Franciski Mauro A, Peres Enrique C, Godinho Marcelo, Perondi Daniele, Foletto Edson L, Collazzo Gabriela C, Dotto Guilherme L
Chemical Engineering Department, Federal University of Santa Maria - UFSM, 1000, Roraima Avenue, 97105-900 Santa Maria, RS, Brazil.
Postgraduate Program in Engineering Processes and Technology, University of Caxias do Sul - UCS, 1130, Francisco Getúlio Vargas Street, 95070-560 Caxias do Sul, RS, Brazil.
Waste Manag. 2018 Aug;78:630-638. doi: 10.1016/j.wasman.2018.06.040. Epub 2018 Jun 23.
An alternative activated biochar was developed from barley malt bagasse (BMB) through pyrolysis followed by CO activation. The materials BMB, biochar and activated biochar (CO-biochar) were characterized and tested as adsorbents for the removal of methylene blue (MB) from aqueous solutions. Adsorption kinetics, equilibrium and thermodynamics were studied. It was found that BMB and biochar presented surface area values lower than 1 m g, while CO-biochar was a typical mesoporous material with surface area around 80 m g. As consequence, the adsorption potential for methylene blue was in the following order CO-biochar ≫ biochar > BMB. Adsorption kinetics of MB on CO-biochar followed the pseudo-second order model. Langmuir presented the best fit with the equilibrium adsorption isotherms. The maximum adsorption capacity was 161 mg g. MB adsorption on CO-biochar was spontaneous, favorable and exothermic. Pyrolysis followed by CO activation was a suitable route to produce an alternative mesoporous adsorbent from barley malt bagasse.
通过热解然后进行CO活化，从大麦麦芽渣（BMB）制备了一种替代活化生物炭。对BMB、生物炭和活化生物炭（CO-生物炭）材料进行了表征，并测试了它们作为从水溶液中去除亚甲基蓝（MB）的吸附剂的性能。研究了吸附动力学、平衡和热力学。结果发现，BMB和生物炭的表面积值低于1 m²/g，而CO-生物炭是一种典型的中孔材料，表面积约为80 m²/g。因此，亚甲基蓝的吸附潜力顺序为CO-生物炭≫生物炭>BMB。MB在CO-生物炭上的吸附动力学遵循准二级模型。Langmuir与平衡吸附等温线拟合得最好。最大吸附容量为161 mg/g。MB在CO-生物炭上的吸附是自发、有利且放热的。热解后进行CO活化是从大麦麦芽渣制备替代中孔吸附剂的合适途径。
