Catalytic degradation of phenols by recyclable CVD graphene films

Abstract

Ferrous ion-based catalysts have been widely employed to oxidatively destruct the major industrial pollutants such as phenolic compounds through advanced oxidation processes (AOPs). These agents, however, inevitably show several drawbacks including the need for pH adjustment and further purification steps to remove residual salts. Here we report the use of a chemical vapour deposition (CVD) graphene film as a novel metal-free catalyst for the AOP-based degradation of phenols in aqueous solution, which does not require additional steps for salt removal nor external energy to activate the process. We have also verified that the catalytic activity is strongly dependent on the surface area of the graphene film and the degradation efficiency can be markedly improved by exploiting an array of multiple graphene films. Finally, the recyclability of the graphene film has been validated by performing repetitive degradation tests to ensure its practical use.

Functionalization of Graphene with O and S for Catalytic Degradation of Chlorophenols and Dyes

“…But there is a small percentage of photo catalytic activity as (shown in the Fig. 4c), to an extent of seven percent (7%) and it may be due to the defects in the crystal structure and the intermediate electronic trap states which also correlates with the reports [2], [3], [15].…”

“…Also, the ID/IG ratio increases with increase in the degree of disorderliness in the structure creating defect structures and the trend increases with an increase in processing temperature. The increased defect on the structure of sp 2 Carbon can contribute for the enhanced catalytic property. [9], [10].…”

“…Phenol and its chloro derivatives in particular are important compounds in many industries but are also hazardous and potentially mutagenic and/or carcinogenic, resistant to microbial degradation and hence more focus is on the treatment wastewater from such industrial sources [2]. Among the phenol derivatives, Chlorophenols (CPs) are the well-known pollutants of industrial wastewater originating from the industrial processes involving wood, fibre, paint and leather preservatives, pesticides and disinfectants.…”

Piezo‐Acoustic Resistive Switching Behaviors in High‐Performance Organic–Inorganic Hybrid Perovskite Memristors

“…The reproducible RS with a large ON/OFF ratio was far superior to other pure electric‐driven HPs memristors such as MA 3 Sb 2 Br 9 and Cs 3 Bi 2 I 9 , indicating ultralow energy consumption. [ 70,71 ] Generally, this phenomenon proved that the higher SPL stimulation could produce more energetic sound waves for regulating the RS behavior. [ 72 ] Based on the above analysis, we speculated that piezo‐acoustic mechanical stress affected the migration of ions.…”

Highly efficient nitrogen-doped carbon nanotubes coated on paper-like sintered stainless steel fibers as metal-free structured catalyst for phenol degradation

“…However, catalysts usually undergo deactivation resulting from leaching of metallic phase at acidic conditions, and also cause secondary contamination [10][11][12][13][14]. Recently, carbonaceous materials such as graphene [15], carbon nanotube (CNT) [16], graphite [17] and chemicalactivated carbon [18] have aroused great interests in environmental remediation. These materials can selectively decompose H 2 O 2 into reactive HOÁ even without added metal species, endowing them with eco-friendly and metal-free nature.…”