This research assessed the capacity for Cd²⁺ removal from water using canola meal-based adsorbents: canola meal chemically activated with 1 mol L^–1 NaOH and pyrolyzed for 1 h at 500 °C (CAC) and the second product obtained with a similar process but with a second pyrolysis at 750 °C in CO₂ flow (CAC-CO₂). The materials were characterized by their chemical composition and thermal stability and using Fourier transform infrared spectroscopy, pH at point of zero charge (pH_PZC) and scanning electron microscopy. Hydroxyl and carboxyl are the most likely surface functional groups responsible for adsorption.

中文翻译：

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用 NaOH 和 CO2 处理的双低菜粕衍生的活化生物炭作为去除 Cd 的有效工具

本研究评估了使用基于双低油菜籽粉的吸附剂从水中去除Cd ²⁺的能力：双低油菜籽粉用 1 mol L ^–1 NaOH化学活化并在 500 °C (CAC) 下热解 1 小时，然后使用类似的方法获得第二个产品过程，但在 CO ₂流 (CAC-CO ₂ ) 中在 750 °C 下进行第二次热解。这些材料的特征在于它们的化学成分和热稳定性，并使用傅里叶变换红外光谱、零电荷点的 pH 值 (pH _PZC ) 和扫描电子显微镜进行表征。羟基和羧基是最可能负责吸附的表面官能团。