Adsorptive removal of Cr(VI) by Chitosan-SiO2-TiO2 nanocomposite

Billah, Rachid El Kaim; Shekhawat, Anita; Mansouri, Said; Majdoubi, Hicham; Agunaou, Mahfoud; Soufiane, A.; Jugade, Ravin

doi:10.1016/j.enmm.2022.100695

Cited by 11 publications

(12 citation statements)

References 36 publications

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“…Decreases were noticed in the average pore diameter from 7.86 to 5.50 nm after the modification of cross-linked chitosan, which confirms the incorporation of LDH into the polymer matrix (see Figure S2b,a). ,, Since the pores’ size was between 2 and 50 nm, it confirms the mesoporous behavior of the material. ,, The hysteresis loop shown in Figure S2a was of H4 type, which proves the complexity of the material . The Barrett-Joyner-Halenda (BJH) pore volume curve is shown in Figure S2b.…”

Section: Resultsmentioning

confidence: 60%

“…In XRD spectra (Figure a), it was observed that the characteristic peaks of chitosan disappeared in glutaraldehyde cross-linked chitosan, showing a broad peak centered at 2θ = 20° . In MgAl-LDH, at lower 2θ values, strong diffraction peaks are attributed to characteristic reflections of crystalline nature. , LDH-loaded cross-linked chitosan shows peaks of the 003 and 012 planes of LDH and a broad peak of cross-linked chitosan, confirming the formation of LDH-loaded cross-linked chitosan.…”

Section: Resultsmentioning

confidence: 82%

“…Between 200 and 500 °C, 40% loss in weight was observed due to the destruction of cross-linked chitosan. 21 , 45 , 46 Above 500 °C, the biopolymer was completely destroyed leaving behind stable oxides of magnesium and aluminum oxides. 51 In the DTA analysis of CSC, a first endothermic peak was observed in the range of 25–150 °C due to moisture removal ( Figure 2 d).…”

Section: Resultsmentioning

confidence: 99%

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Multifunctional Cross-Linked Shrimp Waste-Derived Chitosan/MgAl-LDH Composite for Removal of As(V) from Wastewater and Antibacterial Activity

et al. 2023

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This work synthesized a novel chitosan-loaded MgAl-LDH (LDH = layered double hyroxide) nanocomposite, which was physicochemically characterized, and its performance in As(V) removal and antimicrobial activity was evaluated. Chitosan-loaded MgAl-LDH nanocomposite (CsC@MgAl-LDH) was prepared using cross-linked natural chitosan from shrimp waste and modified by Mg−Al. The main mechanisms predominating the separation of As(V) were elucidated. The characteristic changes confirming MgAl-LDH modification with chitosan were analyzed through Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis-differential thermal analysis, and Brunauer-Emmett-Teller measurements. Porosity and the increased surface area play an important role in arsenic adsorption and microbial activity. Adsorption kinetics follows the general order statistically confirmed by Bayesian Information Criterion differences. To understand the adsorption process, Langmuir, Freundlich, and Liu isotherms were studied at three different temperatures. It was found that Liu's isotherm model was the best-fitted model. CsC@ MgAl-LDH showed the maximum adsorption capacity of 69.29 mg g −1 toward arsenic at 60 °C. It was observed that the adsorption capacity of the material rose with the increase in temperature. The spontaneous behavior and endothermic nature of adsorption was confirmed by the thermodynamic parameters study. Minimal change in percentage removal was observed with coexisting ions. The regeneration of material and adsorption−desorption cycles revealed that the adsorbent is economically efficient. The nanocomposite was very effective against Staphylococcus aureus and Bacillus subtilus.

