Nano-Materials and Environmental Detection Laboratory, Institute of Intelligent Machines, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China; University of Science and Technology of China, Hefei 230026, China.
Nano-Materials and Environmental Detection Laboratory, Institute of Intelligent Machines, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
J Colloid Interface Sci. 2018 Feb 1;511:155-164. doi: 10.1016/j.jcis.2017.09.110. Epub 2017 Sep 30.
Increasing exposure to arsenic (As) contaminated ground water has become a global health hazard to humanity. Suitable adsorbent for As removal from water, especially for As(III) than As(V), is an urgent but still a challenging task. In this study, waste orange peel (OP) was modified with magnetic nanoparticles followed by calcination as a novel adsorbent and investigated for instantaneous oxidation and adsorption of As(III) from aqueous solutions. The batch adsorption experimental results showed that calcined magnetic orange peel composites (CMOPC) exhibited superior As(III) adsorption capacity (10.3mg/g) as compared to similar cost effective adsorbents due to its high surface area, large pore size and greater numbers of active sites on its surface. The adsorption equilibrium data obeyed Langmuir model, and kinetic data was well described by the pseudo-second-order model. The adsorption mechanisms for As(III) might be involved ligand exchange of the hydroxyl in CMOPC to form Fe-O-As(III), and partial As(III) oxidation to As(V) followed by instantaneous adsorption on surface of CMOPC. The developed adsorbent has also demonstrated good anti-interference ability to co-existing ions, admirable regeneration ability and pronounced capacity in treating simulated real As(III) contaminated water. This study revealed that waste orange peel, after simple treatment could be used as a potential adsorbent for As(III) from aqueous solutions.
水中砷（As）污染的增加已成为全球人类健康的危害。从水中去除砷的合适吸附剂，特别是对 As(III)而不是 As(V)，是一项紧迫但仍然具有挑战性的任务。在这项研究中，废橙皮（OP）经过磁性纳米粒子改性，然后煅烧，作为一种新型吸附剂，用于研究水中 As(III)的瞬时氧化和吸附。批量吸附实验结果表明，煅烧磁橙皮复合材料（CMOPC）表现出优异的 As(III)吸附能力（10.3mg/g），与类似的具有成本效益的吸附剂相比，这是由于其具有高比表面积、大孔径和更多的表面活性位。吸附平衡数据符合 Langmuir 模型，动力学数据很好地符合伪二阶模型。As(III)的吸附机制可能涉及 CMOPC 中羟基的配体交换，形成 Fe-O-As(III)，以及部分 As(III)氧化为 As(V)，然后立即吸附在 CMOPC 的表面。所开发的吸附剂还表现出对共存离子的良好抗干扰能力、令人钦佩的再生能力以及在处理模拟真实 As(III)污染水方面的显著能力。本研究表明，经过简单处理的废橙皮可用作从水溶液中去除 As(III)的潜在吸附剂。
