Salt template synthesis of hierarchical porous carbon adsorbents for Congo red removal
2022
Wang, Zichen | Tang, Zhi | Xie, Xuedong | Xi, Meiqi | Zhao, Junfeng
Water-soluble salt was used as a template to fabricate a series of hierarchical porous carbon materials (HPCs). HPCs prepared with 4 g salt template and thermally treated at 700 °C (HPCs-4-700) presents a 3D honeycomb-like microstructure with a large specific surface area of 705.51 m² g⁻¹, and large pore volume of 1.73 cm³ g⁻¹. HPCs-4-700 adsorbent shows a fast adsorption rate and high capacity toward Congo red (CR) dye. It can be found that the adsorption process follows the pseudo-second-order kinetics and Langmuir isotherm models with a maximum capacity of 869.73 mg g⁻¹. Due to high performance and simple preparation process, HPCs-4-700 might be a promising candidate for the removal of CR in wastewater.
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