Removal of Sudan IV from a simulated biphasic oily wastewater by using lipophilic carbon adsorbents

Tuesta, Jose L. Díaz de; Silva, Adrián M.T.; Faria, Joaquim L.; Gomes, Helder

doi:10.1016/j.cej.2018.04.105

Cited by 33 publications

(26 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Table 1 summarizes BET and external surface area (S BET and S ext , respectively) and the most relevant properties of the pristine CB and DCB materials, reported in our previous work [33], such as content of heteroatoms, acidity and pH at the point of zero charge (pH PZC ). As observed, values obtained of S BET and S ext were lower than 90 m 2 g −1 , which are low values of specific surface when compared to another carbonaceous materials [54] and consequently is not expected to observe a significant contribution in the removal of the pollutant by adsorption. In addition, the values of S BET and S ext were found to be close to each other, leading to a null micropore specific surface.…”

Section: Kinetic Modellingmentioning

confidence: 70%

“…The textural properties of the materials were determined from N 2 adsorption-desorption isotherms at 77 K, obtained in a Micromeritics Tristar 3000 apparatus. The BET surface area (S BET ) was calculated using the BET method, whereas the external surface area (S ext ) and micropore volume (V mic ) were obtained by the t-method (thickness was calculated by employing ASTM standard D-6556-01) [54]. The microporous surface area (S mic ) was determined as the subtraction of S ext from S BET (S mic = S BET -S ext ).…”

Section: Characterization Techniquesmentioning

confidence: 99%

See 1 more Smart Citation

The pH effect on the kinetics of 4-nitrophenol removal by CWPO with doped carbon black catalysts

et al. 2020

Self Cite

View full text Add to dashboard Cite

Section: Kinetic Modellingmentioning

confidence: 70%

Section: Characterization Techniquesmentioning

confidence: 99%

The pH effect on the kinetics of 4-nitrophenol removal by CWPO with doped carbon black catalysts

et al. 2020

Self Cite

View full text Add to dashboard Cite

“…1. As can be observed, all the materials show a low adsorbed N 2 volume at low relative pressure (p/p 0 ), revealing that the materials contain less micropores (< 2 nm) than activated carbons [7]. On the other hand, at higher relative pressures, a hysteresis loop between the adsorption and the desorption branches is observed.…”

Section: Characterization Of the Cntsmentioning

confidence: 68%

“…In our previous study, the adsorption of Sudan-IV, selected as a model lipophilic pollutant, was assessed using modified activated carbons [7]. However, adsorption is not a destructive technique and an additional treatment is necessary to remove the pollutant from the adsorbent.…”

Section: Introductionmentioning

confidence: 99%

Janus amphiphilic carbon nanotubes as Pickering interfacial catalysts for the treatment of oily wastewater by selective oxidation with hydrogen peroxide

et al. 2020

Self Cite

View full text Add to dashboard Cite

Janus-like amphiphilic carbon nanotubes (CNTs) were tested as catalysts in the oxidation of 2-nitrophenol (2-NP) with hydrogen peroxide. A biphasic oil-water medium was used to simulate oily wastewater contaminated with the lipophilic model pollutant 2-NP. The CNTs were synthesized by sequentially feeding ethylene and/or acetonitrile, used as carbon and carbon/nitrogen precursors, respectively. The results obtained for 2-NP removal using biphasic systems were compared with those obtained by CWPO using aqueous solutions. The most active catalyst in the CWPO of 2-NP in aqueous solution was the CNT synthesized only with ethylene. This was explained by its high lipophilic character, allowing the complete removal of 2NP after 24 h of reaction at 50°C, pH 0 = 3, C cat = 0.25 g L −1 , C 2-NP,0 = 0.5 g L −1 and the stoichiometric quantity of H 2 O 2 needed for the total mineralization of 2-NP. For the oxidation of 2-NP in biphasic medium, only the Janus-like amphiphilic CNTs (containing a lipophilic undoped section synthetized from ethylene and a hydrophilic N-doped section synthetized from acetonitrile) revealed catalytic activity for the removal of 2-NP. The conversion of 2NP reached in biphasic oxidation conditions was 76.7% after 24 h of reaction at 50°C, considering pH 0 = 3, C cat = 2.27 g L −1 of total volume (water/oil ratio of 16:50 v/v) and C 2-NP,oil,0 = 5 g L −1. This removal was ascribed to the formation of Pickering emulsions, by maximizing the interfacial area through an increased contact between the catalyst and both liquid phases. A kinetic model is proposed to accurately predict the experimental data and evaluate the rate constants of the process and its variation with the prepared CNTs.

show abstract

“…The textural properties of the materials were determined from N 2 adsorption-desorption isotherms at 77 K, obtained in a Quantachrome instrument NOVA TOUCH LX4 [47]. The specific surface area (S BET ) was calculated using the BET method using the Quantachrome TouchWin TM software 1.21.…”

Section: Techniques Of Characterizationmentioning

confidence: 99%

Wet Peroxide Oxidation of Paracetamol Using Acid Activated and Fe/Co-Pillared Clay Catalysts Prepared from Natural Clays

et al. 2019

View full text Add to dashboard Cite

Many pharmaceuticals have been recently identified at trace levels worldwide in the aquatic environment. Among them, the highly consumed paracetamol (PCM), an analgesic and antipyretic drug, is largely being accumulated in the aquatic environment due to inefficient removal by conventional sewage treatment plants. This work deals with the treatment of PCM, used as a model pharmaceutical contaminant of emerging concern, by catalytic wet peroxide oxidation using clay-based materials as catalysts. The catalysts were prepared from natural clays, extracted from four different deposits using acid-activated treatment, calcination, and pillarization with Fe and Co. Pillared clays show the highest catalytic activity owing to the presence of metals, allowing to remove completely the PCM after 6 h under the following operating conditions: CPCM = 100 mg L−1, CH2O2 = 472 mg L−1, Ccat = 2.5 g L−1, initial pH = 3.5 and T = 80 °C. The prepared materials presented high stability since leached iron was measured at the end of reaction and found to be lower than 0.1 mg L−1.

show abstract

Removal of Sudan IV from a simulated biphasic oily wastewater by using lipophilic carbon adsorbents

Cited by 33 publications

References 30 publications

The pH effect on the kinetics of 4-nitrophenol removal by CWPO with doped carbon black catalysts

The pH effect on the kinetics of 4-nitrophenol removal by CWPO with doped carbon black catalysts

Janus amphiphilic carbon nanotubes as Pickering interfacial catalysts for the treatment of oily wastewater by selective oxidation with hydrogen peroxide

Wet Peroxide Oxidation of Paracetamol Using Acid Activated and Fe/Co-Pillared Clay Catalysts Prepared from Natural Clays

Contact Info

Product

Resources

About