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Section: Resultsmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 99%

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Multifunctional Cross-Linked Shrimp Waste-Derived Chitosan/MgAl-LDH Composite for Removal of As(V) from Wastewater and Antibacterial Activity

et al. 2023

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“…Adsorption experiments were carried out by adding 0.01 g of binary nanocomposite (CS-TiO 2 ) into a 200 mL beaker containing 100 mL of 10 mg/L Cr ions at 25℃. Investigated variables included of pH (3)(4)(5)(6)(7)(8)(9)(10)(11)(12) , contact time (10-100 min) , effect of nanocomposite (10-50 mg) , initial concentration of Cr (VI) ( 10-1000 mg/L) and temperature (25-45℃) were investigated. The adsorption capacity was investigated and calculated by the following equations (1) :…”

Section: Adsorption-desorption Process In a Batch Systemmentioning

confidence: 99%

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confidence: 99%

Synthesis of Chitosan-TiO<sub>2</sub> Nanocomposite for Efficient Cr(VI) Removal from Contaminated Wastewater Sorption Kinetics, Thermodynamics and Mechanism

et al. 2023

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materials have been studied to remove the deadly heavy metals from wastewaters, which is one of the promising sustainable mitigation methods 6) . Chromium ions and other heavy metals were removed using a variety of methods, such as adsorption 7,8) , membrane filtering 9) , advanced oxidation 10) , and precipitation 11,12) . Due to its low cost and economy, adsorption is a suitable method for reducing the level of Cr ions. Its effectiveness is dependent on the number of sites that can be combined with adsorbate ions 13) . Nanocomposites produced by the photolysis technique 14−22) are viable options for the adsorption of certain heavy metals from water 23−25) due to their higher specific area and porosity. Heavy metal reduction or removal from water can be accomplished using chitosan-based nanoparticles as an effective catalyst (adsorbate) 26,27) . Chitosan nanosheets have recently been suggested for use in several wastewater treatment processes 28) . Additionally, chitosan s matrix was doped with or mixed with inorganic nanoparticles like TiO 2 and ferrite. For instance, TiO 2 was integrated into CS nanosheets to absorb heavy ions from wastewater.

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Extraction of rare earth elements from monazite leach liquor using functionalized chitosan sorbents derived from shrimp waste

Matter,

Dhmees,

Salem

et al. 2023

Environ Sci Pollut Res

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With the growing need for high-purity rare-earth elements (REEs), the separation of these REEs has received much attention recently. The objective of this research is to produce chitosan from shrimp waste, then modify it with different functionality, and investigate the adsorption properties of chitosan adsorbents towards La(III) ions. First, from shrimp waste, chitosan (ch) with a significant degree of deacetylation, purity, and solubility was produced. The purified chitosan was cross-linked with epichlorohydrin (ep), and then, it was modified with 3,6,9,12-tetraazatetradecane-1,14-diamine (HA) to produce polyaminated chitosan (HA@ep@Ch). The polycarboxylated/imine chitosan (CM@HA@ep@Ch) was obtained by treating polyaminated chitosan with chloroacetic acid in isopropyl alcohol. The chitosan adsorbents were characterized and applied for lanthanum recovery from synthetic and monazite leach liquor samples. The factors controlling the recovery process were studied and discussed. The performance of the adsorbents was achieved through equilibrium, dynamic, and isothermal studies. HA@ep@Ch and CM@HA@ep@Ch showed good performance for lanthanum recovery with a maximum capacity of 114.52 and 141.76 mg/g at 330 K, respectively. The isotherm parameters refer to the monolayer of lanthanum adsorbed into the adsorbents through chelation and ion exchange mechanisms. A 0.5-M HCl solution was found effective to elute 95.8% of the adsorbed lanthanum on HA@ep@Ch, and 93.4% of the adsorbed lanthanum on CM@HA@ep@Ch. The adsorbents showed greater selectivity in extracting La, Ce, Pr, Nd, and Sm (62–75%) from REE leach liquid compared to extracting other REEs (20–41%).

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Adsorptive removal of Cr(VI) by Chitosan-SiO2-TiO2 nanocomposite

Cited by 11 publications

References 36 publications

Multifunctional Cross-Linked Shrimp Waste-Derived Chitosan/MgAl-LDH Composite for Removal of As(V) from Wastewater and Antibacterial Activity

Multifunctional Cross-Linked Shrimp Waste-Derived Chitosan/MgAl-LDH Composite for Removal of As(V) from Wastewater and Antibacterial Activity

Synthesis of Chitosan-TiO<sub>2</sub> Nanocomposite for Efficient Cr(VI) Removal from Contaminated Wastewater Sorption Kinetics, Thermodynamics and Mechanism

Extraction of rare earth elements from monazite leach liquor using functionalized chitosan sorbents derived from shrimp waste

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