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(searched for: doi:10.1080/01496395.2021.1931326)
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, Bi Irié Hervé Gouré Doubi, Donourou Diabate, Luc Dou Blonde, Trokourey Albert
Published: 23 November 2022
Journal: Chemistry Africa
Chemistry Africa pp 1-14; https://doi.org/10.1007/s42250-022-00473-7

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Muhammad Sadiq Hussain, , Muhammad Imran, Amara Dar, Mehwish Akram,
Published: 8 August 2022
Adsorption Science & Technology, Volume 2022, pp 1-20; https://doi.org/10.1155/2022/9056288

Abstract:
The native peels of two cheap, locally available adsorbents, watermelon (PWM) and water chestnuts (PWC), were chemically processed with different chemicals as modifying agents for the determination and assessment of their adsorption ability for the removal and clearance of harmful, venomous, and pernicious Congo red (CGR), as an acidic nature anionic dye, from the aqueous system. In successive batch experiments, the citric acid-treated peels CPWM and CPWC have shown more promising adsorption performance than their raw and untreated peel counterparts due to the availability of additional adsorption active binding sites evidenced through FT-IR and SEM characterizations. In the Langmuir and Temkin models, the correlation coefficients ( R2 ) for the adsorptive removal of CGR on CPWM, PWM, CPWC, and PWC are very close to unity, 0.99 for each case of adsorption performance. Furthermore, the qmax nonlinear statistical results for the elimination of CGR on citric acid-treated adsorbents (CPWM and CPWC) are 8.3 and 7.95 mg/g whereas for their unmodified forms (PWM and PWC) are 2.23 and 4.32 mg/g, respectively, reflecting homogenous and monolayer adsorption mechanism. The greater values of BT 1.4 and 1.3 J/mole, for adsorptive removal of dye on CPWM and CPWC, respectively, as compared to their unmodified forms PWM and PWC which are 0.53 and 0.55 J/mole, respectively, indicate the stronger adsorbate-adsorbent associations. The mechanism follows the pseudo second order in the better mode, while thermodynamic statics for ΔH0,ΔG0, ΔS0, and ΔE0, indicate spontaneous and exothermic behavior of adsorption. This study tends to suggest that citric acid-modified adsorbents CPWM and CPWC may indeed be exploited efficiently to eliminate Congo red dye from wastewater.
Elvio N. Oliveira, Alex T. Meneses, Samara F. de Melo, Franciele M. R. Dias, Maisa T. B. Perazzini, Hugo Perazzini, , João I. Soletti, Sandra H. V. Carvalho,
Environmental Science and Pollution Research, Volume 29, pp 50661-50674; https://doi.org/10.1007/s11356-022-18788-w

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, Rajiv Periakaruppan, Sugumari Vallinayagam, Sakthivel Gandhi, Mohammad Munawar Tappa, Vipin Kumar Sharma, Ramachandran Sivaramakrishnan, Subramaniyam Suresh, Annadurai Gurusamy
Published: 7 February 2022
Applied Nanoscience pp 1-15; https://doi.org/10.1007/s13204-021-02141-7

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Ilknur Özüdoğru, , Senay Balbay
Published: 30 January 2022
Separation Science and Technology, Volume 57, pp 2024-2040; https://doi.org/10.1080/01496395.2022.2029489

