查找使用阿拉丁产品的科研文献

Self-assembled hierarchical and bifunctional MIL-88A(Fe)@ZnIn2S4 heterostructure as a reusable sunlight-driven photocatalyst for highly efficient water purification

Ranran Yuan,Jinli Qiu,Cailiang Yue,Chen Shen,Dawei Li,Changqing Zhu,Fuqiang Liu,Aimin Li

Hierarchical MIL-88A(Fe)@ZnIn 2 S 4 heterostructures were synthesized via a facile low-temperature solvothermal method. The combination of MIL-88A(Fe) and ZnIn 2 S 4 produced excellent photocatalytic properties under sunlight irradiation. The enhanced separation efficiency of the photogenerated charge carriers facilitated the optimal photocatalytic performances of 12.5%-HMIL@ZIS, with 100% the of hexavalent chromium (Cr(VI)) and 99.6% of the sulfamethoxazole being converted within 9 min and 60 min at pH 5, respectively. The kinetic rate constants of Cr(VI) reduction (0.5864 min −1 ) and sulfamethoxazole (SMZ) degradation (0.0958 min −1 ) were approximately 15 and 5 times larger than those previously reported. The formation of ·O 2 − could promote the super-high conversion of Cr(VI). Meanwhile, the synergetic effect of 1 O 2 and ·O 2 − played a dominant role in the degradation of sulfamethoxazole. Furthermore, the satisfactory photocatalytic performances could be maintained after four cycles. This work provides new insights into the design of metal-organic framework based photocatalysts and indicates the great potential for efficient purification of actual wastewater.

Visible light-activated 1-D core-shell paramagnetic Fe-Ag@AgCl as an innovative method for photocatalytic inactivation of E. coli

Cui Yanping,Thathsarani Nimesha,Peng Liang,Gao Ya,Lei Lidan,Zhou Zhengwei,Liang Lili,Shi Xiaoyan

Innovative paramagnetic one-dimensional (1-D) core-shell Fe-Ag@AgCl visible light-driven photocatalysts are synthesized through a template-assisted electrodeposition method trailed by FeCl 3 in-situ oxidation. The metallic nature of Fe-Ag@AgCl is confirmed through scanning electron microscopy (SEM) and crystal nature through X-ray diffraction (XRD). The controllable diameter of Fe-Ag is obtained through the selection of hollow size of the polycarbonate (PC) template. Electron impedance spectroscopy (EIS) confirms through the introduction of Fe to the Ag core that has prolonged the recombination of electron and hole. Escherichia coli ( E. coli ) are employed as the target bacteria to evaluate the photocatalytic disinfection performances. A total of 1.30 mg of Fe-Ag@AgCl is proved to be able to completely inactivate 10 7  CFU (colony forming units)/mL after 120 min of visible light irradiation. The transition electron microscopy (TEM) confirms the stability of the material after the photo reaction. As Fe-Ag@AgCl possesses magnetic properties, the material is recovered through the application of an external magnetic field. SEM images and results of 3D emission extraction matrix (EEM) depict that the bacteria cell death is caused by membrane permeability changes caused by the reduction of membrane associated proteins.

Preparation of the Mn-Fe-Ce/γ-Al2O3 ternary catalyst and its catalytic performance in ozone treatment of dairy farming wastewater

Jiayao Li,Weifeng Song,Zefeng Yu,Qiuhua Li

The quality of dairy farming wastewater in different regions is particular and different. In Southern China, the Chemical Oxygen Demand (COD Cr ) and colourity of effluent from conventional dairy farming wastewater treatment processes are similar. Catalytic ozonation is a very promising technical method. In this paper, the Mn-Fe-Ce/γ-Al 2 O 3 catalyst was prepared via the optimized preparation method of impregnation roasting using γ-Al 2 O 3 as the carrier, and this catalyst was used in the ozonation of actual dairy farming wastewater from treatment facilities. The performance of the Mn-Fe-Ce/γ-Al 2 O 3 catalyst on dairy farming wastewater was investigated using a simulated dynamic test. The effects of the reaction time, pH and catalyst dosage on COD Cr and the colourity removal ratio were investigated. The results show that the optimum treatment conditions were a reaction time of 20 min, pH 9, and catalyst dosage of 15 g/L. The COD Cr removal ratio reached 48.9% and the colourity was 95% under the optimum conditions. BOD 5 /COD Cr increased from 0.21 to 0.54 after catalytic ozonation, indicating that the biodegradability of wastewater was significantly improved. This research provides a new method and theoretical guidance for dairy farming wastewater treatment.

