六价铬
吸附
活性炭
水溶液
朗缪尔吸附模型
铬
Box-Behnken设计
化学吸附
化学
响应面法
无机化学
材料科学
化学工程
核化学
色谱法
有机化学
工程类
作者
Mikiyas Abewaa,Andualem Arka,Tigabu Haddis,Ashagrie Mengistu,Temesgen Takele,Eba Adino,Yordanos Abay,Naol Bekele,Getaneh Andualem,Haftom Girmay
标识
DOI:10.1016/j.rineng.2024.102274
摘要
The indiscriminate release of chromium-saturated effluent into water bodies has raised concerns regarding its effect on human health and environmental ecology. Therefore, this research aimed to remove hexavalent chromium from an aqueous solution utilizing activated carbon developed from Rumex abyssinicus. The adsorbent was prepared through chemical impregnation with H3PO4 and then thermally activated at 500 for 2 h. The optimization of the adsorption experiments was performed using the Box‒Behnken approach of response surface methodology. The characterization of the prepared activated carbon revealed good quality in terms of its amorphous structure, maximum specific surface area of 1722.9 m2/g and porous surface. Furthermore, the optimization results showed that a maximum removal efficiency of 95.97% was attained at an optimum working pH of 3, a contact time of 60 min, an initial chromium concentration of 70 mg/L and an adsorbent dosage of 0.6 mg/100 mL. The Langmuir isotherm model was found to have the best fit with the experimental data. Moreover, the kinetics study revealed that a pseudo-second-order model fit the data best, indicating the occurrence of chemisorption. Overall, this study suggested that Rumex abyssinicus could be an effective adsorbent for removing hexavalent chromium from aqueous solutions.
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