Removal of phenol from oil/gas produced water using supercritical water treatment with TiO 2  supported MnO 2  ctalyst

Silva, Chamara L. De; Garlapalli, Ravinder K.; Trembly, Jason

doi:10.1016/j.jece.2016.12.015

Cited by 27 publications

(7 citation statements)

References 17 publications

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“…Several methods have been investigated for the removal and degradation of phenolic compounds from aqueous solutions. These include physicochemical treatment processes, chemical oxidation, biological degradation, and combined techniques [10][11][12][13]. Many of these processes have disadvantages such as the generation of dangerous by-products, low e ciency and applicability to limit concentrations of pollutants [9].…”

Section: Introductionmentioning

confidence: 99%

Phenol Removal from Aqueous Solution by Adsorption Process: Study of The Nanoparticles Performance Prepared from Alo vera and Mesquite (Prosopis) Leaves

et al. 2017

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Abstract. This study was performed to measure the potential utilization of agro-waste to generate nanoparticles and evaluate its capability as a low-cost adsorbent for phenol removal. Adsorption studies for phenol removal using aloe vera and mesquite leaves nanoparticles were carried out under various experimental conditions including pH, nanobioadsorbent dosage, phenol concentration, contact time, temperature, and ionic strength in a batch reactor. The adsorption kinetics were applied by pseudo-rst order and pseudosecond order models and isotherm technique by Freundlich and Langmuir isotherms models. The results showed that the rate of phenol adsorption increases in both nano-bioadsorbents with an increase in pH up to 7, adsorbent dosage up to 0.08 gL 1 , phenol initial concentration up to 32 mgL 1 , contact time up to 60 min, and a raise in temperature. The adsorption data followed the Freundlich isotherm model. The kinetic studies indicated that the adsorption of phenol with nano-bioadsorbents was best described by the pseudo-second order kinetics. We found that the nanoparticles prepared from aloe vera and mesquite leaves had a high capability in adsorption of phenol, besides the point that they could be accessed at low cost. These agro-wastes can be used to remove phenol from aqueous environments.

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Section: Introductionmentioning

confidence: 99%

Phenol Removal from Aqueous Solution by Adsorption Process: Study of The Nanoparticles Performance Prepared from Alo vera and Mesquite (Prosopis) Leaves

et al. 2017

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“…A thermocouple within the heater block acted as feedback control. After the heater, the water feed flowed past a thermocouple before entering the top of the reactor as a downflow (De Silva et al 2017 ).…”

Section: Methodsmentioning

confidence: 99%

“…However, the proper usage of catalysts could effectively improve the oxidant concentration and reactor energy demand without affecting the operational performance (Xu et al 2020). An appropriate catalyst not only improves the removal of chemical oxygen demand (COD) of the waste but also enhances the selectivity of phenols into CO 2 , CH 4 , and H 2 (Nadjiba et al 2017 (Abdpour and Santos, 2020, De Silva et al 2017, Huelsman and Savage, 2013. Top et al (2020) reported that supercritical water oxidation (SCWO) process significantly removed over 90% COD, TOC, SS, and BOD of real hospital wastewater after 60 s retention time at 25 ± 1 MPa, 450°C, and H 2 O 2 /COD ratio of 1:1.…”

Section: Introductionmentioning

confidence: 99%

“…An appropriate catalyst not only improves the removal of chemical oxygen demand (COD) of the waste but also enhances the selectivity of phenols into CO 2 , CH 4 , and H 2 (Nadjiba et al 2017 ). Recently, different heterogeneous catalysts including V 2 O 5 /Al 2 O 3 , MnO 2 /CeO 2 , TiO 2 , Caroline 150, CuO/ZnO/CoO, and MnO 2 have been used by different researchers for phenol oxidation (Abdpour and Santos, 2020 , De Silva et al 2017 , Huelsman and Savage, 2013 ).…”

Section: Introductionmentioning

confidence: 99%

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Supercritical water oxidation of phenol and process enhancement with in situ formed Fe2O3 nano catalyst

