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首页> 外文期刊>Journal of environmental science and health, Part A. Toxic/hazardous substances & environmental engineering >Physically activated charcoal from waste and low-cost biomass: Adsorptive and porosity studies
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Physically activated charcoal from waste and low-cost biomass: Adsorptive and porosity studies

机译：来自废物和低成本生物质的物理活性炭：吸附和孔隙率研究

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Different plant raw materials (corn stalk, wheat straw, saw dust, corn cobs, broom grass and Sudan grass) were carbonized and secondary activated in the rotating kiln with the action of water vapor as activation agent under different temperatures and lasting times. Optimum carbonization parameters such as temperature and lasting time were found to be 750 degrees C and 45min, while optimal conditions for powdered activated carbon obtained by water vapor activation at a temperature of 1,000C and contact time of 120min were determined. All obtained activated carbons were distinctly macroporous with mercury intrusion total specific pore volume in the range from 2.04 to 4.86cm(3)/g for activated carbons originating from sawdust and broom grass, respectively. Activated carbon prepared from broom grass had the largest specific surface area of 1,190m(2)/g. Freundlich, Langmuir, Dubinin-Radushkevitch and Temkin adsorption isotherm models were applied for groundwater humic matter adsorption modeling. Broom grass-originated activated carbon was found to have excellent adsorption affinities toward natural organic matter with regard to the Langmuir model, with maximum adsorption capacity of 90.1mgTOC/g. The Freundlich isotherm was best fitted with the obtained experimental data. Adsorption experiment followed a physical process as can be seen from heat of sorption of 118.82J/mol estimated by the Temkin isotherm model, and mean free energy of 0.158kJ/mol estimated by the Dubinin-Radushkevitch isotherm model.
机译：在不同温度和持续时间下，在水蒸气的作用下，将不同的植物原料（玉米秸秆、麦秸、锯末、玉米芯、扫帚草和苏丹草）碳化并二次活化。温度和持续时间等最佳碳化参数为750°C和45min，确定了在1000°C温度和120min接触时间下水蒸气活化得到的粉状活性炭的最佳条件。所有制备的活性炭均具有明显的大孔性，来自锯末和扫帚草的活性炭的汞侵入总比孔体积分别在2.04至4.86cm（3）/g之间。以扫帚草为原料制备的活性炭比表面积最大，为1,190m（2）/g。 Freundlich、Langmuir、Dubinin-Radushkevitch和Temkin吸附等温线模型用于地下水腐殖质吸附模型。与Langmuir模型相比，扫帚草活性炭对天然有机物具有优异的吸附亲和力，最大吸附量为90.1mgTOC/g。Freundlich等温线与获得的实验数据拟合最好。吸附实验遵循物理过程，从Temkin等温线模型估计的吸附热为118.82J/mol，平均自由能为0.158kJ/mol 由 Dubinin-Radushkevitch 等温线模型估计。

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