Details

Autor(en) / Beteiligte

• Du, Yucheng
• Zhen, Shuang
• Wang, Jinshu
• Ma, Yanlong
• Wu, Junshu
• Dai, Hongxing

Titel

FeOOH-MnO2/Sepiolite and Fe2O3-MnO2/Diatomite: Highly efficient adsorbents for the removal of As(V)

Ist Teil von

• Applied clay science, 2022-06, Vol.222, p.106491, Article 106491

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• As(V) in aquatic environment has posed a great threat to human beings due to its high mobility and toxicity. Developing economical and efficient adsorbents is vital for the removal of arsenic contamination in wastewater. We herein report the synthesis of FeOOH-MnO2/Sepiolite and Fe2O3-MnO2/Diatomite using the hydrothermal treatment method at 180 °C for 12 h with KMnO4, MnCl2, and FeCl3 as metal source and urea as precipitating agent. The FeOOH-MnO2 or Fe2O3-MnO2 composite was in situ grown on the sepiolite or diatomite support, resulting in a significant enhancement in surface area (which was 77.4 and 83.0 m2/g for the supported FeOOH-MnO2 and Fe2O3-MnO2 samples, respectively). FeOOH-MnO2/Sepiolite and Fe2O3-MnO2/Diatomite could effectively remove As(V), with the maximal As(V) adsorption capacities at 25 °C and pH = 7 being 124.3 and 148.2 mg/g, respectively. Furthermore, both samples exhibited good recycle As(V) adsorption performance. In addition. As(V) adsorption mechanisms of the samples were also discussed. The As(V) adsorption on FeOOH-MnO2/Sepiolite and Fe2O3-MnO2/Diatomite obeyed the Freundlich and Langmuir isothermal adsorption models, respectively. Considering their simple synthesis processes and excellent adsorption performance, we are sure that FeOOH-MnO2/Sepiolite and Fe2O3-MnO2/Diatomite are promising adsorbents for arsenic removal from wastewater. The FeOOH-MnO2/Sepiolite and Fe2O3-MnO2/Diatomite samples obtained after the hydrothermal treatment at 180 °C for 12 h show the maximal As(V) adsorption capacities of 124.3 and 148.2 mg/g, respectively. [Display omitted] •FeOOH-MnO2 and Fe2O3-MnO2 are in situ grown on sepiolite and diatomite via the hydrothermal route, respectively.•FeOOH-MnO2/Sepiolite and Fe2O3-MnO2/Diatomite display high surface areas of 77.4 and 83.0 m2/g, respectively.•As(V) adsorption capacities of FeOOH-MnO2/Sepiolite and Fe2O3-MnO2/Diatomite are 124.3 and 148.2 mg/g, respectively.•FeOOH-MnO2/Sepiolite and Fe2O3-MnO2/Diatomite exhibit good recycle As(V) adsorption performance.