掺杂型生物炭的制备及其吸附亚甲基蓝特性研究

采用颗粒活性炭掺杂生物质材料并在微波作用下制备了小麦秸秆（WH）微波生物炭和玉米秸秆（CB）微波生物炭,并用比表面积孔径分析仪、扫描电子显微镜和傅里叶变换红外光谱仪对其进行了表征,考察了微波生物炭对水中亚甲基蓝的吸附特性。实验结果表明：所制备的微波生物炭具有较大的比表面积和丰富的表面官能团,微波功率500 W制备的微波生物炭（WH500和CB500）比表面积最大（312.62~325.23 m²/g）;WH500和CB500对亚甲基蓝的吸附容量分别为111.77 mg/g和72.80 mg/g;Elovich吸附动力学和Langmuir等温线模型能更好地描述微波生物炭对亚甲基蓝的吸附行为,颗粒内扩散为主要控制步骤;在较高pH、离子浓度下,微波生物炭能更好地吸附亚甲基蓝。

Preparation of doped biochar and its adsorption property to methylene blue

The wheat straw（WH） microwave biochar and corn straw（CB） microwave biochar were prepared by using granular activated carbon doped biomass under microwave action and characterized by specific surface area aperture analyzer,scanning electron microscope and Fourier infrared spectrometer. The adsorption properties of microwave biochar to methylene blue （MB）in water were studied. The experiment results show that：The prepared microwave biochar has a large specific surface area and rich functional groups;The biochars produced under microwave power of 500 W（WH500 and CB500） has the maximum specific surface area of 312.62-325.23 m²/g;The adsorption capacity of WH500 and CB500 to MB is 111.77 mg/g and 72.80 mg/g,respectively;Both Elovich adsorption kinetics and Langmuir isotherm model can describe the adsorption behavior of microwave biochar to MB better,and intra-particle diffusion is the main control step;Under high pH and ion concentration,microwave biochar can absorb MB better.