Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Binliang Wang,Junli Zheng,Yingying Li,Adel Zaidi,Yiwei Hu,Baowei Hu
Exploitation of algal biochar is a profitable opportunity for the utilization of filamentous green algae due to its sustainable growth and ease of harvest. In this study, Rhizoclonium -derived biochar (CB) and δ-MnO 2 -modified biochar (MnO 2 /CB) were fabricated for uranium (U(VI)) removal. The results showed that the δ-MnO 2 modification increased the BET surface area and decreased the isoelectric point. The maximum sorption amount of U(VI) by the MnO 2 /CB reached up to 100.2 mg/g (pH = 6.0, 289 K, and 0.01 M NaCl), which was two times higher than that of the CB. After five consecutive sorption/desorption cycles, the affinity of the MnO 2 /CB for U(VI) maintained in 94.8%. According to the analysis of X-ray photoelectron spectroscopy, it confirmed that the U(VI) sorption was mainly ascribed to the surface complexation between U(VI) and oxygen-containing functional groups on the surface of the MnO 2 /CB. Therefore, this investigation not only encourages the development of algal biochar derived from the filamentous green algae but also provides a novel adsorbent for U(VI) removal from aqueous solutions.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Hongzhi Chen,Ke Tian,Taiping Qing,Xiaoqing Liu,Jiangling Mao,Jingxi Qin,Shunfeng Jiang
The development of efficient and environmentally friendly catalysts for activating persulfate is the focus of advanced oxidation treatment of organic contaminants. Manganese dioxide (MnO 2 ), which has a multivalent nature and is a low-toxic natural stock, has the ability to immediately oxidize pollutants. In order to further improve its catalytic performance, the α-MnO 2 nanofiber coated with graphene oxide (α-MnO 2 @GO) was prepared by one-step hydrothermal method, and worked as a peroxmonsulfate (PMS) activator for efficient degradation of tetrabromobisphenol A (TBBPA). The structure characterization results indicate that α-MnO 2 nanofibers are successfully encapsulated by graphene and assembled into a three-dimensional layered structure. The factors affecting the catalytic degradation of TBBPA by this catalyst are investigated in detail. Under optimal conditions, the highest removal ratio of TBBPA could reach 100% after treatment of 20 min by α-MnO 2 @GO/PMS system, and a good mineralization efficiency of up to 79.50% is obtained. Electron paramagnetic resonance detection combined with quenching experiments showed that sulfate radical and hydroxyl radical played a role in the degradation of TBBPA. Based on X-ray photoelectron spectroscopy and free radical scavenging experiments, the peroxmonsulfate activation mechanism by α-MnO 2 @GO was proposed. Finally, based on the discovered intermediates, two potential TBBPA degradation routes using this catalyst were suggested. This study not only provides a new strategy for improving the catalytic activity of MnO 2 but also sheds new insight into the application of eco-friendly natural stock for environmental remediation.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yahang Li,Hanrui Zhou,Qing Song,Mingzhu Zou,Ying Wei,Qingguo Zhang
The emergence of flexible, painless sensors for biomolecule measurement represents a growing trend in biomedical research. In this context, a highly sensitive flexible sweat sensor, incorporating MnO 2 -TMB@PAM aggregates employing dual-detection routes via visualization and UV–vis spectrometry, has been developed. The sensor utilizes bovine serum albumin (BSA) templated MnO 2 nanoparticles (NPs) as a catalyst for glucose detection. Unlike natural enzymes, this nanozyme is not only cost-effective and stable but also exhibits tandem enzyme-like activities, which facilitates quick and straightforward glucose detection. MnO 2 NPs are synthesized in situ on the surface of polyacrylamide (PAM), ensuring high stability and increasing the contact area of reactors, thereby enhancing the catalytic efficiency of MnO 2 NPs . Additionally, 3,3′,5,5′-tetramethylbenzidine (TMB) is modified on the hydrogel to create an integrated sensing patch (referred to as MnO 2 -TMB@PAM). This patch enables fast and convenient sensing routes, positioning it as a potential candidate for point-of-care testing (POCT) devices. Due to the excellent flexibility and transmittance of PAM , the sensing patch allows for rapid colorimetric analysis of biomolecules such as glucose and dopamine via UV–vis spectrophotometry, as well as visual detection with the naked eyes. Consequently, a high-sensitive, selective, and visually active flexible sensor has been established based on colorimetric and visual methods, facilitating efficient sensing of biomarkers from in vitro biological fluids.
