Lee, J. Seong, S. JIN, SOYEONG Jeong, Young do Noh, J. 2024-01-19T14:03:32Z 2024-01-19T14:03:32Z 2021-09-02 2021-08 1226-086X https://pubs.kist.re.kr/handle/201004/116668 A reusable and efficient photo-catalyst based on halloysites (HNTs) and La3+ ion-doped TiO2 nanoparticles was prepared using a sol-gel process and a sonochemical method for decomposing organic dyes. As a support, the HNTs increased the adsorption efficiency of substrates, improving the photocatalytic activity of TiO2 nanoparticles by ∼3 times. The La3+ ion doping of TiO2 decreased the bandgap from 3.25 eV to 3.01 eV, expanding the spectral response to the visible region and enhancing the photocatalytic activity under the sunlight by 1.5 times. Through the integration of the halloysite support and the La3+ ion doping of TiO2, the synergistic enhancement of photocatalytic activity was observed and systematically investigated using XRD, Raman spectroscopy, FT-IR, FE-SEM, EDX-TEM, and zeta potential. In this research, we used Rhodamine B molecules as a model pollutant. During the decomposing process, the HNTs enhanced the local dye concentration nearby the photo-catalyst through the electrostatic interaction, thereby boosting the photocatalytic activity by ∼3 times. Additionally, the catalyst can be separated by simple centrifugation and reused at least five recycles without any activity decrease. The halloysite support, the La3+ ion doping of TiO2 and their simple synthesis approach could provide a practical tool for environmental purification in wastewater using sunlight. ？ 2021 The Korean Society of Industrial and Engineering Chemistry English 한국공업화학회 Synergetic photocatalytic-activity enhancement of lanthanum doped TiO2 on halloysite nanocomposites for degradation of organic dye Article 10.1016/j.jiec.2021.05.029 1 Journal of Industrial and Engineering Chemistry, v.100, pp.126 - 133 Journal of Industrial and Engineering Chemistry 100 126 133 N scie scopus kci 000671222300011 2-s2.0-85108317843 Chemistry, Multidisciplinary Engineering, Chemical Chemistry Engineering Article Catalysts Image enhancement Ions Kaolinite Lanthanum Lanthanum compounds Nanoparticles Oxide minerals Rhodamine B Sol-gel process Sonochemistry TiO2 nanoparticles Titanium dioxide Adsorption efficiency Degradation of organic dyes Dye concentration Environmental purifications Sonochemical method Spectral response Synergistic enhancement Visible region Photocatalytic activity Halloysite Nanocomposite Nanotubes Photodegradation Re-usability TiO2 nanoparticle