Removal of high fluoride contents from aqueous solutions by inexpensive, and biocompatible biosorbent is a main concern for human health. In the present study the efficacy of Rhizopus oryzae fungal biomass in removal of fluoride from aqueous solutions considering the effects of different parameters such as contact time (10–180 min), initial fluoride concentration (2–10 mg/L), and biosorbent dose (0.25–2 g/L) was studied in a batch system. The optimum condition for the maximum fluoride biosorption (90.5%) was obtained at 2 g/L biosorbent dose, 30 min contact time and 2 mg/L initial fluoride concentration. The Langmuir model (R² = 0.9844) fitted better than the other models and showed a homogeneous biosorption surface with the possibility of a monolayer biosorption of fluoride by biosorbent. The Langmuir maximum biosorption capacity of fluoride for R. oryzae was obtained at 1.16 mg/g. The biosorption kinetic was controlled by the pseudo-second-order (R² = 0.9999) model and based on the intra-particle diffusion model; the fluoride biosorption rate was not controlled only by the mechanisms of intra-particle diffusion. Consequently, the results showed that fungal biomass can be used as a suitable biosorbent for fluoride removal from aqueous solutions.

中文翻译：

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米根霉对水溶液中氟化物的生物吸附：等温线和动力学评价

通过廉价且生物相容的生物吸附剂从水溶液中去除高氟含量是人类健康的主要关注点。在本研究中，考虑到不同参数的影响，例如接触时间（10-180 分钟）、初始氟化物浓度（2-10 mg/L）和生物吸附剂剂量，米根霉真菌生物质从水溶液中去除氟化物的功效(0.25–2 g/L) 在批处理系统中进行了研究。在 2 g/L 生物吸附剂剂量、30 分钟接触时间和 2 mg/L 初始氟化物浓度下，获得了最大氟化物生物吸附 (90.5%) 的最佳条件。Langmuir 模型 ( R ² = 0.9844）比其他模型拟合得更好，并显示出均匀的生物吸附表面，生物吸附剂可能对氟化物进行单层生物吸附。氟化物对米菌的朗缪尔最大生物吸附容量为1.16 mg/g。生物吸附动力学由准二级（R ²  = 0.9999）模型和基于颗粒内扩散模型控制；氟化物的生物吸附速率不仅受颗粒内扩散机制的控制。因此，结果表明真菌生物质可用作从水溶液中去除氟化物的合适生物吸附剂。