水热法一步制备氮掺杂多孔碳及其吸附亚甲基蓝特性

One-step hydrothermal synthesis of nitrogen doped porous carbon and its adsorption properties for methylene blue

中文关键词: 花生壳  水热碳化  氮掺杂  吸附  亚甲基蓝

英文关键词: Peanut shell  Hydrothermal carbonization  Nitrogen doping  Adsorption  Methylene blue

中文摘要:

      为制备出廉价高效吸附剂，以花生壳作为碳源，氨水作为氮源，采用水热碳化法一步生成花生壳基氮掺杂水热炭。探究了水热反应温度（160、200、240℃）、水热反应时间（2、6、10 h）和氨水添加量（0、50、100、150、200 mL）对花生壳基氮掺杂水热炭吸附亚甲基蓝性能的影响。结果表明，在水热反应温度200℃，时间6 h，氨水添加量100 mL的条件下制备花生壳基氮掺杂水热炭（PSC200-6-100）对100 mg·L-1亚甲基蓝溶液吸附容量为39.403 mg·g-1，吸附率达到了98.861%，是相同吸附反应条件下未掺杂氮原子的水热炭吸附容量的2.824倍。花生壳基氮掺杂水热炭对亚甲基蓝的吸附更符合Lagergren准二级动力学模型，等温吸附模拟符合Langmuir等温吸附模型，吸附过程是受化学控制的单层吸附。

英文摘要:

      In order to prepare a cheap and efficient adsorbent, peanut shell based nitrogen doped hydrothermal carbon was generated in one step using hydrothermal carbonization method using peanut shell as carbon source and ammonia water as nitrogen source. A single factor experiment was conducted to investigate the effects of hydrothermal reaction temperature (160, 200, 240℃), hydrothermal reaction time (2, 6, 10 h), and ammonia addition amount (0, 50, 100, 150, 200 mL) on the adsorption performance of peanut shell based nitrogen doped hydrothermal carbon for methylene blue. The results showed that under the conditions of hydrothermal reaction temperature of 200℃, time of 6 h, and ammonia addition of 100 mL, peanut shell based nitrogen doped hydrothermal carbon (PSC200-6-100) was prepared. The adsorption capacity of the 100 mg · L-1 methylene blue solution was 39.403 mg · g-1, and the adsorption rate reached 98.861%, which is 2.824 times the adsorption capacity of the undoped nitrogen atom hydrothermal carbon under the same adsorption reaction conditions. The adsorption of methylene blue on peanut shell based nitrogen doped hydrothermal carbon is more in line with the Lagergren quasi second-order kinetic model, and the isothermal adsorption simulation is in line with the Langmuir isothermal adsorption model. The adsorption process is a chemically controlled monolayer adsorption.