Highly efficient removal of As(III) from aqueous solutions using goethite/graphene oxide/chitosan nanocomposite

Shan, Huimei; Peng, Sanxi; Zhao, Changsui; Zhan, Hongbin; Zeng, Chunya

doi:10.1016/j.ijbiomac.2020.07.108

Cited by 33 publications

(16 citation statements)

References 85 publications

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“…In the spectrum of ternary composite, CS exhibits clear characteristic absorption peaks due to its original functional groups. These peaks are located at wavenumbers of ~ 3445 cm -1 , ~ 1636 cm -1 , and ~ 1078 cm -1 and respectively are attributed to the overlapping of the –NH and –OH stretching vibrations 32 , 37 , 38 , C = O stretch of –NHCO– in amide group (amide I) 31 , 37 , 39 , and vibrational motions of –C–O–C in glucose unit 3 , 38 . Also, two other bands with a weak intensity have appeared at ~ 2924 cm -1 and ~ 1384 cm -1 , which are attributed to the aliphatic C–H stretching vibration and asymmetric C–H stretch bending of –CH 3 group, respectively 3 , 37 , 38 .…”

Section: Resultsmentioning

confidence: 99%

“…These peaks are located at wavenumbers of ~ 3445 cm -1 , ~ 1636 cm -1 , and ~ 1078 cm -1 and respectively are attributed to the overlapping of the –NH and –OH stretching vibrations 32 , 37 , 38 , C = O stretch of –NHCO– in amide group (amide I) 31 , 37 , 39 , and vibrational motions of –C–O–C in glucose unit 3 , 38 . Also, two other bands with a weak intensity have appeared at ~ 2924 cm -1 and ~ 1384 cm -1 , which are attributed to the aliphatic C–H stretching vibration and asymmetric C–H stretch bending of –CH 3 group, respectively 3 , 37 , 38 . The achieved peaks in the fingerprint region confirm the presence of TiO 2 and ZnO and exhibit their successful incorporation into the polymer structure; therefore, the peaks located at ~ 749 cm -1 , ~ 569 cm -1 and ~ 536 cm -1 , and ~ 484 cm -1 could be respectively assigned to Zn–O–Ti, Ti–O, and Zn–O stretching vibrations 21 , 34 , 35 .…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and characterization of ternary chitosan–TiO2–ZnO over graphene for photocatalytic degradation of tetracycline from pharmaceutical wastewater

Patehkhor

Fattahi

Khosravi‐Nikou

2021

Sci Rep

102

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Various nanocomposites of TiO2–ZnO, TiO2–ZnO/CS, and TiO2–ZnO/CS–Gr with different molar ratios were synthesized by sol–gel and ultrasound-assisted methods and utilized under UV irradiation to enhance the photocatalytic degradation of tetracycline. Characterization of prepared materials were carried out by XRD, FT-IR, FE-SEM, EDX and BET techniques. The TiO2–ZnO with the 1:1 molar ratio supported with 1:2 weight ratio CS–Gr (T1‒Z1/CS1‒Gr2 sample) appeared as the most effective material at the optimized operational conditions including the tetracycline concentration of 20 mg/L, pH = 4, catalyst dosage of 0.5 g/L, and 3 h of irradiation time. As expected, the graphene had a significant effect in improving degradation results. The detailed performances of the T1‒Z1/CS1‒Gr2 were compared with ternary nanocomposites from EDX and BET results as well as from the degradation viewpoint. This novel photocatalyst can be effective in actual pharmaceutical wastewater treatment considering the applied operational parameters.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of ternary chitosan–TiO2–ZnO over graphene for photocatalytic degradation of tetracycline from pharmaceutical wastewater

Patehkhor

Fattahi

Khosravi‐Nikou

2021

Sci Rep

102

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“…For MTAs V concentrations of 0.002 and 0.013 mmol/L, their adsorption experimental data fit better into the pseudo-second-order kinetic model with a coefficient of determination ( R 2 ) greater than 0.90. This implies that the sediment sorption for low and mid-concentration MTAs V mainly occurs on localized sites, where MTAs V forms a monolayer on the surface of natural sediments via a chemisorption mechanism and the migration process is controlled by a second-order rate equation [ 36 , 43 ]. For MTAs V concentration of 0.667 mmol/L, both the above two models obtain a satisfactory value of R 2 , but the R 2 value of the pseudo-second-order kinetic model (0.9672) is slightly higher than that of the pseudo-first-order kinetic model (0.9650).…”

