Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·123793
·
IF 7.5
Hao Cai,Tianyuan Guan,Shuo Yang,Changyu Lu,Zhijia Miao,Aifang Gao,Zichuan Ma
Metronidazole (MNZ) poses a significant environmental challenge due to its high bio-resistance and environmental persistence, resulting in refractory residues that are difficult to eliminate via traditional biochemical methods. Although ZnO-ZnS heterojunctions can facilitate charge separation, the traditional Type-II migration pathway inevitably directs photogenerated carriers toward energy bands with weaker redox potentials. This results in a redox potential compromise that severely limits the intrinsic reaction kinetics of the system, particularly in neutral environments. To address this critical issue, we developed a novel ZnO-ZnS@Biochar (HZSBC) heterojunction using straw biochar as an economical carbon host. The contribution of this work lies in discovering that interface-anchored persistent free radicals (PFRs) function as non-metallic solid-state electron relays. By inducing directional charge shuttling, these PFRs circumvent the aforementioned potential compromise, thereby establishing a Z-scheme charge transfer pathway that preserves exceptional redox capabilities. Via a dual-site anchoring-in situ transformation strategy, high-density oxygen-centered PFRs (spin concentration reaching 20.05 ×10 17 spins/g) were precisely engineered at the HZSBC interface, providing stable electron relay channels for the Z-scheme mechanism. Consequently, HZSBC achieved 90.2% MNZ removal within 110 min under neutral conditions (pH 7.0) with only 8 mM H 2 O 2 , exhibiting an apparent rate constant of 1.01 × 10 −2 min −1 and maintaining over 80% removal efficiency after five consecutive cycles. By overcoming the thermodynamic limitations of photocatalysis via PFRs-mediated interfacial band engineering, this work not only offers a new paradigm for the design of high-performance Z-scheme catalysts but also provides an ideal technical pathway for the deep coupling of advanced oxidation processes with downstream biological treatment units.
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高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 32
·9856-9864
·
IF 6.641
Di Yin,Ming-Liang Wang,Ying-Zi Wang,Xun Hu,Bo Liu,Hong Liu,Lulu Ma,Guang-Gang Gao
A ternary nanocomposite containing ZnO, ZnS and MoS2 (ZnMoNCs) has been firstly synthesized by Keggin-type polyoxomolybdate and ZIF-8 as starting materials to provide Mo and Zn sources simultaneously. As compared to the mono- or bi-component complex, ZnMoNCs present more sensitive and stable surface-enhanced Raman scattering (SERS) activity. When rhodamine 6G is used as a probing molecule, the detection limit of 10−9 mol L−1 can be achieved on the ZnMoNC substrate with the enhancement factor (EF) of 1.4 × 108, which is the highest sensitivity among the known semiconductor SERS substrates. The increased adsorption sites and the synergistically improved charge transfer are conducive to the large enhancement of the SERS activity. It was also proved that the ZnMoNC substrate possesses high stability and self-cleaning properties, and can be reused in SERS detection without losing its activity even after 5 cycles. This work paves a new way to the design of new semiconductor SERS substrates by the utility of a multicomponent complex.
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高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 23
·e202201469
·
IF 9.14
Jing Peng,Guorui Liu,Xianhui Jiao,Hongqiang Xia,Jing Li,Qingxiang Ma,Jun Jin,Feng Li
Graphical Gloves on : A ZnO/ZnS/ZnIn 2 S 4 (ZnO/ZnS/ZIS) photoanode is fabricated by simple but effective sequential ion-exchange reactions. The prepared coaxial “glove” structure photoanode facilitates protection of the inner layer of ZnO, simultaneously boosting charge separation and the oxygen evolution reaction kinetics and achieving a stable photocurrent density of 1.146 mA cm −2 at 1.2 V RHE , approximately 2-fold higher than that of pristine ZnO. Serious degradation and the short photogenerated carrier lifetime for the wide-bandgap semiconductor ZnO have become prominent issues that negatively affect photoelectrochemical (PEC) water splitting. Herein, a novel electron transport pathway was constructed by simple but effective coaxial growth of ZnO/ZnS/ZnIn 2 S 4 heterostructure nanoarrays to increase the carrier separation efficiency. This new photoanode fulfilled the requirements of both favorable band alignment and stability, achieving a stable photocurrent density of 1.146 mA cm −2 at 1.2 V RHE , which was approximately twice that of pristine ZnO. Detailed experimental studies revealed that the improved PEC activity was due to the lattice-matching interface coherency that activated the carrier transport pathway, giving rise to an optimized interfacial electronic structure for promoted charge separation by the built-in electric field and strengthened water oxidation activity. This design may provide a new approach to fabricating various efficient lattice-matching coherent interface photoanodes for PEC water splitting.
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Dandan Ma,Jian-Wen Shi,Diankun Sun,Yajun Zou,Linhao Cheng,Chi He,Hongkang Wang,Chunming Niu,Lianzhou Wang
A new type of Au nanoparticles (NPs) decorated hollow flower-like ZnO@ZnS (HZOS) heterostructure (HS) is elaborately designed as efficient photocatalyst for water splitting application. The optimal Au decorated HZOS exhibits a high hydrogen generation rate of 569.81 μmol/h (10 mg of catalyst), which is 345, 374 and 11 times higher than that of pristine ZnO (1.65 μmol/h), ZnS (1.52 μmol/h) and ZnO@ZnS (51.7 μmol/h), respectively. Furthermore, its apparent quantum efficiency reaches to 25.47% at the wavelength of 365 nm. The significantly enhanced H 2 evolution can be attributed to the synergistic effects from the hollow channel structure and the deposited Au NPs. The hollow channel creates a new migration pathway where charge carriers can transfer towards the hollow channel in addition to the outer surface of the photocatalyst, thus significantly reducing the migration distance of charge carriers, suppressing the recombination of photogenerated electrons and holes, and reducing their transfer resistance. The decoration of Au NPs at the interface between ZnO and ZnS not only facilitates the directional migration of charge carriers because of the formation of Schottky barrier, but also works as electron shuttles to form a Z-scheme transfer process, effectively promoting the separation and migration of charge carriers.
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高影响因子
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