Xingzhi Wang,Zhuang Wang,Xishun Jiang,Miao Zhang,Yanfen Wang,Jianguo Lv,Gang He,Zhaoqi Sun
Highly ordered TiO2 nanorod (TNR) arrays decorated with Cu2ZnSnS4 (CZTS) nanocrystals were prepared via a facile and effective method. The TNR arrays were synthesized using a hydrothermal treatment, and the CZTS nanocrystals were deposited by a three-step successive ionic layer adsorption and reaction (SILAR) technique followed by annealing in a sulfur atmosphere. The morphology, structure, composition, optical, and the photoelectrochemical (PEC) properties of the CZTS/TNR arrays were investigated in detail. The results demonstrate that the CZTS/TNR arrays can effectively facilitate photoinduced carrier transport, reduce the recombination rate of electron-hole pairs, and as a result demonstrate improved light absorption properties and PEC performance. The CZTS/TNR arrays sensitized with 7 SILAR cycles showed a maximal photocurrent density of 2.17 mA/cm2 at 0 V and the longest electron lifetime of 47.39 ms, which is nearly 80 and 2.03 times higher than those of pure TNR, respectively. The improvement in performance can be attributed to the high absorption coefficient and narrow bandgap of CZTS and the type-II nanoheterostructures with a staggered alignment of band edges present at the heterointerface. Surface passivation with ZnS resulted in a further improvement in PEC performance in comparison to the untreated CZTS/TNR arrays with values of 2.53 mA/cm2 and 59.77 ms for the maximal photocurrent density and longest electron lifetime, respectively.
Zhengyu Ding,Jun Zhang,Zheyao Xia,Binjie Xin,Jiali Yu,Xiaoyuan Lei
The textile industry encounters serious environmental challenges from wastewater with persistent organic pollutants, demanding sustainable solutions for remediation. Herein, we report a novel green synthesis of flexible BiOBr@PZT nanocomposite membranes via electrospinning and successive ionic layer adsorption and reaction (SILAR) for visible-light-driven photocatalytic degradation. The hierarchical structure integrates leaf-like BiOBr nanosheets with PAN/ZnO/TiO2(PZT) nanofibers, forming a Z-scheme heterojunction. This enhances the separation of photogenerated carriers while preserving mechanical integrity. SILAR-enabled low temperature deposition ensures eco-friendly fabrication by avoiding toxic precursors and cutting energy use. Optimized BiOBr@PZT-5 shows exceptional photocatalytic performance, achieving 97.6% tetracycline hydrochloride (TCH) degradation under visible light in 120 min. It also has strong tensile strength (4.29 MPa) and cycling stability. Mechanistic studies show efficient generation of O2−and OH radicals through synergistic light absorption, charge transfer, and turbulence-enhanced mass diffusion. The material’s flexibility allows reusable turbulent flow applications, overcoming rigid catalyst limitations. Aligning with green chemistry and UN SDGs, this work advances multifunctional photocatalytic systems for scalable, energy-efficient wastewater treatment, offering a paradigm that integrates environmental remediation with industrial adaptability.
危险品化学品经营许可证（带存储）