Key Laboratory of Food Deep Processing Technology of Animal Protein of Zhejiang Province, College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, Zhejiang, PR China.
Zhejiang Marine Development Research Institute, Zhoushan, Zhejiang, PR China.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2023;58(8):725-737. doi: 10.1080/10934529.2023.2213393. Epub 2023 May 21.
Biochar was derived from Eucheuma (EBC) at a temperature of 500 °C and the resulting biochar was modified using NaOH, KOH, NaOH + KOH and HNO + HCl. This study investigated the impact of these modifications on the characteristics of the biochar and its effectiveness in adsorbing phenanthrene (Phe) from an aqueous solution. The results indicated that the surface roughness increased, leading to an increase in the specific surface area, and the development of complex pore structure, leading to a decrease in the polarity and increase in hydrophobicity of biochar modified by a mixture of KOH and HNO + HCl (EBC-K and EBC-H). The EBC-K and EBC-H samples exhibited superior surface areas (272.76 and 289.60 m g) and adsorption capabilities for Phe (removal rates of 99.8% and 99.4%). The pseudo-first order, pseudo-second order and intraparticle diffusion Kinetic model demonstrated that the adsorption process is determined by both physicochemical and intra-particle diffusion. The adsorption process was well described by the Langmuir model. The maximum adsorption capacity of EBC-K and EBC-H was increased by approximately 2.4 times compared with the original biochar. Batch adsorption experiments indicated that the removal rate increases with the increase of dosage. Additionally, EBC-H regenerated from -hexane removed 85.52% of the Phe solution.
生物炭是由麒麟菜（EBC）在 500°C 的温度下制备的，并用 NaOH、KOH、NaOH+KOH 和 HNO+HCl 对所得生物炭进行改性。本研究考察了这些改性对生物炭特性及其从水溶液中吸附菲（Phe）的有效性的影响。结果表明，表面粗糙度增加，导致比表面积增加，复杂孔结构的发展，导致极性降低和疏水性增加，由 KOH 和 HNO+HCl 混合物改性的生物炭（EBC-K 和 EBC-H）。EBC-K 和 EBC-H 样品表现出较高的比表面积（272.76 和 289.60 m g）和对 Phe 的吸附能力（去除率为 99.8%和 99.4%）。准一级、准二级和内扩散动力学模型表明，吸附过程受物理化学和内扩散的共同控制。吸附过程很好地符合朗缪尔模型。与原始生物炭相比，EBC-K 和 EBC-H 的最大吸附容量增加了约 2.4 倍。批量吸附实验表明，去除率随剂量的增加而增加。此外，用正己烷再生的 EBC-H 可去除 85.52%的 Phe 溶液。
