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Response surface modeling of Carbamazepine (CBZ) removal by Graphene-P25 nanocomposites/UVA process using central composite design
- Source :
- Water Research. 57:270-279
- Publication Year :
- 2014
- Publisher :
- Elsevier BV, 2014.
-
Abstract
- Graphene-P25 (Gr-P25) nanocomposites were synthesized by a simple microwave hydrothermal method. The nanocomposites with different graphene loading were evaluated for the degradation of an important pharmaceutical water pollutant, Carbamazepine (CBZ) under UVA irradiation in a batch reactor. Response surface methodology (RSM) was used to optimize three key independent operating parameters, namely Gr-P25 nanocomposites dose (X1), CBZ initial concentration (X2) and UV light intensity (X3), for photocatalytic degradation of CBZ. The central composite design (CCD) consisting of 20 experiments determined by 23 full factorial designs with six axial points and six center points was used to conduct experiments. The results showed that CBZ removal was significantly affected by the synergistic effect of linear term of Gr-P25 dose (X1) and UV intensity (X3). However, the quadratic terms of Gr-P25 ( X 1 2 ) and UV intensity ( X 3 2 ) had an antagonistic effect on CBZ removal. The obtained RSM model (R2 = 0.9206) showed a satisfactory correlation between experimental and predicted values of CBZ removal. The optimized conditions for achieving 100% CBZ removal with 5 min UVA irradiation were 25.14 mg/L, 167.68 ppb and 1.35 mW/cm2 for Gr-P25 dose, initial concentration of CBZ and UV intensity, respectively.
- Subjects :
- Environmental Engineering
Materials science
Central composite design
Ultraviolet Rays
Batch reactor
Catalysis
Nanocomposites
law.invention
law
Response surface methodology
Waste Management and Disposal
Water Science and Technology
Civil and Structural Engineering
Photolysis
Chromatography
Nanocomposite
Graphene
Ecological Modeling
Factorial experiment
Models, Theoretical
Pollution
Light intensity
Carbamazepine
Degradation (geology)
Anticonvulsants
Graphite
Water Pollutants, Chemical
Environmental Monitoring
Nuclear chemistry
Subjects
Details
- ISSN :
- 00431354
- Volume :
- 57
- Database :
- OpenAIRE
- Journal :
- Water Research
- Accession number :
- edsair.doi.dedup.....4c81c10221c6a770d962ee84eb51b024