Nowadays, aquatic pollution is one of the most important global challenges, due to discharges a wide variety of various hazardous materials from different activities which have significant environmental, economic and healthy impacts. Industries and activities related to organic dyes consume large amounts of water and contribute significantly to the growing problem of water pollution. The current study describes the conversion of plant wastes into activated carbon sphere incorporated sulfonated polystyrene (AC/SPS) for adsorptive removal of Rhodamine B (RhB) and Congo Red (CR) dyes in a batch process. The prepared materials were characterized in term of phase structure, composition, morphology, size, porosity and thermal stability usingX-rays diffraction (XRD), Fourier transform-infra red (FT-IR), field emissionscanning electron (FT-SEM), energy dispersive X-ray (EDX) , transmittance electron microscopy (TEM), Brunauer, Emmett, Teller (BET)-Barrett, Joyner, Halenda (BJH), and Thermogravimetric Analysis (TGA) . The AC/SPS in weight ratio of 10% was used as a novel adsorbent for RhB and CR remediation. The effects of equilibrium time, adsorbent dose, initial pH and temperature and have been investigated. The maximum removal efficiency of RhB and CR onto AC/SPS under optimized conditions was estimated to be 34% and 98%, respectively. Langmuir and Freundlich models provided the most appropriate fit for the adsorption of both RhB and CR, respectively. Based on the thermodynamic study, it was proven that the adsorption process for both dyes is endothermic and spontaneous. The kinetic study revealed that the adsorption process followed of both dyes the pseudo-second order kinetic model.
The paper reports the study of the complex formation of cobalt (II) with diethylenetriaminepentaacetic acid (DTPA, H5L) based on spectrophotometric (SF) and potentiometric data (pH). Complexes of different compositions were found, and equilibrium constants, as well as the stability constants of these complexes, were determined. Accumulation of complexes in proportion is calculated based on the acidity of the medium. The experimental data have been carried out by using mathematical models to assess the solution's possible existence with a wide spectrum of complex particles and to point out those which are quite sufficient to copy the experimental data. In addition, thermodynamic parameters (ΔG°, ΔH°, and ΔS°) for the studying complexes were calculated according to the values of stability constant (KST) at 25 °C obtained from the temperature dependence of stability constant by using van’t Hoff equation.
Nowadays, aquatic pollution is one of the most important global challenges, due to discharges a wide variety of various hazardous materials from different activities which have significant environmental, economic and healthy impacts. Industries and activities related to organic dyes consume large amounts of water and contribute significantly to the growing problem of water pollution. The current study describes the conversion of plant wastes into activated carbon sphere incorporated sulfonated polystyrene (AC/SPS) for adsorptive removal of Rhodamine B (RhB) and Congo Red (CR) dyes in a batch process. The prepared materials were characterized in term of phase structure, composition, morphology, size, porosity and thermal stability usingX-rays diffraction (XRD), Fourier transform-infra red (FT-IR), field emission-scanning electron (FT-SEM), energy dispersive X-ray (EDX) , transmittance electron microscopy (TEM), Brunauer, Emmett, Teller (BET)-Barrett, Joyner, Halenda (BJH), and Thermogravimetric Analysis (TGA) . The AC/SPS in weight ratio of 10% was used as a novel adsorbent for RhB and CR remediation. The effects of equilibrium time, adsorbent dose, initial pH and temperature and have been investigated. The maximum removal efficiency of RhB and CR onto AC/SPS under optimized conditions was estimated to be 34% and 98%, respectively. Langmuir and Freundlich models provided the most appropriate fit for the adsorption of both RhB and CR, respectively. Based on the thermodynamic study, it was proven that the adsorption process for both dyes is endothermic and spontaneous. The kinetic study revealed that the adsorption process followed of both dyes the pseudo-second order kinetic model.
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