Gaseous Arsenic Capture in Flue Gas by CuCl2-Modified Halloysite Nanotube Composites with High-Temperature NOx and SOx Resistance

• DOI: 10.1021/acs.est.2c00031
• Publication Date: 2022-02-22T18:40:37Z
• Authors: Xue-Lei Duan; Chun-Gang Yuan; Kai-Qiang He; Jie-Xuan Yu; Yang-Hong Jiang; Qi Guo; Yan Li; Su-Juan Yu; Jing-Fu Liu
• Keywords: Halloysite; Selective catalytic reduction

Gaseous arsenic emitted from coal combustion flue gas (CCFG) causes not only severe contamination of the environment but also failure selective catalytic reduction (SCR) catalysts in power plants. Development inexpensive and effective adsorbents or techniques for removal high-temperature CCFG is crucial. In this study, halloysite nanotubes (HNTs) at low price were modified with CuCl2 (CuCl2–HNTs) through ultrasound assistance applied capturing As2O3(g) simulated (SFG). Experiments on adsorption performance, mechanism, energy based density functional theory performed. Modification clearly enhanced uptake capacity (approximately 12.3 mg/g) 600 °C SFG. The adsorbent exhibited favorable tolerance to high concentrations NOx SOx. As2O3(III) was oxidized transformed into As2O5(V) CuCl2–HNTs. Al–O bridge had highest O end As–O group (−2.986 eV), combination formed between arsenic-containing groups aluminum stable. addition, captured could be stabilized sorbent temperature, making it possible use before SCR system. This demonstrates that CuCl2–HNTs a promising oxidation CCFG.