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Enhanced removal of Cd(II) from aqueous solution using CaCO3 nanoparticle modified sewage sludge biochar

机译：CaCO 3 纳米颗粒改性污泥生物炭增强水溶液中镉的去除

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Nanostructured CaCO3 modified sewage sludge biochar (CMSSB) was successfully fabricated for efficient removal of Cd(II) from aqueous solutions. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses indicated that the loaded CaCO3 mainly existed in the form of dispersive calcite nanoparticles, and the loading of calcite nanoparticles had a slight effect on the morphology of the sewage sludge biochar (SSB). The adsorption capacity of the obtained CMSSB for Cd(II) based on the Langmuir model is 36.5?mg g?1, which was nearly three times higher than that of the pristine SSB. The adsorption process can be well described by the Elovich model, and the initial adsorption rate of the CMSSB is faster than that of the SSB. The Cd(II) adsorption mechanism on the CMSSB involves ion-exchange and precipitation reactions between heavy metal ions and calcite nanoparticles and biochar. The present results suggested that the as-prepared CMSSB is an efficient and economic adsorbent for environmental heavy metal remediation.
机译：成功制备了纳米结构的CaCO 3 修饰的污水污泥生物炭（CMSSB），用于有效去除水溶液中的Cd（ II ）。 X射线衍射（XRD）和扫描电镜（SEM）分析表明，负载的CaCO 3 主要以分散方解石纳米颗粒的形式存在，方解石的负载量纳米颗粒对污水污泥生物炭（SSB）的形态影响很小。根据Langmuir模型，所得CMSSB对Cd（ II ）的吸附容量为36.5？mg g ？1 ，接近3比原始SSB高出十倍。吸附过程可以通过Elovich模型很好地描述，并且CMSSB的初始吸附速率比SSB的初始吸附速率快。 CMSSB上Cd（ II ）的吸附机理涉及重金属离子与方解石纳米粒子和生物炭之间的离子交换和沉淀反应。目前的结果表明，所制备的CMSSB是用于环境重金属修复的有效且经济的吸附剂。

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