Journal
RSC ADVANCES
Volume 10, Issue 12, Pages 7026-7047Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ra10084a
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- Nutrition Research Center, Student Research Committee, Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
- Institute of Animal Reproduction and Food Research of the Polish Academy of Sciences, Olsztyn, Poland
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The effective use of agricultural by-products is definitely a major challenge in waste management. In the walnut fruit processing industry, large amounts of shells are produced as agricultural by-products and discarded or burned produced as fuel. Walnut (Juglans regia L.) is a valuable tree nut in the Juglandaceae family. The fruit is composed of four main parts: the kernel, the skin, the shell, and the husk. The importance of walnuts is mostly related to theirs valuable kernels. However, their shells are currently experiencing as much interest as their kernels due to the beneficial effects of the shells. In the past several years, walnut shell (WS) has been widely explored as a naturally inert plant-based biosorbent. In this review, we first highlight recent scientific literature regarding the development of adsorbents from WS in the form of carbon-based materials including unmodified/modified WS, and activated carbons (ACs). Next, we discuss the potential applications of WS-derived by-products as natural yet effective adsorbents for the removal of various hazardous materials including heavy metals (HMs), synthetic industrial dyes, and harmful chemicals.
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