Abstract In the present study, chitosan functionalized mesoporous silica nanoparticles have been synthesized. Chitosan derived from an edible mushroom, Agaricus bisporus was used during synthesis of chitosan functionalized silica nanoparticles. The functionalized silica nanoparticles were subjected to fluoride sorption using a batch method which subsequently showed removal efficiency of 95% with maximum sorption capacity, 58.8 mg/g. The characterization of nanoparticles was carried out by SEM, EDAX, XRD and FTIR analysis respectively. EDAX analysis suggested that oxygen, 51.83% and silica 37.24% was main constituent of the functionalized nanomaterials. XRD yielded characteristic diffraction pattern corresponding to the lattice planes (100), (110), (112), (120), (200) and (220) respectively. Sorption data was used to study equilibrium isotherm namely Langmuir and Freundlich model. The adsorption capacity increased with temperature while kinetics studies revealed that the adsorption process followed a pseudo-second-order rate equation. The enthalpy change (ΔH) and entropy change (ΔS) was found to be −31.36 kJmol−1 and −7.75 Jmol−1 K−1, showing endothermic and spontaneous nature of the fluoride adsorption. Data suggested that the nature of adsorption belonged to chemisorptions. The overall results suggested that the synthesized nanoparticles showed strong and specific affinity for fluoride and could be excellent adsorbents for defluoridation. Graphical Abstract

中文翻译：

---

蘑菇衍生壳聚糖功能化介孔二氧化硅纳米粒子去除水溶液中的氟化物

摘要 本研究合成了壳聚糖功能化介孔二氧化硅纳米粒子。在壳聚糖功能化二氧化硅纳米粒子的合成过程中使用了源自可食用蘑菇双孢蘑菇的壳聚糖。使用分批方法对官能化二氧化硅纳米粒子进行氟化物吸附，随后显示去除效率为 95%，最大吸附容量为 58.8 mg/g。分别通过SEM、EDAX、XRD和FTIR分析对纳米颗粒进行表征。EDAX 分析表明，51.83% 的氧和 37.24% 的二氧化硅是功能化纳米材料的主要成分。XRD产生分别对应于(100)、(110)、(112)、(120)、(200)和(220)晶面的特征衍射图。吸附数据用于研究平衡等温线，即 Langmuir 和 Freundlich 模型。吸附容量随温度增加而增加，而动力学研究表明吸附过程遵循准二级速率方程。发现焓变（ΔH）和熵变（ΔS）为-31.36 kJmol-1和-7.75 Jmol-1 K-1，表明氟化物吸附具有吸热和自发性质。数据表明吸附的性质属于化学吸附。总体结果表明，合成的纳米粒子对氟化物表现出很强的特异性亲和力，可以作为除氟的优良吸附剂。图形概要 吸附容量随温度增加而增加，而动力学研究表明吸附过程遵循准二级速率方程。发现焓变（ΔH）和熵变（ΔS）为-31.36 kJmol-1和-7.75 Jmol-1 K-1，表明氟化物吸附具有吸热和自发性质。数据表明吸附的性质属于化学吸附。总体结果表明，合成的纳米粒子对氟化物表现出很强的特异性亲和力，可以作为除氟的优良吸附剂。图形概要 吸附容量随温度增加而增加，而动力学研究表明吸附过程遵循准二级速率方程。发现焓变（ΔH）和熵变（ΔS）为-31.36 kJmol-1和-7.75 Jmol-1 K-1，表明氟化物吸附具有吸热和自发性质。数据表明吸附的性质属于化学吸附。总体结果表明，合成的纳米粒子对氟化物表现出很强的特异性亲和力，可以作为除氟的优良吸附剂。图形概要 总体结果表明，合成的纳米粒子对氟化物表现出很强的特异性亲和力，可以作为除氟的优良吸附剂。图形概要 总体结果表明，合成的纳米粒子对氟化物表现出很强的特异性亲和力，可以作为除氟的优良吸附剂。图形概要