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Application of Waste-Derived Activated Red Mud/Base Treated Rice Husk Composite in Sulfate Adsorption from Aqueous Solution

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Abstract

In this study, the adsorption of sulfate ion on a novel composite containing industrial (red mud) and agricultural wastes (rise husk), prepared using a one-step hydrothermal process, has been investigated in a batch system by the OFAT method. The properties of the absorbent were analyzed using scanning electron microscope (SEM), BET surface area, FT-IR spectrum, and XRF. Pre-treatment and composite preparation processes led to morphological enhancement of adsorbent. The optimum adsorption conditions were determined as equilibrium time of 90 min, initial concentration of 100 ppm, pH = 4, temperature of 65 °C, and 7.5 g L−1 dose of the absorbent. The efficiency of sulfate removal was 93.1% at the optimum conditions. Thermodynamic analysis of adsorption showed that the adsorption process at all analyzed temperatures was °Ccurred spontaneously. Sulfate adsorption kinetics onto composite surfaces followed a pseudo-second-order equation and adsorption isotherm had high conformity with Langmuir isotherm (r = 0.994) and the maximum Langmuir adsorption capacity was determined as 13.07 mg of sulfate per gram of the absorbent. Loaded composite particles had shown stability in a wide range of pHs.

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Data availability

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Notes

  1. Red Mud.

  2. Activated Red Mud.

  3. Rice Husk.

  4. Base-treated Rice Husk.

  5. Base treated Rice Husk-Activated Red Mud.

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Authors

Contributions

All authors contributed to the study conception and design. Supervision: HG and BA. Material preparation, data collection and analysis were performed by principal author: AAD. The first draft of the manuscript was written by AArD and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Hossein Ganjidoust.

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The authors declare that they have no competing interests or personal relationships that could have appeared to influence the work reported in this paper.

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Dolatabad, A.A., Ganjidoust, H. & Ayati, B. Application of Waste-Derived Activated Red Mud/Base Treated Rice Husk Composite in Sulfate Adsorption from Aqueous Solution. Int J Environ Res 16, 2 (2022). https://doi.org/10.1007/s41742-021-00381-7

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  • DOI: https://doi.org/10.1007/s41742-021-00381-7

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