Pyrogenic temperature affects the particle size of biochar-supported nanoscaled zero valent iron (nZVI) and its silver removal capacity |
| |
| Authors: | Shengsen Wang Mingyue Zhao Yiting Zhao Nong Wang Jing Bai Ke Feng |
| |
| Affiliation: | 1. Ministry of Agriculture/Tianjin Key Laboratory of Agro-environment and Safe-product, Tianjin, China;2. College of Environmental Science and Engineering, Yangzhou University, Yangzhou, China;3. College of Environmental Science and Engineering, Yangzhou University, Yangzhou, China;4. Agro-environmental Protection Institute, Ministry of Agriculture of the People’s Republic of China, Tianjin, China;5. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China |
| |
| Abstract: | Particle size of nanoscaled zero valent iron (nZVI) in nanocomposites can be affected by support materials. In this work, nZVI was supported by bamboo-derived biochars produced at 450 °C (BBL) and 600 °C (BBH). Total iron (Fe) contents were 14.4 and 11.9% for nZVI immobilized in BBL (nZVI/BBL) and BBH (nZVI/BBH), respectively. The resultant nanocomposites were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and scanning electron microscopy/energy-dispersive X-ray analyses (SEM/EDS). The nZVI was successfully embedded in biochar pores and surfaces as confirmed by SEM/EDS and XRD. TEM revealed that particle sizes of nZVI in nZVI/BBL and nZVI/BBH were roughly 26 and 40 nm, respectively. The Ag+ sorption isotherms (25–300 mg L?1 Ag+) suggested that 1 kg of nZVI in nZVI/BBL and nZVI/BBH removed as much as 745.5 and 534.5 g Ag+, respectively. The results suggested that Ag+ removal capacity was related to particle size of nZVI, which was also affected by pyrogenic temperature. |
| |
| Keywords: | Zero valent iron pyrogenic temperature particle size biochar silver ion reduction |
|
|
