ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 42
·63233-63247
·
IF 5.19
Ma Mingliang,Chen Yan,Jiang Jiabin,Bi Yuxin,Liao Zijian,Ma Yong
Excessive discharge of toxic dyes is detrimental to ecological system and human health. Therefore, an effective photocatalyst must be designed and developed to degrade dyes from wastewater. Herein, a novel one-dimensional (1D) flower-like recoverable ZnFe 2 O 4 /C/MnO 2 /BiOI magnetic composite photocatalyst was synthesized via electrospinning technique combined with hydrothermal method. The photocatalytic activities of composite photocatalyst were evaluated by degrading methyl orange (MO) and Rhodamine B (RhB) under simulated light irradiation. The efficiency of ZnFe 2 O 4 /C/MnO 2 /BiOI photocatalyst in visible light for 150 min reached 91% (MO) and 120 min reached 94% (RhB). Moreover, the degradation rate of MO still remained 78% after five cycles. The design of 1D magnetic flower-like composite provided a new strategy for preparing photocatalysts possessing excellent photocatalytic efficiency and cyclic stability.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 52
·期 4
·1009-1020
·
IF 4.569
Min Pan,Ning Wang,Zhenting Weng,Xuehua Zou,Xiaoming Huang
A heterogeneous Fenton-like system comprising palygorskite/MnO2/Fe3O4 (PMM) as a superior, low-cost, and eco-friendly ternary catalyst for the activation of peroxymonosulfate (PMS) was investigated with regard to its ability to degrade Acid Scarlet GR in an aqueous solution. Under the optimum catalytic oxidation conditions of 1 g L−1 PMM, 0.7 g L−1 PMS, and an initial pH value of 5, 200 mg L−1 Acid Scarlet GR was completely degraded within 300 min. PMM exhibited outstanding magnetic recovery ability and reusability after nine cycles with a degradation efficiency of up to 95.4%. The PMM catalyst had a broad working pH range. Singlet oxygen 1O2 was considered to play the principal role in the degradation of Acid Scarlet GR in the PMM/PMS system. The synergistic effect between MnO2, Fe3O4, and PG substantially accelerated the catalytic activity of PMM, and MnO2 was identified to be the primary active site. These findings indicate that PMM is a nanocatalyst that can efficiently activate PMS for the treatment of dye-containing wastewater.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2024
·Vol. 16
·期 8
·1115
·
IF 4.7
Zhigong Zheng,Ronghui Shi,Xiaoping Zhang,Yonghao Ni,Hui Zhang
Tetracycline (TC) is a common antibiotic; when untreated TC enters the environment, it will cause a negative impact on the human body through the food chain. In the present study, MnO2/MCM-41@Fe3O4(FeMnMCM) prepared using a hydrothermal and redox method andCamellia oleiferashell-activated carbon (COFAC) prepared through alkali activation were encapsulated using alginate (ALG) and calcium chloride as a cross-linking matrix to give the composite beads COFAC–FeMnMCM–ALG. The resultant COFAC–FeMnMCM–ALG composite beads were then carefully characterized, showing a high immobilization of MnO2/MCM-41@Fe3O4, with porous COFAC as an effective bioadsorbent for enriching the pollutants in the treated samples. These bead catalysts were subsequently applied to the oxidative degradation of TC in a Fenton oxidation system. Several parameters affecting the degradation were investigated, including the H2O2concentration, catalyst dosage, initial TC concentration, and temperature. A very high catalytic activity towards the degradation of TC was demonstrated. The electron paramagnetic resonance (EPR) and quenching results showed that ·OH and ·O2−were generated in the system, with ·OH as the main radical species. In addition, the COFAC–FeMnMCM–ALG catalyst exhibited excellent recyclability/reusability. We conclude that the as-prepared COFAC–FeMnMCM–ALG composite beads, which integrate MnO2and Fe3O4with bioadsorbents, provide a new idea for the design of catalysts for advanced oxidation processes (AOPs) and have great potential in the Fenton oxidation system to degrade toxic pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Xin Zhou,Qianwei Liang,Boqian Yang,Yuyu Chen,Yuanyuan Fang,Hanjin Luo,Yushan Liu
Compounding a single component with a specific function into a composite material that can fully exert synergy effects according to demand is the key to achieving the expected function and expanding emerging applications. Herein, anchoring δ -MnO 2 with strong oxidizing ability on the surface of Fe/Mg-MIL-88B with superior uptake ability for As(V) to form an amorphous nanocomposite with multiple functions for removing more toxic As(III). Due to special construction and rational design, the fabricated nanocomposite demonstrated an excellent As(III) removal performance over a very broad pH range of 3 to 10. Impressively, the adsorption efficiency of the obtained δ -MnO 2 @Fe/Mg-MIL-88B on As(III) is greatly improved, and the maximum adsorption capacity under laboratory conditions is as high as 221.04 mg/g in room temperature. Notably, the residual concentration of arsenic will drop below 10 μg/L, as long as the initial As(III) concentration is not higher than10 mg/L, which is very critical for further promotion. In general, the δ -MnO 2 @Fe/Mg-MIL-88B exhibits excellent promise in removing As(III) from sewage, and its applicability in practical complex water treatment deserves further study.
