FeOOH-MnO2/Sepiolite and Fe2O3-MnO2/Diatomite: Highly efficient adsorbents for the removal of As(V)
Source abstract
Abstract
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-MnO 2/Sepiolite and Fe 2O 3-MnO 2 /Diatomite using the hydrothermal treatment method at 180 °C for 12 h with KMnO 4, MnCl 2, and FeCl 3 as metal source and urea as precipitating agent. The FeOOH-MnO 2 or Fe 2O 3-MnO 2 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 m 2/g for the supported FeOOH-MnO 2 and Fe 2O 3-MnO 2 samples, respectively). FeOOH-MnO 2/Sepiolite and Fe 2O 3-MnO 2/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-MnO 2/Sepiolite and Fe 2O 3-MnO 2/Diatomite obeyed the Freundlich and Langmuir isothermal adsorption models, respectively. Considering their simple synthesis processes and excellent adsorption performance, we are sure that FeOOH-MnO 2/Sepiolite and Fe 2O 3-MnO 2/Diatomite are promising adsorbents for arsenic removal from wastewater.
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Research context
OpenAlex topics: Arsenic contamination and mitigation · Adsorption and biosorption for pollutant removal · Environmental remediation with nanomaterials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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