Selective chemical adsorption of Cd(II) on silica covalently decorated with a β-ketoenol-thiophene-furan receptor,Molecular Systems Design & Engineering

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Selective chemical adsorption of Cd(II) on silica covalently decorated with a β-ketoenol-thiophene-furan receptor
Molecular Systems Design & Engineering ( IF 3.2 ) Pub Date : 2019-12-12 , DOI: 10.1039/c9me00140a
Said Tighadouini _{1,

2,

3,

4,

5} , Smaail Radi _{1,

2,

3,

4,

5} , Yann Garcia _{6,

7,

8,

9}

Affiliation

Nowadays, porous hybrid materials are considered as potential reservoirs of metallic species in environmental clean-up technologies. Herein, a new environment-friendly surface with thiophene-furan-β-ketoenol grafted on a colloidal silica surface has been synthesized with the purpose of using it as an effective and selective adsorbent for Cd(II) from aquatic environments. Elemental analysis, Fourier-transform infrared spectroscopy, scanning electronic microscopy, thermogravimetric analysis and Brunauer–Emmett–Teller analysis confirm the successful surface incorporation of the β-ketoenol bis-heterocycle receptor. The novel inorganic–organic hybrid material was applied for Cd(II), Cu(II), Zn(II) and Pb(II) adsorption. Cd(II) adsorption reaches 84.45 mg g⁻¹ within only 30 min at pH 6, and the adsorption was more appropriate with the 2nd order kinetic model (R² ≥ 0.997) and Langmuir model isotherm where the adsorption process is coherent with a monolayer adsorption reaction. The ΔH°, ΔS° and ΔG° parameters reflect spontaneous, and endothermic adsorption and that the process increases the randomness. The new material demonstrates its efficiency and selectivity towards Cd(II) and promises good reusability for at least five elimination cycles. The new material can be considered as a reliable cleaner of Cd(II) from aquatic environments.

中文翻译：

共价修饰了β-酮烯醇-噻吩-呋喃受体的二氧化硅对Cd（II）的选择性化学吸附

如今，在环境清洁技术中，多孔杂化材料被认为是潜在的金属物种库。在此，已经合成了一种新的环保表面，其表面接枝有噻吩-呋喃-β-酮烯醇，该表面被胶体二氧化硅表面用作其对水生环境中Cd（II）的有效和选择性吸附剂。元素分析，傅立叶变换红外光谱，扫描电子显微镜，热重分析和Brunauer-Emmett-Teller分析证实了β-酮烯醇双杂环受体的成功表面结合。新型无机-有机杂化材料应用于Cd（II），Cu（II），Zn（II）和Pb（II）吸附。镉（II）的吸附达到84.45毫克克^-1仅在30分钟内，在pH 6和吸附量为与第二级动力学模型（更合适的- [R ² ≥0.997）和Langmuir等温线模型，其中吸附过程是相干与单层吸附反应。该Δ ħ °，Δ小号°和Δ ģ °参数反映自发的，和吸热吸附并且该过程增加的随机性。这种新材料展示了其对Cd（II）的效率和选择性，并有望在至少五个消除周期内实现良好的可重复使用性。新材料可以被认为是Cd（II）的可靠清洁剂。）。

更新日期：2019-12-12

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