Section: Results and Analysismentioning

confidence: 99%

Sorption of Monothioarsenate to the Natural Sediments and Its Competition with Arsenite and Arsenate

Shan

Zhang

Peng

et al. 2021

IJERPH

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Monothioarsenate (MTAsV) is one of the major arsenic species in sulfur- or iron-rich groundwater, and the sediment adsorption of MTAsV plays an important role in arsenic cycling in the subsurface environment. In this study, batch experiments and characterization are conducted to investigate the sorption characteristic and mechanism of MTAsV on natural sediments and the influences of arsenite and arsenate. Results show that MTAsV adsorption on natural sediments is similar to arsenate and arsenite, manifested by a rapid early increasing stage, a slowly increasing stage at an intermediate time until 8 h, before finally approaching an asymptote. The sediment sorption for MTAsV mainly occurs on localized sites with high contents of Fe and Al, where MTAsV forms a monolayer on the surface of natural sediments via a chemisorption mechanism and meanwhile the adsorbed MTAsV mainly transforms into other As species, such as AlAs, Al-As-O, and Fe-As-O compounds. At low concentration, MTAsV sorption isotherm by natural sediments becomes the Freundlich isotherm model, while at high concentration of MTAsV, its sorption isotherm becomes the Langmuir isotherm model. The best-fitted maximum adsorption capacity for MTAsV adsorption is about 362.22 μg/g. Furthermore, there is a competitive effect between MTAsV and arsenate adsorption, and MTAsV and arsenite adsorption on natural sediments. More specifically, the presence of arsenite greatly decreases MTAsV sorption, while the presence of MTAsV causes a certain degree of reduction of arsenite adsorption on the sediments before 4 h, and this effect becomes weaker when approaching the equilibrium state. The presence of arsenate greatly decreases MTAsV sorption and the presence of MTAsV also greatly decreases arsenate sorption. These competitive effects may greatly affect MTAsV transport in groundwater systems and need more attention in the future.

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“…Fe 3 O 4 can also be formed as rods, spheres, wires and nanoparticles and these can be combined with CS/GO. There has also been a report where FeO(OH) was utilised with CS/GO [168], while γ-Fe 2 O 3 has been combined with chitosan and employed as a magnetic adsorbent [169].…”

Section: Magnetic Chitosan/gomentioning

confidence: 99%

Recent Developments in Chitosan-Based Adsorbents for the Removal of Pollutants from Aqueous Environments

et al. 2021

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The quality of water is continuously under threat as increasing concentrations of pollutants escape into the aquatic environment. However, these issues can be alleviated by adsorbing pollutants onto adsorbents. Chitosan and its composites are attracting considerable interest as environmentally acceptable adsorbents and have the potential to remove many of these contaminants. In this review the development of chitosan-based adsorbents is described and discussed. Following a short introduction to the extraction of chitin from seafood wastes, followed by its conversion to chitosan, the properties of chitosan are described. Then, the emerging chitosan/carbon-based materials, including magnetic chitosan and chitosan combined with graphene oxide, carbon nanotubes, biochar, and activated carbon and also chitosan-silica composites are introduced. The applications of these materials in the removal of various heavy metal ions, including Cr(VI), Pb(II), Cd(II), Cu(II), and different cationic and anionic dyes, phenol and other organic molecules, such as antibiotics, are reviewed, compared and discussed. Adsorption isotherms and adsorption kinetics are then highlighted and followed by details on the mechanisms of adsorption and the role of the chitosan and the carbon or silica supports. Based on the reviewed papers, it is clear, that while some challenges remain, chitosan-based materials are emerging as promising adsorbents.

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Highly efficient removal of As(III) from aqueous solutions using goethite/graphene oxide/chitosan nanocomposite

Cited by 33 publications

References 85 publications

Synthesis and characterization of ternary chitosan–TiO2–ZnO over graphene for photocatalytic degradation of tetracycline from pharmaceutical wastewater

Synthesis and characterization of ternary chitosan–TiO2–ZnO over graphene for photocatalytic degradation of tetracycline from pharmaceutical wastewater

Sorption of Monothioarsenate to the Natural Sediments and Its Competition with Arsenite and Arsenate

Recent Developments in Chitosan-Based Adsorbents for the Removal of Pollutants from Aqueous Environments

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