Effect of Physical and Chemical Activation on Arsenic Sorption Separation by Grape Seeds-Derived Biochar

Separations

Elena Diaz¹  Eduardo Moreno-Jimenéz²  Teresa Fresno²  Vladimír Frišták³ 

[1] Chemical Engineering Department, Faculty of Sciences, Universidad Autónoma de Madrid, 28049 Madrid, Spain;Department of Agricultural and Food Chemistry, Faculty of Sciences, Universidad Autónoma de Madrid, 28049 Madrid, Spain;Department of Chemistry, Faculty of Education, Trnava University in Trnava, 91843 Trnava, Slovak Republic;

关键词: arsenic;    separation;    biochar;    pyrolysis;    activation;   

DOI  :  10.3390/separations5040059

来源: DOAJ

【 摘 要 】

The utilization of carbon-rich pyrolysis materials in the separation processes of metalloids plays a crucial role in analytes pre-concentration techniques and opens a burning issue in new sorbents development. This study characterized the effect of physical and chemical activation with subsequent iron impregnation of grape seed-derived biochar on sorption removal of As from model aqueous solutions. Sorbents that were produced in slow pyrolysis process at 600 °C were characterized by SEM, elemental, and specific surface area analysis. Sorption separation of As by the studied materials was characterized as on contact time and an initial concentration dependent process reaching sorption equilibrium in 1440 min. Air activated biochar (A1GSBC) showed about 7.7 times and HNO₃ activated biochar (A2GSBC) about 6.8 times higher values of Q_max as compared to control (GSBC). A1GSBC and A2GSBC can be easily and effectively regenerated by alkali agent in several cycles. All of these results showed the practical use of the activation process to produce effective sorption materials with increased surface area and improved sorption potential for anionic forms separation from liquid wastes.

【 授权许可】

Unknown