Talc-graphite schist as a natural organo-mineral complex for methylene blue remediation: kinetic and isotherm study

Abstract

Talc-graphite schist (TGSH) is a natural organo-mineral complex that was derived from the regional metamorphism of organic matter-bearing calcareous clays under the lowest temperature and pressure of the green schist facies (573-632 K and 1-3 Kbars, respectively). The application of TGSH that is widely available in the Meatiq area (Eastern Desert, Egypt) was investigated for the first time ever in the remediation of methylene blue dye (MB) from aqueous solutions. The characterization of the TGSH was carried out using various techniques (XRF, XRD, SEM, FT-IR and BET surface area), and its MB removal capacity was estimated at different experimental conditions. The MB adsorption by TGSH was time-and pH-dependent process, where 120 min was sufficient enough to attain equilibrium. The MB adsorption capacity by the TGSH was directly proportional to the applied temperature, confirming that the MB adsorption process was endothermic in behavior. Based on the determination coefficients, the pseudo-second-order equation (R 2 = 0.939) explained MB adsorption data better than the first-order one (R 2 = 0.653). Meanwhile, intra-particle diffusion was not the sole controlling rate in MB removal by the TGSH. Moreover, the nonlinear regressions of Langmuir model (R 2 = 0.876) explained the equilibrium data better than the other applied models (Temkin, R 2 = 0.793, and Freundlich, R 2 = 0.752). On the other hand, the estimated q max (maximum removal capacity) of Langmuir was 9.41 mg/g at ambient temperature. Hydrogen bonding and electrostatic interaction were the governing mechanisms of MB removal by TGSH with variable impact in accordance with the prevailing pH condition.

Efficient dye removal from industrial wastewater using sustainable activated carbon and its polyamide nanocomposite derived from agricultural and industrial wastes in column systems

“…These latter peaks could be ascribed to the γ-phase carbon. 45 Meanwhile, the strong diffraction peak at 2 θ ≈ 25.01° & 26.85° in AC that was recorded as proto-peaks in the precursor SBC (2 θ ≈ 24.5–26.7°) 46 indicates the crystalline carbon. 45 The (002) graphite reflection plane with d (002) ≈ 3.32 Å in the derivative AC was reflected by the strong peak at 2 θ ≈ 26.85°.…”

Sustainable Nano‐Nonwoven Fabric Production from Recycled Polyamide 6 Waste via Electrospinning: Controlling Characteristics and Comprehensive Analytical Study

“…Barrett–Joyner–Halina equation was used to estimate pore volume ( V t ) and pore diameter ( D o ), while the Brunauer–Emmett and Teller equation was applied to determine BET surface area ( S BET ). [ 65 ]…”

Dyeing of Recycled Electrospun Polyamide 6 Nanofibers: Implications of Dye Particle Size

“…The surface areas of both dyes and PA-NWNF (undyed and dyed) were investigated using a Nova Touch LX4 equipment (BET, Quantachrome, USA). Applying the BET approach, N 2 adsorption/desorption tests evaluated the surface area at 77.35 K. The Brunauer-Emmett-Teller equation was used to determine the S BET [43].…”