Role of inorganic ions and dissolved natural organic matters on persulfate oxidation of acid orange 7 with zero-valent iron

RSC Advances ◽  
2015 ◽  
Vol 5 (121) ◽  
pp. 99935-99943 ◽  
Author(s):  
Huanxuan Li ◽  
Jinquan Wan ◽  
Yongwen Ma ◽  
Yan Wang ◽  
Zeyu Guan
Keyword(s):  
Organic Matter ◽  
Inorganic Ions ◽  
Zero Valent Iron ◽  
Acid Orange 7 ◽  
Organic Matters ◽  
Acid Orange ◽  
Persulfate Oxidation ◽  
Initial Ph ◽  
Natural Organic Matters

The impacts of common anions and organic matter, initial pH and PS dosage on the oxidation of acid orange 7 (AO7) by persulfate (PS) activated with zero-valent iron (ZVI) were investigated.

Preparation of cationic waste paper and its application in poisonous dye removal

2013 ◽  
Vol 67 (11) ◽  
pp. 2560-2567 ◽  
Author(s):  
Fan Yang ◽  
Xiaojie Song ◽  
Lifeng Yan
Keyword(s):  
Low Cost ◽  
Aqueous Suspension ◽  
Order Kinetic ◽  
Acid Orange 7 ◽  
Anionic Dyes ◽  
Experimental Conditions ◽  
Adsorption Models ◽  
Acid Orange ◽  
Initial Ph ◽  
Pseudo Second Order

Cationic paper was prepared by reaction of paper with 2,3-epoxypropyltrimethylammonium chloride in aqueous suspension, and tested as low-cost adsorbent for wastewater treatment. The experimental results revealed that anionic dyes (Acid Orange 7, Acid Red 18, and Acid Blue 92) were adsorbed on the cationic paper nicely. The maximum amount of dye Acid Orange 7 adsorbed on cationic paper was 337.2 mg/g in experimental conditions. The effects of initial dye concentration, temperature, and initial pH of dye solution on adsorption capacity of cationic paper were studied. The pseudo-first-order and pseudo-second-order kinetic models were applied to describe the kinetic data. The Freundlich and Langmuir adsorption models were used to describe adsorption equilibrium. The thermodynamic data indicated that the adsorption process of dye on cationic paper occurred spontaneously.

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.

Formation of nitrogenous disinfection byproducts in MP UV-based water treatments of natural organic matters: The role of nitrate

2021 ◽  
pp. 117583
Author(s):  
Xiao Liu ◽  
Minkyu Park ◽  
Shawn C. Beitel ◽  
Christiane Hoppe-Jones ◽  
Xiang-Zhou Meng ◽  
...  
Keyword(s):  
Disinfection Byproducts ◽  
Organic Matters ◽  
Natural Organic Matters ◽  
Water Treatments

Degradation of Acid Orange 7 by persulfate activated with zero valent iron in the presence of ultrasonic irradiation

2014 ◽  
Vol 122 ◽  
pp. 41-46 ◽  
Author(s):  
Xue Wang ◽  
Liguo Wang ◽  
Jiangbo Li ◽  
Juanjuan Qiu ◽  
Chun Cai ◽  
...  
Keyword(s):  
Ultrasonic Irradiation ◽  
Zero Valent Iron ◽  
Acid Orange 7 ◽  
Acid Orange

Adsorption Behavior of Acid Orange 7 by Crosslinked Cationic Starch

2012 ◽  
Vol 518-523 ◽  
pp. 1724-1728
Author(s):  
Min Zhang ◽  
Xue Zhang ◽  
Ben Zhi Ju ◽  
Shu Fen Zhang
Keyword(s):  
Acid Orange 7 ◽  
Cationic Starch ◽  
Order Model ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Acid Orange ◽  
Cationic Group ◽  
Adsorption Temperature ◽  
Initial Ph ◽  
Pseudo Second Order

A series of crosslinked cationic starches with different degree of substitution(DS) are used to adsorb Acid Orange 7. Some factors, such as pH, adsorption time, adsorption temperature, initial concentration of dye, dose of cationic starch and DS of cationic group are investigated. The results show that the adsorption quickly establish equilibrium within 15 min. The adsorption capacity of the dye increases with the increasing of DS of the crosslinked cationic starches.The initial pH of 2-10 is reasonable. The adsorption of the dye on the crosslinked cationic starch is well described with the pseudo-second-order model and the Langmuir isotherm.

The use of ultrasound to enhance the decolorization of the C.I. Acid Orange 7 by zero-valent iron

2005 ◽  
Vol 65 (1) ◽  
pp. 39-43 ◽  
Author(s):  
H ZHANG ◽  
L DUAN ◽  
Y ZHANG ◽  
F WU
Keyword(s):  
Zero Valent Iron ◽  
Acid Orange 7 ◽  
Acid Orange
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