查找使用阿拉丁产品的科研文献

Enhanced oxygen electroreduction over nitrogen-free carbon nanotube-supported CuFeO2 nanoparticles

Shu-Yu Zhao,Bing Zhang,Hui Su,Jun-Jun Zhang,Xin-Hao Li,Kai-Xue Wang,Jie-Sheng Chen,Xiao Wei,Pingyun Feng

Composites of nano-sized delafossite CuFeO2 with 10–20 nm diameter and carbon nanotubes (CNTs) are constructed through a facile, one-pot hydrothermal process. The obtained nitrogen-free composites demonstrate promising electrocatalytic activity for the oxygen reduction reaction (ORR) in alkaline media. The introduction of CNTs facilitates the formation of nano-sized CuFeO2 particles. The synergistic effect between the nanosized delafossite CuFeO2 and carbon nanotubes endows the composites with a high electron transfer ability contributing to their robust ORR performance in 0.1 M KOH. This synthetic approach represents a promising method for the preparation of non-precious metal based electrocatalytic materials.

The synthesis and microstructure of CuFeO2 powders via microwave hydrothermal reaction

Jinze ZHAI,Hongchao WANG,Wenbin SU,Teng WANG,Xue WANG,Tingting CHEN,Chunlei WANG

Optimizing photoelectrocatalytic Efficiency: Synergistic activation of peroxymonosulfate by CuFeO2/BiVO4 composites for antibiotic removal

Yonglei Xing,Jingyao Duan,Duomin Wang,Xiaoyong Jin,Xin Wang,Rui Yang,Gang Ni

The BiVO 4 photoanode and CuFeO 2 materials were synthesized via electrodeposition and hydrothermal methods, respectively, and the p-n type 2-CBVO (CuFeO 2 /BiVO 4 ) composite photoanode was prepared using a spin-coating technique. The degradation performance of the composite photoanodes was evaluated in a PEC-coupled PMS (peroxymonosulfate) activation system using levofloxacin (LVF) as the target pollutant. The 2-CBVO photoanode achieved a degradation efficiency of 78.8 % for LVF (15 ppm) within 30 min, representing a 45.1 % improvement over the BiVO 4 photoanode. The pseudo-first-order rate constant for the degradation of LVF was determined to be 4.43 × 10 −1 min −1 . Photoelectrochemical analysis confirmed that CuFeO 2 loading and PMS introduction enhanced photogenerated carrier separation, promoting LVF degradation. Radical trapping experiments indicated that h + , OH, SO 4 − and O 2 − were the primary reactive species in the degradation process. Both theoretical calculations and experimental results confirmed that the internal electric field at the composite interface directs from BiVO 4 to CuFeO 2 , facilitating electron transfer from CuFeO 2 to BiVO 4 and onward to the cathode surface via the external circuit. Cyclic stability tests demonstrated that the 2-CBVO composite photoanode retained 90.0 % of its activity after five cycles, indicating excellent stability and significant potential for water treatment applications.

Structurally integrated lignin-derived biochar/CuFeO2 aerogel for salt-resistant solar-driven interfacial evaporation and wastewater purification

Yaopeng Pu,Na Jin,Yuyu Wang,Yulong Ma,Feng Lin,Yonggang Sun

The growing scarcity of freshwater demands sustainable and efficient purification technologies. Although solar-driven interfacial evaporation offers a low-energy solution, existing photothermal materials frequently suffer from limited light absorption, salt accumulation, and limited functionality. To address these challenges, we designed and fabricated a bifunctional bilayer aerogel evaporator using lignin-derived biochar and cellulose. The fabricated evaporator comprised a bottom hydrophilic cellulose aerogel for efficient water transport and a top carbonized lignin layer, which demonstrated broad-spectrum light absorption (>89 %) and effective solar-to-thermal conversion. Furthermore, CuFeO 2 photocatalysts were integrated onto the biochar via hydrothermal synthesis, endowing the evaporator with pollutant degradation capability. This performance is attributed to the strong interfacial electron transfer between the multi-metal redox cycle and the carbon carrier. Under 1 kW m −2 irradiation, the device achieved a 2.19 kg m −2 h −1 evaporation rate and 94.52 % solar-to-vapor efficiency, alongside robust salt resistance and a 78.4 % tetracycline degradation rate. Outdoor tests confirmed that the evaporator retained a high evaporation rate of 2.06 kg m −2 h −1 and degraded 92.1 % of pollutants in wastewater under actual, low-intensity sunlight, thereby underscoring its practical potential. This work therefore presents an integrated design that offers a promising strategy for efficient solar water purification and wastewater treatment.

Insights into efficient activation of H2O2 by sulfur-doped CuFeO2: Important role of sulfur and sulfamethoxazole oxidation

Shuangyuan Liu,Xinyu Li,Yubei Xiong,Ting Wang,Cong Pan,Chuanyin Liu,Ping He,Shilong Li

In the field of advanced oxidation processes, the efficient activation of hydrogen peroxide (H 2 O 2 ) plays a crucial role in the degradation of organic pollutants. Herein, sulfur-doped CuFeO 2 (S-CuFeO 2 ) was synthesized and exhibited enhanced catalytic activity for sulfamethoxazole (SMX) degradation via H 2 O 2 activation. Sulfur incorporation into the CuFeO 2 lattice modulates the electronic structure and surface properties, thereby facilitating H 2 O 2 activation and promoting O O bond cleavage and the generation of highly reactive oxygen species (ROSs). Combined quenching experiments, electron spin resonance (ESR), X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations reveal that hydroxyl radicals (HO • ) and superoxide radicals (O 2 •− ) dominate the SMX degradation in oxidation process. In addition, the S-CuFeO 2 /H 2 O 2 system demonstrates good stability, low metal leaching, and effective performance in different water matrices and for various organic pollutants. Toxicity evaluation further indicates a reduction in overall toxicity during degradation. This work provides mechanistic insight into H 2 O 2 activation by sulfur-doped catalysts and offers a feasible strategy for designing efficient catalysts for antibiotic-contaminated wastewater treatment. Download: Download high-res image (199KB) Download: Download full-size image

