CHEMOSPHERE
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2020
·
IF 5.778
Shaohua She,Yifan Wang,Rong Chen,Futao Yi,Chuanzhi Sun,Jiayue Hu,Zhi Li,Gang Lu,Mingshan Zhu
The wide use and distribution of sulpiride (SP) has caused potential threats to the water environment and human health. In this study, ultrathin S-doped graphitic carbon nitride nanosheets (US–CN) was successfully synthesized and characterized, and its SP removal efficiency was evaluated under various conditions via the visible-light-assisted peroxydisulfate (PDS) activation method. The degradation pathways and mechanism were also discussed through quenching experiments, density functional theory (DFT) calculations, and intermediate products detection. After sulfur doping and ultrasonic treatment , graphitic carbon nitride (CN) possessed an ultra-thin and porous structure, which facilitated the electronic distribution and more photocurrent , thus resulting in the excellent stability and removal efficiency for SP via PDS activation upon visible light irradiation. The singlet oxygen ( 1 O 2 ) generated by the US-CN/PDS/VL system played a significant role in SP degradation. Based on the bonds of electron-rich atoms fracturing and the SO 2 extrusion, the SP degradation pathway was proposed. This work provides a useful information for the SP photocatalytic degradation via PDS activation.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Junnan Tao,Xiaohui Yu,Qinqin Liu,Guiwu Liu,Hua Tang
The requisite interfacial contact of heterojunction photocatalysts has a significant contribution in separation of interfacial charge carriers for photocatalytic hydrogen (H 2 ) evolution in a more efficient manner. Herein, an internal electric field (IEF)-induced S–scheme system comprised of two-dimensional (2D) CoAl layered double hydroxide (LDH) and 2D molybdenum disulfide (MoS 2 ) was constructed via a simple hydrothermal process. In the presence of visible-light irradiation, the 2D/2D MoS 2 /CoAl LDH hybrid demonstrates eightfold greater photocatalytic H 2 generation rate as compared with that of CoAl LDH. The mechanism was investigated in the light of the results of the X-ray photoelectron spectroscopy (XPS) and work-function calculated by density functional theory (DFT) simulation, and the improved activity was ascribed to that the rapid detachment of the electron-hole (e − -h + ) combinations and high redox ability, both are simultaneously realized in MoS 2 /CoAl LDH hybrid with a 2D/2D S–scheme charge transfer mechanism induced by the IEF across interface of the MoS 2 and CoAl LDH. Furthermore, favorable 2D/2D structure and better H* adsorption behavior of MoS 2 /CoAl LDH also promoted the improvement of water reduction performance. This work is a valuable guideline in developing of IEF-induced S–scheme photocatalysts with 2D/2D architecture for improved photocatalytic performance.