Improvement of low-temperature NH3-SCR catalytic performance over nitrogen-doped MOx–Cr2O3–La2O3/TiO2–N (M = Cu, Fe, Ce) catalysts

Xiaoyi Sun,Qingjie Liu,Shuai Liu,Xintang Zhang,Shanshan Liu

A series of MOx–Cr2O3–La2O3/TiO2–N (M = Cu, Fe, Ce) catalysts with nitrogen doping were prepared via the impregnation method. Comparing the low-temperature NH3-SCR activity of the catalysts, CeCrLa/Ti–N (xCeO2–yCr2O3–zLa2O3/TiO2–N) exhibited the best catalytic performance (NO conversion approaching 100% at 220–460 °C). The physico-chemical properties of the catalysts were characterized by XRD, BET, SEM, XPS, H2-TPR, NH3-TPD and in situ DRIFTS. From the XRD and SEM results, N doping affects the crystalline growth of anatase TiO2 and MOx (M = Cu, Fe, Ce, Cr, La) which were well dispersed over the support. Moreover, the doping of N promotes the increase of the Cr6+/Cr ratio and Ce3+/Ce ratio, and the surface chemical adsorption oxygen content, which suggested the improvement of the redox properties of the catalyst. And the surface acid content of the catalyst increased with the doping of N, which is related to CeCrLa/TiO2–N having the best catalytic activity at high temperature. Therefore, the CeCrLa/TiO2–N catalyst exhibited the best NH3-SCR performance and the redox performance of the catalysts is the main factor affecting their activity. Furthermore, in situ DRIFTS analysis indicates that Lewis-acid sites are the main adsorption sites for ammonia onto CeCrLa/TiO2–N and the catalyst mainly follows the L–H mechanism.

Enhancing degradation of atrazine by Fe-phenol modified biochar/ferrate(VI) under alkaline conditions: Analysis of the mechanism and intermediate products

Yu Cao,Shanqing Jiang,Xudong Kang,Hankun Zhang,Qiuya Zhang,Liping Wang

In this study, Fe-phenol modified biochar was prepared to enhance atrazine (AT) degradation by ferrate (Fe(VI)) under alkaline conditions, and the properties, mechanism and transformation pathways were extensively investigated. Degradation experiments showed that Fe-phenol modified biochar was more beneficial for improving the oxidation capacity of Fe(VI) than unmodified biochar, and the biochar with a molar ratio of Fe 3+ to phenol of 0.1:5 (BC-2) showed the best promoting effect, and more than 94% of AT was removed at pH = 8 within 30 min. Moreover, the rate of oxidation ( k app ) of AT by Fe(VI) increased 1.86 to 4.11 times by the addition of BC-2 in the studied pH range. Fe(Ⅴ)/Fe(Ⅳ) and ·OH were the main active oxidizing species for AT degradation in the Fe(VI)/BC-2 group and contributed to 70% and 24%, respectively, of degradation. The formation of ·OH and Fe(Ⅴ)/Fe(Ⅳ) was mainly due to the persistent free radicals and reducing groups on the surface of BC-2. AT was oxidized to 12 intermediate products in the Fe(VI)/BC-2 group through 5 pathways: alkyl hydroxylation, dealkylation, dichlorination, hydroxylation, alkyl dehydrogenation and dichlorination. Compared with those of the initial solution, the total organic carbon content and toxicity after the reaction decreased by 32.8% and 19.02%, respectively. Therefore, the combination of Fe-phenol modified biochar and Fe(VI) could be a promising method for AT removal.

Rapid degradation of p-arsanilic acid and simultaneous removal of the released arsenic species by Co–Fe@C activated peroxydisulfate process

Zhendong Yu,Jiachen Ma,Jinlan Dai,Shiyu He,Xiaoyi Huang,Yuancai Lv,Yifan Liu,Chunxiang Lin,Junfeng Chen,Minghua Liu

In this study, a bimetallic composite catalyst (Co–Fe@C) was fabricated with calcination at high temperature (800 °C) by using Co-MIL-101 (Fe) as the precursor. The characterization results showed that the resulted Co–Fe@C composite mainly consisted of carbon, FeCo alloys, Fe 3 O 4 , Co 3 O 4 and FeO, and owned evident magnetism. In addition, the Co–Fe@C was employed to activate the peroxydisulfate (PDS) to degrade a representative organic pollutant ( p -arsanilic acid, p -ASA) and the main factors were optimized, which involved 0.2 g L −1 of catalyst dosage, 1.0 g L −1 of PDS dosage and 5.0 of initial pH. Under the optimal condition, Co–Fe@C/PDS system could completely degrade p -ASA (20 mg L −1 ) in 5 min. In the Co–Fe@C/PDS system, SO 4 − · , Fe(IV) and ·OH were the main species during p -ASA degradation. Under the attack of these species, p -ASA was first decomposed into phenols and then transformed into the organics acids and finally mineralized into CO 2 and H 2 O through a series of reactions like hydroxylation, dearsenification, deamination and benzene ring opening. Importantly, most of the released inorganic arsenic species (93.40%) could be efficiently adsorbed by the catalyst.

