Enhanced decolorization efficiency of acid orange 7 by electric field granular-activated carbon combined system and its statistical optimization by response surface methodology

2015 ◽  
Vol 34 (6) ◽  
pp. 1674-1682
Author(s):  
Kyung-Won Jung ◽  
Dae-Sun Park ◽  
Kyu-Hong Ahn
Keyword(s):  
Response Surface Methodology ◽  
Activated Carbon ◽  
Electric Field ◽  
Response Surface ◽  
Granular Activated Carbon ◽  
Statistical Optimization ◽  
Acid Orange 7 ◽  
Combined System ◽  
Acid Orange ◽  
Decolorization Efficiency

Granular activated carbon-biofilm configured sequencing batch reactor treatment of C.I. Acid Orange 7

2008 ◽  
Vol 76 (1) ◽  
pp. 142-146 ◽  
Author(s):  
Soon-An Ong ◽  
Eiichi Toorisaka ◽  
Makoto Hirata ◽  
Tadashi Hano
Keyword(s):  
Activated Carbon ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Granular Activated Carbon ◽  
Acid Orange 7 ◽  
Acid Orange

Optimization and mechanism of Acid Orange 7 removal by powdered activated carbon coupled with persulfate by response surface method

2019 ◽  
Vol 79 (6) ◽  
pp. 1195-1205 ◽  
Author(s):  
Xuxu Wang ◽  
Xuebin Hu ◽  
Chun Zhao ◽  
Zhihua Sun ◽  
Huaili Zheng ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Response Surface ◽  
Response Surface Method ◽  
Acid Orange 7 ◽  
Promoting Effect ◽  
Acid Orange ◽  
Carbon Reduction ◽  
Decolorization Rate ◽  
Surface Method ◽  
Initial Ph

Abstract In this study, powder activated carbon (PAC) utilized to activate peroxydisulfate (PDS) was investigated for decolorization of Acid Orange 7 (AO7). The results indicated a remarkable synergistic effect in the PAC/PDS system. The effect of PAC, PDS dosages and initial pH on AO7 decolorization were studied and the processes followed first-order kinetics. Response surface method with central composite design (CCD) model was utilized to optimize these three factors and analyze the combined interaction. The optimum condition for the decolorization rate of AO7 was analyzed as the following: PAC (0.19 g/L), PDS (1.64 g/L), and initial pH (4.14). Cl− and SO42− showed a promoting effect on AO7 decolorization while HCO3− had a slightly inhibiting effect. Quenching experiments confirmed that both sulfate and hydroxyl radicals were the oxidizing species, and the oxidation reaction occurred on the surface of PAC. The results of UV-vis spectrum with 100% decolorization rate and the 50% total organic carbon reduction indicated highly efficient decolorization and mineralization of AO7 in the PAC/PDS system. Finally, the recovery performance of PAC was studied and the result indicated PAC had poor reuse in reactivity.

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