Department of Chemical Engineering, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Brazil.
Environ Technol. 2021 Nov;42(26):4189-4200. doi: 10.1080/09593330.2020.1746839. Epub 2020 Mar 31.
The regeneration of diclofenac saturated activated carbon was studied and compared by thermal, solvent and ultrasound techniques in this work. Thermal regeneration was performed at 673 K in atmospheric air for one hour. Different proportions of solvents (ethanol, ethyl acetate and HO) were used to evaluate the regeneration of the sorbent solid. Ultrasound treatment was tested by varying the time (5 and 15 min) and bath temperature (298 and 323 K). With the highest levels of regeneration for each technique employed, regeneration cycle tests were conducted. With the adsorption capacity recovery limit set at 60%, 8 regeneration cycles were achieved. At the end of the 8th regeneration cycle, the thermal technique made it possible to maintain the adsorption capacity at 75%. Using the water/ethanol (50:50) solvent mixture, after 8 cycles, 64% of solid regeneration was obtained. With the ultrasound technique, in the 5th cycle the solid regeneration capacity was reduced to 65%, remaining constant until 8°. The sorbent solid was characterized by TGA, N adsorption, FTIR and sem.
本工作研究并比较了热解、溶剂和超声技术对二氯芬酸饱和活性炭的再生。热解在大气空气中于 673 K 下进行 1 小时。使用不同比例的溶剂（乙醇、乙酸乙酯和水）来评估吸附剂固体的再生。通过改变时间（5 和 15 min）和浴温（298 和 323 K）测试了超声处理。对于每种技术，都进行了再生循环测试，采用最高的再生水平。在吸附容量回收率设定为 60%的情况下，实现了 8 个再生循环。在第 8 个再生循环结束时，热解技术可将吸附容量保持在 75%。使用水/乙醇（50:50）溶剂混合物，经过 8 个周期，可实现 64%的固体再生。在超声技术中，第 5 个周期的固体再生能力降低至 65%，直到第 8 个周期保持不变。通过 TGA、N 吸附、FTIR 和 SEM 对吸附剂进行了表征。
