Studies on the removal of acid violet 7 dye from aqueous solutions by green ZnO@Fe3O4 chitosan–alginate nanocomposite synthesized using Camellia sinensis extract

Recent Achievements in Photocatalytic Degradation of Organic Water Contaminants

“…ZnO-Fe 3 O 4 nanoparticles were synthesised using the leaves of Camellia sinensis and immobilised in crosslinked alginate-chitosan polymer beads, and tested for photocatalytic degradation of acid violet 7 (AV7) dye. 55 The optimisation of reaction conditions ensured higher dye removal efficiency up to 94.21 ± 1.02 % using the nanocomposite under UV-C irradiation of 365 nm. The removal efficiency in tap water, groundwater, and lake water was 83.2 ± 0.4 %, 69.1 ± 1.6 %, and 67.9 ± 0.3 %, respectively.…”

Synergistic photocatalytic removal of moxifloxacin from aqueous solutions using ZnO-Fe3O4-chitosan composites

“…Incorporating chitosan into the nanocomposite serves dual purposes: it bolsters the environmental safety of the material and introduces functional groups capable of interacting with pollutant molecules, thereby potentially augmenting the adsorption capacity of the composite [28,29]. The chitosan fraction plays a pivotal role in the overall adsorption dynamics of the nanocomposite, enabling the preconcentration of pollutant molecules at the catalyst interface [30]. This pre-concentration phenomenon potentially amplifies the photodegradation efficiency by fostering more robust interactions between the pollutants and the photocatalytic sites.…”

“…The integration of chitosan into the Fe 3 O 4 and ZnO nanocomposite thus not only elevates the environmental suitability and photocatalytic prowess of the material but also confers practical benefits in terms of recyclability and reusability. The unique composition of the chitosan-Fe 3 O 4 -ZnO composite (CMZ) harnesses the synergistic effects of robust photocatalytic properties of ZnO, magnetic separability of Fe 3 O 4 , and high adsorption capacity of chitosan, offering a multifaceted approach to water treatment [30,33]. Unlike conventional photocatalytic systems, which primarily rely on UV activation and often suffer from low adsorption capacities and challenging recovery processes [17], CMZ material shows enhanced photocatalytic degradation of MFX under both UV and visible light, facilitated by the improved separation of electron-hole pairs and an increased reactive surface area.…”

Characterization and photocatalytic properties of ZnO - Fe3O4 composite

“…Sau một khoảng thời gian phản ứng (90 phút), trên bề mặt vật liệu MZ hình thành nhiều hợp chất trung gian và các hợp chất trung gian này cạnh tranh vị trí hấp phụ với kháng sinh nên làm tốc độ phân hủy kháng sinh LFX giảm[16]. Xu hướng này cũng đã được báo cáo trong một số nghiên cứu trước đó về quá trình quang xúc tác phân hủy các chất hữu cơ, như sự phân hủy của phenol và axit benzoic trên ZnO[16], phân hủy kháng sinh sunfamethazole trên TiO2[17], phân hủy chất màu axit violet 7 bởi nanocompozit ZnO@Fe3O4 chitosan-alginate[18], phân hủy Rhodamine B bởi nanoflowers N-doped MoS2[19]. Kết quả này có thể giải thích bởi hai nguyên nhân.…”