Increasing demand for non-biodegradable plastics undesirably leads to their accumulation and calls for an appropriate solution for this global crisis. Environmental impacts of PET waste have long been addressed; although some remedies have been proposed, their extensive use in the modern world use demands new studies and recycling techniques. It shows the inadequacy of previous solutions to eliminate this environmental problem. Therefore, researching this subject should not be considered an insignificant issue. Distinctively, this review article has a specific reliance on the use of recycled PET fibers in the production of high-consumption and value-added products that, in addition to considering environmental aspects, can also be attractive to the market. This article deals with recent studies in three product categories (concrete, nonwoven fabrics, yarns) made from recycled PET fibers and shows the high potential of PET fibers for the future industry.
Given the high growth of e-waste around the world and the environmental and health risks associated with it, research on optimal and green methods of e-waste recycling is of great importance in order to find solutions to this global crisis. In particular are techniques that are economically attractive in addition to solving problems. In this paper, our research team has collected some recent methods of metal recycling in which ionic liquids (ILs) play a main member in the extraction process. The advantages of ILs include high selectivity, short operating temperature, lower relative toxicity, multiple use, and minimal waste generation. The results of this research are also compared with the results of previous studies. We have done special research on ILs used in leaching processes and applied in liquid-liquid extraction, and electrodeposition of metal in IL. Also listed in this paper are some experimental processes that can be tested in e-waste and secondary sources recycling. Some of which can be used on an industrial scale.
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