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高影响因子
Nanoscale
·
2020
·Vol. 12
·期 43
·22330-22339
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IF 6.895
Pengfei Liu,Yuanyuan Liu,Jing Li,Meiri Wang,Hongtao Cui
The microstructure of electrode materials and its synergism with current collectors have been a research focus in the area of Faraday supercapacitors (FSs), while the microstructure of current collectors has been neglected in most cases. To eliminate the electrochemical bottleneck of FSs, the comprehensive consideration on electrodes should simultaneously include both the microstructures of materials and current collectors, and their synergism. In this work, a dual nanostructure of NiCo2S4/nickel foam is built to achieve an electrode with structure-synergistical contribution from materials and current collectors. The as-built electrode presents an ultra-high rate capacity (1223.8 C g−1 at 2.5 A g−1; 53.40% capacity retention at an ultra-high current density of 148.5 A g−1) and excellent cycling stability (94.56% capacity retention after 10 000 charge–discharge cycles). The as-assembled asymmetrical supercapacitors show both high energy and power densities (76.7 W h kg−1 at 425.7 W kg−1; 41.9 W h kg−1 at 10 643.3 W kg−1). These results demonstrate that the dual nanostructure of the electrode is valuable for achieving high performance supercapacitors.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Feng Wei,Xinyu Cui,Zhao Wang,Changchang Dong,Jiadong Li,Xiaojun Han
Antibacterial agents with enzyme-like properties and bacteria-binding ability have provided an alternative method to efficiently disinfect drug-resistance microorganism. Herein, a Fe 3 O 4 @MoS 2 -Ag nanozyme with defect-rich rough surface was constructed by a simple hydrothermal method and in-situ photodeposition of Ag nanoparticles. The nanozyme exhibited good antibacterial performance against E. coli (~69.4%) by the generated ROS and released Ag + , while the nanozyme could further achieve an excellent synergistic disinfection (~100%) by combining with the near-infrared photothermal property of Fe 3 O 4 @MoS 2 -Ag. The antibacterial mechanism study showed that the antibacterial process was determined by the collaborative work of peroxidase-like activity, photothermal effect and leakage of Ag + . The defect-rich rough surface of MoS 2 layers facilitated the capture of bacteria, which enhanced the accurate and rapid attack of OH and Ag + to the membrane of E. coli with the assistance of local hyperthermia. This method showed broad-spectrum antibacterial performance against Gram-negative bacteria, Gram-positive bacteria, drug-resistant bacteria and fungal bacteria. Meanwhile, the magnetism of Fe 3 O 4 was used to recycle the nanozyme. This work showed great potential of engineered nanozymes for efficient disinfection treatment.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Jiali Tang,Jiling Zhao,Shixing Wang,Libo Zhang,Minghu Zhao,Zhen Huang,Yuting Hu
In this study, a novel metal organic framework (MOF) was prepared by pre-modification strategy and used as adsorbents to recover palladium ions in wastewater. The characterization indicates that the adsorbents have been successfully synthesized. The effects of various factors on the adsorption behavior of the adsorbents for Pd(II) was studied. Experimental research shows that the optimal pH of the adsorption process is 4.0. The adsorption kinetics and isotherms of Pd(II) on the adsorbents show that it conforms to pseudo-second-order and Langmuir models, respectively. Therefore, the adsorption reaction is a single layer adsorption on the uniform surface of the adsorbent, and chemical adsorption is the main rate-limiting step. According to thermodynamic analysis, the adsorption process is entropiezunahme, spontaneous and endothermic. The adsorption mechanism of Pd(II) on the adsorbents is mainly through the electrostatic action and chelation of Pd(II) with N and O atoms, and the reduction of Pd(II) to Pd(0) by N and O functional groups. The adsorbents can selectively uptake palladium ions from multi-ion wastewater, and after five adsorption–desorption cycles, the adsorption efficiency is still high. This new adsorbent has a wide application prospect in the field of palladium ion separation.
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ENVIRONMENTAL POLLUTION
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2020
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IF 6.793
Xinghua Zhao,Jing Li,Shuyong Mu,Wei He,Dan Zhang,Xia Wu,Chuanyi Wang,Hehua Zeng
The exploitation of a new adsorbent with a high adsorption performance and recyclability is of great practical significance for the treatment of wastewater containing mercury ions. In this study, a novel membrane adsorbent was fabricated by blending MoS 2 nanosheets into a PVDF polymer matrix (P-PVDF/MoS 2 ) followed by non-solvent-induced phase conversion. This material was able to bind mercury ions and was not affected by the solution ionic strength, co-existing anions, or interfering heavy metal ions . The optimal pH range for mercury ion elimination was 4.5–6.0, and P-PVDF/MoS 2 exhibited a maximum adsorption capacity of 578 mg g −1 . The pseudo-second-order adsorption kinetics and Langmuir isotherm models best described the adsorption process. The adsorption mechanism was mainly monolayer chemisorption , for which the S groups were the major active sites. Furthermore, the membrane could be removed from the aqueous solution easily using tweezers, and the removal efficiency of mercury ions remained over 90% after ten cycles. This study suggests that the inexpensive and recyclable P-PVDF/MoS 2 membranes can be used for the efficient removal of heavy metal ions from wastewater at a large scale.
