Bi₂O₂CO₃/Bi₂O₃ Z-scheme photocatalyst with oxygen vacancies and Bi for enhanced visible-light photocatalytic degradation of tetracycline

Abstract

Since it has been found that tetracycline (TC) causes significant harm to ecosystems and human health, there has been an intense commitment toward its effective remediation in the ambient environment....

In situformation of Cu2O decorated CuZnAl-layered double hydroxide heterostructured photocatalysts for enhancing the degradation of tetracycline under visible light

“…The TC ( m / z = 445) decreases with increasing light and then disappears, while the photodegradation of the TC can be described by the three main pathways. 10,18,45,59 Pathways I, P1 ( m / z = 417) are the primary intermediates in TC demethylation. It can form the intermediate P2 ( m / z = 480) by removing double bonds and an open ring.…”

“…Due to dehydration and the C–O bondlysis, P15 ( m / z = 279) was generated by P14. 10,18,45,59 On the whole, the TC was gradually degraded by a combination of ˙O 2 − , ˙OH and h + eventually resulting in a series of small molecule compounds such as CO 2 , H 2 O, and NH 4 + by Cu 2 O/CuZnAl-LDHs catalysts.…”

“…1–6 Concerns have recently been raised around the world about the great threat to human health posed by the heavy use of antibiotics, since they have been widely detected in aquatic environments such as surface water, ground water, sewage water, and even drinking water. 3,7–11 As a typical antibiotic, tetracycline (TC) is usually excreted into surface water and manure as an unmetabolized compound. 5,6,12,13 Accordingly, it is important to find efficient and cost-effective ways to degrade TC from various types of contaminated water.…”

Calcination-Induced Oxygen Vacancies Enhancing the Photocatalytic Performance of a Recycled Bi2O3/BiOCl Heterojunction Nanosheet

“…However, BBOC-1 exhibited much lower reaction activity, with only 46.81% adsorption in the dark and 69.97% total removal rate of RhB under the same reaction conditions. In addition, the pseudo-first-order kinetic model (ln­( c t / c 0 ) = kt ) was used to further describe RhB photodegradation, where k represented the kinetic constant, c t and c 0 were the concentrations of RhB in aqueous solution at time t and 0, respectively. − The fitted kinetic model curves and the apparent rate constant k of the kinetic equation are illustrated in Figure b,c. BBOC possessed the maximum k value of 0.05228 min –1 , which is 3.7, 2.1, and 71.3 times higher than those BBOC-1 (0.01428 min –1 ), BOC (0.02495 min –1 ), and BO (0.00073 min –1 ).…”

Highly efficient photocatalytic degradation over rose-like 1D/2D La(OH)3/(BiO)2OHCl heterostructures boosted by rich oxygen vacancies and enhanced interfacial charge transfer

“…18,19 However, the construction of heterojunctions with two semiconductors having matched band energy structures can dramatically promote the spatial separation and transfer of photogenerated electron-hole pairs, thereby enhancing the photocatalytic activity. [20][21][22][23][24] In particular, flower-like heterostructures assembled by binary or ternary semiconductor heterojunctions have gained great research interest due to the joint advantages from both morphology control and heterojunction construction. 16,25 For example, Etogo et al controllably synthesized BiOCl/(BiO) 2 -CO 3 /Bi 2 O 3 heterostructures with a flower-like morphology, which showed remarkably enhanced photocatalytic degradation efficiency towards organic pollutants, as compared with the mechanical mixture of (BiO) 2 CO 3 , Bi 2 O 3 , and BiOCl.…”