Rice husk hydrochar prepared by hydrochloric acid assisted hydrothermal carbonization for levofloxacin removal in bioretention columns

作者：Luo, Yidan; Lan, Yuanwang; Liang, Shuzhen; Yu, Shuohan; Xue, Mingshan^*; Yin, Zuozhu; Shen, Fang-Fang; Li, Xibao; Hong, Zhen; Yan, Meiling; Xie, Chan; Gao, Bin

来源：Bioresource Technology, 2024, 393: 130105.

DOI：10.1016/j.biortech.2023.130105

• Acid treatment
• Adsorption mechanism
• Antibiotic
• Biomass
• Water treatment

Hydrochars are promising adsorbents in pollutant removal for water treatment. Herein, hydrochloric acid (HCl) co-hydrothermally treated hydrochars were prepared from rice husk biomass at 180 degrees C via a one-step hydrothermal method. Adsorption behaviors of levofloxacin (LVX) on hydrochars were evaluated. The specific surface area and pore volume of the hydrochar synthesized in 5 mol/L HCl (5H-HC) were almost 17 and 8 times of untreated hydrochar, respectively. The 5H-HC sample exhibited the highest LVX adsorption capability at room temperature (107 mg/g). Thermodynamic experimental results revealed that adsorption was a spontaneous endothermic process. Yan model provided the best description of the breakthrough behavior of LVX in bioretention column, indicating that the adsorption on the samples involved several rate-limiting factors including diffusion and mass transfer. The results show that facile HCl co-hydrothermal carbonization of waste biomass can produce novel hydrochars with high LVX adsorption ability.

• 单位
  南昌大学; 南昌航空大学