Abstract:
Within the scope of end-of-life tires (ELTs) management, recovery of tires considering circular economy approach is becoming increasingly important. This study aims to examine the sorptive behavior of methylene blue (MB) and Rhodamine B (RB) dyes from synthetic textile industry discharge with a carbon-based sorbent (CBM) recycled from ELTs as a novel patented method and used for the first time for organic dye removal in the literature. The CBM was characterized by using fourier transform infrared (FTIR) and scanning electron microscopy (SEM) for structural and morphological properties. XRD (X-ray diffraction) and XPS (X-ray photoelectron spectroscopy) analysis were used for phase composition and surface chemistry of CBM. The maximum adsorption capacity of MB and RB on CBM is 681.14 and 85.26 mg/g, respectively. For the reusability of the CBM, the regeneration experiment was carried out and MB and RB removal performance of CBM gradually decreased with increasing adsorption cycles. The results show that it is possible to utilize CBM which in terms of ensuring the reuse of wastes within the scope of industrial symbiosis, as an effective adsorbent in dye removal. This study reduces environmental pollution by converting the end-of-life tires into carbon-based material for water/wastewater treatment provides a “win-win” solution to improve waste management. Graphical Abstract
Mahnaz Ghereghlou, ,
Published: 24 January 2022
Separation Science and Technology, Volume 57, pp 2005-2023; https://doi.org/10.1080/01496395.2022.2029490

Abstract:
The Fe3O4@C-dots produced from Elaeagnus Angustifolia, has been applied as an adsorbent for the removal of methylene blue (MB) from aqueous solutions. The prepared Fe3O4@C-dots exhibited a noticeably higher adsorption capacity for MB, reported to be 124.39 mg/g when compared to the results of many other documented references. Furthermore, after evaluating the effects of various parameters on the adsorption capacity of Fe3O4@C-dots, it was discovered that the adsorption capacity increased with the contact time, pH, and MB initial concentration, respectively. Furthermore, the impacts of pH on adsorption were strongly amplified through pHzpc. According to the results, electrostatic interactions, hydrogen bonding, and chemical binding comprise the adsorption mechanism between the MB molecules and adsorbent. The MB adsorption was identified through the kinetic studies to be dominated through the model of pseudo-second-order kinetic. Also, the isotherm analysis showed that the adsorption process is consistent with the Langmuir equations. As the Fe3O4@C-dots were subjected to recycling, no significant changes were observed throughout the adsorption capacity after five regeneration cycles. Considering how the outcomes indicated the capability of magnetic nanoparticles in performing an effective MB removal, we can recommend the high potential of this adsorbent for the clearance of cationic dyes from wastewater. Graphical abstract
M. Ajith Kumar, S. Arivoli S. Arivoli
Oriental Journal Of Chemistry, Volume 38, pp 151-162; https://doi.org/10.13005/ojc/380119

Abstract:
To study the adsorption of Rhodamine-B dye (Rh-B) from artificial aquatic solution by using activated Hygrophila auriculata nano carbon under batch adsorption mode. Activated nano carbon was synthesized from Hygrophila auriculata and it was characterised by analytical methods such as BET(BJH), XRD, FTIR, and SEM with EDX. The equilibrium adsorption data were calculated and it was interrelated using Freundlich, Langmuir, Temkin, Hurkins-Jura, Halsay, Radlich-Peterson, Dubinin-Radushkevich, Jovanovic, and Brunauer Emmett Teller (BET) isotherm models. The kinetics of the adsorption technique was examined via pseudo- second order, Elovich mode and intraparticle diffusion methods. Thermodynamic parameters like change of free energy (ΔG°), change of enthalpy (ΔH°), and change of entropy (ΔS°) has been estimated. The value of regression coefficient (R2) indicates that Langmuir isotherm suitable to designate the process. The maximum adsorption capacity of monolayer is 204.11mg/g at 40°C. Based on the R2 value the adsorption mechanism was fitting to the pseudo-second order model. Thermodynamic factors obtained (ΔG° ranged from -4429.50 to -640.26 kJ/mol; ΔH° ranged from 5.38 to 12.84 kJ/mol; and ΔS° ranged from 19.82 to 50.23 J/K/mol, correspondingly) representing the Rh-B dye removal from artificial aquatic solutions by AHANC is there spontaneous, endothermic and possible in nature respectively. The outcomes point out that AHANC could be used as low-price and an effective adsorbent for the removal of Rh-B dye from artificial aqueous solution.
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