Removal of methylene blue onto mineral matrices

Saad, Mohamed El Khames; Mnasri, Najib; Mhamdi, Mohsen; Chafik, Tarik; Elaloui, Elimame; Moussaoui, Younes

doi:10.1080/19443994.2015.1012338

Cited by 18 publications

(3 citation statements)

References 38 publications

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“…and the adsorbate, or a chemical reaction between adsorbent and adsorbate. In fact, at pH<pH ZCN , the surface of the carbon is positively charged, which promotes the adsorption of the anions, while the adsorption of cations is favored at pH>pH ZCN , where the surface of the carbon is negatively charged [28][29][30]135,159,176,184,196,211,[222][223][224]. Tu et al [183] studied the sorption properties of Bermuda grass derived activated carbon for Cr(VI) removal.…”

Section: Timementioning

confidence: 99%

Current State of Porous Carbon for Wastewater Treatment

et al. 2020

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Porous materials constitute an attractive research field due to their high specific surfaces; high chemical stabilities; abundant pores; special electrical, optical, thermal, and mechanical properties; and their often higher reactivities. These materials are currently generating a great deal of enthusiasm, and they have been used in large and diverse applications, such as those relating to sensors and biosensors, catalysis and biocatalysis, separation and purification techniques, acoustic and electrical insulation, transport gas or charged species, drug delivery, and electrochemistry. Porous carbons are an important class of porous materials that have grown rapidly in recent years. They have the advantages of a tunable pore structure, good physical and chemical stability, a variable specific surface, and the possibility of easy functionalization. This gives them new properties and allows them to improve their performance for a given application. This review paper intends to understand how porous carbons involve the removal of pollutants from water, e.g., heavy metal ions, dyes, and organic or inorganic molecules. First, a general overview description of the different precursors and the manufacturing methods of porous carbons is illustrated. The second part is devoted to reporting some applications such using porous carbon materials as an adsorbent. It appears that the use of porous materials at different scales for these applications is very promising for wastewater treatment industries.

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Section: Timementioning

confidence: 99%

Current State of Porous Carbon for Wastewater Treatment

et al. 2020

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“…Surface functional groups have an important influence on adsorption processes. These functional groups are mainly subdivided into acidic or basic groups, affecting the surface charge of the adsorbent and, as a result, the efficiency of adsorption [59,60]. Boehm titration was used for the activated carbons to quantify acidic functional groups; the results are reported in Table 4.…”

Section: Characterization Of Optimized Activated Carbonmentioning

confidence: 99%

Optimization of the Preparation of Activated Carbon from Prickly Pear Seed Cake for the Removal of Lead and Cadmium Ions from Aqueous Solution

et al. 2022

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In this study, we evaluated the use of prickly pear seed cake, a by-product of prickly pear seed oil extraction, as a new precursor for producing activated carbon by phosphoric acid activation, and the obtained carbon’s capacity for heavy metal removal from aqueous solution. Response surface methodology based on the full factorial design at two levels (24) was developed to reduce the number of experiments and reach optimal preparation conditions for the removal of cadmium and lead ions from aqueous solutions. Design Expert 11.1.2.0 Trial software was used for generating the statistical experimental design and analyzing the observed data. Factors influencing the activation process, such as carbonization temperature, activation temperature, activation time, and impregnation ratio, were studied. Responses were studied in depth with an analysis of variance to estimate their significance. Each response was outlined by a first-order regression equation demonstrating satisfactory correspondence between the predicted and experimental results as the adjusted coefficients of correlation. Based on the statistical data, the best conditions for the removal of heavy metals from aqueous solution by the obtained activated carbon were indicated. The maximum iodine number and methylene blue index were 2527.3 mg g−1 and 396.5 mg g−1, respectively, using activated carbon obtained at the following conditions: Tc = 500 °C, Ta = 500 °C, impregnation ratio = 2:1 (g H3PO4: g carbon), and activation time of two hours. The maximum adsorption reached 170.2 mg g−1 and 158.4 mg g−1 for Cd2+ and Pb2+, respectively, using activated carbon obtained at the following conditions: Tc = 600 °C, Ta = 400 °C, impregnation ratio = 2:1 (g H3PO4: g carbon), and activation time of one hour. The activated carbon obtained was characterized by Boehm titration, pH of point of zero charge (pHPZC), Brunauer–Emmett–Teller surface area (SBET), and scanning electron microscopy. Adsorption was performed according to different parameters: pH solution, adsorbent dosage, temperature, contact time, and initial concentration. Regeneration experiments proved that the obtained activated carbon still had a high removal capacity for Cd2+ and Pb2+ after five regeneration cycles.

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“…In the adsorption process, pH has a significant role [30]. Many investigations have established that pH is a critical parameter that affects the adsorption capacity of organic compounds [31]. Generally, acidic substances are adsorbed more efficiently at lower pH values, while basic substances are more strongly adsorbed at high pH values [5].…”

Section: Effect Of Ph and Adsorbent Dosementioning

confidence: 99%

Experimental Design Analysis of Murexide Dye Removal by Carbon Produced from Waste Biomass Material

Dhahri

Guizani

Yılmaz

et al. 2022

Journal of Chemistry

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The aim of this work is to investigate the adsorption of an anionic dye, the Murexide (MX) present in aqueous solution, on activated carbon, derived from prickly pear seed cake biomass after bio-oil extraction. The obtained adsorbent used was characterized by Bohem titration, pH of point of zero charge (pHPZC), FTIR spectroscopy, Brunauer–Emmett–Teller surface area (SBET), and scanning electron microscopy (SEM). The different experimental parameters of the adsorption process, such as temperature, contact time, initial dye concentration, and adsorbent dose, were studied. For the optimization of the process, the effects of these parameters were investigated using the full factorial experimental design methodology. Design Expert 11.1.2.0 Trial software was used for generating the statistical experimental design and analysing the observed data. Langmuir and Freundlich’s adsorption models were employed to provide a description of the equilibrium isotherm. The adsorption process was found to obey Langmuir, which indicates that the Murexide had formed a monolayer onto activated carbon. Furthermore, according to the regression coefficients, it was observed that the kinetic adsorption data can fit better by the pseudo-second-order model compared to the first-order Lagergren’s model. The thermodynamic studies indicated that the adsorption of Murexide occurs in a spontaneous and exothermic process. The regeneration process of the exhausted adsorbent was studied to assess the economic and operational feasibility. According to the obtained findings, it is proposed that the activated carbon prepared from prickly pear seed cake retains a high potential for Murexide removal and is suitable for repetitive usage.

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Removal of methylene blue onto mineral matrices

Cited by 18 publications

References 38 publications

Current State of Porous Carbon for Wastewater Treatment

Current State of Porous Carbon for Wastewater Treatment

Optimization of the Preparation of Activated Carbon from Prickly Pear Seed Cake for the Removal of Lead and Cadmium Ions from Aqueous Solution

Experimental Design Analysis of Murexide Dye Removal by Carbon Produced from Waste Biomass Material

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