دانلود رایگان مقاله انگلیسی بسته بندی پایدار از کربن فعال حاصل از زباله برای جذب دی اکسید کربن - الزویر 2018

ABSTRACT

Global greenhouse gases emissions have increased tremendously since 1950’s due to excessive burning of fossil fuel. The objective of this work is to develop and investigate packaging waste-derived activated carbon for carbon capture. Activated carbon was synthesized by carbonization of peanut-shaped packaging waste followed by chemical activation using KOH at a ratio of one to four. The activated carbon was characterized for it is textural properties using N2 adsorption at 77 K, and carbon dioxide adsorption isotherms at 273, 298 and 323 K. Non-Linear Density Functional Theory (NDLFT) was applied to carbon dioxide isotherm at 273 K to characterize narrow micropores and microporous structure of activated carbon. Field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) were used to investigate morphology and microstructure. TEM micrographs confirmed the existence of random micropores. We have also noticed that the textural properties were highly dependent on the concentration of the activating agent. Carbon dioxide adsorption on activated carbon materials has shown dependency on the volume of narrow micropores (less than 0.8 nm). The activated carbon materials have narrow micropore volume in a range of 0.155–0.292 cm3 , and BET surface area of 761–1383 m2 /g. Carbon activated with KOH ratio of three (WDC-03) has shown excellent CO2 uptake of 5.33 and 4.24 mmol/g at 273 and 298 K respectively. Moreover, it has also shown a high value for the isosteric heat of adsorption (29.8–14.3 KJ/mol) and selectivity of ∼16 over nitrogen.

5. Conclusion

In conclusion, we have demonstrated facile synthesis of highly microporous activated carbon with excellent carbon capture performance, using carbonization of highly abundant peanut shaped packaging waste followed by KOH activation and without application of template or nitrogen doping. The results show KOH activation has led to great improvement in textural properties. Activated carbon materials have considerably high BET surface area of 761–1383 m2 /g and total pore volume of 0.418–0.736 cm3 . The volume of narrow micropore, less than 0.8 nm, is greatly affected by the ratio of KOH in range of 1–3, and it drops with further increasing of KOH. The relationship between of narrow micropore volume and amount of adsorbed CO2 has shown good linear fit at different temperatures, which confirms that adsorption of CO2 mainly happens on narrow micropores. KOH carbon ratio of (3:1) corresponds to WDC-3 resulted in the highest narrow micropore volume and the best CO2 adsorption capacity with 5.3 and 4.2 mmol/g at 273 and 298 K respectively, which are among the best-reported values for carbon adsorbents derived from waste sources. Moreover, activated carbon material WDC-03 has high Isosteric heat of adsorption of (29.8–14.3KJ/mol). It has also shown excellent selectivity for CO2 over N2, with a value of ∼16. Hence, Packaging waste is promising potential source for production of activated carbon with excellent carbon capture performance.