研究领域:
生物医学工程
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材料科学
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分析化学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
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IF 4.175
Lidong Sun,Nian Li,Shudong Zhang,Xinling Yu,Cui Liu,Yongqiang Zhou,Shuai Han,Wenbo Wang,Zhenyang Wang
Porous carbon composite electrodes have attracted extensive attention due to their excellent electrochemical performance toward energy storage applications. In this work, hierarchical nitrogen-containing porous carbon (HNPC) and α-MnO 2 nanowires composite electrode is prepared through a template method. The as-prepared composite electrode, characterized as one-dimensional nanowires inserted into three-dimensional interconnected porous structures, exhibits high specific capacitance of 204.6 F g −1 at 1 A g −1 and excellent cycling stability (97.2% remains after 5000 cycles). Moreover, the fabricated asymmetric supercapacitor based on HNPC//HNPC/MnO 2 achieves a wide working voltage window of 1.8 V and a high energy density up to 30.1 Wh kg −1 at a power density of 900.0 W kg −1 . The results indicate that the HNPC/MnO 2 composite electrodes with excellent electrochemical performance have promising perspective in supercapacitor applications.
研究领域:
材料科学
·
能源存储与转换
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Jun Wang,Simeng Bi,Li Wei,Yi Shen,Fanpeng Meng,Yang Zhang,Xiaoyao Tan
To probe the underlying mechanisms of carbocatalysis in enhanced permanganate (PM) oxidation and identify the exact roles of nascent MnO 2 , graphene aerogels (GA) were fabricated to activate PM for naproxen (NPX) degradation. All the three GA samples could accelerate NPX oxidation by PM, the rate constants and reaction stoichiometric efficiency (RSE) followed the order of GA900 > GA600 > GA300. Mechanistic studies revealed that Mn(VI), Mn(V) and Mn(III) were not the major reactive species involved in NPX oxidation, but highlighted the essential contribution of electron transfer pathway (ETP) mediated directly by GA and indirectly by nascent MnO 2 . For GA300 with strong electron-donating capability, it mainly served as the electron donor for PM decomposition, and indirectly oxidized NPX via nascent MnO 2 mediated ETP, thereby exhibiting inferior RSE as well as mediocre recycling performance. GA600 and GA900 could serve as the electron shuttle to directly mediate the ETP for NPX degradation, the nascent MnO 2 accumulated on GA framework during the reaction would also mediate the ETP from NPX to PM, thus displaying an obvious accelerating recycling performance. This work provides novel insights into the structure-dominated PM carbocatalysis, which contributes better to development of promising carbocatalysts and utilization of nascent MnO 2 .
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2023
·Vol. 58
·期 8
·3551-3567
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IF 4.5
Yang Xia,Wei Songrui,Ma Xilong,Gao Zhuwei,Huang Wei,Wang Dun,Liu Zhongxin,Wang Jieqiong
The photothermal process exhibits the largest energy conversion efficiency among all solar energy utilization processes. In this study, a core–shell CoTiO 3 @MnO 2 (CTM) composite photothermal catalyst was synthesized by supporting MnO 2 on CoTiO 3 by hydrothermal synthesis. Binding to peroxymonosulfate (PMS) heterogeneous catalyst removed tetracycline in wastewater. The new catalyst was characterized by FT-IR, UV–Vis, XRD, BET, SEM, TEM, and so on. Kinetic analysis showed that CTM activated PMS at a rate of 3.2 and 3.5 times higher than that of pure light and heat conditions, with complete degradation of tetracycline (TC). Since the outer MnO 2 layer converted the absorbed solar energy into thermal energy, PMS was activated to generate active species while performing electron transfer, which resulted in a considerably improved catalytic efficiency. To prove the wide applicability of the catalyst, other pollutants were degraded, including bisphenol A (BPA), metronidazole (MNZ), and methyl orange (MO). The three pollutants were degraded within 40 min. Finally, our findings demonstrated the mechanism of the photothermal degradation process and provided a novel approach for environmental remediation using renewable solar energy.
