Summary The utilization of plastics has increased in packing sectors consistently, which lead indirectly to increased volumes of plastic wastes posing an environmental threat. Several utilization and recycling techniques of waste plastics are being practiced commercially around the world. In this article, recent conversion techniques of fuel oil from waste plastics and its utilization on a compression‐ignition engine are discussed. Recent statistics says most of the plastic wastes are generated from packing industries that contains polyethylene, polypropylene. In this connection, conversion techniques of polyethylene and polypropylene practiced frequently by researchers include catalytic processing, thermal degradation, and co‐processing. The effect of various parameters like catalysts, reaction temperature, and reaction time of the aforementioned conversion techniques are discussed in this review. Also, few research works about the utilization of waste plastic oil with a compression‐ignition engine along with engine performance and emissions in various blends of diesel with plastic oil are highlighted here. Copyright © 2017 John Wiley & Sons, Ltd.

Zinc oxide (ZnO) is a material that is flexible with distinctive characteristics, such as high sensitivity, wide-ranging, non-toxicity, strong compatibility and strong isoelectricity point that support the consideration with a few exceptions. The advantages for energy and biological science applications depend on nanostructured morphology ZnO based material are regularly studied. These review works concentrate on the recent development in ZnO morphological depends nanomaterial, nanocomposites, and doped materials for the photocatalyst activities.

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