Adsorptive removal of manganese and fluoride from wastewater by waste tire-derived activated carbon impregnated with iron and cobalt has been presented in this article. The surface properties of bimetallic activated carbon were characterized in scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), and X-ray diffraction (XRD). The newly developed adsorbent was used for simultaneous removal of fluoride and manganese from aqueous solution. Present work focuses on the optimization of process parameters using response surface method (RSM) technique employing significant parameters, namely, adsorbent dosage, initial fluoride and manganese concentrations, contact time and pH. Central composite design in RSM was utilized for the levels of adsorbent dosage (0.5–1 g/L), initial fluoride concentration (20–40 ppm), initial manganese concentration (30–50 ppm), time (15–35 min), and pH (4–8) of the solution. The R² value obtained from the statistics data was 96.25 and 97.57% for fluoride and manganese, respectively. The optimal values were determined as the adsorbent dosage of 1.25 g/L, initial fluoride concentration of 10 ppm, initial manganese concentration of 25.25 ppm, the contact time of 30.9 min and pH of solution of 2.0, under which 99.96% manganese and 85.34% fluoride removal efficiency could be accomplished.

中文翻译：

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废轮胎双金属浸渍活性炭同时吸附水溶液中锰和氟化物：响应面法建模方法

本文介绍了用铁和钴浸渍的废轮胎活性炭吸附去除废水中的锰和氟化物。双金属活性炭的表面性质通过扫描电子显微镜（SEM）、Brunauer-Emmett-Teller（BET）和X射线衍射（XRD）进行表征。新开发的吸附剂用于同时去除水溶液中的氟化物和锰。目前的工作重点是使用响应面法 (RSM) 技术优化工艺参数，该技术采用重要参数，即吸附剂剂量、初始氟化物和锰浓度、接触时间和 pH 值。RSM 中的中心复合设计用于吸附剂剂量 (0.5–1 g/L)、初始氟化物浓度 (20–40 ppm)、溶液的初始锰浓度 (30–50 ppm)、时间 (15–35 分钟) 和 pH (4–8)。这从统计数据中获得的R ²值分别为氟化物和锰的96.25%和97.57%。最佳值确定为吸附剂用量1.25 g/L，初始氟化物浓度10 ppm，初始锰浓度25.25 ppm，接触时间30.9 min，溶液pH 2.0，其中锰含量为99.96%，锰含量为85.34%可以达到除氟效率。