研究领域:
环境科学
·
材料科学
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Yimei Zhang,Zhuang Chen,Lincheng Zhou,Panpan Wu,Yalong Zhao,Yuxian Lai,Fei Wang,Shuai Li
In this study, MnO 2 /MWCNT hybrids, prepared using a solvothermal method, were coated onto Ni foam and then used as a cathode for tetrabromobisphenol A (TBBPA) degradation. The reaction was confirmed to exhibit the pseudo first-order kinetics. Compared with the original Ni foam cathode, the fabricated electrode exhibited higher catalytic activity, attributed to its strong cross-linking and ability to produce catalytic free radicals. Radical scavenger experiments revealed that O 2 − and OH were involved in the decomposition of TBBPA. The effects of current density, pH, catalyst dosage, and initial TBBPA concentration on removal efficiency were further studied. An optimal removal rate of 98.3% was achieved while the rate constant reached values up to 0.07293 min −1 and the debromination rate was more than 75.4% within 60 min. The electrode showed high catalytic performance and low catalyst loss after 10 cycles, indicating its excellent stability and reusability. The probable mechanism and pathway of TBBPA degradation were suggested based on the analysis of intermediate products. It could be inferred that the decomposition of TBBPA involved C C bond breaks (oxidation) and debromination (reduction). The MnO 2 /MWCNT-Ni foam could be a promising cathode material for electrochemical degradation of halogenated organic compounds.
研究领域:
环境科学
·
电化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Jiacheng Xu,Tiantian Zhang,Shiyu Fang,Zuliang Wu,Erhao Gao,Jiali Zhu,Shuiliang Yao,Jing Li,Lianxin Dai,Weihua Liu,Buhe Zhang,Junwei Zhang
The position of the catalyst in a plasma reactor has an important effect on performance of plasma driven catalytic reaction. An operando diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and mass spectrometry (MS) has been used to investigate CO oxidation on MnO 2 catalyst in in-plasma catalysis (IPC) and post-plasma catalysis (PPC) configurations. It was found that the catalyst in IPC configuration has higher CO conversion and CO 2 selectivity than that in PPC configuration. Operando DRIFTS-MS analysis showed that the IPC configuration generated more reactive oxygen species (M O) on the catalyst surface than the PPC configuration, where M O, M 2+ -O 2 2– , and M + O 2 – are important reactive species promoting CO oxidation to monodentate carbonate that is easy to gasify to gaseous CO 2 . The physical adsorbed O 3 on the catalyst in PPC configuration converts to M 2+ -O 2 2– which combines with CO to form bidentate carbonates that is difficult to gasify to gaseous CO 2 . The mechanisms of CO oxidation on the catalyst in IPC and PPC configurations are discussed.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Weitao Shi,Yuanxin Tan,Jiakun Yang,Haizhen Liu,Yi Fan,Jin Guo,Zhiqiang Lan
In this study, we developed a novel FL-V 2 C-MnO 2 composite catalyst via hydrothermal synthesis, achieving the uniform dispersion of nano-scale MnO 2 particles on few-layer V 2 C MXene substrates. Subsequently, the catalytic effects of this composite on the hydrogen storage performance of MgH 2 were systematically investigated. Remarkably, the MgH 2 system modified with 10 wt% FL-V 2 C-MnO 2 demonstrated superior hydrogen storage characteristics. (1) The initial dehydrogenation temperature decreased substantially to 185 °C (39 % reduction compared to pristine MgH 2 ) with room-temperature hydrogen reabsorption capabilities. (2) At 275 °C, the composite achieved 6.3 wt% hydrogen desorption within 780 s, representing 139 %, 130 %, and 185 % improvements over V 2 C-, FL-V 2 C-, and MnO 2 -doped MgH 2 systems, respectively. Notably, this kinetics enhancement corresponded to a 12.6-fold increase compared to undoped MgH 2 at 325 °C. Mechanistic studies revealed that the synergistic interplay between V 2 C and MnO 2 derivatives established multiphase interfaces that significantly accelerated hydrogen sorption kinetics. Specifically, the in-situ formation of MnO during mechanical activation created abundant active sites, while the two-dimensional V 2 C substrate facilitated electron transfer and prevented nanoparticle agglomeration. This multiscale coordination effect between the MXene support and transition metal oxides established new pathways for destabilizing Mg-H bonds and promoting hydrogen dissociation/recombination processes.
