da Paixão Cansado Isabel Pestana, Mourão Paulo Alexandre Mira, Belo Cristóvão Ramiro
MED-Mediterranean Institute for Agriculture, Environment and Development & Change-Global Change and Sustainability Institute, Departamento de Química e Bioquímica, Escola de Ciências e Tecnologia, Universidade de Évora, Rua Romão Ramalho nº 59, 7000-671 Évora, Portugal.
LAQV-Requimte, Departamento de Química e Bioquímica, ECT, IIFA, Universidade de Évora, Rua Romão Ramalho nº 59, 7000-671 Évora, Portugal.
Materials (Basel). 2022 Aug 24;15(17):5842. doi: 10.3390/ma15175842.
This work presents a first approach concerning the valorization of Tectona Grandis tree by-products, from East Timor through their transformation into high activated carbon (AC) by chemical activation with KOH and KCO. The better ACs, Teak-KOH-1-1-700 and Teak-KCO-1-2-700, presented a high A (995 and 1132 m·g) and micropore volume (0.43 and 0.5 cm·g), respectively. Both ACs were tested on the removal of four pesticides, from the liquid phase. Both ACs performed better than existing commercial types, presenting a maximum adsorption capacity of 1.88, 1.67, 1.10 and 0.89 mmol·g, for 4-chloro-2-methylphenoxyacetic acid, 2,4-dichlorophenoxyacetic acid, diuron and atrazine, respectively. Pesticide adsorption from diluted and concentrated solutions confirms that diffusion is the limiting factor. The possibility of implementing a production unit for ACs in East Timor is very promising for that country. It presents an opportunity for job creation, biomass waste reduction and a contribution to environmental sustainability, thereby following the principles of a circular economy.
这项工作首次探讨了东帝汶柚木树副产物的价值提升途径，即通过用氢氧化钾（KOH）和碳酸钾（KCO）进行化学活化将其转化为高活性碳（AC）。性能较好的活性炭Teak-KOH-1-1-700和Teak-KCO-1-2-700的比表面积分别高达995和1132 m²·g，微孔体积分别为0.43和0.5 cm³·g。对这两种活性炭进行了从液相中去除四种农药的测试。两种活性炭的性能均优于现有的商业类型，对4-氯-2-甲基苯氧基乙酸、2,4-二氯苯氧基乙酸、敌草隆和莠去津的最大吸附容量分别为1.88、1.67、1.10和0.89 mmol·g。从稀释溶液和浓缩溶液中吸附农药证实扩散是限制因素。在东帝汶建立活性炭生产装置的可能性对该国非常有前景。这为创造就业机会、减少生物质废物以及对环境可持续性做出贡献提供了契机，从而遵循了循环经济的原则。
