In this study, a new process for the recovery of fluoride from water with orange-waste gel loaded with Zr(IV) is investigated using saturated Ca(OH)₂ as the desorption agent to desorb fluoride from a fluoride-loaded adsorbent. The maximum adsorption capacities of Zr(IV)-loaded orange-waste gel at pH values of 2.5, 3, 4, 6, and 8 were found to be 1.23, 1.52, 1.74, 1.10, and 0.53 mmol/g, respectively. The white precipitate obtained after the desorption using saturated Ca(OH)₂ solution was characterized by scanning electron microscopy, X-ray diffraction, and dynamic light scattering techniques. The leakage of the total organic carbon during the desorption using Ca(OH)₂ (7.31 mg/L) was found to be considerably less than that using NaOH (71.48 mg/L) at a solid/liquid ratio of 5 g/L. It is considered that fluoride was first desorbed by the saturated Ca(OH)₂ solution, after which it combined with the Ca(II) ions provided by lime water to form a CaF₂ precipitate, which is a raw material employed in various industrial processes, including cement manufacturing. Therefore, the saturated Ca(OH)₂ solution investigated in this study can be considered as an efficient, economically viable, and promising desorbent for the removal of fluoride from fluoride-loaded adsorbents in an aqueous solution.

在这项研究中，使用饱和的Ca（OH）₂作为脱附剂，从载有氟化物的吸附剂中解吸氟化物，研究了一种负载Zr（IV）的橙色废物凝胶从水中回收氟化物的新方法。发现在pH值为2.5、3、4、6和8的情况下，负载Zr（IV）的橙色废物凝胶的最大吸附容量分别为1.23、1.52、1.74、1.10和0.53 mmol / g。使用扫描电镜，X射线衍射和动态光散射技术对使用饱和Ca（OH）₂溶液解吸后获得的白色沉淀物进行表征。Ca（OH）₂脱附过程中总有机碳的泄漏固/液比为5 g / L时，发现（7.31 mg / L）的浓度明显低于使用NaOH（71.48 mg / L）的浓度。认为氟化物首先被饱和的Ca（OH）₂溶液解吸，然后与石灰水提供的Ca（II）离子结合形成CaF ₂沉淀，CaF ₂沉淀是各种工业过程中使用的原料。 ，包括水泥制造。因此，在这项研究中研究的饱和Ca（OH）₂溶液可以被认为是一种有效的，经济上可行的且有前途的解吸剂，用于从水溶液中负载氟的吸附剂中除去氟。