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 20
·4119-4126
·
IF 1.915
Lin Lin,Dongmin Shi,Quanfa Li,Guangfeng Wang,Xiaojun Zhang
Determination of nucleotide kinase activity is valuable due to its importance in regulating nucleic acid metabolism. In this work, a novel and simple colorimetric method for discriminative detection of T4 polynucleotide kinase (PNK) through a MnO2 nanosheet-3,3′,5,5′-tetramethylbenzidine (TMB) colorimetric system is developed. In aqueous solution at pH 7.4, the MnO2 nanosheet, a mimic enzyme, rapidly converts colourless TMB to a blue oxidized form. In the presence of T4PNK, a hairpin DNA could be phosphorylated and further cleaved by λ exonuclease (λ exo) and the ssDNA fragments would adsorb on the surface of the MnO2 nanosheet, resulting in the inhibition of the catalytic effect of the MnO2 nanosheet to the oxidation of TMB and weakening of the blue color of oxidized TMB with the absorption peak centred at 652 nm. The presence of T4PNK can in this way easily be detected with the naked eye, based on the obvious colour change. The experimental results revealed that the advanced strategy was sensitive for detecting T4PNK in the concentration range from 0.005 to 10 U mL−1 with a detection limit of 0.005 U mL−1. In addition, the relative standard deviation was 3.92% in 3 repetitive assays of 10 U mL−1 T4PNK, indicating that the reproducibility of this strategy was acceptable. By comparison with other relevant fluorogenic assays, the sensitivity of the developed chromogenic assays was satisfactory. The present approach opens the possibility for the design of simple and sensitive colorimetric assays for polynucleotide kinase using inexpensive and available TMB as a universal chromogenic compound. Therefore, besides desirable sensitivity and selectivity, due to the colorimetric system, the developed method for T4PNK detection also showed cost-effective, reliable and simplified operations and strategy, which has considerable potential for biological process research.
研究领域:
生物化学
·
分子生物学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Mengxiao Zhong,Maoqiang Chi,Fuqiu Ma,Yun Zhu,Ce Wang,Xiaofeng Lu
In recent years, a significant challenge in material science has been to fabricate novel functional nanomaterials to mimic the function of natural enzymatic systems. Herein, ternary polyaniline (PANi)–MnO2–Pd nanowires (NWs) are synthesized through a two-step redox reaction process. The prepared PANi–MnO2–Pd NWs were explored to exhibit dual responsive enzyme-like efficiencies, e.g., peroxidase and oxidase-like activities. With the assistance of H2O2, the obtained ternary PANi–MnO2–Pd NWs were able to oxidize the typical peroxidase substrate of 3,3′,5,5′-tetramethylbenzidine (TMB) to yield the oxidized TMB with a blue color, exhibiting a much better peroxidase-like activity than the synthesized PANi–MnO2 NWs alone and Pd nanoparticles owing to the interfacial electron transfer effect among the components. In addition, in the absence of H2O2, the prepared PANi–MnO2–Pd NWs could also oxidize TMB to display an excellent oxidase-like activity. Based on the dual responsive enzyme-like characteristic of the obtained ternary PANi–MnO2–Pd NWs, a rapid and applicative colorimetric way to sensitively determine l-cysteine and ascorbic acid (AA) has been developed. The limits of detection based on the two systems were estimated to be as low as 118 and 34 nM, respectively. We believe that the prepared ternary PANi–MnO2–Pd NWs with both peroxidase and oxidase-like activities will show broad potential applications in bioscience and bioengineering.
