Multifunctional photoactive and selective adsorbent for arsenite and arsenate: Evaluation of nano titanium dioxide-enabled chitosan cross-linked with copper

Pincus, Lauren N.; Melnikov, Fjodor; Yamani, Jamila S.; Zimmerman, Julie

doi:10.1016/j.jhazmat.2018.06.033

Cited by 49 publications

(50 citation statements)

References 58 publications

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“…Furthermore, during the degradation process, CS-TiO 2 :Cu photo-oxidizes As(III) to As(V) through ROS generation, and As(V) is chelated due to the presence of Cu into the composite, which acts as an As(V) chelating agent. Moreover, it has been reported that a CS-TiO 2 :Cu composite exhibited better adsorption properties than traditional adsorbents (Cu, TiO, Al 2 O 3 ) for As(III) and As(V) removal in systems buffered at pH 6 [87]. These results are in agreement with those of Yazdani et al [83] during arsenate (73%) and arsenite (84%) removal from an aqueous solution using a CS-TiO 2 -feldspar composite.…”

Section: Environmental Applicationssupporting

confidence: 88%

Chitosan-TiO2: A Versatile Hybrid Composite

et al. 2020

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In recent years, a strong interest has emerged in hybrid composites and their potential uses, especially in chitosan-titanium dioxide (CS-TiO 2 ) composites, which have interesting technological properties and applications. This review describes the reported advantages and limitations of the functionalization of chitosan by adding TiO 2 nanoparticles. Their effects on structural, textural, thermal, optical, mechanical, and vapor barrier properties and their biodegradability are also discussed. Evidence shows that the incorporation of TiO 2 onto the CS matrix improves all the above properties in a dose-dependent manner. Nonetheless, the CS-TiO 2 composite exhibits great potential applications including antimicrobial activity against bacteria and fungi; UV-barrier properties when it is used for packaging and textile purposes; environmental applications for removal of heavy metal ions and degradation of diverse water pollutants; biomedical applications as a wound-healing material, drug delivery system, or by the development of biosensors. Furthermore, no cytotoxic effects of CS-TiO 2 have been reported on different cell lines, which supports their use for food and biomedical applications. Moreover, CS-TiO 2 has also been used as an anti-corrosive material. However, the development of suitable protocols for CS-TiO 2 composite preparation is mandatory for industrial-scale implementation.Materials 2020, 13, 811 2 of 27 they are synthesized by different methods (intercalation of the polymer, sol-gel, hydrothermal, electro-deposition, chemical and physical vapor deposition, suspension and liquid phase deposition). These methods are effective to enhance the technological and mechanical properties of each individual component and also reveal new functionalities [1,3]. Currently, there is a special interest in combining natural polymers such as chitosan (CS) with inorganic materials like titanium dioxide (TiO 2 ) to obtain hybrid composites (CS-TiO 2 ) with beneficial properties [3][4][5][6].Chitosan (CS) is a natural biopolymer (linear polysaccharide comprising 1-4 linked 2-amino-deoxy-β-D-glucan) generally obtained by deacetylation of chitin, the main structural component of crustacean exoskeletons. CS exhibits a poly-cationic character and is non-toxic and biodegradable [7]. CS is considered a biological functional compound with multiple interesting properties. It can form films for food and pharmaceutical applications, including edible coatings, packaging material, or as drug-eluting carrier [5,7]. Its adsorbent capacity can have environmental applications during photocatalytic processes of waste-water treatment [8], and it also has inherent antibacterial and antifungal properties [9]. It is biocompatible with several organic and inorganic compounds by the presence of free amino and hydroxyl functional groups in its structure, which can react with other functional groups by electrostatic forces, hydrogen bonds, or by compound-soak up into the polymeric matrix, thus improving its mechanical and biological properties [10]...

