Photocatalytic degradation of 2,4-D and 2,4-DP herbicides on Pt/TiO2 nanoparticles

Review on heterophase/homophase junctions for efficient photocatalysis: The case of phase transition construction

“…The regulation and control of the crystal type includes two aspects: one of them is the achievement of the mixed crystal for the enhanced charge separation, and the other is the identification of the temperature-dependence law or the externally induced synthesis of the phase transition. Numerous facile, low-cost, and energy efficient techniques of phase transformations, such as ion doping [113,114], oxide regulations [115,116], wet chemical or solution-phase methods [117][118][119][120], pressure-induced phase transitions [121,122], calcination-induced phase transitions [123][124][125], self-induced self-surface phase junctions [126,127], pulse laser irradiation or UV/ozone-assistants [128,129], mechanical alloying [130], molten salt auxiliary [131], and electrochemistry methods [132,133], have been extensively developed to fabricate heterojunctions/homojunctions. A large number of experimental studies have defined some of these laws that possess increased significance for the rational design of the crystal structure, the guidance of the synthesis, and the optimization of the catalytic performance of the catalyst [134].…”

Occurrence and transformation of phenoxy acids in aquatic environment and photochemical methods of their removal: a review

“…The efficiency of phenoxy acid phototransformation can be enhanced through exposure to UV radiation in combination with H 2 O 2 (Shu et al 2013;Martinez et al 2016;Semitsoglou-Tsiapou et al 2016;Adak et al 2019). Hydrogen peroxide is photolysed under exposure to UV light in an acidic environment, which leads to the generation of hydroxyl radicals ( · OH) with high oxidation potential (Klamerth et al 2012).…”

“…According to Farre et al (2005), Agustina et al (2005), and Rajeswari and Kanmani (2009), the addition of ozone to the UV/TiO 2 system intensifies the generation of hydroxyl radicals. Giri et al (2008) analyzed the photoactivity of TiO 2 fiber during 2,4-D degradation (45 μM; pH~4.3) under exposure to UV radiation (λ = 254 nm) and ozone (2 mg L −1 min −1 ) ( Rivas et al 2015) or modified with metal nanoparticles (Abdennouri et al 2015;Lee et al 2017) is also used. In this way, photocatalysts with enhanced UV activity or visible activity are obtained.…”

Photocatalytic removal of 2,4-Dichlorophenoxyacetic acid from aqueous solution using tungsten oxide doped zinc oxide nanoparticles immobilised on glass beads

“…Pesticides are compounds used in pest control [2]; 2,4dechlorophenoxyacetic acid (2,4-D), which is a common and toxic pesticide, is categorised as a phenoxy acetic acid compound with weak aromatic characteristics [3]. The derivatives of 2,4-D pesticide are widely used worldwide for eliminating broadleaf weeds in agriculture, parks, and meadows [4].…”

“…In photocatalytic processes, cost-effective, non-toxic and highly stable chemical catalysts are applied; besides, sunlight can be used as a cheap source of radiation [13]. Among photocatalysts used for environmental application, ZnO and TiO 2 are now the most frequently used photocatalytic nanomaterials [3]. Zinc oxide has a band gap (3.2 eV) similar to titanium dioxide [14] and its role has been demonstrated in a number of studies [8,14].…”