Preparation of nanostructured goethite by chemical precipitation in a rotating packed bed. Issue 2 (15th January 2023)

• Record Type: Journal Article
• Authors: Lin, Chia-Chang; Lin, Jun-Hong; Wu, Kuan-Yi
• Is Part Of: Ceramics international. Volume 49:Issue 2(2023)
• Page Start: 1874
• Page End: 1879
• Publication Date: 2023-01-15
• Subjects: Rotating packed bed -- Nanostructured goethite -- Precipitation -- Dye adsorption; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.09.151
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Nanostructured goethite was successfully prepared at 25°C by chemical precipitation in the rotating packed bed in which the rotational speed was 1800 rpm, the flow rate of aqueous FeCl3 with a concentration of 0.3 mol/L was 0.5 L/min, and the flow rate of aqueous NaOH with a concentration of 0.9 mol/L was 0.5 L/min. The prepared nanostructured goethite had an average crystallite size of 20 nm and a needle shape with a mean length of 500 nm. Moreover, the prepared nanostructured goethite exhibited the Type-III isotherm for N2 adsorption-desorption with a BET specific surface area of 23 m 2 /g. The rotating packed bed with the chemical precipitation approach yielded a rate of preparation of nanostructured goethite of about 19 kg/day. The adsorption capacity of the prepared nanostructured goethite was examined using the adsorption of dyes in water. Based on the Langmuir model, its maximum adsorption capacity for Reactive Red 2 was 29.1 mg/g, and its maximum adsorption capacity for Orange G was 24.5 mg/g. Accordingly, the prepared nanostructured goethite can be used as a potential adsorbent for removing dyes from water.