Add time:07/31/2019         Source:sciencedirect.com

Phosphorus (P) recovery is of significant importance due to its limited reserves and non-regenerative nature. In this study, we attempted to recover and utilize P from microorganism to obtain metal phosphide/carbon composites. By P-rich cultivation of a model yeast (Candida utilis), a total 4.3 wt.% P could be accumulated in microorganism. A hydrothermal treatment coupled with pyrolysis approach enabled the formation of cobalt phosphide/carbon (Co2P/C) composites using P-rich microorganism and Co2+ as precursors. Thermogravimetric-mass spectrometry (TG-MS) analysis confirmed the generation of reducing gases (CO, CH4, PH3, etc.) in pyrolysis process, which played important roles for the conversion of phosphate (in microorganism) to phosphide (in Co2P). When adopted as catalyst for peroxymonosulfate (PMS) activation, the developed Co2P/C composite performed well for bisphenol A (BPA) degradation with a 97.8% removal efficiency in 30 min. The recyclability of Co2P/C was also evident by five successive recycle runs. Moreover, intermediates in BPA degradation process were identified by gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-mass spectrometry (LC-MS), which allowed us to propose a BPA degradation pathway. The following preliminary ecotoxicity test using Tetraselmis subcordiformis as ecological indicator confirmed that BPA degradation solution was much less toxic than the original solution. The strategy proposed in this study, which is the utilization of integrated elements (P, C, etc.) in microorganism to develop efficient catalyst, may provide a new solution for the recovery and value-added conversion of biomass/biowaste.

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