Scalable Reduced Graphene Oxide Conductive Layer-Based Particulate Photocathodes for Photoelectrochemical Water Splitting

Ruiyuan Sun,Qinglu Liu,Qitao Liu,Weilong Qin,Jiabo Le,Xiaopei Ren,Muhammad Bilal Akbar,Yang Zhou,Chonghan Xia,Licheng Sun,Yongbo Kuang

Particle transfer method photoelectrodes show superior photoelectrochemical performance compared to traditional powder-based methods, making them a promising solution for solar water splitting in sustainable energy. This study introduces an innovative nonvacuum particle transfer method for fabricating photoelectrodes on a conductive carbon substrate, addressing the challenges associated with the high costs and vacuum deposition processes of traditional methods. Utilizing a p-type CuFeO 2 powder semiconductor, a unique substrate is developed by applying a graphene oxide layer mixed with a small amount of silica binder on the particle layer's backside through ultrasonic atomization spraying. This layer is converted into multilayered reduced graphene oxide (ML-rGO) via wet chemical reduction, resulting in a substrate boasting a high work function (4.8 eV), alongside remarkable chemical stability, mechanical strength, and conductivity. The fabricated CuFeO 2 photocathode demonstrated an onset potential of 0.97 V versus RHE and a photocurrent density of 1.5 mA cm −2 at 0.6 V versus RHE for H 2 O 2 reduction. Further enhancement is achieved by depositing Pt as a cocatalyst, which ensured stability for over 20 h in an alkaline medium for water splitting. This study sets a new benchmark for developing CuFeO 2 -based photocathodes, paving the way for broader particle transfer method applications.

Highly efficient activation of peroxymonosulfate by the (3R + 2H)-CuFeO2 nanocomposite photocatalyst: Intermediate toxicity, BVS validation ionic migration and degradation pathway

Bo He,Zixuan Zhao,Lixian Song,Weibao Liu,Ying Yang,Jiangwei Shang,Xiuwen Cheng

The degradation of carbamazepine (CBZ) by activated peroxymonosulfate (PMS) using the (3R + 2H)-CuFeO 2 nanocomposite photocatalyst was investigated in this work. The (3R + 2H)-CuFeO 2 were prepared by hydrothermal method at 160°for 15 h utilizing ferrous sulphate heptahydrate (FeSO 4 ·7H 2 O) and copper (II) sulphate (CuSO 4 ·5H 2 O) as raw materials. Meanwhile, the (3R + 2H)-CuFeO 2 was characterized and analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), isothermal nitrogen adsorption (BET), and X-ray energy spectroscopy (EDS). The best removal effectiveness was 85.96% when critical factors such as the starting pH value, catalyst dosage, and PMS quantity were turned. The action of anions was then investigated further. The high catalytic efficiency was due to the synergistic impact of Fe 3+ /Fe 2+ and Cu 2+ /Cu + redox cycles. The plausible CAZ breakdown routes were postulated based on the results of the liquid chromatograph-mass spectrometer (LC-MS). Finally, we have studied the most probable of cation migration by the 3DBVSMAPPER program and BVEL calculation concept to correlate the structural characteristics of both materials and their ionic conductivity . The formed channel shows the uniform transport of ions, which can optimize the solid–liquid interface, hinder the influence of water molecules on the material, and protect the material.

Enhanced acetaminophen degradation by photoelectro-persulfate system with 3D nanostructured PbO2/Sb-SnO2//blue-TiO2//WO3 bifacial photoanode and Mo-CuFeO2/CF cathode

Weishan Qin,Ting Su,Guodong Chai,Xinhong Wang,Weichao Qin,Hongbin Yu

Photoelectrocatalysis is a promising method for removing biorefractory organic pollutants. However, the inefficient utilization of light and electricity by photoanodes and the failure to effectively execute cathode functions typically lead to poor degradation performance. Therefore, in this study, a photoelectrocatalytic (PEC) system coupled with electro-activated persulfate (E-PS) was constructed using a 3D nanostructured PbO 2 /Sb-SnO 2 //blue-TiO 2 //WO 3 bifacial anode and a Mo-CuFeO 2 -modified carbon felt cathode. The results indicate that the bifacial anode could effectively implement electro-assisted photocatalysis on the irradiating side and electrocatalysis on the back side. This significantly accelerated acetaminophen degradation with a synergy index of 48.98 %. Additionally, the PEC/E-PS system was established by combining a bifacial anode with a persulfate-activated cathode, which promoted the efficient utilization of photogenerated electrons and increased the number of active species in the coupled system. Density functional theory calculations confirmed that Mo tended to dope the Fe sites and promote the adsorption of PS on Mo-CuFeO 2 , facilitating the continuous activation of persulfate. In the coupled system, the contribution order of different active species to acetaminophen degradation was h +  >  OH > SO 4 −  >  1 O 2  >  O 2 − . Their mutual conversion enabled the PEC/E-PS system to efficiently remove acetaminophen with a relatively high current efficiency (22.69 %) and low energy consumption (0.06 kWh⋅gCOD −1 ). The proposed PEC/E-PS system is an efficient and sustainable method for treating organic contaminants in wastewater.