Journal
RSC ADVANCES
Volume 7, Issue 24, Pages 14395-14405Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra00287d
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Funding
- Specialized Research Fund for the National Natural Science Foundation of China [51504119, 21567013]
- National high technology research and development plan (863 Program) [2015AA020201]
- Yunnan Applied Basic Research Project [2015FB129]
- Yunnan Provincial Science and Technology Innovation Talents Scheme Technological Leading Talent [2013HA002]
- Extracurricular Science and Technology Innovation Fund Project of Kunming University of Science and Technology [2015YB004]
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Copper loaded activated carbon (Cu-AC) was prepared by impregnating it with cupric nitrate followed by microwave heating and then used for removing dyes in wastewater. The Cu-AC was thoroughly characterized by N-2 adsorption and desorption isotherms, SEM, EDS, XRD, XPS, FT-IR, and Raman. It was proven that cupric nitrate was successfully loaded onto activated carbon with the resulting formation of copper, copper oxide, and cuprous oxide. The Cu-AC was used to treat five kinds of dyes in wastewaters (Rhodamine B, MB, Amaranth, Congo red, and Eosin-Y). Comparing the adsorption capacity of these five dye wastewaters, it was proven that copper and copper oxides have photocatalytic degradation ability that can improve dye removal efficiency. Experimental adsorption data of MB were fit using several kinetic and isotherm models. Kinetic studies indicated that a pseudo-second order is the most suitable model for the adsorption process with a correlation coefficient of R-2 > 0.999. The equilibrium adsorption data of MB showed that it followed the Langmuir isotherm; the Langmuir maximum adsorption capacity was 373 mg g(-1). Compared with ordinary activated carbon, the maximum adsorption capacity of Cu-AC increased by 37.8%. Additionally, through thermodynamic calculations the negative value of Delta G and positive value of DH showed that the adsorption was a spontaneous and endothermic process. All the above results reveal that Cu-AC can be an effective absorbent for removing dyes from wastewater.
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