Adsorption of Polycyclic Aromatic Hydrocarbons from aqueous solution by Organic Montmorillonite Sodium Alginate Nanocomposites

Dai, Wenjing; Wu, Pan; Liu, Di; Hu, Jian; Cao, Yang; Liu, Tao-Ze; Okoli, Chukwunonso Peter; Wang, Bing; Li, Ling

doi:10.1016/j.chemosphere.2020.126074

Cited by 65 publications

(27 citation statements)

References 61 publications

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“… 73 On the other hand, the Freundlich model ( eq 8 ) considers the formation of a heterogeneous surface through the multilayers of adsorbed molecules. 74 Finally, the Elovich model ( eq 9 ) consists of the exponential adsorption of molecules on the surfaces of the adsorbent. 75 where C e is the final concentration of solute (mg/L), q e is the solute adsorbed at the equilibrium (mg/g), q m is the maximum solute adsorbed (mg/g), K L is the Langmuir constant, K f and n are the Freundlich constants, and K e is the Elovich constant.…”

Section: Experimental Methodsmentioning

confidence: 99%

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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Section: Experimental Methodsmentioning

confidence: 99%

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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“…Clay minerals, such as montmorillonite (Mt), bentonite (BT), and kaolin (KN), are widely used in water treatment applications due to their high specic surface area, low cost, nontoxicity, and availability in many natural sources. 80,81 Hence, the intercalation of clay minerals into alginate enhances its adsorption property. From this perspective, Das et al 82 fabricated montmorillonite-iron crosslinked alginate beads (MtIAlg) for removing phosphate ions from wastewater (Fig.…”

Section: Clay-modied Alginatementioning

confidence: 99%

Recent developments in alginate-based adsorbents for removing phosphate ions from wastewater: a review

et al. 2022

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“…Although over the last years an increasing number of studies focusing on clays as adsorbent materials of a large variety of organic and inorganic pollutants have been conducted, at this stage, the focus tends to be limited to the laboratory scale [15,20,[24][25][26]. In a near future more work needs to be performed to bridge the knowledge gap in evaluating the efficiencies of clays and modified clays in treating real wastewater effluent or soil samples.…”

Section: Discussionmentioning

confidence: 99%

“…For example, employing organo-zeolite can remove 98% of fluorene (Fluo), Flt, Pyr, Phen, and benzo(a)anthracene (BaA) [18]. Recently, Dai et al [26] synthesized a nanocomposite using organic Mt with sodium alginate and resulted an effective material for the removal of three PAHs from an aqueous solution. This material has the advantage of being recyclable and biodegradable.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Polycyclic Aromatic Hydrocarbons by Natural, Synthetic and Modified Clays

et al. 2021

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Polycyclic aromatic hydrocarbons (PAHs) are of major scientific concern owing to their widespread presence in environmental compartments and their potential toxicological effects on humans and biota. In this study, the adsorption capacity of natural (montmorillonite (Mt)), synthetic (Na-Mica-4), and modified (with octadecylamine and octadecyltrimethylamine (ODA-Mt, ODA-Mica-4, and ODTMA-Mt and ODTMA-Mica-4)) clays were assessed and compared for the removal of 16 PAHs. Materials were synthesized and characterized by X-Ray diffraction, Zeta potential, and Fourier-transform infrared spectroscopy. The results showed its correct preparation and the incorporation of PAHs in the structure of the clays after the adsorption tests. The proposed materials were effective PAH adsorbents, with adsorption percentages close to 100%, in particular those using Mt. Mt and Na-Mica-4 presented a better adsorption capacity than their organofunctionalized derivatives, indicating that the adsorption of PAHs may occur both in the surface part and in the interlayer. The proposed adsorbents take the advantage of being a low cost and highly effective. They can be an interesting alternative for wastewater treatment and soil remediation to prevent PAH contamination.

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Adsorption of Polycyclic Aromatic Hydrocarbons from aqueous solution by Organic Montmorillonite Sodium Alginate Nanocomposites

Cited by 65 publications

References 61 publications

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

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

Recent developments in alginate-based adsorbents for removing phosphate ions from wastewater: a review

Adsorption of Polycyclic Aromatic Hydrocarbons by Natural, Synthetic and Modified Clays

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Adsorption of Polycyclic Aromatic Hydrocarbons from aqueous solution by Organic Montmorillonite Sodium Alginate Nanocomposites

Cited by 65 publications

References 61 publications

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

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

Recent developments in alginate-based adsorbents for removing phosphate ions from wastewater: a review

Adsorption of Polycyclic Aromatic Hydrocarbons by Natural, Synthetic and Modified Clays

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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

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