Uranium Removal from Wastewater Using Mg(OH)2-Impregnated Activated Carbon

Water, Air, & Soil Pollution volume 230, Article number: 213 (2019) Cite this article

Abstract

Uranium wastewater treatment has been performed by adsorption method using Mg(OH)2-impregnated activated carbon. Research purposes are to determine (i) uptake capacity of the adsorption isotherm of uranium in Mg(OH)2-impregnated activated carbon, (ii) mathematical correlation of uranium (VI) adsorption rate, and (iii) effect of the impregnation ratio of adsorbent to uranium removal efficiency. Adsorbent was synthesized through several stages, i.e., pyrolysis of coconut shell (400 °C), chemical activation using NaOH, and impregnation process using varied solutions of MgCl2 (600 °C). The materials were characterized comprehensively using FTIR, BET, XRF, and XRD. The parameters studied in this research were adsorption temperature (T), average particle diameter of adsorbent (d), mass ratio of adsorbent to wastewater solution (r), and impregnation ratio of Mg(OH)2/activated carbon. The results shown that equilibrium data are well fitted with the Langmuir isotherm model with the maximum adsorption capacity about 85 mg/g at 303 K and dimensionless constant separation factor (RL) value about 0.7. The adsorption rate was increased by increasing the adsorption temperature, mass ratio of adsorbent to wastewater solution, and the decrease of particle diameter of adsorbent with mathematical equation of the uranium (VI) adsorption rate as:

$$ \ln \frac{C}{C_0}=-\left[85032.11\exp \left(-\frac{41981.03}{RT}\right){d}^{-0.2176}{r}^{0.1925}\right]{t}^2 $$

In addition, the results also shown that increasing the impregnation ratio from 0.3 to 1.0 can increase the uranium removal efficiency up to 67.3%.

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Funding

This work was totally funded by Ministry of Finance of the Republic of Indonesia through master scholarship of LPDP Indonesia. The authors gratefully acknowledge the funding.

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Affiliations

  1. Department of Chemical Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta, 55281, Indonesia

    Andri Saputra, Teguh Ariyanto & Hary Sulistyo

  2. Department of Nuclear Chemical Engineering, Polytechnic Institute of Nuclear Technology, Yogyakarta, 55281, Indonesia

    Andri Saputra & Deni Swantomo

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  1. Andri Saputra
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  2. Deni Swantomo
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  3. Teguh Ariyanto
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  4. Hary Sulistyo
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Correspondence to Hary Sulistyo.

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Saputra, A., Swantomo, D., Ariyanto, T. et al. Uranium Removal from Wastewater Using Mg(OH)2-Impregnated Activated Carbon. Water Air Soil Pollut 230, 213 (2019). https://doi.org/10.1007/s11270-019-4269-8

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Keywords

  • Activated carbon
  • Adsorption isotherm
  • Adsorption kinetics
  • Uranium wastewater