TY - JOUR

T1 - Understanding the Role of ZnO Nanosheet Surface in Photocatalytic Dye Degradation: The Key to Effective Wastewater Treatment

AU - Мешина, Ксения Ильинична

AU - Ткаченко, Дмитрий

AU - Кочнев, Никита Дмитриевич

AU - Луньков, Святослав Сергеевич

AU - Панчук, Виталий Владимирович

AU - Кирсанов, Дмитрий Олегович

AU - Бобрышева, Наталья Петровна

AU - Осмоловский, Михаил Глебович

AU - Вознесенский, Михаил Андреевич

AU - Осмоловская, Ольга Михайловна

N1 - The work was financially supported by the Russian Science Foundation, project No. 23-23-00220, https://rscf.ru/en/project/23-23-00220/. Scientific research was performed at the research park of St. Petersburg State University: Centre for X-ray Diffraction Studies, Centre for Innovative Technologies of Composite Nanomaterials, Chemical Analysis and Materials Research Centre, Centre for Physical Methods of Surface Investigation, Centre for Physical Methods of Surface Investigation, Centre for Optical and Laser Materials Research, Interdisciplinary Resource Centre for Nanotechnology. In commemoration of the 300th anniversary of Saint Petersburg State University’s founding.

PY - 2024/6/25

Y1 - 2024/6/25

N2 - The current study proposes an introduction of interfering ions to the reaction medium as a simple way for obtaining efficient visible-light driven photocatalysts with active surface based on ZnO nanosheets. 9 samples with different morphological and structural parameters were obtained via simple and inexpensive precipitation and hydrothermal methods. XRD, SEM, FTIR, SSA, XPS, Raman, absorption spectra and DLS methods were used for ZnO nanosheet characterisation. An original approach was used to determine the amount of defects by processing Raman spectra via software specially designed for this purpose. XPS was used to estimate an overall amount of oxygen vacancies in the samples, and the DFT method was employed to model oxygen vacancies in the crystal structure. The latter were verified via absorption spectra. The most effective sample showed a dye degradation efficiency of 94 % after 60 min of irradiating by a common LED lamp available in a local store. The kinetic studies showed that the rate of adsorption and photodegradation depends on the DFT-calculated “surface-dye” interaction energy. Consequently, by regulating the ratio of ZnO nanosheet surface parameters, adsorption and photodegradation efficiency against a particular dye can be improved.

AB - The current study proposes an introduction of interfering ions to the reaction medium as a simple way for obtaining efficient visible-light driven photocatalysts with active surface based on ZnO nanosheets. 9 samples with different morphological and structural parameters were obtained via simple and inexpensive precipitation and hydrothermal methods. XRD, SEM, FTIR, SSA, XPS, Raman, absorption spectra and DLS methods were used for ZnO nanosheet characterisation. An original approach was used to determine the amount of defects by processing Raman spectra via software specially designed for this purpose. XPS was used to estimate an overall amount of oxygen vacancies in the samples, and the DFT method was employed to model oxygen vacancies in the crystal structure. The latter were verified via absorption spectra. The most effective sample showed a dye degradation efficiency of 94 % after 60 min of irradiating by a common LED lamp available in a local store. The kinetic studies showed that the rate of adsorption and photodegradation depends on the DFT-calculated “surface-dye” interaction energy. Consequently, by regulating the ratio of ZnO nanosheet surface parameters, adsorption and photodegradation efficiency against a particular dye can be improved.

KW - DFT

KW - Dyes

KW - Oxygen vacancies

KW - Photocatalysis

KW - Zinc oxide

UR - https://www.mendeley.com/catalogue/0be30f62-894c-30fa-ad04-e37549620395/

U2 - 10.1016/j.ceramint.2024.06.317

DO - 10.1016/j.ceramint.2024.06.317

M3 - Article

VL - 50

SP - 35103

EP - 35114

JO - Ceramics International

JF - Ceramics International

SN - 0272-8842

IS - 19 Part A

ER -