We can work on Sampling theory

Describe sampling theory and provide examples to illustrate your definition. Discuss generalizability as it applies to nursing research.

Sample Solution

decomposition of MCs [22,23]. The photocatalysis has also been suggested as an effective approach for the treatment of toxic polluted waters including toxins [24,25]. Many materials such as TiO2, ZnO, ZrO2, CdS, MoS2, Fe2O3, WO3, and their various combinations have been examined as photocatalysts for the organic and inorganic pollutants degradation [26]. Among them, semiconductor nanostructures with superior optical and physicochemical characteristics are used for environmental applications. These materials due to exclusive electronic structure act as photocatalysts for photochemical reactions in presence of light [27]. The photon energy required for the photo-excitation of semiconductors depends on their band gap [28]. The region of between the valence band (VB) and the conduction band (CB) is the band gap [29]. TiO2 is one of the semiconductor photocatalysts that because of its chemical stability, chemical inertness, non-toxicity, low cost, and strong oxidizing ability is most interested [30-33], but despite of its desirable properties, because to having of large band gap (~3.2 eV) activates only in the UV light region [27,34]. Therefore, the formation of heterojunction structures between TiO2 and a narrow band gap semiconductor can efficiently extend the photosensitivity of TiO2 into the visible region [35]. Using photocatalysts with a narrow band gap that active in visible-light irradiation is interested recently. Many visible light active photocatalysts that have good photocatalytic performance are CdS, CdSe, WO3, AgVO4, Bi2WO6, BiVO4, and etc [36]. Bismuth vanadate (BiVO4) is a low-cost semiconductor that has attracted special great attention for the organic pollutants degradation [37,38]. BiVO4 compounds have been prepared in three crystalline phases including monoclinic and tetragonal scheelite, and tetragonal zircon. Monoclinic form with the band gap~2.4 eV has the best photocatalytic performance in visible-light region [39-43]. Bismuth-bas>

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