Highly efficient adsorption of aqueous iodine on polythiophene/α-manganese dioxide nanocomposites

Colloids and Surfaces C: Environmental Aspects Pub Date : 2023-08-26 DOI:10.1016/j.colsuc.2023.100017

Aakash Waghmare , Roshni Rathore , Archna Pandey , Vimlesh Chandra

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Abstract

The discharge of wastewater containing toxic and radioactive iodine into water leads to a negative impact on aquatic life, animals and humans. In this work, we synthesized Polythiophene (PTh) and Polythiophene/α-MnO₂ nanocomposite (PTh/α-MnO₂) by the chemical route and used them to remove iodine from aqueous solution. The surface morphology showed presence of rod-shaped α-MnO₂ with a size of 25–200 nm embedded in polythiophene. The interplaner distance was found to be 0.7 nm corresponds to the (211) plane. Specific surface area of PTh and PTh/α-MnO₂ nanocomposite was found to be 22.15 m²/g and 51.98 m²/g respectively and equilibrium I₂ adsorption capacity was found to be (q_e) 266.08 mg/g and 304.21 mg/g respectively. Langmuir isotherm (R² = 0.99) fitted well compared to Freundlich isotherm (R² = 0.84) indicates monolayer adsorption of iodine onto adsorbent surface. The adsorbent is stable, recyclable, high adsorption capacity, and environment friendly so it can be used at large scale for treatment of I₂ contaminated water.

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聚噻吩/α-二氧化锰纳米复合材料对水中碘的高效吸附

将含有有毒和放射性碘的废水排放到水中会对水生生物、动物和人类产生负面影响。本工作采用化学方法合成了聚噻吩（PTh）和聚噻吩/α-MnO2纳米复合材料（PTh/α-MnO_2），并用它们去除水溶液中的碘。表面形态显示，聚噻吩中存在尺寸为25–200 nm的棒状α-MnO2。发现晶面间距为0.7nm，对应于（211）面。PTh和PTh/α-MnO2纳米复合材料的比表面积分别为22.15m2/g和51.98m2/g，平衡I2吸附容量分别为（qe）266.08mg/g和304.21mg/g。Langmuir等温线（R2=0.99）与Freundlich等温线（R2=0.084）拟合良好，表明碘在吸附剂表面的单层吸附。该吸附剂稳定、可回收、吸附能力强、环境友好，可大规模用于I2污染水的处理。

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Colloids and Surfaces C: Environmental Aspects

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