Single-step synthesis of activated magnetic biochar derived from rice husk for hexavalent chromium adsorption: Equilibrium mechanism, kinetics, and thermodynamics analysis

Waste Adsorbent-Derived Interconnected Hierarchical Attapulgite@Carbon/NiCo Layered Double Hydroxide Nanocomposites for Advanced Supercapacitors

“…This was probably attributed to the relatively low content of APT due to carbon formation. Furthermore, no obvious characteristic diffraction peaks of carbon materials were detected, indicating the formation of amorphous carbon . For the as-prepared APT@C/NiCo LDH, there can be simultaneous observation of the typical APT and LDH phase.…”

“…Furthermore, no obvious characteristic diffraction peaks of carbon materials were detected, indicating the formation of amorphous carbon. 38 For the as-prepared APT@C/NiCo LDH, there can be simultaneous observation of the typical APT and LDH phase. APT@C/NiCo LDH-3 exhibited the main characteristic peaks of NiCo LDH at 11.6, 23.3, 34.4, and 34.9°, which corresponded to the (003), (006), (101), and (012) diffraction planes of NiCo LDH (JCPDF No.…”

A green method for decolorization of polysaccharides from alfalfa by S-8 macroporous resin and their characterization and antioxidant activity

“…To investigate the adsorption isotherm of pigment molecules in an APS solution by an S-8 macroporous adsorption resin, the experimental results were fitted by the Langmuir, Freundlich and Temkin models to calculate the maximum adsorption capacity. 33,34 The Langmuir model is suitable for monolayer adsorption on homogeneous surfaces; 18 the Freundlich isothermal adsorption depends on the interaction of adsorbent molecules, making it suitable for nonlinear multilayer adsorption on nonuniform surfaces; 35 and the Temkin isotherm model assumes that the heat of adsorption decreases linearly with increasing contact area. 36 The linearized forms of the Langmuir, Freundlich and Temkin isotherm equations are, respectively: C e / q e = C e / q m + 1/( K 4 q m )ln q e = ln K 5 + ln C e / n q e = RT / f 1 × ln B + RT / f 1 × ln C e where q e (g −1 ) and q m (g −1 ) represent the adsorption capacity of the equilibrium and the theoretical saturation, respectively; C e represents the equilibrium concentration; K 4 represents the adsorption equilibrium constant; K 5 , n , f 1 (J mol −1 ) and B represent constants; T (K) represents the temperature in Kelvin; and R (J mol −1 K −1 ) represents the gas constant, 8.314.…”

“…To investigate the adsorption isotherm of pigment molecules in an APS solution by an S-8 macroporous adsorption resin, the experimental results were tted by the Langmuir, Freundlich and Temkin models to calculate the maximum adsorption capacity. 33,34 The Langmuir model is suitable for monolayer adsorption on homogeneous surfaces; 18 the Freundlich isothermal adsorption depends on the interaction of adsorbent molecules, making it suitable for nonlinear multilayer adsorption on nonuniform surfaces; 35 and the Temkin isotherm model assumes that the heat of adsorption decreases linearly with increasing contact area. 36 The linearized forms of the Langmuir, Freundlich and Temkin isotherm equations are, respectively:…”

Fabrication, characterization and adsorption investigation of Nano zinc oxide–sodium alginate beads for effective removal of chromium (VI) from aqueous solution

“…6a), the correlation coe cients (R 2 ) (0.9905-0.9985) showed the best-tting model for chromium ions adsorption using ZnO-NPs and ALg-ZnO as given in Table 1. Adsorption capacities of ZnO-NPs and ALg-ZnO (31.09 and 34.63 mg/g, respectively) assume that the adsorption of Cr ions on the surface of ZnO-NPs and its composite occurs at a homogeneous adsorption sites, and also there is no mutual interaction between the adsorbed molecules [20]. The values of Langmuir constant (b, L/mg) follow the sequence ALg-ZnO ZnO-NPs, revealing the higher binding strength between ALg-ZnO and Cr(VI).…”