TY - JOUR
T1 - Effect of rGO loading on Fe 3 O 4
T2 - A visible light assisted catalyst material for carbamazepine degradation
AU - Moztahida, Mokrema
AU - Jang, Jiseon
AU - Nawaz, Mohsin
AU - Lim, Seong Rin
AU - Lee, Dae Sung
N1 - Publisher Copyright:
© 2019
PY - 2019/6/1
Y1 - 2019/6/1
N2 - Carbamazepine (CBZ), an anticonvulsant drug, is one of the most recalcitrant pharmaceuticals detected in wastewater. For the photocatalytic degradation of CBZ, visible light assisted heterogeneous Fenton-like hybrid composites were synthesized via a co-precipitation method by anchoring magnetite (Fe 3 O 4 ) with reduced graphene oxide (rGO). The rGO loading not only reduced the aggregation of Fe 3 O 4 nanoparticles, but also increased the adsorption capacity of the hybrid composites. The mass ratio of rGO in the composites substantially affected CBZ photocatalytic degradation and a 10 wt% rGO loading (rGF10) provided nearly complete CBZ degradation within 3 h. Moreover, the addition of rGO reduced the charge recombination of the bare Fe 3 O 4 nanoparticles and provided more accessible reactive sites, enhancing the degradation capacity. The visible light excited Fe 3 O 4 nanoparticles yielded reactive species such as hydroxyl radicals (·OH), holes (h + ), and superoxide radicals (O 2 · − ) during the photodegradation process that were evaluated by using specific scavengers during the degradation experiment. The hybrid catalyst was effective under wide pH ranges (from 3 to 9) and showed faster degradation rates in the acidic condition. The composites were magnetically separable, easily regenerated, and exhibited considerably high photocatalytic activity up to five cycles.
AB - Carbamazepine (CBZ), an anticonvulsant drug, is one of the most recalcitrant pharmaceuticals detected in wastewater. For the photocatalytic degradation of CBZ, visible light assisted heterogeneous Fenton-like hybrid composites were synthesized via a co-precipitation method by anchoring magnetite (Fe 3 O 4 ) with reduced graphene oxide (rGO). The rGO loading not only reduced the aggregation of Fe 3 O 4 nanoparticles, but also increased the adsorption capacity of the hybrid composites. The mass ratio of rGO in the composites substantially affected CBZ photocatalytic degradation and a 10 wt% rGO loading (rGF10) provided nearly complete CBZ degradation within 3 h. Moreover, the addition of rGO reduced the charge recombination of the bare Fe 3 O 4 nanoparticles and provided more accessible reactive sites, enhancing the degradation capacity. The visible light excited Fe 3 O 4 nanoparticles yielded reactive species such as hydroxyl radicals (·OH), holes (h + ), and superoxide radicals (O 2 · − ) during the photodegradation process that were evaluated by using specific scavengers during the degradation experiment. The hybrid catalyst was effective under wide pH ranges (from 3 to 9) and showed faster degradation rates in the acidic condition. The composites were magnetically separable, easily regenerated, and exhibited considerably high photocatalytic activity up to five cycles.
KW - Carbamazepine
KW - Fenton-like heterogeneous catalyst
KW - Photocatalytic degradation
KW - Reduced graphene oxide-loaded-magnetite composite
KW - Solar light
UR - http://www.scopus.com/inward/record.url?scp=85062394862&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2019.02.376
DO - 10.1016/j.scitotenv.2019.02.376
M3 - Article
C2 - 30851607
AN - SCOPUS:85062394862
SN - 0048-9697
VL - 667
SP - 741
EP - 750
JO - Science of the Total Environment
JF - Science of the Total Environment
ER -