Background

Management and separation of radioactive iodine from wastewater of nuclear power plants is time-dependent and needs lot of efforts. Changes of surface chemistry due to radioactive irradiations are the major issue for developing an efficient adsorbent for separation of radionuclei from wastewater.

Methods

This article presented a promising case of separation of non-radioactive iodine from aqueous solution using neem oil phenolic resin treated lignocellulosic biomass. The resin was prepared with some ingredients with known properties of radiation absorption.

Findings

The data pointed that the treated biomass has the efficacy of iodine separation from aqueous solution within wide range of pH. The iodine sorption followed the Langmuir isotherm indicating a monolayer surface adsorption reaction. The maximum iodine removal efficacy of the resin treated biomass was 3.64 mg/g. The iodine adsorption was found to follow the pseudo second order reaction. The kinetic analysis also indicated that both surface adsorption and intraparticle diffusion were likely to control the rate of iodine-adsorbent. The treated adsorbent also showed iodine removal efficacy in column mode. The resin used for the treatment of lignocellulosic biomass was prepared using cashew nut shell liquid and phenol-formaldehyde that are known for their radiation adsorption and antioxidant properties. Thus, neem oil cashew nut shell liquid containing phenol formaldehyde resin treated biomass is expected to be stable under radioactive radiation. As radioactive iodine generation is a common phenomenon for nuclear power plant the bio-based chemical modified lignocellulosic adsorbent could be a promising alternative. However, more detail investigations with radioactive iodine containing real wastewater from nuclear power plant is needed for validation of our statement.

中文翻译：

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使用印楝油-腰果壳液-酚醛树脂改性木质纤维素生物基质分离碘：批量和柱状研究

背景

核电厂废水中放射性碘的管理和分离是有时间依赖性的，需要付出很多努力。由于放射性辐射引起的表面化学变化是开发用于从废水中分离放射性核的有效吸附剂的主要问题。

方法

本文介绍了使用印楝油酚醛树脂处理的木质纤维素生物质从水溶液中分离非放射性碘的有希望的案例。该树脂是用一些具有已知辐射吸收特性的成分制备的。

发现

数据表明，经处理的生物质在较宽的 pH 值范围内具有从水溶液中分离碘的功效。碘吸附遵循朗缪尔等温线，表明单层表面吸附反应。树脂处理的生物质的最大碘去除效率为3.64mg/g。发现碘吸附遵循准二级反应。动力学分析还表明，表面吸附和颗粒内扩散都可能控制碘吸附剂的速率。经处理的吸附剂在柱模式下也显示出碘去除功效。用于处理木质纤维素生物质的树脂是使用腰果壳油和酚醛制备的，这些物质以其辐射吸附和抗氧化特性而闻名。因此，印楝油腰果壳液含有酚醛树脂处理的生物质有望在放射性辐射下稳定。由于放射性碘的产生是核电站的常见现象，因此生物基化学改性木质纤维素吸附剂可能是一种很有前途的替代品。然而，需要对核电厂实际废水中的放射性碘进行更详细的调查，以验证我们的声明。