Removal of Acid Orange 51 by micro zero-valent iron under different operational conditions and evaluation of toxicity

2019 ◽  
Vol 26 (18) ◽  
pp. 18392-18402
Author(s):  
Bouthaina Ghariani ◽  
Mouna Messaoud ◽  
Ibtihel Louati ◽  
Rim Mtibaà ◽  
Moncef Nasri ◽  
...  
Keyword(s):  
Zero Valent Iron ◽  
Acid Orange ◽  
Operational Conditions ◽  
Acid Orange 51

Removal of diazo dye Direct Red 23 from aqueous solution using zero-valent iron nanoparticles immobilized on multi-walled carbon nanotubes

2015 ◽  
Vol 71 (9) ◽  
pp. 1367-1374 ◽  
Author(s):  
Mahmoud Reza Sohrabi ◽  
Nafiseh Mansouriieh ◽  
Morteza Khosravi ◽  
Mohsen Zolghadr
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Zero Valent Iron ◽  
Mass Ratio ◽  
Solution Ph ◽  
Operational Conditions ◽  
Multi Walled Carbon Nanotubes ◽  
Diazo Dye ◽  
Zero Valent Iron Nanoparticles ◽  
Walled Carbon Nanotubes

The present study immobilized nanoscale zero-valent iron (nZVI) on multi-walled carbon nanotubes (MWCNTs) to enhance the reactivity of nZVI and prevent its aggregation. This novel composite (nZVI/MWCNT) was characterized by scanning electron microscopy and X-ray diffraction. The results showed that nZVI particles dispersed on the surface of the MWCNTs. The composite was used to remove the diazo dye Direct Red 23 from aqueous solution. The effects of nZVI to MWCNT mass ratio, nanocomposite content, solution pH, initial dye concentration and temperature were studied. The optimum nZVI/MWCNT mass ratio was 1:3. Batch experiments suggest that degradation efficiency decreased as the initial dye concentration increased and increased as the nanocomposite content increased, decreasing the pH from 8 to 4. The reaction followed a pseudo-first-order model under the operational conditions investigated in this study.

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.

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

scholarly journals Mathematical Kinetic Modelling and Representing Design Equation for a Packed Photoreactor with Immobilised TiO2-P25 Nanoparticles on Glass Beads in the Removal of C.I. Acid Orange 7

2015 ◽  
Vol 36 (2) ◽  
pp. 125-133 ◽  
Author(s):  
Behnaz Sheidaei ◽  
Mohammad A. Behnajady
Keyword(s):  
Removal Rate ◽  
Kinetic Modelling ◽  
Packed Bed ◽  
Glass Beads ◽  
Packed Bed Reactor ◽  
Design Equation ◽  
Acid Orange 7 ◽  
Operational Parameters ◽  
Acid Orange ◽  
Operational Conditions

In this work, a design equation was presented for a batch-recirculated photoreactor composed of a packed bed reactor (PBR) with immobilised TiO2-P25 nanoparticle thin films on glass beads, and a continuous-flow stirred tank (CFST). The photoreactor was studied in order to remove C.I. Acid Orange 7 (AO7), a monoazo anionic dye from textile industry, by means of UV/TiO2 process. The effect of different operational parameters such as the initial concentration of contaminant, the volume of solution in CFST, the volumetric flow rate of liquid, and the power of light source in the removal efficiency were examined. A rate equation for the removal of AO7 is obtained by mathematical kinetic modelling. The results of reaction kinetic analysis indicate the conformity of removal kinetics with Langmuir-Hinshelwood model (kL-H = 0.74 mg L-1 min-1, Kads = 0.081 mg-1 L). The represented design equation obtained from mathematical kinetic modelling can properly predict the removal rate constant of the contaminant under different operational conditions (R2 = 0.963). Thus the calculated and experimental results are in good agreement with each other.

