, Mai Thanh Phong, Nguyễn Hữu Hiếu
Abstract
In this work, the silver/graphene oxide (AG) nanocomposite was synthesized with various AgNO 3 :GO ratios according to our previous studies. The characterization of AG nanocomposites is determined through modern analytical methods, resulting in particle sizes of 18.09 ± 3.78 nm (1:1 wt/wt − AG2) and 22.88 ± 4.67 nm (1.25:1 wt/wt − AG3). Further investigations on the smallest variation of factors affecting the Hg(II) sensing ability of AG nanocomposite were examined through the Box-Behnken model. The obtained results showed that the sensing performance of AG3 achieved a limit of detection of 19.06 ± 0.42 μg/L with AG dose of 49.21 mg/L, solution salinity of 52 ‰, and interaction time of 10.08 min. The acceptable relative standard deviation of 6.7% revealed the high precision of the treatment. Meanwhile, AG2 demonstrates the highest adsorption capacity towards CV, attaining 100 % of removal with the initial concentration of less than 25 mg/L; concurrently, the adsorption behavior follows the Langmuir isotherm model and provides impressive reusability. The research has introduced the AG nanocomposite as a promising material in Hg(II) sensing and crystal violet removal.