Metal oxide-chitosan based nanocomposites for efficient degradation of carcinogenic PAHs

Rani, Manviri; Rachna,; Shanker, Uma

doi:10.1016/j.jece.2020.103810

Cited by 71 publications

(28 citation statements)

References 52 publications

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“…Furthermore, the amount of TiO 2 found in the clay samples had a higher concentration compared to other clay samples from different African countries . The main chemical components (SiO 2 , Al 2 O 3 , Fe 2 O 3 , K 2 O, TiO 2 , and MgO) in the clay samples are efficient oxide used as semiconductors or promoters in nanomaterial composites for environmental application, including wastewater treatment. − …”

Section: Resultsmentioning

confidence: 89%

Geochemical and Physicochemical Characteristics of Clay Materials from Congo with Photocatalytic Activity on 4-Nitrophenol in Aqueous Solutions

et al. 2020

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This study investigated the geochemical and physicochemical characteristics of natural clay collected in the Democratic Republic of Congo. The optical properties of the sample collected in Golf (GOL) were tested in the removal of 4-nitrophenol in aqueous solution. The geochemical analysis depicted that all the samples are plotted within the shale quadrant. Furthermore, the Chemical Index of Alteration (CIA) indicated that the samples are extremely weathered. The particle size distribution ranged from 0.41 to 418.6 μm, while the pore diameters for all the samples were under 100 Å. A flake-like surface morphology was observed in all the samples. SiO2, Al2O3, Fe2O3, K2O, and TiO2 were the major chemical compounds found in all the samples, while the XRD analysis showed the presence of quartz, kaolinite, magnetite, and illite. The presence of metal oxides (i.e., TiO2 and Fe2O3) indicated that these natural clays can be used for photocatalytic oxidation of pollutants. The sample collected in Katuba (KAT) displayed the higher reflectance percentages for the selected wavelengths except at 200 nm. Interestingly, the GOL sample exhibited lower energy band gaps (2.68 and 3.94 eV) necessary for photocatalysis. The untreated GOL clay sample removed 99.13% of 4-nitrophenol from aqueous solution through the photodegradation process. The usage of the untreated GOL clay could be a cost-effective solution in the removal of 4-nitrophenol in wastewater.

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Section: Resultsmentioning

confidence: 89%

Geochemical and Physicochemical Characteristics of Clay Materials from Congo with Photocatalytic Activity on 4-Nitrophenol in Aqueous Solutions

et al. 2020

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“…Chitosan is a linear cationic polysaccharide composed mainly of a large number of protonated amine (−NH 3 + ) and deprotonated hydroxyl (−O – ) functional groups, which provide high availability of active sites to enhance the adsorption capacity. 16 Additionally, these functional groups can easily promote a chemical (grafting), 17 physical (van der Waals forces), 18 and electrostatic (interaction between positive and negative charges) bonds, 19 leading to the formation of more complex structures. 20 Although chitosan is nontoxic, biocompatible, inexpensive, reactive, and widely available in nature, it also presents some limitations, such as chemical stability, thermal resistance, mechanical strength, and low porosity.…”

Section: Introductionmentioning

confidence: 99%

“…20 Although chitosan is nontoxic, biocompatible, inexpensive, reactive, and widely available in nature, it also presents some limitations, such as chemical stability, thermal resistance, mechanical strength, and low porosity. 16 Also, the physicochemical properties of chitosan, including the adsorption efficiency, can be improved with the immobilization of other materials through cross-linking procedures. 21 Nanomaterials such as iron oxide (FeO) nanoparticles are widely used for the modification of biopolymers, aiming to improve the physicochemical properties.…”

Section: Introductionmentioning

confidence: 99%

“…Adsorbent materials based on chitosan as bio-supports have demonstrated to be promising for adsorption of organic pollutants from water sources. Chitosan is a linear cationic polysaccharide composed mainly of a large number of protonated amine (−NH 3 + ) and deprotonated hydroxyl (−O – ) functional groups, which provide high availability of active sites to enhance the adsorption capacity . Additionally, these functional groups can easily promote a chemical (grafting), physical (van der Waals forces), and electrostatic (interaction between positive and negative charges) bonds, leading to the formation of more complex structures .…”

