ZHANGYan-ping,FANXu-teng,LIYi-bing,et al.Activated Carbon Fiber Modified with Sludge Acid Extract and Fe2+ for Ammonia Nitrogen Adsorption[J].China Water & Wastewater,2024,40(1):82-89.
Activated Carbon Fiber Modified with Sludge Acid Extract and Fe2+ for Ammonia Nitrogen Adsorption
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第1期
Page:
82-89
Column:
Date of publication:
2024-01-01
- Keywords:
- activated carbon fiber (ACF); sludge acid extract; waterworks sludge; ammonia nitrogen; adsorption
- Abstract:
- The ammonia nitrogen adsorption material Fe/Al-ACF was prepared by using activated carbon fiber (ACF) as the carrier and sludge acid extract (Sae) and ferrous chloride mixture as the modifier. Fe/Al-ACF had good stability in water and good ammonia nitrogen removal performance under neutral and alkaline conditions. When the temperature was 25 ℃, ammonia nitrogen was 20 mg/L, Fe/Al-ACF dosage was 2.0 g/L, pH was 7, and the reaction time was 240 min, the removal rate of ammonia nitrogen by Fe/Al-ACF was 90.52%, and the removal rate was still 59.16% after 4 cycles of regeneration. The adsorption of ammonia nitrogen by Fe/Al-ACF conformed to the quasi-second-order kinetic model, Elovich model and Langmuir isotherm adsorption model. The adsorption process was a spontaneous endothermic chemical monolayer adsorption involving electrostatic attraction, and the adsorption rate was related to the surface adsorption capacity. The results of scanning electron microscope (SEM), X-ray diffractometer (XRD) and Fourier transform infrared spectroscope (FTIR) combined with thermodynamic analysis showed that there were a large number of acicular and stalactites shaped iron and aluminum oxide crystals (Fe3O4, γ-Fe2O3 and Al2O3) growing between the ravines on the surface of Fe/Al-ACF, which participated in the adsorption process, and the adsorption process involved complex reaction and hydrogen bonding between N and O.
Last Update:
2024-01-01