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Synthesis of low-density polyethylene derived carbon nanotubes for activation of persulfate and degradation of water organic micropollutants in continuous mode
Publication . Ribeiro, Rui; Vieira, Octávia; Fernandes, Rita; Roman, Fernanda; Díaz de Tuesta, Jose Luis; Silva, Adrián; Gomes, Helder
Plastic derived carbon nanotubes (CNTs) were tested as catalysts in persulfate activation for the first time. Four
catalysts were prepared by wetness impregnation and co-precipitation (using Al2O3, Ni, Fe and/or Al) and
implemented to grow CNTs by chemical vapour deposition (CVD) using low-density polyethylene (LDPE) as
carbon feedstock. A catalyst screening was performed in batch mode and the best performing CNTs
(CNT@Ni+Fe/Al2O3-cp) led to a high venlafaxine mass removal rate (3.17 mg g- 1 h- 1) in ultrapure water after
90 min (even with a mixture of micropollutants). Its degradation increased when the matrix was replaced by
drinking water and negligibly affected in surface water. A composite polymeric membrane was then fabricated
with CNT@Ni+Fe/Al2O3-cp and polyvinylidene fluoride (PVDF), a high venlafaxine mass removal rate in surface
water being also observed in 24 h of continuous operation. Therefore, the results herein reported open a window
of opportunity for the valorisation of plastic wastes in this catalytic application performed in continuous mode.
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Fundação para a Ciência e a Tecnologia
Programa de financiamento
9471 - RIDTI
Número da atribuição
PTDC/EAM-AMB/31049/2017