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ChemCatChem
·
2020
·Vol. 12
·期 24
·6401-6409
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IF 4.853
Yuhang Du,Yufei Lu,Hongjian Zhang,Zhentao Nie,Zhicheng Sun,Congying Han,Ruizi Li,Jixin Zhu
Graphical Hierarchical benefits : A three-dimensional hierarchical arrays structure assembled from nanosheets based on nickel foam was obtained by a simple soft chemical synthesis method. The composite was employed as the electrode of water splitting device to generate hydrogen and exhibited favorable hydrogen evolution efficiency, which benefits from the novel structural design and the synergistic effect of two components of Ni 3 S 2 and LDHs in the hydrogen evolution reaction. Designing an electrocatalyst with optimized structure and performance is vital for the electrolysis of water to produce hydrogen. Herein, a three-dimensional (3D) hierarchical composite electrode material is proposed for alkaline hydrogen evolution reaction (HER), consisting of Co−Al hydroxides (CoAl-LDHs) nanosheets decorated with vertically aligned nickel sulfide (Ni 3 S 2 ) arrays (Ni 3 S 2 @CoAl-LDHs/NF). The as-obtained electrocatalyst displays a minimum overpotential of 175 mV at 10 mA cm −2 toward HER. Electrochemical impedance spectroscopy and Tafel slope further reveals outstanding kinetics in the electrolysis process. The catalytic performance of the electrode can still maintain 90 % capacity after 1000 CV cycles. The outstanding properties of the composite material benefits from its unique 3D hierarchical structure, which promote plentiful active sites and faster electronic transfer rate. This work sheds lights on the current research of noble-metal-free electrocatalysts and the design of overall water splitting.
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Journal of Materials Chemistry A
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2021
·Vol. 9
·期 11
·7122-7128
·
IF 12.732
Yukun Sun,Xupeng Zong,Dan Qu,Ge Chen,Li An,Xiayan Wang,Zaicheng Sun
Solar water evaporation is a sustainable and efficient way to produce fresh water. Identifying highly efficient photothermal materials is an important step for achieving high evaporation rates. However, the effects of the water interfacial area are rarely paid any attention, although a few reports have demonstrated high evaporation rates from micro-/nanostructured devices. In this work, we introduce a new term, water mass per unit surface area (WMUA), to connect the water mass and interfacial area. We can regulate WMUA using different commercial porous materials to realize water management in devices, which further affects the evaporation rates. The optimized device is composed of suedette sponge, filter paper, and polydopamine as the water-transportation, water-restrictive, and photothermal materials, respectively, and it achieves an evaporation rate of 1.8 kg m−2 h−1 and energy efficiency of ∼92%. This presents a new strategy for the rational design of device structures and the promotion of evaporation rates, pushing this field into new areas.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Meng Li,Jingxue Sun,Bowen Cong,Shunyu Yao,Gang Chen
The optical and electronic properties of plasmonic semiconductor nanomaterials have attracted a lot of attention. In this study, sulfur vacancies was regulated to achieve carriers density of 10 17 ~ 10 23 cm −3 , with the characteristics of localized surface plasmon resonance (LSPR). Since the excitation of LSPR, the plasma electrons on the semiconductor surface are elevated to a higher energy state. These electrons can overcome the energy barrier between BS and Cd 0.5 Zn 0.5 S (CZS), directly transferred to the conduction band (CB) CZS components as electron donor. This effect may cause more electrons on the semiconductor CB to react with H 2 O to generate more hydrogen. By calculating the Debye length, the scale of the charge effect in the plasma is measured. It can be proved that LSPR is instrumental in the available separation of electrons and holes in semiconductors, and significantly improves the hydrogen production effect of CZS/BS-1.5 nanocomposites. This research furnishes new insights for the construction of efficient and novel polyphase photocatalysts.
