表面改性及活化废骨炭对挥发性有机化合物的快速高效吸附。
Surface modified and activated waste bone char for rapid and efficient VOCs adsorption.
机构信息
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, China.
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, China.
出版信息
Chemosphere. 2020 Oct;256:127054. doi: 10.1016/j.chemosphere.2020.127054. Epub 2020 May 11.
In this work, very efficient VOCs adsorbent was developed from waste bovine bone. After pyrolysis at 450 °C, the bone char was treated by HPO for surface modification and activated by KCO respectively. The prepared materials were characterized by N adsorption isotherms, SEM, FT-IR, and XPS. Adsorption/desorption and regeneration behavior of VOCs were also studied. Results showed that HPO modification can effectively accelerate the adsorption process and after KCO activation, a new hierarchical pore structure was found with an ultrahigh total pore volume of 2.807 cm/g. The specific adsorption capacity for typical VOC reached ∼13.03 mmol/g which is much higher than literature data under the same condition. Static toluene adsorption test on the prepared activated bone-char revealed that the hierarchical structure has provided abundant adsorption sites and the adsorption behavior can be well described by the pseudo-second-order model. The dynamic/static adsorption ratio increased from 70.31% to 78.62% due to less mass transfer resistance by surface modification.
在这项工作中，我们从废牛骨中开发出了一种非常高效的 VOCs 吸附剂。在 450°C 下进行热解后，骨炭分别用 HPO 进行表面改性和 KCO 进行活化。通过 N 吸附等温线、SEM、FT-IR 和 XPS 对制备的材料进行了表征。还研究了 VOC 的吸附/解吸和再生行为。结果表明，HPO 改性可以有效地加速吸附过程，经过 KCO 活化后，发现了具有超高总孔体积 2.807 cm/g 的新分级孔结构。典型 VOC 的比吸附量达到约 13.03 mmol/g，在相同条件下高于文献数据。在制备的活化骨炭上进行的静态甲苯吸附测试表明，分级结构提供了丰富的吸附位点，吸附行为可以很好地用伪二阶模型来描述。由于表面改性减少了传质阻力，动态/静态吸附比从 70.31%增加到 78.62%。
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