Designing Multifunctional Co and Fe Co-Doped MoS2 Nanocube Electrodes for Dye-Sensitized Solar Cells, Perovskite Solar Cells, and a Supercapacitor

Chang Xu,Wenlu Yang,Jiaxin Zhao,Jingyuan Ma,Mingxing Wu

In the present study, three types of specific solid, core–shell, and hollow structured cobalt and iron co-doped MoS2 nanocubes (denoted as s-Co-Fe-MoSx, c-Co-Fe-MoSx, and h-Co-Fe-MoSx) are controllably synthesized for the first time by regulating the reactant mass ratios. The prepared Co-Fe-MoSx nanocubes can function as a counter electrode in dye-sensitized and perovskite solar cells (DSCs and PSCs) and a working electrode in a supercapacitor. In the DSC system, the c-Co-Fe-MoSx nanocubes exhibit the maximum catalytic activity to the Co3+/2+ redox couple regeneration, and the device achieves a power conversion efficiency (PCE) of 8.69%, significantly higher than the devices using s-Co-Fe-MoSx (6.61%) and h-Co-Fe-MoSx (7.63%) counter electrodes. Similarly, all of the prepared Co-Fe-MoSx nanocubes show decent activity in PSCs and the device using the c-Co-Fe-MoSx counter electrode achieves the highest PCE of 6.88%. It is worth noting that, as the supercapacitor working electrode, the h-Co-Fe-MoSx exhibits a specific capacitance of 85.4 F g–1, significantly higher than the parallel values achieved by the s-Co-Fe-MoSx and c-Co-Fe-MoSx electrodes under identical conditions.

Universal Strategy to Prepare a Flexible Photothermal Absorber Based on Hierarchical Fe-MOF-74 toward Highly Efficient Solar Interfacial Seawater Desalination

Jiulong Wang,Weike Wang,Jianguo Li,Xueyang Mu,Xinyue Yan,Zerui Wang,Jinbu Su,Tao Lei,Chengbing Wang

Solar-driven interfacial steam generation (SDISG), as an emerging green and renewable approach to overcome water shortage, is very suitable for remote locations, developing countries, and disaster zones because it does not require an additional energy supply. However, the traditional metal-based and carbon-based absorbers always suffered from fragility (or rigidity) and the complex preparation process, which dramatically inhibited their transportation and installation in areas with poor infrastructure. Therefore, there is an urgent need to develop a universal method to fabricate flexible solar evaporators. Herein, a novel solar evaporator that integrates a flexible matrix (Cu mesh or textile) and a hierarchical Fe-MOF-74 photothermal absorber component is perfectly prepared for the rapid and efficient SDISG. Notably, the results show that Fe-MOF-74-based flexible textile matrix composites exhibit outstanding light absorption (83.81%), low thermal conductivity (0.1730 W/m K), super hydrophilic properties (within 50 ms, the contact angle is close to 0°), excellent salt resistance, high evaporation rate (1.35 kg/m2 h), and photothermal conversion efficiency (η is 81.5% under one sun, stable for 30 days). Owing to the flexibility, recyclability, and above-mentioned excellent performance, the prepared hierarchical Fe-MOF-74-based flexible composite systems are more practical for transportation, large-scale production, and stable and efficient applications. As a result, this work offers new insight into the future development of the combination of a MOF-based photothermal absorber and flexible substrates, as well as for the application of interfacial solar seawater desalination, and provides a new reference for other applications.