Graphical Abstract In this paper, the degradation efficiency of CoTiO 3 was improved by loading MnO 2 on CoTiO 3 . Binding to peroxymonosulfate (PMS) heterogeneous catalyst activation for the catalytic degradation of tetracycline. It was found by experiments that the core-shell structure of the composite material CoTiO 3 @MnO 2 had better photothermal catalysis efficiency than photocatalysis and thermal catalysis.
研究领域:
环境科学
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材料科学
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化学工程
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可再生能源
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产品关联
DOI
高影响因子
ACS Applied Bio Materials
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2018
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IF 0
Qingqing Tan,Ruirui Zhang,Weisu Kong,Fengli Qu,Limin Lu
A novel “turn-on” fluorescent trypsin detection platform dependant on carbon dot-MnO2 (CD-MnO2) nanocomposites and ascorbic acid-loaded apoferritin (APOAA) was fabricated. The detection mechanism relied on trypsin-catalyzed enzymolysis of APOAA, which released ascorbic acid (AA) as a reducing agent to disintegrate the MnO2 nanosheets, causing the recovery of the fluorescence of CDs. An excellent performance and high sensitivity of trypsin determination were observed with a detection limit (LOD) of 0.3411 ng/mL. This work provides us with a unique strategy for trypsin detection in human serum samples, which reveals the potential applications in clinical detection.
研究领域:
生物化学
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医学诊断
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纳米材料科学
✓ 已验证
产品关联
DOI
PubMed
ACS Applied Materials & Interfaces
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2016
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IF 7.145
Wen She,Han Bi,Zhiwei Wen,Qinghe Liu,Xuebing Zhao,Jie Zhang,Renchao Che
A tunable response frequency is highly desirable for practical applications of microwave absorption materials but remains a great challenge. Here, hollow lightweight polydopamine@α-MnO2 microspindles were facilely synthesized with the tunable absorption frequency governed by the aspect ratio. The size of the hard template is a key factor to achieve the unique shape; the polymer layer with uniform thickness plays an important role in obtaining spindles with homogeneous size. With the aspect ratio increasing, the maximum reflection loss, as well as the absorption bandwidth (<−10 dB), increases and then decreases; meanwhile, the microwave absorption band shifts to the low frequency. The optimized aspect ratio of the cavity about the hollow polydopamine@α-MnO2 microspindles is ∼2.8. With 3 mm thickness at 9.7 GHz, the strongest reflection reaches −21.8 dB, and the width of the absorbing band (<−10 dB) is as wide as 3.3 GHz. Via electron holography, it is confirmed that strong charge accumulates around the interface between the polydopamine and α-MnO2 layers, which mainly contributes to the dielectric polarization absorption. This study proposes a reliable strategy to tune the absorption frequency via different aspect ratio polymer@α-MnO2 microspindles.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Wenlan Ji,Xinyu Miao,Tian C. Zhang,Yuan Wang,Shaojun Yuan
The elimination of arsenic pollution has attracted increasing concerns due to its toxicity and severe carcinogenicity. Herein, we proposed an in-situ crystal growth strategy without surfactant to fabricate MIL-88B uniformly anchored on the surface of MnO 2 /GAC (MIL-88B/MnO 2 /GAC). Such innovative MIL-88B/MnO 2 /GAC nanostructured composites not only exhibited the synergetic functions of simultaneously oxidizing As(III) and adsorbing the generated As(V), but also effectively reduced the cost of metal–organic frameworks (MOFs) adsorbents. Impressively, the as-prepared sample achieved remarkably boosted As(III) removal capacity of 15.13 mg g −1 compared to 4.1 mg g −1 of MnO 2 /GAC composite and 