| In the present work, willow bamboo based activated carbon (WAC) was prepared from a common phytoremediation material-willow bamboo. The physical and chemical properties of WACs prepared at different activation temperatures (400℃,450℃,500℃,550℃,600℃and650℃) and their abilities to remove pollutants were examined, the target pollutants were lead, nitrobenzene and carbon dioxide. In the meantime, the compositions and utilization potential of the pyrolysis gases and oils generated during the preparation of WACs were investigated.The results indicated that the specific surface areas of the prepared six WACs were all very high, with the highest value of1526m2/g, and the micropore was rich. Increasing the activation temperatures gradually decreased its specific surface area. The adsorption capacities for iodine, methylene blue, Pb2+, nitrobenzene and carbon dioxide of WACs were1122.25,415.50,9.20mg/g,4.21mmol/g and65.05mg/g, respectively.With the increase of activation temperature, the yields of WAC decreased, the yield of pyrolysis oils increased, while the yield of pyrolysis gas kept relatively stable.The primary components of pyrolysis gases were H2, CH4, CO, and CO2. High activation temperature was in favour of the production of H2and CH4, with the amount of CO2reduced and the total combustion heat of pyrolysis gases improved. The components of pyrolysis oils were very complex, which mainly contain heterocyclic, alkanes, alkenes, and organic acids, etc. The components of pyrolysis oils were significantly influenced by activation temperature, and the maximum combustion heat was obtained at the activation temperature of650℃. In summary, preparing activated carbon from willow bamboo can not only get high quality WAC, but also get byproduct with a high potential. Low activation temperature was in favour of the quality of the WACs, while high temperature would improve the utilization potential of the by-products. |
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