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

scholarly journals Optimizing the removal of methylene blue from aqueous solutions using persulfate activated with nanoscale zero valent iron (nZVI) supported by reduced expanded graphene oxide (rEGO)

2021 ◽  
Vol 8 (1) ◽  
pp. 15-24
Author(s):  
Alaa Mohamad Soubh ◽  
Mohammad Ali Abdoli ◽  
Lorin Ali Ahmad
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Reaction Time ◽  
Aqueous Solutions ◽  
Chain Structure ◽  
Zero Valent Iron ◽  
Chemical Compositions ◽  
Operational Conditions ◽  
Sem Image ◽  
Nanoscale Zero Valent Iron

Background: To remove methylene blue (MB) from aqueous solutions, nanoscale zero-valent iron (nZVI) predicated on reduced expanded graphene oxide (rEGO) was used as the activator of persulfate. Methods: Scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) analyses were used to investigate the surface morphology and to examine the surface elemental composition. X-ray diffraction (XRD) was used to determine the chemical compositions of the synthesized compound. In this study, the effects of pH (3-9), activator dose (0.4-1.6 g L-1), persulfate concentration (0.192-0.768 g L-1), and reaction time (0-60 minutes) on the removal of 10 mg L-1 MB were studied by nZVI -reduced expanded graphene oxide/persulfate (nZVI@rEGO/PS) process. Results: The maximum removal efficiencies of MB at optimum operational conditions (pH 3, activator dose = 1.2 g L-1, persulfate concentration = 0.576 g L-1, and reaction time = 20 minutes) by nZVI@rEGO/PS process was 96%. The chemical method was used to prepare expanded graphene. The volume of natural flake graphite increased about 25 times after the process. SEM image of the nZVI@rEGO showed the presence of nZVI placed on the EGO surface in chain structure with a diameter about 100 nm. The EDS analysis of the activator indicated the existence of Fe element to an amount greater than 50%. Conclusion: According to the results, nZVI@rEGO is considered as a promising activator of persulfate.

scholarly journals Degradation of Anionic Dye (Acid Orange II) by Bentonite Supported Nano-Zero Valent Iron

2019 ◽  
Vol 31 (6) ◽  
pp. 1305-1310
Author(s):  
N.A. ZARIME ◽  
W.Z. WAN YAACOB ◽  
H. JAMIL
Keyword(s):  
Zero Valent Iron ◽  
Bet Surface Area ◽  
Batch Adsorption ◽  
Orange Ii ◽  
Acid Orange ◽  
X Ray ◽  
Anionic Dye ◽  
Nano Zero Valent Iron ◽  
Acid Orange Ii ◽  
Adsorbent Materials

The nano-zero valent iron (nZVI) has been reported as an excellent material to decolourize the anionic dyes. Aggregation of nZVI tends to reduce its reactivity. Due to this reason, modifications of nZVI were applied by using bentonite. Bentonite supported nano-zero valent irons (B-nZVI) was synthesized by using reduction method of ferrous ions and sodium borohydride in presence of bentonite. The objective of this study was to evaluate the performance of composite nanoscale zero-valent iron (nZVI) in decolorized of acid orange II from aqueous solutions. All the three adsorbent materials (nZVI, B-nZVI and bentonite) were characterized by physical, chemical, mineralogical and morphological properties such as Brunnaer-Emmett-Teller (BET) surface area, X-ray photoelectron spectroscopy with auger electron spectroscopy (XPS-AES), field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). The batch adsorption tests for all adsorbent materials have been conducted to determine the effectiveness of both materials in dye removal. The five effects have been analyzed in Batch test among others concentration, dose, pH, kinetic and temperature. The study found in all effects, BnZVI (qe opt = 8.9286 mg/g) showed the higher adsorption capacity followed by nZVI (qe opt = 8.1224 mg/g) and bentonite (qe opt = 5.8469 mg/g). The effectiveness of B-nZVI was due to the dispersion of nZVI particles bentonite particles, consequently provided more sites for adsorption. This study discovered that B-nZVI has a high potential to be a low-cost adsorbent for decolorized anionic dye from synthetic dye wastewater.

pH-dependent degradation of acid orange II by zero-valent iron in presence of oxygen

2013 ◽  
Vol 117 ◽  
pp. 59-68 ◽  
Author(s):  
Chun He ◽  
Jiannan Yang ◽  
Linfei Zhu ◽  
Qiong Zhang ◽  
Weichen Liao ◽  
...  
Keyword(s):  
Zero Valent Iron ◽  
Orange Ii ◽  
Acid Orange ◽  
Ph Dependent ◽  
Acid Orange Ii
Sign in / Sign up

Export Citation Format

Share Document