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Removal of fluoride from fertilizer industry effluent using carbon nanotubes stabilized in chitosan sponge.
Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2020-01-10 , DOI: 10.1016/j.jhazmat.2020.122042
Lutiane N Affonso 1 , Jorge L Marques 1 , Valéria V C Lima 1 , Janaina O Gonçalves 1 , Sergiane C Barbosa 1 , Ednei G Primel 1 , Thiago A L Burgo 2 , Guilherme L Dotto 3 , Luiz A A Pinto 1 , Tito R S Cadaval 1
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Adsorption of fluoride from fertilizer industry effluent using carbon nanotubes stabilized in chitosan sponge as adsorbent was evaluated. The effluent was produced in the washing of acid gases during the reaction in fertilizer production and all assays were performed using this hazardous material. Adsorbent characterization and ions interactions were elucidated from differential scanning calorimetry, thermal gravimetric analyses, X-ray diffraction, scanning electron microscopy dispersive energy X-ray spectroscopy, atomic force microscopy and X-ray photoelectron spectroscopy. The effluent presented pH 3 and its value not changed in the adsorption assays, maintaining the conditions of the process. The kinetics assays of fluoride from industry effluent were performed in different stirring rates from 100 to 300 rpm. It was observed that adsorption was initially fast reaching the equilibrium at 300 rpm in 20 min. The adsorption capacity was around 975.4 mg g-1, showing the potential of the hybrid material to remove fluoride from a real matrix. The high adsorption capacity was attributed to the chitosan functional groups and the high interaction area promoted by sponge form and the carbon nanotube. Reuse and regeneration of the CNT-CS were investigated and 5 cycles were obtained. The adsorption capacity kept similar values in all cycles.

中文翻译:

使用壳聚糖海绵中稳定的碳纳米管从化肥工业废水中去除氟化物。

使用在壳聚糖海绵中稳定的碳纳米管作为吸附剂,评估了肥料工业废水中氟化物的吸附。在肥料生产过程中的反应过程中,酸性气体的洗涤产生了废水,所有测定均使用该有害物质进行。通过差示扫描量热法,热重分析,X射线衍射,扫描电子显微镜,色散能量X射线光谱,原子力显微镜和X射线光电子能谱阐明了吸附剂的特性和离子的相互作用。流出物的pH值为3,在吸附测定中其值保持不变,从而保持了工艺条件。在100至300 rpm的不同搅拌速率下进行了工业废水中氟化物的动力学分析。观察到吸附最初在20分钟内以300 rpm快速达到平衡。吸附容量约为975.4 mg g-1,显示了杂化材料从真实基质中除去氟化物的潜力。高吸附能力归因于壳聚糖官能团以及海绵形式和碳纳米管促进的高相互作用面积。研究了CNT-CS的重复使用和再生,并获得了5个循环。在所有循环中,吸附容量均保持相似的值。高吸附能力归因于壳聚糖官能团以及海绵形式和碳纳米管促进的高相互作用面积。研究了CNT-CS的重复使用和再生,并获得了5个循环。在所有循环中,吸附容量保持相似的值。高吸附能力归因于壳聚糖官能团以及海绵形式和碳纳米管促进的高相互作用面积。研究了CNT-CS的重复使用和再生,并获得了5个循环。在所有循环中,吸附容量均保持相似的值。
更新日期:2020-01-11
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