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A new approach to obtain mesoporous-activated carbon via hydrothermal carbonization of Brazilian Cerrado biomass combined with physical activation for bisphenol-A removal

2019; Taylor & Francis; Volume: 206; Issue: 11 Linguagem: Inglês

10.1080/00986445.2019.1601625

1563-5201

Romário Victor Pacheco Antero, Andreia Cristina Fonseca Alves, Paulo de Tarso Ferreira Sales, Sérgio Botelho de Oliveira, Satu Ojala, Sarah Silva Brum,

Effects and risks of endocrine disrupting chemicals

The worrying hydric crisis and the increasing water contamination by emerging pollutants around the world stimulate the development of activated carbons (AC) for the removal of endocrine disruptors, including bisphenol-A (BPA). For this reason, a new approach for the synthesis of AC from hydrochar produced through hydrothermal carbonization (HTC) of Brazilian Cerrado biomass (Magonia pubescens–Sapindaceae) and physical activation using water vapor is highlighted. Compared to the traditional method of physical activation after pyrolysis, HTC was found to be better option to develop the specific surface area, porosity, and yield of the ACs, which presented mesoporous structure and carbon content higher than 80%. The BPA adsorption was evaluated by varying the contact time, BPA concentration, and pH. The Langmuir, Freundlich, and Redlich–Peterson isotherms were used to model the adsorption behavior. In the preliminary test to verify the adsorption efficiency, the AC obtained from hydrochar treated at 180 °C presented better results compared to commercial AC. The BPA adsorption data of the best treated hydrochar correlated well with the pseudo first-order model and the Langmuir isotherm (Qmax = 21.26 mg g−1). The results of the studies indicated the combination of HTC and physical activation with steam to be an efficient way to prepare an ecologically sound adsorbent for removal of Bisphenol-A from water with lower temperature and without chemical reagents. The ACs obtained can also be potential materials for other applications, such as in the field of catalysis and environmental remediation.