![]() It is widely used in environmental technology because of its ease use in the removal of organic and inorganic compounds from aqueous effluents. The diversity of its applications, its impact on industrial development and health show its importance in our days. ![]() Activated carbon is one of the most commonly used adsorbents in many liquid and gas phase applications for its adsorbent properties related to porosity and surface area. ![]() Indeed, activated carbon is a highly porous carbonaceous, hydrophobic, and non-polar adsorbent prepared to obtain a high degree of porosity which confers to it a considerable surface area. In the last decades, activated carbon has attracted a lot of attention because of its versatile application in materials science, meeting various criteria required for new materials. The use of activated carbon in the adsorption process is in great demand. These methods include: coagulation-flocculation, biological treatments (biodegradable pollutants), electrochemical methods, membrane processes, adsorption. Physical or chemical processes have been widely used to remove pollutants from wastewater. Scientists from diverse backgrounds are interested in the identification and removing pollutants directly involved in ecosystem unbalances. To avoid the toxic effects of these substances and to protect the environment, it is necessary to treat contaminated effluents before their release in the natural environment. Their presence in effluents is a threat to any biological organism. This constitutes a great concern for public authorities, by the consequences which may occur on living species and their environment.Ĭurrently, industrial wastewater discharges containing relatively large quantities of toxic substances is a growing concern. The increase of industrial sites and human activities has negatively impacted the environment, due to the large quantities of toxic species generated and released in the wild in different forms (solid, liquid and gaseous). In addition, the best activating agent for coal from Acacia auriculeaformis was found to be phosphoric acid. Therefore, its application as an adsorbent for effluents treatment could be explored. CAA was selected as the best activated carbon because of its good surface area and good pore volume compared to those found in the literature. The influence of chemical activation agent on pores formation was confirmed by scanning electron microscopic (SEM) analysis. The BET surface areas of CAA, CAB and CAS were respectively 561.60 m 2/g, 265.00 m 2/g and 395.40 m 2/g. The surface specific areas were determined through the liquid phase adsorption of acetic acid and methylene blue using the Langmuir method and BET analysis. The surface functional groups using Boehm test and the zero point charge (pH ZPC) methods confirmed the acidic, basic and neutral character for CAA, CAB and CAS respectively (CAA: pH ZPC = 4.8, CAB: pH ZPC = 8.2, CAS: pH ZPC = 6.8). The physico-chemical analysis of the three activated carbons indicated that, under the conditions of preparation, the activated carbons possess activation efficiencies lower than 50% (41.81% for CAA, 26.25% for CAB and 48.87% for CAS), low ash content (CAA: 5.00%, CAB: 14.90 and CAS: 6.60%) and iodine values ranging from 190.35 mg/g to 380.71 mg/g, suggesting that the good quality of the prepared activated carbon. The chemical activation method was used for varying the chemical agent namely phosphoric acid H 3PO 4 (CAA), sodium hydroxide NaOH (CAB), and sodium chloride NaCl (CAS). The objective of this work is to prepare one of the best activated carbon (CA) based on wood ( Acacia auriculeaformis). ![]()
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