Al-Atta

Sher

Hazafa

et al. 2021

Environ Sci Pollut Res

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During the past few decades, the treatment of hazardous waste and toxic phenolic compounds has become a major issue in the pharmaceutical, gas/oil, dying, and chemical industries. Considering polymerization and oxidation of phenolic compounds, supercritical water oxidation (SCWO) has gained special attention. The present study objective was to synthesize a novel in situ Fe2O3nano-catalyst in a counter-current mixing reactor by supercritical water oxidation (SCWO) method to evaluate the phenol oxidation and COD reduction at different operation conditions like oxidant ratios and concentrations. Synthesized nano-catalyst was characterized by powder X-ray diffraction (XRD) and transmission electron microscope (TEM). TEM results revealed the maximum average particle size of 26.18 and 16.20 nm for preheated and non-preheated oxidant configuration, respectively. XRD showed the clear peaks of hematite at a 2θ value of 24, 33, 35.5, 49.5, 54, 62, and 64 for both catalysts treated preheated and non-preheated oxidant configurations. The maximum COD reduction and phenol oxidation of about 93.5% and 99.9% were observed at an oxidant ratio of 1.5, 0.75 s, 25 MPa, and 380 °C with a non-preheated H2O2 oxidant, while in situ formed Fe2O3nano-catalyst showed the maximum phenol oxidation of 99.9% at 0.75 s, 1.5 oxidant ratio, 25 MPa, and 380 °C. Similarly, in situ formed Fe2O3 catalyst presented the highest COD reduction of 97.8% at 40 mM phenol concentration, 1.0 oxidant ratio, 0.75 s residence time, 380 °C, and 25 MPa. It is concluded and recommended that SCWO is a feasible and cost-effective alternative method for the destruction of contaminants in water which showed the complete conversion of phenol within less than 1 s and 1.5 oxidant ratio.

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“…Several methods have been investigated for removing and degradation of phenolic compounds from aqueous solutions. These include physicochemical treatment processes, chemical oxidation, biological degradation and combined techniques [10][11][12][13]. Many of these processes have disadvantages such as the generation of dangerous by-products, low efficiency and applicability to limit concentrations of pollutants [9].…”

Section: Introductionmentioning

confidence: 99%

Phenol Removal from Aqueous Solution by Adsorption Process: Study of The Nanoparticles Performance Prepared from Alo vera and Mesquite (Prosopis) Leaves

et al. 2017

View full text Add to dashboard Cite

This study was performed to measure the potential utilization of agro-waste to generate nanoparticles and evaluate the capability of it's as a low cost adsorbent for removal of phenol. Adsorption studies for phenol removal by using Aloe vera and Mesquite leaves nanoparticles carried out under various experimental conditions including pH, nanobioadsorbent dosage, phenol concentration, contact time, temperature and ionic strength in a batch reactor. The adsorption kinetics by pseudo-first order and pseudo-second order models and isotherm technique by Freundlich and Langmuir isotherms models were applied. The results showed that the rate of phenol adsorption increases in both nano-bioadsorbents with an increase of pH up to 7, adsorbent dosage up to 0.08 gL -1 , phenol initial concentration up to 32 mgL -1 , contact time up to 60 min and raising in temperature. The adsorption data followed the Freundlich isotherm model. The kinetic studies indicated that the adsorption of phenol with nano-bioadsorbents was best described by the pseudo second order kinetics. We found that the nanoparticles prepared from Aloe vera and Mesquite leaves had a high capability in adsorption of phenol, beside the point that they could be accessed at a low cost. These agrowastes can be used to remove phenol from aqueous environments.

show abstract

Removal of phenol from oil/gas produced water using supercritical water treatment with TiO 2 supported MnO 2 ctalyst

Cited by 27 publications

References 17 publications

Phenol Removal from Aqueous Solution by Adsorption Process: Study of The Nanoparticles Performance Prepared from Alo vera and Mesquite (Prosopis) Leaves

Phenol Removal from Aqueous Solution by Adsorption Process: Study of The Nanoparticles Performance Prepared from Alo vera and Mesquite (Prosopis) Leaves

Supercritical water oxidation of phenol and process enhancement with in situ formed Fe2O3 nano catalyst

Phenol Removal from Aqueous Solution by Adsorption Process: Study of The Nanoparticles Performance Prepared from Alo vera and Mesquite (Prosopis) Leaves

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