一种改进的方法，用于在低温下增强香蕉假茎生物炭对亚甲基蓝的吸附能力。
A modified method for enhancing adsorption capability of banana pseudostem biochar towards methylene blue at low temperature.
机构信息
Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, College of Materials and Chemical Engineering, Hainan University, Haikou 570228, China.
Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, College of Materials and Chemical Engineering, Hainan University, Haikou 570228, China.
出版信息
Bioresour Technol. 2019 Jun;282:48-55. doi: 10.1016/j.biortech.2019.02.092. Epub 2019 Feb 21.
A phosphomolybdic acid promoted oxidative pyrolysis was described for preparation of banana pseudostem biochar. The strategy succeeded to introduce oxygen-containing groups onto the biochar surface at low temperature. In addition, pore channels were created, demonstrated by the SEM images of biochar prepared at 200 °C. Adsorption experiments showed that the biochar pyrolyzed at 200 °C exhibited much better adsorption capability than others pyrolyzed at higher temperatures for methylene blue (MB). The adsorption capability of biochar prepared at 200 °C was enhanced from 87.28 to 146.23 mg/g at 45 °C with phosphomolybdic acid modification. The enhancement of adsorption capacity could be ascribed to the increase of surface oxygen-containing functional groups and pore channels. In-situ generated carboxylic groups during adsorption and desorption played an important role in removal of MB. Adsorption of MB was mainly attributed to hydrogen bonding, electrostatic interactions and cation exchanges.
采用磷钼酸促进的氧化热解方法制备香蕉假茎生物炭。该策略成功地在低温下将含氧基团引入生物炭表面。此外，通过在 200°C 下制备的生物炭的 SEM 图像可以看出，形成了孔道。吸附实验表明，在 200°C 下热解的生物炭对亚甲基蓝（MB）的吸附能力优于在较高温度下热解的生物炭。在 45°C 下，经磷钼酸改性后，在 200°C 下制备的生物炭的吸附能力从 87.28 增加到 146.23mg/g。吸附容量的提高归因于表面含氧官能团和孔道的增加。吸附和解吸过程中原位生成的羧酸基团在去除 MB 方面发挥了重要作用。MB 的吸附主要归因于氢键、静电相互作用和阳离子交换。
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