Performances of local chitosan and its nanocomposite 5%Bentonite/Chitosan in the removal of chromium ions (Cr(VI)) from wastewater

Kinetic, isotherm and mechanism investigations of the removal of phenols from water by raw and calcined clays

“…Properties of clays depend strictly on the crystal chemical feature of the clay minerals of which they are composed. However, due to their cation exchange capacity, low cost, and high availability clays were often considered to study the interaction mechanisms with various organic and inorganic pollutants [20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31].…”

Preparation and Application of Glutaraldehyde Cross-Linked Chitosan Coated Bentonite Clay Capsules: Chromium(vi) Removal From Aqueous Solution

“…The N-H, O-H stretching band was seen at 3691 cm -1 for BC shifted to 3627 cm -1 and and its intensity decreased; a wide O-H band at 3265 cm -1 of intensity decreased, the bands belonging to C-H vibration between 2858 cm -1 shifted to 2870 cm -1 as well as its intensity decreased; N-H bending vibration band at 1585 cm -1 shifted to 1647 cm -1 and its intensity decreased. The band of C-N bending bands at 1420 and 1315 cm -1 shifted to 1396 cm -1 and its intensity increased; C-O stretching band at 1018 cm -1 shifted to 1014 cm -1 its intensity decreased; the Al-OH stretching band at 916 cm -1 shifted to 871 cm -1 ; the intensity of the (Al, Mg)-OH stretching band at 798 cm -1 decreased; and the vibration band belonging to Si-O bending band at 520 cm -1 shifted to 518 cm -1 [18,24]. Figure 1 indicated that BC composite capsules had many functional groups (Si-OH, Al-OH, N-H, C-O, O-H, etc.).…”

“…Turkish perlite with α-MnO2 (PAM) 7.6 0 [2] Turkish perlite γ-Fe2O3 (PGI) 8.64 [2] Ti-Fe kaolinite composite 23.47 [4] Chestnut oak shells 4.44 [7] Prepared carbon with chestnut shells 33.00 [7] Smectite Natural clay 12.50 [13] Activated Smectite Natural clay with sulfuric acid 19.23 [13] Acid-treated sawdust composite beads (SDCCB) 122.30 [17] Cross-Linked Magnetic Chitosan Beads 69.40 [18] Chitosan/Zeolite film 17.28 [18] Chitosan 35.60 [18] N-2-hydroxypropyl trimethyl ammonium chloride chitosan-bentonite 22.17 [18] Cross-linked chitosan 50.00 [18] Oak wood charcoal 30.10 [19] Cross-linked chitosan/bentonite (obtained from China) composite (CCB) 89.13 [19] Oak wood charcoal ash 46.17 [19] Mesoporous NiO nanoparticles 4.73 [19] KIP 210 resin 100.00 [19] Ammonium sulfamate-bacterial cellulose 22.30 [19] Tannin-immobilized activated clay 24.09 [19] Cross-linked chitosan/bentonite composite 89.13 [19] Chitosan(Chitosan extracted from this waste prawn shell)-modified Bijoypur clay biocomposite (CHT-MC) 73.00 [21] Raw kaolinite 11.60 [22] Kaolinite activated by acid 13.90 [22] Kaolinite activated by ZrO 10.90 [22] Kaolinite activated by BA(Tetrabutylammonium) 10.60 [22] Bentonite-nZVI (Nanoscale zero-valent iron) nano-composite 66.10 [22] Mt-algi/PA (Alginate-montmorillonite/polyaniline) 29.89 [22] Mt(Montmorillonite)/Cellulose and Sodium 22.20 [22] Bentonite/Acid activated pillared 1030 [22] N-2-hydroxypropyl trimethyl ammonium chloride chitosan (HTCC)-bentonite nanocomposite 22.17 [25] Commercial Activated carbon (CAC (Figure 3e). The thermodynamic parameters including ΔH°, ΔS° and ΔG° for the adsorption of Cr(VI) are calculated from plotted data, and the results are given in…”

“…In recent years, the researchers have tried various composite production methods in order to activate the adsorbents. It was observed that formation of different composites from natural adsorbents activated them and their adsorption capacities increased [16][17][18].…”

“…In the literature, there are available adorbents prepared with different methods and different bentonite clays and applications of these adsorbents. In the literature, related to bentonite; Cr(VI) adsorption with chitosan/bentonite composite [19], preparation and characterization of bentonite-chitosan nano composite [24], removal of different impurities (dyes, phenolic compounds, fluoride, metals and ions) from aqueous solutions with various chitosanbentonite nanocomposites [25], comparative and competitive adsorption of copper, lead and nickel with powder adsorbent chitosan immobilized on bentonite [26], use of chitosan impregnated modified bentonite as an adsorbent for remediation of oil spill from aqueous solution [27], Mn 2+ modified bentonite for the removal of fluoride from aqueous solution [1], performance of 5% bentonite/chitosan nanocomposite in the removal of Cr(VI) ions from wastewater [18], removal of Pb (II) by magnetic bentonite prepared from Fe3O4 and bentonite [28], bilateral adsorption of silver and copper onto bentonite, adsorption of indium (III) ions from aqueous solution using chitosan coated bentonite beads [29] studies are available.…”