Visible light driven photoelectrochemical sensor for chromium(VI) by using BiOI microspheres decorated with metallic bismuth

Preparation and photoelectrochemical properties of BiFeO3/BiOI composites

“…10,11 Accordingly, BiOI can be used to construct a heterojunction structure to improve the PEC properties of materials. [12][13][14][15] For example, Liu et al 13 constructed a BiOI/BiPO 4 p-n heterojunction structure via two-step electrodeposition and obtained an enhanced photocurrent density of 2.5 mA cm À2 , which is twice that of bare BiOI and nearly 20 times higher than that of pure BiPO 4 . Ye et al 15 employed BiOI to decorate ZnO/CdS nanorod arrays to overcome the problem of photocorrosion, and consequently, a long-term stability over 6000 s and a high photocurrent density of 3.04 mA cm À2 (1.75 times that of the ZnO/CdS photoanode) were achieved.…”

New Aptamer/MoS2/Ni-Fe LDH Photoelectric Sensor for Bisphenol A Determination

“…For the LDH and MoS 2 /LDH-5% composites, a prominent peak appeared at 450 nm, as well as a less intense peak for MoS 2 /LDH. As a result, the charge-carrier recombination efficiency was lowered in the composite made of MoS 2 and LDH [ 36 , 37 , 38 ]. Because of these factors, MoS 2 /LDH-5% achieved outstanding PEC results.…”

Recent Advances in Electrochemical Monitoring of Chromium

“…During the last years, extensive use of BiOI has been carried out for the elaboration of the photoelectrochemical sensor (PEC) owing to its excellent absorption ability of visible light. However, its use is limited by its low energy conversion efficiency [ 81 , 82 , 83 ]. Recently, Mengying Li et al [ 81 ] developed a PEC sensor designed by composites of BiOI along with Bi/BiOI-X for Cr(VI) monitoring in water samples with a satisfactory recovery of 98–102% at a concentration as low as 15.6 µg·L −1 .…”

“…However, its use is limited by its low energy conversion efficiency [ 81 , 82 , 83 ]. Recently, Mengying Li et al [ 81 ] developed a PEC sensor designed by composites of BiOI along with Bi/BiOI-X for Cr(VI) monitoring in water samples with a satisfactory recovery of 98–102% at a concentration as low as 15.6 µg·L −1 . The mechanism of detection was based on the reduction of chromium specie from Cr(VI) to Cr(III) by photogenerated electrons.…”

“…However, its use is limited by its low energy conversion efficiency [81][82][83]. Recently, Mengying Li et al [81] developed a PEC sensor designed by composites of BiOI along with Bi/BiOI-X for Cr(VI) monitoring in water samples with a satisfactory recovery of 98-102% at a concentration as low as 15. In another approach, the Junwei Di group [80] developed a new PEC sensor modified with PbS quantum dots onto the surface of ITO for measuring Cr(VI) in water samples with a recovery of 91.8-98.2%.…”