Developing
highly efficient photocatalysts toward synchronously
removing heavy metals and organic pollutants is still a serious challenge.
Herein, we depict hierarchical S-scheme heterostructured photocatalysts
prepared via in situ anchoring UiO-66-NH2 nanoparticles
onto the CdIn2S4 porous microsphere structures
assembled with numerous nanosheets. In the mixed system of Cr(VI)
and tetracycline (TC), the optimal photocatalyst (CIS@U66N-30) shows
remarkable photocatalytic activities toward the synchronous removal
of Cr(VI) (97.26%) and TC (close to 100% of) under visible-light irradiation
for 60 min, being the best removal rates among those of the reported
photocatalysts, and sustains the outstanding stability and reusability.
Its reaction rate constants of Cr(VI) reduction and TC degradation
are about 2.06 and 1.58 folds that in the single Cr(VI) and TC systems,
respectively. The enhanced photocatalytic activities of CIS@U66N-30
mainly result from the following synergism: (1) its hierarchical structure
offers abundant active sites, and the S-scheme migration mechanism
of charge carriers in the heterostructure accelerates the separation
and migration of the useful photoinduced electrons and holes with
the high redox capability; (2) Cr(VI) and TC can serve as the electron
scavenger for TC oxidation degradation and the hole and •OH scavenger for Cr(VI) reduction, respectively, further enhancing
the separation and utilization efficiency of photoinduced electrons
and holes. Besides, the possible TC degradation pathway and plausible
S-scheme photocatalytic mechanism over CIS@U66N-30 for the concurrent
elimination of Cr(VI) and TC are proposed.
The direct 2D/2D Z-scheme heterostructures of ZnIn2S4/Bi2MoO6 were rationally constructed by growing ZnIn2S4 ultrathin nanoflakes on the surface of Bi2MoO6 nanosheets, in situ, towards photocatalytic Cr(VI) reduction. After the tight...
Direct Z-scheme hierarchical heterostructures of O-doped g-C3N4/In2S3 were simply prepared, exhibiting efficient photocatalytic Cr(vi) reduction under visible light illumination.
The direct Z-scheme MgIn2S4/Bi2WO6 hierarchical heterostructures were elegantly fabricated via immobilising MgIn2S4 nanoflakes onto the surface of Bi2WO6 hierarchical nanosheet-like structures towards photocatalytic reduction of Cr(VI). The analyses of the...
The coexistence of heavy metals and antibiotics in modern wastewater causes unprecedented challenges to simultaneously eliminate these contaminants, resulting in the urgent demand for developing highly-efficient photocatalysts. Herein, we devised...
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