Recycling waste textiles for the synthesis of δ-MnO2/C catalysts with full-light conversion to highly photothermal oxidation indoor formaldehyde

• Published in: Separation and purification technology 2025-04, Vol.356, p.129891, Article 129891
• Main Authors: Wang, Jun, Liu, Linhui, Li, Qian, Liu, Ruixin, Zheng, Yi, Hou, Li’an, Wang, Wenjun, Chen, Jianmeng
• Format: Article
• Language: English
• Subjects: Formaldehyde; Photothermal catalysis; Resource recycling; Waste textile; δ-MnO2
• ISSN: 1383-5866
• DOI: 10.1016/j.seppur.2024.129891

[Display omitted] •The incorporation of waste textile biochar with many trace elements facilitated inner electron transfer.•The coupling of δ-MnO2/C improved the photothermal synthetic efficiency for CH2O removal.•Superoxide anion radicals (•O2−) was the main ROS work in this catalyst to mineralize CH2O.•Catalysts prepared from waste textiles demonstrated significant and pragmatic value in terms of resource recycling. The growth of the textile industry has brought about increasingly abundant waste textiles annually. However, traditional treatment would cause serious soil, water and air contamination. Herein, waste textiles biochar was used to accelerate the in-situ growth of δ-MnO2 to prepare δ-MnO2/C photothermal catalysts with efficient electron transfer. The loading of transition metal oxide δ-MnO2 facilitate light and heat absorbance of finished catalyst, and its outstanding 2D structure effectively promoted the generation of active sites. The catalysts prepared from silk fiber biochar and 0.4 mol/L KMnO4 solution (MSI-0.4) exhibited the best photothermal catalytic activity and the degradation efficiency of formaldehyde (CH2O) could reach up to 86.9 % (± 3.4 %) with only 27 min irradiation. It could be attributed to the doping of vast trace elements and the existence of abundant Ovac, accelerating the separation of photogenerated e-/h+ and the redox cycle of Mn ions. Thus, more ROS could be generated to degrade CH2O into CO2 and H2O. This study paved way for reutilizing waste textile to synthesize photothermal catalyst with high activity to remove indoor CH2O.