The photocatalytic degradation of antibiotic pollution under visible light is significant for environmental protection. However, developing photocatalysts that exhibit strong responsiveness to visible light, along with high efficiency and stability, poses a substantial challenge. In this study, we have successfully constructed Cd/CdS-ZnFe2O4/α-Fe2O3 heterostructured photocatalysts. ZnFe2O4/α-Fe2O3 nanoparticles would grow on the surface of Cd/CdS, which forms the Z-Scheme heterostructure. The samples were characterized by structure, morphology, elemental and electrochemical analysis. The results show that the Cd/CdS-ZnFe2O4/α-Fe2O3 catalyst has reached 91.72% tetracycline degradation performance in the photo-Fenton reaction. Through the experimental results and the energy band position, the internal Z-scheme heterojunction reaction mechanism of improving photo-Fenton degradation performance was proposed. This research would contribute to advancing the rational design and synthesis of heterojunction photocatalysts for efficient antibiotic removal under visible light.

Photoelectrocatalytic (PEC) could effectively and gently treat wastewater. Nonetheless, catalysts face the pronounced tendency of sluggish photogenerated carrier transfer and carrier recombination. In this paper, we herein fabricate FeOOH/BiVO 4 photoanode through the incorporation of a cocatalyst FeOOH onto the BiVO 4 surface. This modified photoanode demonstrated improved performance when coupled with peroxomonosulfate (PMS) for the purpose of oxidizing tetracycline hydrochloride (TCH) within the PEC system. In the presence of 0.3 mM PMS, the degradation efficiency of TCH increased from 65 % to 88 % within 60 min. The effects of PMS concentration, applied voltage and TCH concentration on the decomposition were studied in detail. Through free radical scavenging experiments, it was found that SO 4 center dot- , h + and & sdot;OH played an important role in TCH degradation. In addition, the FeOOH/BiVO 4 with PMS activation in the PEC system also could be capable of dealing with some more organic pollutants (antibiotics and dyes) and achieving good degradation effect. More importantly, TCH degradation rate by FeOOH/BiVO 4 photoanode is still over 80 % after five cycles of reuse. This work provides a promising approach for the synthesis of novel photoanodes in the PEC systems with excellent PEC properties in removing environmental pollutants.

Photocatalysis-Fenton degradation of antibiotic pollutants is an attractive avenue, but its practical application is limited by easy recombination of photocarriers and low efficiency of Fe3+/Fe2+ cycling. This work intends to introduce aloe-emodin into FeOOH with the purpose of improving the carrier separation rate by organic-inorganic heterojunction, as well as promoting the iron cycle (Fe3+/Fe2+) transformation and inhibiting Fe3+ precipitation in photocatalysis-Fenton through its complexation and reducibility, so as to achieve efficient degradation of antibiotic pollutants. Conspicuously, the prepared aloe-emodin/FeOOH sample showed nearly 85% tetracycline (TC) removed within 1 h with visible light and H2O2, which was almost 2.02 and 2.12 times larger than those of aloe-emodin and FeOOH, separately. The superior degradation performance ascribed to the synergistic effect of the aloe-emodin and FeOOH in the presence of H2O2 as a strong oxidant. Moreover, the paper is focused on the effects of aloe-emodin/FeOOH interface structural characteristics on transmission modes of carriers and surface catalytic kinetics. The generated & BULL;OH, & BULL;O2  and 1O2 could serve as the active species achieving relatively high efficiency of Fe3+/Fe2+ cycling and rapidly photogenerated charge separation in the degradation progress. Finally, we have tried to illustrate the internal mechanism of photocatalysis-Fenton treatment of antibiotic pollutants by aloe-emodin/FeOOH. Additionally, these investigations will provide prac-tical and technical support for further exploitation of similar organic-inorganic photocatalysts, which is expected to accelerate the development of photocatalysis-Fenton degradation in the field of environmental purification.

The exploitation of magnetic recyclable and effective degradation photocatalysts with wide-pH-range response was essential to the practical application in the photo-Fenton process. In this study, Cd/CdS coupling with CuO/Fe2O3/CuFe2O4(CF) was employed to prepare an efficient and recyclable photocatalyst Cd/CdS-CuO/Fe2O3/CuFe2O4(CCCF). The obtained CCCF was utilized to activate H2O2 for the photo-Fenton degradation of tetracycline after verifying optical properties and energy band structures. The photo-Fenton degradation performance of CCCF on tetracycline was researched in the effects of photocatalyst concentration, initial pH and H2O2 volume. The photo-Fenton removal efficiency of CCCF+H2O2 was capable of achieving 82.43 % under the optimal reaction condition, which was apparently higher than that of Cd/CdS and CF. The enhanced degradation efficiency could be owned to the effective carriers separation thanks to the p-n heterojunction. The development of such photocatalysts offers a new approach to degrading organic pollutants from industrial wastewater, making it a valuable tool for contaminants degradation.

Photoelectrochemical (PEC) water splitting can convert the inexhaustible solar energy into green and storable H2 to tackle fossil crisis and meet carbon neutrality. BiVO4 is regarded as a promising photoanode owing to its superior visible light absorption, moderate redox potentials and well chemical stability, but suffering from the rapid recombination of charge carriers and sluggish interfacial water oxidation kinetics. Herein, a heterostructured CoFe1.5Cr0.5S3O/COFs/BiVO4 photoanode was fabricated to accelerate charge carriers & PRIME; separation and boost water oxidation. The spinel-type CoFe1.5Cr0.5S3O serving as the co-catalyst enabled to largely lower the overpotential of water oxidation, while COFs acting as an interlayer passivated the interfacial defect between CoFe1.5Cr0.5S3O and BiVO4. Benefiting from the collaboration of CoFe1.5Cr0.5S3O co-catalyst and COFs interlayer, heterostructured CoFe1.5Cr0.5S3O/COFs/BiVO4 photoanode featuring with a prominent charge extraction efficiency reached an impressive water oxidation photocurrent of 5.1 mA cm-2 at 1.23 V vs. RHE under AM 1.5 G irradiation, higher than that of pristine BiVO4, binary COFs/BiVO4 and CFCOS/BiVO4 photoanodes. This work demonstrated that heterostructured BiVO4-based photoanode with co-catalyst and interlayer enables to simultaneously enhance charge carrier utilization efficiency and optimize surface catalysis kinetics for efficient solarto-fuel conversion.

Bicycle transportation is a green and environmentally-friendly travel mode with unique advantages in the development of urban transportation and plays an important role in alleviating urban traffic congestion and reducing environmental pollution, especially in tourist cities. Based on relevant literature and the analysis of the current status of domestic bicycle traffic development, this paper proposes a quadratic exponential smoothing method for demand forecasting, a P-middle model for site planning, and a fuzzy comprehensive evaluation method. The method for planning and designing the public bicycle network in an urban scenic spot was conducted using the Datang Furong Garden as site.

造价指标是工程造价管理工作中一个重要研究方向.基于重庆、中山及芜湖等地跨坐式单轨工程实例,对工程基础数据进行标准化修正后,初步建立了跨坐式单轨工程造价指标体系.结合所选工程实际造价数据,将造价指标分为总造价指标、综合造价指标和分项造价指标,对各造价指标及费用比例进行了对比分析,总结了跨坐式单轨造价指标的特点与规律,研究结果可为跨坐式单轨工程造价工作提供一定参考.