Application of aluminum-modified food waste biochar as adsorbent of fluoride in aqueous solutions and optimization of production using response surface methodology

被引:58
作者
Meilani, Vera [1 ]
Lee, Jae-In [2 ]
Kang, Jin-Kyu [3 ]
Lee, Chang-Gu [4 ]
Jeong, Sanghyun [5 ]
Park, Seong-Jik [6 ]
机构
[1] Hankyong Natl Univ, Dept Chem Engn, Anseong 17579, South Korea
[2] Hankyong Natl Univ, Dept Integrated Syst Engn, Anseong 17579, South Korea
[3] Seoul Natl Univ, Environm Funct Mat & Water Treatment Lab, Seoul 08826, South Korea
[4] Ajou Univ, Dept Environm & Safety Engn, Suwon 16499, South Korea
[5] Pusan Natl Univ, Environm Engn, Busan 46241, South Korea
[6] Hankyong Natl Univ, Dept Bioresources & Rural Syst Engn, Anseong 17579, South Korea
基金
新加坡国家研究基金会;
关键词
Food waste; Biochar; Aluminum; Fluoride removal; Response surface methodology; Adsorption; NATURAL ORGANIC-MATTER; MAGNETIC BIOCHAR; PYROLYSIS TEMPERATURE; DRINKING-WATER; METAL-IONS; REMOVAL; ADSORPTION; SORPTION; PHOSPHATE; BATCH;
D O I
10.1016/j.micromeso.2020.110764
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Adsorption of fluoride from aqueous solutions by aluminum-impregnated biochar derived from food waste (Al-FWB) was studied. The individual and interactive effects of various factors on fluoride adsorption, including pyrolysis temperature and time, and aluminum content, were investigated. The optimum conditions for the synthesis of Al-FWB, predicted through a Box-Behnken-based response surface methodology model, which were as follows: a temperature of 315 degrees C, time of 0.65 h (39 min), and an aluminum content of 5.89%. Batch experiments were conducted to assess the feasibility of using Al-FWB for fluoride removal, and its mechanism. The Langmuir isotherm model and pseudo-second-order kinetics proved to be the best fit for the equilibrium data, with a maximum adsorption capacity of 123.4 mg/g. Thermodynamic results revealed a spontaneous endothermic reaction for fluoride adsorption. The Al-FWB showed a superior removal efficiency (91.4%) in a wide pH range (5-11) due to its pH buffering capacity during the adsorption process. The influence of co-existing anions on the fluoride adsorption was as follows: PO43- > SO42- > HCO3- > NO3-. Therefore, Al-FWB can be used as an effective adsorbent to remove fluoride from aqueous solutions.
引用
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页数:11
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