AI Article Synopsis
- This study focused on how different pyrolysis temperatures affect the formation of harmful polycyclic aromatic hydrocarbons (PAHs) in biochar made from spent coffee grounds (SCG) and how this biochar adsorbs tetracycline (TC) in water.
- Biochar produced at 500°C showed the lowest PAH levels and the best TC adsorption performance, especially at a pH of 7, while the presence of ions in saline water reduced its adsorption capacity.
- The main mechanisms for TC adsorption included electrostatic interactions, hydrogen bonding, and π-electron donor-acceptor interactions, indicating that SCG 500 is a safe, cost-effective, and efficient absorbent for removing tetracycline from water.
Article Abstract
The main objective of this study was to evaluate the effect of different pyrolysis temperatures on the formation of polycyclicaromatichydrocarbons (PAHs) in biochar originated spent coffee ground (SCG) and the tetracycline (TC) adsorption behavior of biochar in water. The results showed that biochar synthesized at 500 °C (SCG 500) contained low PAHs (600 µg kg) and the highest TC adsorption efficiency. In addition, the characteristics, influencing factors on TC adsorption, and the related mechanisms of SCG 500 were comprehensively investigated. The results showed that the highest efficiency was observed at pH of 7 and the presence of ions in salinity solution reduced the adsorption capacity of SCG 500. The electrostatic interaction, hydrogen bonding, and π-EDA were the major adsorption mechanisms. Safety PAHs level, low-cost, widely material sources and high TC removal capacity suggested that SCG 500 was a promising environmentally friendly effective absorbent.
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| http://dx.doi.org/10.1016/j.biortech.2019.03.096 | DOI Listing |
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