A low-cost Cr(III)-incorporated Zr(IV) bimetallic oxide (CZ) was synthesized by simple chemical precipitation method for removal of fluoride from contaminated water. The physicochemical properties of CZ before and after fluoride removal were established with several instrumental techniques such as TEM with elemental mapping, SEM with EDX, XRD, IR, XPS, zeta potential measurement, etc. Batch adsorption technique were carried out to understand the factors affecting fluoride adsorption, such as effects of initial pH, adsorbent dose, co-occurring ions, contact time, and temperature. The maximum adsorption capacity observed at pH between 5 and 7. The fluoride adsorption processes on CZ obeyed the pseudo-second-order rate equations and both Freundlich and DR isotherm models. The maximum adsorption capacity of 90.67 mg g-1 was obtained. The thermodynamic parameters ΔH0 (positive), ΔS0 (positive), and ΔG0 (negative) indicating the fluoride sorption system was endothermic, spontaneous, and feasible. The CZ also successfully used as fluoride adsorbent for real field contaminated water collected from the Machatora district, Bankura, West Bengal, India. Graphical abstract Schematic representation of CZ synthesis and its application for lab as well as field water purification purpose.

中文翻译：

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一锅法合成的结合有Cr（III）的Zr（IV）氧化物用于氟化物的修复：从实验室到现场的性能评估研究。

通过简单的化学沉淀法合成了一种低成本的掺有Cr（III）的Zr（IV）双金属氧化物（CZ），用于从污水中去除氟化物。利用几种仪器技术，如元素映射的TEM，EDX的SEM，XRD，IR，XPS，ζ电位测量等，确定了氟在去除氟之前和之后的CZ的理化性质。进行了批量吸附技术以了解影响因素氟化物吸附，例如初始pH，吸附剂剂量，共生离子，接触时间和温度的影响。在5到7之间的pH值下观察到最大吸附容量。CZ上的氟化物吸附过程遵循拟二级速率方程，并遵循Freundlich和DR等温线模型。获得的最大吸附容量为90.67 mg g-1。表示氟化物吸附系统的热力学参数ΔH0（正），ΔS0（正）和ΔG0（负）是吸热，自发且可行的。CZ还成功地用作从印度西孟加拉邦班库拉Machatora区收集的实际污染水的氟化物吸附剂。图形摘要CZ合成及其在实验室以及野外净水用途中的应用。