Abstract Rhodamine chromophore was introduced into a chitosan based adsorbent developing for Hg (II) detection and removal in aqueous solution. The adsorbent displayed highly sensitive and selective fluorimetric and colorimetric response to Hg (II) with barely interference with more than ten kinds of competitive metal ions. The adsorbent exhibited strong orange fluorescence emission while encountering Hg (II) with the colour turning to red immediately and could be easily detected by naked eyes. In addition, the detection limit of the adsorbent was calculated to be 8.24 × 10−7 M, and the adsorption capacity was as high as 139.08 mg/g according to the batch adsorption experiments. Furthermore, the interaction between adsorbent and Hg (II) was verified to fit well with Langmuir isotherm model and the pseudo-second-order kinetic model. Thermodynamic studies demonstrated that lower temperature was benefit for the adsorption.

中文翻译：

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一种基于壳聚糖的新型吸附剂对水溶液中汞去离子的显着荧光响应和比色感

摘要 将罗丹明发色团引入壳聚糖基吸附剂中，开发用于水溶液中 Hg (II) 的检测和去除。该吸附剂对 Hg (II) 显示出高度灵敏和选择性的荧光和比色响应，几乎不干扰十多种竞争性金属离子。吸附剂在遇到Hg(II)时呈现强烈的橙色荧光发射，颜色立即变为红色，肉眼很容易检测到。此外，根据批量吸附实验计算出吸附剂的检测限为8.24×10-7 M，吸附容量高达139.08 mg/g。此外，吸附剂与 Hg (II) 之间的相互作用经验证与朗缪尔等温线模型和伪二级动力学模型非常吻合。