Sawdust-based activated carbon ability in the removal of phenol-based organics from aqueous media

International audienc

The use of calcium alginate-activated carbon composite material in fixed-bed columns for methylene blue removal from wastewater

International audienc

Application of Ulva lactuca and Systoceira stricta algae-based activated carbons to hazardous cationic dyes removal from industrial effluents

International audienc

SAWDUST-BASED ACTIVATED CARBON FOR MALACHITE GREEN REMOVAL: KINETIC AND THERMODYNAMIC STUDY

Sawdust as a lignocellulosic solid waste, has been valorized and used as an adsorbent for the removal of Malachite green (MG) from aqueous solution. Impregnation in 20% KOH (SDK), and (NH4) 2 S 2 O 8 (SDP) solutions then pyrolysis at 600°C for 3 hours were found to enhance the adsorption capacity of malachite green (MG) as a pollutant significantly relative to its inactivated state (SDU). The batch adsorption experiments resulted in a maximum adsorption capacity determined from Langmuir models of up to 434.78 mg/g, 238.10 and 200.0 for SDK, SDP and Merck respectively. Parameters influencing adsorption capacity such as contact time, adsorbent dosage, pH and temperature were studied. FT-IR analyses and iodine number determination were also performed to characterize the prepared adsorbents. Adsorption kinetics was found to comply with the pseudo second order with a good correlation factor (R 2 = 0.99) with intraparticle diffusion as the rate determining steps. Thermodynamic analysis and temperature effects of the process confirm that the adsorption reaction was spontaneous (ΔG o 0). This study showed that sawdust as a waste could prove to be a very useful in removing toxic substances from the environment

Synthetic textile wastewater treatment: Removal of Nylosan (N-2RBL) dye by electrocoagulation

International audienc

Enhancement of the Adsorptive Properties of a Desert Salsola Vermiculata Species

Heat pretreatment, steam activation and 20% phosphoric acid activation were found to enhance the adsorption capacity of a desert Salsola Vermiculata plant species significantly relative to the inactivated plant and powdered wood carbon 600200 EX 694 as obtained from Belgium. The batch adsorption experiments resulted in a maximum adsorption capacity determined from Langmuir models of up to 476 mg/g for acetic acid, 238 mg/g for copper(II) ions and 144 mg/g for nickel(II) ions, whereas for the inactivated plant they attained values of 53 mg/g, 65 mg/g and 18 mg/g, respectively. The results for the wood carbon were 65 mg/g for acetic acid, 45 mg/g for copper(II) ions and 2.4 mg/g for nickel(II) ions. The Freundlich model was found to provide a better description of copper(II) ion adsorption onto the steam- and chemically-activated plant, whereas nickel(II) ion adsorption processes followed Langmuir behaviour. These results showed that the activated plant could prove to be very useful in removing toxic substances from wastewater

The influence of surface functionalization of activated carbon on dyes and metal ion removal from aqueous media

International audienc

Removal of Phenol and 4-Chlorophenol from Aqueous Solutions by Olive Stone-Based Activated Carbon

The evaluation of agricultural by-products as a means of removing pollutants from contaminated wastewater is attracting increasing interest for sustainable development applications. The present work deals with the removal of phenol and 4-chlorophenol from aqueous solutions by chemically activated olive stones. The olive stones were soaked in 50% phosphoric acid for 3 h at 443 K. After washing, the product was activated in an inert atmosphere for 2 h or 3 h at temperatures within the range 873–1023 K. The carbons thus prepared were characterized by Methylene Blue and iodine adsorption, N 2 adsorption at 77 K in conjunction with the BET equation, scanning electron microscopy (SEM) and Boehm titrations. The sorption capacity towards both pollutants was determined by fitting the Langmuir model to the adsorption isotherms. The optimum activation temperature and time were 1023 K and 3 h, respectively. A maximum adsorption capacity of 189 mg/g was obtained for phenol and 436 mg/g for 4-chlorophenol. In comparison, the Merck and Aldrich commercial-grade powdered activated carbons ranked lower with adsorption capacities of 145 mg/g and 179 mg/g for phenol and 244 mg/g and 316 mg/g for 4-chorophenol, respectively

Characterization and application of three novel biosorbents “ Eucalyptus globulus , Cynara cardunculus , and Prunus cerasefera ” to dye removal

International audienc

Enhancement of Ni2+ removal capacity of activated carbons obtained from Mediterranean Ulva lactuca and Systoceira stricta algal species

International audienc