We evaluated Mytilus coruscus shells (MCS) as an adsorbent for fluoride removal. Its removal efficiency was enhanced by thermal treatment and MCS at 800 °C (MCS-800) increased significantly its fluoride adsorption capacity from 0 to 12.28 mg/g. While raw MCS is mainly composed of calcium carbonate (CaCO₃), MCS-800 consisted of 56.9% of CaCO₃ and 43.1% of calcium hydroxide (Ca(OH)₂). The superior adsorption capacity of MCS-800 compared to untreated MCS can be also explained by its larger specific surface area and less negative charge after the thermal treatment. X-ray photoelectron spectroscopy and X-ray diffraction analysis revealed that the fluoride adsorption of MCS-800 occurred via the formation of calcium fluorite (CaF₂). Fluoride adsorption of MCS-800 approached equilibrium within 6 h and this kinetic adsorption was well-described by a pseudo-second-order model. The Langmuir model was suitable for describing the fluoride adsorption of MCS-800 under different initial concentrations. The maximum fluoride adsorption amount of MCS-800 was 82.93 mg/g, which was superior to those of other adsorbents derived from industrial byproducts. The enthalpy change of fluoride adsorption was 78.75 kJ/mol and the negative sign of free energy indicated that this phenomenon was spontaneous. The increase of pH from 3.0 to 11.0 slightly decreased the fluoride adsorption capacity of MCS-800. The adsorption was inhibited in the presence of anions and their impact increased with following trend: chloride < sulfate < carbonate < phosphate. The fluoride adsorption capacities of MCS-800 after washing with deionized water and 0.1 M NaOH were reduced by 31.5% and 57.4%, respectively.

我们评估了Mytilus coruscus贝壳（MCS）作为氟去除的吸附剂。通过热处理提高了其去除效率，MCS在800°C（MCS-800）下的氟化物吸附容量从0显着提高到12.28 mg / g。原始MCS主要由碳酸钙（CaCO ₃）组成，而MCS-800由56.9％的CaCO ₃和43.1％的氢氧化钙（Ca（OH）₂）组成。与未经处理的MCS相比，MCS-800的优异吸附能力还可以通过热处理后的比表面积更大和负电荷更少来解释。X射线光电子能谱和X射线衍射分析表明MCS-800的氟化物吸附是通过形成萤石（CaF）₂）。MCS-800的氟化物吸附在6 h内达到平衡，该动力学吸附通过拟二级模型很好地描述。Langmuir模型适用于描述不同初始浓度下MCS-800的氟化物吸附。MCS-800的最大氟吸附量为82.93 mg / g，优于其他工业副产物吸附剂。氟化物吸附的焓变为78.75 kJ / mol，自由能的负号表明该现象是自发的。pH从3.0升高到11.0会使MCS-800的氟吸附能力略有下降。在阴离子的存在下吸附被抑制，并且其影响随着以下趋势增加：氯<硫酸盐<碳酸盐<磷酸盐。