Synthesis of a novel three-dimensional porous carbon material and its highly selective Cr(VI) removal in wastewater

Cr(VI) in water severely affects human health. In this study, a kind of novel 3D porous carbon material (3D-PCM) was prepared using glucose and urea via two-stage-hydrothermal and activation method for Cr(VI) removal in wastewater. The SEM demonstrate that 3D-PCM has a developed pore structure, and BET test shows that its specific surface area reaches 1554.77 m(2)/g. Batch adsorption experiments showed that the best pH is about 2.0 The Cr(VI) adsorption process on 3D-PCM follows pseudo-second-order kinetics and Freundlich model, and the maximum adsorption capacity reaches 837.19-951.65 mg/g (25-45 degrees C), which is higher than those of similar adsorbents in the world. Through the combination of chemical characterization and adsorption model analysis indicate that the main adsorption mechanisms on 3D-PCM include electrostatic interactions, ion complexation, physical adsorption, reduction and hydrogen bonding. Moreover, the multi-ion competitive simulation and adsorption and regeneration experiments showed that 3D-PCM has excellent selectivity and regenerative performance for Cr(VI) adsorption. Economic analysis shows that the manufacturing cost of 3D-PCM is low. Therefore, 3D-PCM is an effective and reusable material for Cr(VI) removal, and its preparation method is green and sustainable, which is expected to improve the problem of Cr(VI) pollution in water. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

A novel 3D porous carbon material was prepared for the removal of Cr(VI) pollution in water, with analysis showing its superior adsorption capacity and mechanisms. The material showed excellent selectivity and regenerative performance, with low manufacturing cost, making it an effective and sustainable solution for Cr(VI) removal.