Colorimetric immunoassays based on pyrroloquinoline quinone-catalyzed generation of Fe(II)-ferrozine with tris(2-carboxyethyl)phosphine as the reducing reagent

Ning Xia,Dehua Deng,Xiangsheng Mu,Ang Liu,Jiaxun Xie,Dandan Zhou,Ping Yang,Yun Xing,Lin Liu

This work reported a novel redox cycling in which pyrroloquinoline quinone (PQQ) promoted the reduction of Fe(III)-ferrozine by tris(2-carboxyethyl)phosphine (TCEP). Specifically, PQQ was reduced into pyrroloquinoline quinol (PQQH 2 ) by TCEP, and then the produced PQQH 2 reduced colorless Fe(III)-ferrozine into dull red Fe(II)-ferrozine. The redox cycling was employed for development of colorimetric immunosensors through the generation of colorful Fe(II)-ferrozine. Mesoporous silica nanoparticle (MSN) was used as the carrier for both PQQ and recognition antibody through electrostatic interactions. Magnetic bead (MB) was used as the support for the immobilization of capture antibody. After the sandwich-type immunoreactions and magnetic separation, the MSN-PQQ nanolabels on the MB surface triggered the production of Fe(II)-ferrozine. The limit of detection was found to be 1 pg/mL with prostate specific antigen (PSA) as the model target. The result for the analysis of serum sample is in agreement with that achieved by the commercial enzyme-linked immunosorbent assay kits. The proposed immunosensor obviated the use of enzyme molecules for signal amplification and did not require expensive instruments for signal readout. This work should be valuable for the design of novel nanolabels and the proposed sensing strategy by the redox cycling could be applied to develop more sensitive biosensors.

Efficient peroxymonosulfate activation by Zn/Fe metal–organic framework-derived ZnO/Fe3O4@carbon spheres for the degradation of Acid Orange 7

Xiao Zhang,Jing Zhang,Xue Huang,Qing Ping Wu,Chun Hui Yan,Jin Feng Lu

ZnO/Fe 3 O 4 @carbon spheres, which synthesized via a calcination process used Zn/Fe metal–organic frameworks (Zn/Fe–MOFs) as a precursor, were studied for the activation of peroxymonosulfate (PMS) for the degradation of Acid Orange 7 (AO7). The ZnO/Fe 3 O 4 @carbon spheres exhibited relatively high catalytic degradation properties for AO7 in an aqueous solution. The AO7 degradation reached 93.6% in 15 min under the conditions: 0.20 g/L ZnO/Fe 3 O 4 @carbon spheres, 1.25 mmol/L PMS, 0.03 mmol/L AO7, and initial pH of 4. Findings revealed that higher ZnO/Fe 3 O 4 @carbon spheres dose and PMS concentration, lower initial AO7 concentration, and acidic pH favored the AO7 degradation to a certain extent. The mechanisms for the activation of PMS by ZnO/Fe 3 O 4 @carbon spheres were proposed based on the results of radical identification tests and structure characterization. Both radical and nonradical pathways contribute to the AO7 degradation in this system. Practitioner points PMS + ZnO/Fe 3 O 4 @carbon spheres system can effectively catalyze PMS to decompose AO7. Both radical and nonradical pathways contribute to the degradation of AO7 in this system. The acidic condition was favorable for the activation of PMS.

Targeted Fe-doped silica nanoparticles as a novel ultrasound–magnetic resonance dual-mode imaging contrast agent for HER2-positive breast cancer

Xiaoyu Li,Shujun Xia,Wei Zhou,Ri Ji,Weiwei Zhan

Synthesis of catalytically active peroxidase-like Fe-doped carbon dots and application in ratiometric fluorescence detection of hydrogen peroxide and glucose

Dan Zhu,Shujuan Zhuo,Changqing Zhu,Ping Zhang,Weili Shen

In this study, we have presented a novel strategy to fabricate fluorescent Fe-doped carbon dots (Fe-CDs) by one-step hydrothermal carbonization, using methylthymol blue sodium salt (MTB) and FeCl3·6H2O as precursors. Multiple techniques were employed to characterize the properties of the obtained Fe-CDs. Importantly, the intrinsic peroxidase-like activity of the Fe-CDs was explored. Through catalyzing the oxidization of o-phenylenediamine (OPD) by hydrogen peroxide (H2O2), the Fe-CDs exhibited a superior catalytic performance over horseradish peroxidase (HRP) attributed to the doped Fe elements in the Fe-CDs. By the combination of favorable fluorescence properties and excellent catalytic activities, Fe-CD based ratiometric fluorescence sensing systems toward H2O2 and glucose have been designed in view of the inner filter effect (IFE) between Fe-CDs and 2,3-diaminophenazine (DAP, the oxidation product of OPD). Such responses can be used for well quantifying H2O2 and glucose in the ranges of 0–133 μM and 0–300 μM with detection limits of 0.47 and 2.5 μM (S/N = 3), respectively. The proposed sensing system has been successfully used for the assay of glucose in human serum samples, indicating great promise as a practical platform for blood glucose sensing.