研究领域:
材料科学
·
生物传感器
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 3
·1094-1104
·
IF 3.925
Hui Luo,Yang Han,Kaiyuan Hu,Jia Li,Dickon H. L. Ng,Xiaodi Ma,Kairui Luan,Mingkang Yang
Herein, we demonstrate a novel Fe3O4@MnO2@HKUST-1 magnetic micromotor with excellent peroxidase-like activity for highly efficient colorimetric detection and degradation of hydroquinone. Such micromotors had unique flower-like morphology with highly exposed active sites. The resulting MnO2-based micromotor was propelled by O2 bubbles generated from hydrogen peroxide fuel catalyzed by MnO2, and the velocity could be adjusted by the H2O2 fuel concentration. The self-propelled motion of the Fe3O4@MnO2@HKUST-1 could effectively increase the collision probability between active sites and pollutant molecules, and thus, enhanced the sensitivity of the colorimetric detection as well as the degradation efficiency. These excellent results confirm that this Fe3O4@MnO2@HKUST-1 micromotor has good prospects for future use in water treatment applications.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 17
·51125-51142
·
IF 5.8
Lu Mang,Wu Xue-jiao,Wan Chu-xing,Gong Qiu-ping,Li Jia-xin,Liao Shuang-shuang,Wang Yu-an,Yuan Shu-hao
A reduced graphene oxide (RGO) supported Fe 3 O 4 -MnO 2 nanocomposite (Fe 3 O 4 -MnO 2 @RGO) was successfully prepared for catalytic degradation of oxytetracycline (20 mg/L) by potassium persulfate (PS) and adsorption removal of mixture of Pb 2+ , Cu 2+ , and Cd 2+ ions (each 0.2 mM) in the synchronous scenario. The removal efficiencies of oxytetracycline, Pb 2+ , Cu 2+ , and Cd 2+ ions were observed as high as 100%, 99.9%, 99.8%, and 99.8%, respectively, under the conditions of [PS] 0 = 4 mM, pH 0 = 7.0, Fe 3 O 4 -MnO 2 @RGO dosage = 0.8 g/L, reaction time = 90 min. The ternary composite exhibited higher oxytetracycline degradation/mineralization efficiency, greater metal adsorption capacity (Cd 2+ 104.1 mg/g, Pb 2+ 206.8 mg/g, Cu 2+ 70.2 mg/g), and better PS utilization (62.6%) than its unary and binary counterparts including RGO, Fe 3 O 4 , Fe 3 O 4 @RGO, and Fe 3 O 4 -MnO 2 . More importantly, the ternary composite had good magnetic recoverability and excellent reusability. Notably, Fe, Mn, and RGO could play a synergistic role in the improvement of pollutant removal. Quenching results indicate that surface bounded SO 4 •– was the major contributor to oxytetracycline decomposition, and the -OH groups on the composite surface shouldered a significant role in PS activation. The results indicate that the magnetic Fe 3 O 4 -MnO 2 @RGO nanocomposite has a good potential for removing organic-metal co-contaminants in waterbody. Graphical Abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2019
·
IF 9.518
Xiao-Long Fu,Fang Hou,Fu-Rao Liu,Shu-Wei Ren,Jun-Tao Cao,Yan-Ming Liu
The energy transfer efficiency, strongly depending on the distance of donor–acceptor pair, is always a crucial factor for the construction of elegant electrochemiluminescence resonance energy transfer (ECL-RET)-based biosensors. In this paper, a novel and efficient ECL-RET in 2D/2D heterostructured g-C 3 N 4 /MnO 2 was developed using g-C 3 N 4 nanosheets (g-C 3 N 4 NSs) as energy donor and MnO 2 nanosheets (MnO 2 NSs) as energy acceptor. In this system, MnO 2 NSs in-situ grew on g-C 3 N 4 NSs to form the 2D/2D heterostructure , greatly shortening the distance of the donor–acceptor pair (g-C 3 N 4 –MnO 2 ) and thus greatly enhancing the RET efficiency. To demonstrate the performance of the system, a signal “off-on” ECL sensor was designed for glutathione (GSH) analysis. In the absence of GSH, MnO 2 significantly quenched the ECL intensity of g-C 3 N 4 owing to ECL-RET in this 2D/2D g-C 3 N 4 /MnO 2 heterostructure (ECL signal “off”). Upon the addition of GSH, MnO 2 was reduced to Mn 2+ by GSH and g-C 3 N 4 was released from the heterostructured g-C 3 N 4 /MnO 2 , generating a recovery of ECL intensity (ECL signal “on”). Under the optimal conditions, the designed ECL-RET signal “off-on” sensor realized the sensitive detection of GSH ranged from 0.2–100 μM with the detection limit of 0.05 μM. Furthermore, the as-prepared ECL-RET sensor exhibits good performance in the determination of GSH in human serum samples. The ECL-RET in 2D/2D heterostructure provides an ingenious way for the exploitation of novel ECL biosensing systems.
研究领域:
分析化学
·
生物传感
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）