Application of cetyltrimethylammonium bromide bentonite-titanium dioxide photocatalysis technology for pretreatment of aging leachate.
Organobentonite-photocatalysis technology was applied to pretreat aging leachate containing refractory pollutants. The organobentonite was synthesized by organic modifier cetyltrimethylammonium bromide (CTMAB) and natural bentonite. In characterization experiments, we could confirm that organic functional groups of cetyltrimethylammonium (CTMA(+)) cations were successfully loaded on the surface of bentonite. The combination of CTMAB2.5 adsorption and TiO2 photocatalysis was superior to either running separately. Furthermore, removal efficiency of simultaneously utilizing CTMAB2.5 and TiO2 was better than them in succession. The combination technology was feasible and was optimized by response surface methodology (RSM) with COD and NH3-N removal rate as the target responses. The optimal operation conditions calculated from the regression equations were CTMAB2.5 dosage of 7.5 g/L, pH at 3.5, TiO2 dosage of 1.63 g/L, and reaction time for 60.02 min, which maintained the removal of COD and NH3-N at 82% and 37%, respectively.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China.
Fei-Fei
FF
Cai
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China. Electronic address: yzh@hnu.edu.cn.
Zhao-Hui
ZH
Yang
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China.
Jing
J
Huang
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China.
Guang-Ming
GM
Zeng
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China.
Li-Ke
LK
Wang
The Quality Supervision and Management Station of Civil Air Defense Engineering of Changsha City, China.
Jian
J
Yang
D000327:Adsorption; D000641:Ammonia / Q000737:chemistry; D001546:Bentonite / Q000737:chemistry*; D057919:Biological Oxygen Demand Analysis; D002384:Catalysis; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects; D014466:Ultraviolet Rays; D064091:Waste Disposal Facilities; D014874:Water Pollutants, Chemical / Q000737:chemistry*
D002593:Cetrimonium Compounds; D014874:Water Pollutants, Chemical; D001546:Bentonite; C009495:titanium dioxide; D000641:Ammonia; D014025:Titanium; D000077286:Cetrimonium
Adsorption; Leachate; Organobentonite; Photocatalysis; TiO(2)