Abstract
Heavy metal ions in water can cause significant hazards to all living organisms in the ecosystems. This work employs a sol-gel-based process to synthesize a highly photoactive heterojunction composed of molybdenum disulfide (MoS2) and cobalt oxide (Co3O4) nanocrystals. The MoS2/Co3O4 heterojunctions exhibited mesoporous surfaces and high surface areas of 137–161 m2 g−1. Also, the absorption of visible light improved by introducing MoS2 due to the lessening of the bandgap to 1.66 eV for 15% MoS2/Co3O4.The amended photocatalytic reduction of mercury ions (Hg2+) is realized within 50 min of light irradiation over 2.4 gL‒1 of 15% MoS2/Co3O4 at a rate of 36.27 μM min−1 in 30 min and five-times recyclability. The superb action of MoS2/Co3O4 is attributed to the upgraded light absorption and effective separation of carriers.
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