Boosting sensitive and selective detection toward Pb(II) via activation effect of Co and orbital coupling between Pb and O over Co@Co3O4 nanocatalyst

Construction of a Carbon/Lignosulfonate Adsorbent to Remove Pb2+ and Cu2+

“…5 mL of glutaraldehyde was continuously added to the three-necked flask to react for 3 h. After the reaction was completed, the solid and liquid were separated by centrifugation, washed with deionized water until the washing solution was colorless, and then dried in an oven to obtain carbon-coated modified SL (C/SL). 4 The mechanism of the abovementioned experiment is shown in Figure 1 .…”

“…Next, the brown solid, 6mL of triethylenetetramine, and 100 mL of deionized water were added into a three necked flask in turn, ultrasonically dispersed, and refluxed in a water bath at 60 °C for 30 min. 5 mL of glutaraldehyde was continuously added to the three-necked flask to react for 3 h. After the reaction was completed, the solid and liquid were separated by centrifugation, washed with deionized water until the washing solution was colorless, and then dried in an oven to obtain carbon-coated modified SL (C/SL) . The mechanism of the abovementioned experiment is shown in Figure .…”

“…Water is the matter basis for human survival, but various types of water pollution endanger the lives of people all over the world. The price of industrial development is often environmental pollution, and water pollution of heavy metal ions is one of the most difficult problems to solve. − Heavy metal ions are highly toxic, cannot be degraded, and are easily enriched in the food chain, threatening the life and health of higher organisms. − How to solve this kind of water pollution has become an urgent problem for countries all over the world.…”

General Strategies to Construct Highly Efficient Sensing Interfaces for Metal Ions Detection from the Perspective of Catalysis

“…In this work, partially oxidized cobalt (Co@Co 3 O 4 ) was successfully synthesized by Chen et al, as shown in Figure 6b and c, showing high-selective and -sensitive detection of Pb(II). 54 It showed that Pb(II) obtained a lot of electrons from Co@Co 3 O 4 (Figure S4a) with the formation of longer Pb−O bonds (Figure S4b), greatly promoting the reaction rates and reducing the desorption energy barrier. DFT calculations were employed to display the changes in the electronic structures before and after interacting with Pb(II) of Co 3 O 4 , as shown in Figure S4c and d.…”

“…(c) HRTEM image of Co@Co 3 O 4 . Reproduced with permission from ref (Chen, S. H.; Song, Z. Y.; Li, P. H.; Xiao, X. Y.; Huang, H. Q.; Yang, M.; Lin, C. H.; Li, L. N.; Huang, X. J. J. Hazard.…”