Removal of Phosphorus from Wastewater by Different Morphological Alumina

• Main Authors: Jianchuan Sun, Awang Gao, Xuhui Wang, Xiangyu Xu, Jiaqing Song
• Format: Article
• Language: English
• Published: MDPI AG 2020-07-01
• Series: Molecules
• Subjects: adsorption; alumina; phosphorus; high surface area; morphology
• Online Access: https://www.mdpi.com/1420-3049/25/13/3092

In this work, an organic-free method was used to synthesize different morphological boehmite by controlling the crystallization temperature, and alumina adsorbents were obtained by baking the boehmites at 500 °C. The alumina adsorbents were characterized by X-ray diffraction (XRD), High resolution transmission electron microscope (HRTEM), Fourier transform infrared (FT-IR), N₂ adsorption/desorption analysis, and their phosphorus adsorption properties were comparatively investigated by a series of experiments. The results showed that the self-prepared alumina adsorbents were lamellar and fibrous material, while the industrial adsorbent was a granular material. The lamellar alumina adsorbents had the largest specific surface area and showed better phosphorus adsorption capacity. The maximum adsorption capacity could reach up to 588.2 mg·g⁻¹; and only 0.8 g·L⁻¹ of lamellar alumina adsorbent is needed to treat 100 mg·L⁻¹ phosphorus solution under the Chinese level 1 discharge standard (0.5 mg·L⁻¹). Further investigation suggests that the lamellar alumina adsorbent kept high adsorption capacity in various solution environments.