Photoinhibition and photocatalytic response of surfactant mediated Pt/ZnO nanocomposite

Khalil Ur Rehman; Kamran Tahir; Hessah A Al-Abdulkarim; Ebraheem Abdu Musad Saleh; Abeer M Alosaimi; Mahmoud A Hussein; Afaq Ullah Khan; Zia Ul Haq Khan; Sadia Nazir; Umber Zaman

doi:10.1016/j.pdpdt.2021.102458

Photoinhibition and photocatalytic response of surfactant mediated Pt/ZnO nanocomposite

Photodiagnosis Photodyn Ther. 2021 Sep:35:102458. doi: 10.1016/j.pdpdt.2021.102458. Epub 2021 Jul 27.

Affiliations

¹ Institute of Chemical Sciences, Gomal University, D. I. Khan, KP, Pakistan.
² Institute of Chemical Sciences, Gomal University, D. I. Khan, KP, Pakistan. Electronic address: dr.kami.gu@gmail.com.
³ Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia.
⁴ Department of Chemistry, College of Arts and Sciences, Prince Sattam Bin Abdulaziz University, Wadi Al-Dawasir 11991, Saudi Arabia.
⁵ Department of Chemistry, Faculty of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia.
⁶ Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia,; Chemistry Department, Faculty of Science, Assiut University, Assiut, 71516 Egypt.
⁷ State Key Laboratory of Chemical Resource Engineering, School of Science, Beijing University of Chemical Technology, Beijing 100029, PR China.
⁸ Department of Environmental Sciences, COMSATS University Islamabad, Vehari Campus 61100, Pakistan.

PMID: 34325079
DOI: 10.1016/j.pdpdt.2021.102458

Abstract

Water pollution and bacterial resistance are universal problems. Drugs and protocols have been employed to deal with involved microbes and pollutants but these customary chemicals have many limitations. It is essential to produce new methods and materials to deal with these deleterious microbes. In the present contribution, highly efficient and stable nanocomposite of platinum activated zinc oxide was synthesized by a new plant extract and surfactant assisted protocol. The cetylpyridinium chloride was applied as surfactant to obtain high dispersion of spherical ZnO. The platinum ions were reduced on the ZnO surface by the use of Rhazya stricta plant extract. The prepared nanomaterial was used for photoinactivation of multidrug resistant bacterium Escherichia coli (E. coli). The synthesized nanomaterial showed strong E. coli inhibition efficiency in the presence of light and the observed diameter of zone of inhibition was 21 ±0.4. The effect of light on the inhibition of E.coli was studied by measuring the activated oxygen radicals inside the bacterium cell. The surface morphology of E.coli before and after treatment with Pt/ZnO was studied by SEM. Such effect was not observed in dark. The toxicity of the synthesized nanomaterials was also studied through haemolytic activity and the result shows that the nanomaterial prepared by the said method has very low toxicity. The photocatalytic degradation of methylene blue (MB) was also investigated in the presence of the synthesized nanomaterials. Effect of different parameters such as concentration of Pt/ZnO, Irradiation time and dye concentrations were also studied. An incredible photocatalytic deprivation of MB (98 %) was observed for Pt/ZnO nanocomposite as compared to individual Pt (48%) and ZnO (71%) nanoparticles after 5 minutes of irradiations. Further research is required to investigate the applications of Pt/ZnO nanocomposite.

Keywords: Cetylpyridinium chloride; Photodeprivation of MB; Photoinhibition of microbe; Pt/ZnO; Rhazya stricta.

MeSH terms

Catalysis
Escherichia coli
Nanocomposites*
Photochemotherapy* / methods
Photosensitizing Agents / pharmacology
Surface-Active Agents
Zinc Oxide*

Substances

Photosensitizing Agents
Surface-Active Agents
Zinc Oxide