DataSheet1_Strontium Ion Removal From Artificial Seawater Using a Combination of Adsorption With Biochar and Precipitation by Blowing CO2 Nanobubble With Neutralization.docx

While enjoying the convenience of nuclear energy development, the environmental contamination by radionuclide leakage is of significant concern. Because of its cost-effectiveness and environmental friendliness, biochar has attracted a lot of attention in the field of radioactive water treatment. Herein, a novel teak peel modified biochar (labeled as PMBN3) was prepared and applied to remove strontium from artificial seawater. The characterisation of the prepared PMBN3 showed it contains numerous oxygen-containing functional groups (i.e. carboxyl and hydroxyl groups), laminar morphology, mesoporous structure, large specific surface area. PMBN3 exhibited great advantages in Sr(II) adsorption, such as rapid adsorption kinetics ( 0.98. The calculated thermodynamic parameters indicate that strontium adsorption on biochar occurs exothermically and spontaneously. Furthermore, for efficient removal of Sr(II), CO2 nanobubbles were blown into artificial seawater to precipitate the interfering metal ions, and followed by the adsorption of PMBN3 towards residual metal ions with the removal rate of Sr(II) over 99.7%. Finally, mechanistic studies have shown that the strontium adsorption process by PMBN3 is a multiple adsorption mechanism consisting of ion exchange between H+ (from -OH and -COOH) and Sr(II), and weak intermolecular forces between Sr(II) and the PMBN3 adsorbent. This study creatively combines chemisorption and nanobubble precipitation for strontium removal, which provides great reference value and guidance for environmental remediation.

在享受核能发展带来的便利的同时，放射性核素泄漏所引起的环境污染引起了广泛关注。鉴于其成本效益和环境友好性，生物炭在放射性废水处理领域受到了广泛关注。本研究中，一种新型的柚皮改性生物炭（标记为PMBN3）被制备并应用于从人工海水中去除锶。对制备的PMBN3进行表征显示，其含有大量的含氧官能团（例如羧基和羟基），层状形态，介孔结构，大比表面积。PMBN3在Sr(II)吸附方面表现出显著优势，如快速的吸附动力学（0.98）。计算的热力学参数表明，锶在生物炭上的吸附过程是放热且自发的。此外，为了高效去除Sr(II)，向人工海水中吹入CO2纳米气泡以沉淀干扰金属离子，随后PMBN3吸附残余金属离子，锶的去除率超过99.7%。最后，机理研究表明，PMBN3对锶的吸附过程是一个由H+（来自-OH和-COOH）与Sr(II)之间的离子交换以及Sr(II)与PMBN3吸附剂之间的弱分子间作用力组成的多种吸附机制。本研究创新性地结合化学吸附和纳米气泡沉淀技术去除锶，为环境修复提供了宝贵的参考价值和指导。