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Section: Environmental Applicationssupporting

confidence: 88%

Chitosan-TiO2: A Versatile Hybrid Composite

et al. 2020

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“…While considering the advantages of chitosan, different composites can be found. Pincus et al (2019) and (Pincus et al, 2018) have developed a composite material including chitosan and nanometal oxides. Nano-metal oxides are good adsorbents but difficult to recover, resulting in high costs.…”

Section: Selective Arsenic Removal By Bio-sorbents Based Methodsmentioning

confidence: 99%

Selective removal of arsenic in water: A critical review

Weerasundara

Bundschuh

2021

Environmental Pollution

141

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Selective removal of arsenic (As) is the key challenge as this not only increases the efficiency of removal of the main As species (neutral As(III) and As(V) hydroxyl-anions) but also allows the reduction of waste significantly as it does not co-remove other solutes. It increase the capacity and lifetime of units, while lowering the cost of the process. A sustainable selective mitigation method should be considered in relation to the economic resources available, the ability of infrastructure to sustain water treatment and the options for reuse and/or safe disposal of treatment residuals. Several methods of selective As removal have been developed, such as precipitation, adsorption and modified iron and ligand exchange. There are two types of mechanisms involved with As removal: Coulombic or ion exchange; and Lewis acid-base interaction. Solution pH is one of the major controlling factors limiting removal efficiency since most of the above-mentioned methods depend on complexation through electrostatic effects. The different features of two different As species make the selective removal process more difficult, especially under natural conditions. Most of the selective As removal methods involve hydrated Fe(III) oxides through Lewis acid-base interaction. Microbiological methods have been studied recently for selective removal of As although there have been only a small number of studies; however, the method shows remarkable results and indicates positive prospects for the future. The biggest challenges in selective removal of As is the presence of phosphate in water which is chemically comparable with As(V).

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“…Past studies have reported the complete oxidation of As(III) to As(V) by TiO 2 in the presence of UV light and oxygen [30,34]. The As(III) adsorption and photo-oxidation capability of biomaterial/TiO 2 composite increases as n-TiO 2 loading [53]. Nevertheless, additional research is required to investigate detailed As(III) oxidation characteristics of PP@TiO 2 .…”

Section: X-ray Photoelectron Spectroscopy (Xps) Studiesmentioning

confidence: 99%

Agro-Waste Derived Biomass Impregnated with TiO2 as a Potential Adsorbent for Removal of As(III) from Water

et al. 2020

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A novel type of adsorbent, TiO2 impregnated pomegranate peels (PP@TiO2) was successfully synthesized and its efficacy was investigated based on the removal of As(III) from water. The adsorbent was characterized using Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectrometer (EDS), X-ray Diffraction (XRD) analysis, and Fourier Transform Infrared (FTIR) Spectroscopy, to evaluate its morphology, elemental analysis, crystallinity, and functional groups, respectively. Batch experiments were conducted on PP@TiO2 for As(III) adsorption to assess the adsorption isotherm, effect of pH, and adsorption kinetics. Characterization data suggested that TiO2 was successfully impregnated on the biomass substrate. The equilibrium data better fitted to the Langmuir isotherm model having a maximum adsorption capacity of 76.92 mg/g and better distribution coefficients (KD) in the order of ~103 mL/g. The highest percentage of adsorption was found at neutral pH. The adsorption kinetics followed the pseudo-2nd-order model. X-ray Photoelectron Spectroscopy (XPS) of the adsorption product exhibited that arsenic was present as As(III) and partially oxidized to As(V). PP@TiO2 can work effectively in the presence of coexisting anions and could be regenerated and reused. Overall, these findings suggested that the as-prepared PP@TiO2 could provide a better and efficient alternative for the synergistic removal of As(III) from water.

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Multifunctional photoactive and selective adsorbent for arsenite and arsenate: Evaluation of nano titanium dioxide-enabled chitosan cross-linked with copper

Cited by 49 publications

References 58 publications

Chitosan-TiO2: A Versatile Hybrid Composite

Chitosan-TiO2: A Versatile Hybrid Composite

Selective removal of arsenic in water: A critical review

Agro-Waste Derived Biomass Impregnated with TiO2 as a Potential Adsorbent for Removal of As(III) from Water

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