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Wastewater Treatment
Published in Charles R. Rhyner, Leander J. Schwartz, Robert B. Wenger, Mary G. Kohrell, Waste Management and Resource Recovery, 2017
Charles R. Rhyner, Leander J. Schwartz, Robert B. Wenger, Mary G. Kohrell
Activated carbon is manufactured from various plant tissues such as wood, sawdust, coconut shells, walnut hulls, or from coal, lignite, or petroleum residues. These materials are carbonized at high temperatures and then activated using hot air or steam to make the final activated carbon product. Activated carbon in granular or powdered form has an extremely high adsorbing surface area.
Functionalization of powdered walnut shell with orthophosphoric acid for Congo red dye removal
Published in Particulate Science and Technology, 2019
Titilope Abiodun Ojo, Adedamola Titi Ojedokun, Olugbenga Solomon Bello
This study revealed that acid activated walnut shell has good adsorbing properties for CR dye removal from aqueous solution. FTIR spectral analysis shows that the acid modification improved the surface functional groups of walnut shell resulting in broader functional groups such as hydroxyl and carbonyl groups that are excellent in dye adsorption. Adsorption equilibrium data fitted the Langmuir isotherm model most. Kinetic study showed that the adsorption data follows pseudo-second-order model. Thermodynamic parameters obtained show that the adsorption of CR dye onto WNAA was found to be both spontaneous and endothermic in nature. Regeneration experiments showed that 0.2 M HCl was the best regenerating agent with maximum dye uptake of 93% after three consecutive cycles. Placing value on these waste material will promote a sustainable and innovative use of walnut shell in the production of cheap and readily available adsorbent in lieu of the expensive commercial activated carbon.
Synthesis of activated carbon from walnut wood and magnetized with cobalt ferrite (CoFe2O4) and its application in removal of cephalexin from aqueous solutions
Published in Journal of Dispersion Science and Technology, 2023
Roya Askari, Shirin Afshin, Yousef Rashtbari, Amir Moharrami, Faezeh Mohammadi, Mehdi Vosuoghi, Abdollah Dargahi
According to studies in this field, there is no report on the use of activated carbon prepared from walnut wood and magnetized with cobalt ferrite in the removal of cephalexin from aqueous solutions. Walnut shell is a good candidate for activated carbon due to its relatively high carbon content. In addition, the initial costs are relatively low. Therefore, in this study, the preparation and efficiency of activated carbon prepared from walnut wood and magnetized with cobalt ferrite in the removal of cephalexin from aqueous solutions were investigated. Finally, isotherms (to study the reaction between the adsorbent and adsorbent) and kinetics (to study the rate of adsorption) were determined.
COD removal from landfill leachate using a high-performance and low-cost activated carbon synthesized from walnut shell
Published in Chemical Engineering Communications, 2018
A. R. Mahdavi, A. A. Ghoresyhi, A. Rahimpour, H. Younesi, K. Pirzadeh
Walnut shell was collected from an orchard in Mazandaran, north of Iran. Table 1 depicts the ultimate and component analysis of the precursor (walnut shell). As can be seen, relatively high carbon content (48.09%), volatile matter, and low ash content converted walnut shell as a suitable candidate for production of porous activated carbon.