2.1 mg g −1 of GAC , which was mainly ascribed to the synergistic effect between the excellent adsorption abilitiy of MIL-88B and oxidation property of MnO 2 /GAC. Owing to the unique construction and properties, the constructed MIL-88B/MnO 2 /GAC composites presented a desirable As(III) removal ability under a wide pH scope of 2 to 10. Moreover, the possible mechanism of the synergistic removal over MIL-88B/MnO 2 /GAC was elucidated by X-ray photoelectron spectroscopy (XPS), electron spin resonance (ESR) and radical trapping experiment. This work not only offers a superior bifunctional catalyst for high-efficient removal of arsenic, but also provides a new perspective for rational construction of MOF derivatives for their further applications.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Yingguang Zhang,Muyan Wu,Y.H. Kwok,Yifei Wang,Wei Zhao,Xiaolong Zhao,Haibao Huang,Dennis Y.C. Leung
A series of TiO 2 /MnO 2 heterojunction catalysts were fabricated through an in-situ hydrothermal method, and for the first time, catalysts with this heterojunction structure were used for VUV-PCO toluene degradation. After the MnO 2 coating, the TiO 2 /MnO 2 catalysts performed excellently for both VOCs degradation and residual ozone decomposition with removal efficiency reaching 96.0% and 99.9%, respectively. The enhanced photocatalytic activity towards toluene degradation could be attributed to the heterojunction structure of TiO 2 /MnO 2 , which provides excellent contact between MnO 2 and TiO 2 , and suppresses the recombination of photogenerated electron-hole pairs. Moreover, benefiting from the MnO 2 , the ozone generated in the system could be efficiently utilized and eliminated during the VUV-PCO process. The photocatalytic mechanism of TiO 2 /MnO 2 for the toluene degradation and ozone decomposition was proposed.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2015
·
IF 3.893
Faheem Nawaz,Yongbing Xie,Hongbin Cao,Jiadong Xiao,YueqiuWang,Xihua Zhang,Mingjie Li,Feng Duan
Two series of α-MnO 2 materials were prepared via a similar method with surfactant cetyltrimethylammonium bromide (CTAB) and sodium dodecyl benzene sulfate (SDBS). The surfactants work both as shape directing agent and reduction initiator. The α-MnO 2 synthesized with 0.2 M of CTAB showed a mesoporous structure with high surface area of 387.7 m 2 /g. It is very active in catalytic ozonation of 4-nitrophenol (4-NP) and total organic carbon removal, with higher catalytic stability than commercial MnO 2 . Using tert -butanol and p -benzoquinone as scavengers of different oxidative species, we found that superoxide radicals, rather than hydroxyl radicals, were mainly responsible for the degradation of 4-NP.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
BIOMEDICINE & PHARMACOTHERAPY
·
2024
·
IF 6.9
Lihua Shao,Dun Liu,Xuexue Liu,Xueyuan Wang,Xian Yang,Runyan Niu,Shaoping Yin,Peipei Xu,Yonghuan Mao,Xiao Du,Lin Yang
In recent years, the integration of radiotherapy and nanocatalytic medicine has gained widespread attention in the treatment of breast cancer. Herein, the glucose oxidase (GOx) and MnO 2 nanoparticles co-modified multifunctional liposome of GOx-MnO 2 @Lip was constructed for enhanced radiotherapy. Introduction of GOx would not only elevate the glucose consumption to starve the cancer cells, but also increased the endogenous H 2 O 2 level. Meanwhile, high intracellular GSH concentration facilitated the release of Mn 2+ to amplify the cytotoxic ·OH through cascade catalytic reactions within the tumor microenvironment, resulting in a favorable tumor suppression rate of 74.45 %. Furthermore, the blood biochemical and blood routine demonstrated that GOx-MnO 2 @Lip had no obvious toxic side effects. Therefore, this work provided a potential vehicle for synergistic cancer starving therapy, chemodynamic therapy and radiotherapy for improving therapeutic efficacy of breast cancer.
研究领域:
肿瘤学
·
纳米医学
·
生物化学
✓ 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）