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Advances in Materials Science and Engineering
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2020
·
IF 1.271
Xuan-Dung Mai,Yen Thi Hai Phan,Van-Quang Nguyen
Solid assemblies of carbon quantum dots (CQDs) are important for diverse applications including LEDs, solar cells, and photosensors; their optical and electrical properties have not been explored yet. Herein, we used amphiphilic CQDs synthesized from citric acid and thiourea by a solvothermal method to fabricate CQD solid films. Optical properties of CQDs studied by UV-Vis and photoluminescence spectroscopies indicate that CQDs possess three different emission centers at 425 nm, 525 nm, and 625 nm originating from C sp2 states, N-states, and S-states, respectively. In a solid state, π-π stacking quenched the blue emission, while the red emission increased. Importantly, CQD films exhibited excitation independence, which is important to design solid-state lighting applications.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 45
·期 3
·1231-1239
·
IF 3.288
Jiajia Li,Yun Zhao,Xiuxun Han,DingShu Xiao
The design of highly efficient and stable photoelectrocatalysts for the hydrogen evolution reaction (HER) is critical to the large-scale application of clean hydrogen energy. Here, Cu3BiS3 nanoflowers (NFs) with photoelectrochemical (PEC) activity were synthesized via a solvothermal method under mild and low-toxic reaction conditions, and the Au nanoparticles (Au NPs) were loaded onto Cu3BiS3 NFs to improve the photoelectrocatalytic performance. Compared with pure Cu3BiS3 NFs, Au-Cu3BiS3 composites (A@C) exhibit a much higher photocurrent density (2 × 10−4 A cm−2) and greatly enhanced photoelectrocatalytic activity (2.31 μmol h−1), which are attributed to the enhancement in electron capture abilities, active sites and visible light absorption from the localized surface plasmon resonance effect (LSPR) of Au NPs. Furthermore, the excellent conductivity of Au NPs can effectively accelerate the separation and collection of photogenerated carriers. This work highlights a feasible strategy to improve the PEC activity of the Cu3BiS3 photoelectrocatalyst, and confirms the great potential of Au-Cu3BiS3 composites for hydrogen evolution applications.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Liyuan Duan,Guoqiang Li,Shuting Zhang,Hongyu Wang,Yongle Zhao,Yongfa Zhang
In this study, graphitized carbon nitride photocatalysts were successfully prepared by using the desulfurized waste liquid extracting salt from coking plants. The NO x removal efficiency of g-C 3 N 4 synthesized using ammonium thiocyanate (NH 4 SCN), ammonium thiosulfate ((NH 4 ) 2 S 2 O 3 ) and ammonium sulfate ((NH 4 ) 2 SO 4 ) with different mass ratios were evaluated. The results showed that due to the addition of (NH 4 ) 2 S 2 O 3 and (NH 4 ) 2 SO 4 a large amount of sulfur-containing gas was released during pyrolysis, which significantly increased the specific surface area and pore volume of the photocatalysts. The release of sulfur-containing gas also resulted in the incorporation of sulfur, and due to this doping process the band gap of the photocatalyst was widened to 2.94 eV, thus enhancing its visible light response. C vacancies were formed in the hepazine ring, which increased the electron density around the N–(C) 3 bridge bond and formed an electron trapping center, thus inhibiting the recombination of charge carriers. The photocatalysts had increased O 2 adsorption capacity and increased number of amino groups on their surface. This facilitated the rapid generation and consumption of reactive oxygen species, inhibited the accumulation of NO 2 on the surface, reduced the production of NO 2 , thus improving the NO x removal efficiency of the photocatalysts. The principle of using “waste for waste control” was achieved, and a new method for nitrogen oxide removal was provided.
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