Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 611, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2020.125866
Keywords
Chitosan; Graphene oxide; Phenolic compound; Adsorption; Nitrogen doping
Categories
Funding
- National Natural Science Foundation of China [21677087]
- National Science and Technology Major Project of China Environmental Protection Technology Integration and Key Equipment for Tight Reservoir Development [2016ZX05040-005]
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Nitrogen-doped reduced graphene oxide prepared by annealing chitosan in a graphene oxide matrix showed a high adsorption capacity for phenol and p-nitrophenol, and maintained a high removal efficiency over multiple reuse cycles.
Graphene-based materials with a conjugated pi region possess unique advantages for treating wastewater contaminated with phenolic compounds. To investigate the interaction mechanisms and optimize the removal efficiency of phenol and p-nitrophenol, nitrogen-doped reduced graphene oxide (N-RGO) with an enlarged conjugated 't region and increased hydrophobicity was prepared by annealing a composite of chitosan exfoliated and anchored in a graphene oxide matrix. Results showed that the equilibrium adsorption capacity of N-RGO for phenol and p-nitrophenol was 155.82 and 80.60 mg/g, respectively, at an initial concentration of 200 mg/L, pH of 6, and contact temperature of 30 degrees C. The optimized removal efficiency was attributed to robust pi-pi and hydrophobic interactions. Furthermore, regeneration experiments showed that N-RGO could retain a high removal efficiency (> 80 %) over five cycles of reuse. These findings suggest that N-RGO is a promising technique for the removal of phenolic compounds from wastewater using an efficient and recyclable adsorbent.
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