Microscopic Spherical α-Fe2O3 for Highly Efficient Gaseous Arsenic Capture in Simulated Flue Gas Under a Wide Temperature Range

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 alpha-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 (O-2), and inlet arsenic concentration on its adsorption performance were investigated. The results showed that the most suitable adsorption temperature was 600 degrees C, and As2O3 (g) was finally fixed in the product in the form of FeAsO4 center dot SO2 and O-2 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 alpha-Fe2O3 sorbent can be considered a promising material for arsenic removal.

Automated summary

The study prepared microscopic spherical alpha-Fe2O3 sorbent by one-step hydrothermal method for effective arsenic capture in coal-fired flue gas. Factors such as reaction temperature, sulfur dioxide, nitric oxide, oxygen, and arsenic concentration were investigated for their adsorption performance effects. The sorbent showed promising arsenic removal performance and sulfur dioxide resistance, making it a potential material for arsenic removal.