In the current work, user-friendly, biodegradable, Zirconium-Lanthanum (ZLPC) and Zirconium-Cerium (ZCPC) complexed Polyvinyl alcohol (PVA) films were solvent casted for effective defluoridation of water. The films were characterised using SEM coupled EDS, XPS, TGA, XRD and FT-IR. These films adsorbed 95−97% fluoride from water at pH 7, with 85% removal by ZLPC and 93% removal by ZCPC within the first 45 minutes of the adsorption process. A maximum adsorption capacity of 11.57 mg/g and 12.88 mg/g, corresponding to ZLPC and ZCPC respectively, was obtained using Langmuir adsorption isotherm. The films followed pseudo-second-order kinetics (R²≤0.99) in both the cases, which was further established by low values of chi-square and root mean square error (RMSE). The ICP-AES analysis confirmed no leaching of the metal ions from the polymer films into the treated water. The films were found to be stable in both acidic and basic medium. No interference to fluoride adsorption was detected even at 100 mg/L of Cl⁻, NO₃⁻ and SO₄²⁻ while some interference was observed in the presence of PO₄³⁻ and HCO₃⁻. The change in Gibbs free energy for fluoride adsorption using the ab-initio method was found to be −330.05 kJ/mol, which indicated spontaneity of the process. This was further reinforced by the thermodynamic data obtained from adsorption studies. The films were reusable and showed ∼85% removal of fluoride even after the fifth regeneration cycle. Thus, these handy films have a scope to be developed into a prototype for defluoridation of ground water.

在当前的工作中，使用溶剂流延的方法铸造了用户友好，可生物降解的锆-镧（ZLPC）和锆-铈（ZCPC）复合聚乙烯醇（PVA）膜，以对水进行有效的脱氟。使用SEM耦合EDS，XPS，TGA，XRD和FT-IR对膜进行表征。这些薄膜在pH值为7的条件下从水中吸附了95-97％的氟化物，在吸附过程的前45分钟内，ZLPC除去了85％，ZCPC除去了93％。使用Langmuir吸附等温线获得的最大吸附容量分别为ZLPC和ZCPC的11.57 mg / g和12.88 mg / g。这些膜遵循伪二级动力学（R ²≤0.99），这是通过卡方和均方根误差（RMSE）较低的值进一步确定的。ICP-AES分析确认没有金属离子从聚合物薄膜浸出到处理过的水中。发现该膜在酸性和碱性介质中均稳定。氟化物吸附没有干扰，即使在100mg / L的氯的检测^-，NO ₃ ^-和SO ₄ ^2-而在PO的存在下观察到一些干扰₄ ^3-和HCO ₃ ^-。使用从头算方法吸附氟化物的吉布斯自由能的变化为-330.05 kJ / mol，表明该过程具有自发性。从吸附研究获得的热力学数据进一步证实了这一点。这些薄膜可重复使用，即使在第五次再生循环后仍显示出〜85％的氟化物去除率。因此，这些方便使用的薄膜具有发展成为地下水脱氟原型的范围。