Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Synthesis of Carbon Nanotubes (CNTs) from Poultry Litter for Removal of Chromium Cr (VI) from Wastewater

Version 1 : Received: 9 June 2021 / Approved: 11 June 2021 / Online: 11 June 2021 (14:59:33 CEST)

How to cite: Haleem, N.; Jamal, Y.; Khan, S.N.; Baig, M.A. Synthesis of Carbon Nanotubes (CNTs) from Poultry Litter for Removal of Chromium Cr (VI) from Wastewater. Preprints 2021, 2021060325 (doi: 10.20944/preprints202106.0325.v1). Haleem, N.; Jamal, Y.; Khan, S.N.; Baig, M.A. Synthesis of Carbon Nanotubes (CNTs) from Poultry Litter for Removal of Chromium Cr (VI) from Wastewater. Preprints 2021, 2021060325 (doi: 10.20944/preprints202106.0325.v1).

Abstract

Pakistan being an agricultural country is raising 146.5 million commercial and domestic poultry birds which generate around 544,831 tons of waste. This waste finds its final disposal in agricultural land as soil fertilizer or disposal site amendment. The uncontrolled use of poultry litter for this purpose results in environmental impacts such as the emission of methane, a greenhouse gas. However, other options like thermochemical conversion of this waste can offer a better solution wherein poultry litter can be used as low-cost carbon sources for the synthesis of Carbon Nanotubes (CNTs). In this study, efforts have been made to utilize this cheap and plenty of available carbon source for synthesis of CNTs in the presence of Ni/Mo/MgO as a catalyst, through pyrolysis. The optimum mole ratio of catalyst (4:0.2:1) was found to yield more carbon product. Furthermore, process parameters such as temperature, time, polymer & catalyst weight were also optimized. The best possible process parameters that resulted (pyrolysis time (12 min), temperature (825◦C), and catalyst weight (100 mg) good yield of CNTs . The structure and morphology of produced nanotubes were confirmed through X-ray Diffractometer (X-RD) & Scanning Electron Microscopy (SEM). The environmental application of the nanotubes was tested in synthetic chromium solution in the lab using a batch experiment. Different experimental conditions (pH, adsorbent dosage and contact time) were optimized to enhance the adsorption of Cr (VI) by carbon nanotubes and UV-Visible spectrophotometer was used at 540nm to measure the absorbance of Cr (VI). Results show that up to 81.83% of Cr (VI) removal was achieved by using 8 mg of CNTs at pH 3 with 400 rpm at 180 min of contact time. Thus, it was concluded that poultry litter can be a useful source for the synthesis of CNTs and thereby removal of Cr (VI) from industrial tanneries wastewater.

Subject Areas

Poultry litter; Carbon nanotubes; Catalyst; Experimental conditions; Adsorption

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