Microscopic Spherical α-Fe<sub>2</sub>O<sub>3</sub> for Highly Efficient Gaseous Arsenic Capture in Simulated Flue Gas Under a Wide Temperature Range
Pengcheng Zhao, Guan Jian, Qianyan Liu, Jiang Wu, Yang Ling, Ping He, Hong Yao, Guangqian Luo, Jiandong Hong, Xialin Xie
Abstract
Arsenic emitted from coal-fired flue gas poses a threat to human health and the ecological environment due to its high toxicity and bioaccumulation. In this work, the microscopic spherical α-Fe2O3 sorbent was prepared by a one-step hydrothermal method to effectively capture arsenic in the flue gas. The effects of reaction temperature, sulfur dioxide (SO2), nitric oxide (NO), oxygen (O2), and inlet arsenic concentration on its adsorption performance were investigated. The results showed that the most suitable adsorption temperature was 600 °C, and As2O3(g) was finally fixed in the product in the form of FeAsO4. SO2 and O2 played a positive role in the adsorption of arsenic, while NO displayed a slight effect on the adsorption of arsenic. In addition, the arsenic adsorption capacity improved with the increase of the inlet arsenic concentration. Based on its excellent arsenic removal performance and SO2 resistance performance, the α-Fe2O3 sorbent can be considered a promising material for arsenic removal.