Sustainable Development: Use of Agricultural Waste Materials for Vanillic Acid Recovery from Wastewater Víctor Ortega, María Dolores Low-cost adsorbents Pistachio shell Peanut shell Biowaste Adsorption technique Value-added product Vanillic acid Project PID2020-115214RB-I00 funded by MCIN/AEI/10.13039/501100011033/and ERDF, A way of making Europe, is gratefully acknowledged. Ana S. Fajardo wants to acknowledge the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant, agreement no. 843870. The management of agricultural waste is an important issue related to environment protection, as the inappropriate disposal of this waste yields negative effects on the environment. Proper management of industrial effluents is totally aligned with sustainable development goal (SDG) number six “clean water and sanitation”, as well as partially related to other several SDG. In this work, two agricultural waste materials were used for vanillic acid recovery from wastewater. In this scenario, vanillic acid could be considered as both an organic pollutant present in several industrial effluents and a high added-value product when isolated. Therefore, its removal from wastewaters, as well as its recovery and isolation, are very interesting from environmental and economical points of view. Peanut and pistachio shells were studied as no-cost and readily accessible potential adsorbents for the removal and recovery of vanillic acid from aqueous solutions. The evolution of equilibrium isotherms of vanillic acid on both biosorbents was investigated. Three isotherm models (Langmuir, Freundlich, and Temkin) were tested to fit the experimental equilibrium data and compared. The Langmuir model provided the best correlation for vanillic acid biosorption onto both peanut and pistachio shells. Finally, the negative values of DG indicated that the biosorption process was spontaneous and thermodynamically favorable for both agricultural waste materials. Accordingly, peanut and pistachio shells were shown to be very efficient low-cost adsorbents, and a promising alternative for vanillic acid recovery from industrial wastewaters. 2022-04-19T06:32:38Z 2022-04-19T06:32:38Z 2022-02-28 info:eu-repo/semantics/article Víctor-Ortega, M.D.; Fajardo, A.S.; Airado-Rodríguez, D. Sustainable Development: Use of Agricultural Waste Materials for Vanillic Acid Recovery from Wastewater. Sustainability 2022, 14, 2818. [https://doi.org/10.3390/su14052818] http://hdl.handle.net/10481/74331 10.3390/su14052818 eng info:eu-repo/grantAgreement/EC/H2020/843870 http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España MDPI