Section: Introductionmentioning

confidence: 99%

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Ionic Cross-Linking Fabrication of Chitosan-Based Beads Modified with FeO and TiO₂ Nanoparticles: Adsorption Mechanism toward Naphthalene Removal in Seawater from Cartagena Bay Area

et al. 2020

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Polycyclic aromatic hydrocarbons (PAHs) are complex molecules produced by the thermal decomposition of organic matter in anthropogenic activities. Novel composites with enhanced physicochemical properties aim to overcome limitations such as adsorption capacity, affinity, and stability for PAHs adsorption. Composites based on chitosan are promising due to the good biocompatibility and adsorption properties. This study focuses on the facile preparation of chitosan beads modified with iron oxide (FeO) and titanium dioxide (TiO 2 ) nanoparticles via ionic cross-linking (Ch-FeO/TiO 2 ). FeO and TiO 2 were synthesized performing co-precipitation and green chemistry methods, respectively. The characterization evidenced the formation of Ch-FeO/TiO 2 with good crystallinity, excellent thermal stability, and superparamagnetic response, attributed to the presence of FeO and TiO 2 nanoparticles. High thermal stability up to 270 °C was related to the cross-linked chitosan network. The enhanced adsorption mechanism of Ch-FeO/TiO 2 was determined by removing naphthalene from water and seawater samples. The Ch-FeO/TiO 2 showed a higher adsorption capacity of 33.1 mg/g compared to 29.8 mg/g of the unmodified chitosan (un-Ch) beads. This is due to the higher functional surface area of 27.13 m 2 /g, compared to that of 0.708 m 2 /g for un-Ch. We found a rapid adsorption rate of 240 min and the maximum adsorption capacity of 149.3 mg/g for Ch-FeO/TiO 2 . A large number of actives sites allows for increasing the naphthalene molecules interaction. Adsorption in seawater samples from Cartagena Bay (Colombia) exhibits an outstanding efficiency of up to 90%. These results suggest a promising, cheap, and environmentally friendly composite for remediation of water sources contaminated with complex compounds.

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“…For Zn-Fe 3 O 4 -CS (phenanthrene: 92%), the effect of degradation was improved (catalyst weight: 2 mg; neutral pH; PAH: 2 mg/L) accompanied by a greater surface area (80.109 m 2 /g) and a zeta potential of −33.7 mV. The interaction between H 2 O/O 2 with the electron-hole pair formed on the catalytic shell strengthened with both metal oxides, and the phenanthrene was gradually decayed under solar illumination [ 40 ].…”

Section: Photocatalytic Degradation Of Phenanthrenementioning

confidence: 99%

Metal-Based Nanocomposite Materials for Efficient Photocatalytic Degradation of Phenanthrene from Aqueous Solutions

et al. 2021

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Polycyclic aromatic hydrocarbons (PAHs) are a class of naturally occurring chemicals resulting from the insufficient combustion of fossil fuels. Among the PAHs, phenanthrene is one of the most studied compounds in the marine ecosystems. The damaging effects of phenanthrene on the environment are increasing day by day globally. To lessen its effect on the environment, it is essential to remove phenanthrene from the water resources in particular and the environment in general through advanced treatment methods such as photocatalytic degradation with high-performance characteristics and low cost. Therefore, the combination of metals or amalgamation of bimetallic oxides as an efficient photocatalyst demonstrated its propitiousness for the degradation of phenanthrene from aqueous solutions. Here, we reviewed the different nanocomposite materials as a photocatalyst, the mechanism and reactions to the treatment of phenanthrene, as well as the influence of other variables on the rate of phenanthrene degradation.

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Metal oxide-chitosan based nanocomposites for efficient degradation of carcinogenic PAHs

Cited by 71 publications

References 52 publications

Geochemical and Physicochemical Characteristics of Clay Materials from Congo with Photocatalytic Activity on 4-Nitrophenol in Aqueous Solutions

Geochemical and Physicochemical Characteristics of Clay Materials from Congo with Photocatalytic Activity on 4-Nitrophenol in Aqueous Solutions

Ionic Cross-Linking Fabrication of Chitosan-Based Beads Modified with FeO and TiO₂ Nanoparticles: Adsorption Mechanism toward Naphthalene Removal in Seawater from Cartagena Bay Area

Metal-Based Nanocomposite Materials for Efficient Photocatalytic Degradation of Phenanthrene from Aqueous Solutions

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Metal oxide-chitosan based nanocomposites for efficient degradation of carcinogenic PAHs

Cited by 71 publications

References 52 publications

Geochemical and Physicochemical Characteristics of Clay Materials from Congo with Photocatalytic Activity on 4-Nitrophenol in Aqueous Solutions

Geochemical and Physicochemical Characteristics of Clay Materials from Congo with Photocatalytic Activity on 4-Nitrophenol in Aqueous Solutions

Ionic Cross-Linking Fabrication of Chitosan-Based Beads Modified with FeO and TiO2 Nanoparticles: Adsorption Mechanism toward Naphthalene Removal in Seawater from Cartagena Bay Area

Metal-Based Nanocomposite Materials for Efficient Photocatalytic Degradation of Phenanthrene from Aqueous Solutions

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Ionic Cross-Linking Fabrication of Chitosan-Based Beads Modified with FeO and TiO₂ Nanoparticles: Adsorption Mechanism toward Naphthalene Removal in Seawater from Cartagena Bay Area