CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Zhu-yu Li,Le-ran Li,Sheng Li,Ding-can Wang,Qi Niu,Kai Li,Ji Liu,Qiang Lu
Calcium-based thermochemical heat storage (TCHS) is an economical and environmentally friendly technology for efficient heat storage. It can strengthen the flexibility in power systems of renewable energy and promote the recovery and storage of waste heat in energy-intensive industries. However, CaO/CaCO 3 is extremely prone to sintering at operational temperatures. Consequently, a cost-effective approach was proposed to synthesize calcium-based TCHS materials modified by pyroligneous acid (PA) impregnation and co-doping with dual transition metals. The heat storage performance, physicochemical property, and anti-sintering mechanism of synthesized CaO were comparatively examined. The sample prepared with a molar ratio of Ca: Co: Mn = 100:3:7 (PACa-Co3Mn7) exhibited an initial energy storage density of 1.76 MJ/kg, which gradually rose to 1.88 MJ/kg. After 20 cycles, the value decreased by only 4.39 % from its peak, indicating outstanding TCHS performance. Characterization results indicated that the specific surface area and pore volume of PACa-Co3Mn7 were 10.48 m 2 /g and 0.035 cm 3 /g, which were 2.34 and 2.69 times those of CaO stemmed from the calcination of limestone, respectively. The fruitful pores provided pathways for CO 2 diffusion within the CaO particles or CaCO 3 product layer. The uniformly distributed Co and Mn elements combined to form Ca 3 CoMnO 6 . Ca 3 CoMnO 6 could serve as the inert carrier that mitigated the grain-growth of CaO, thereby stabilizing the pore structure and resisting the sintering of PACa-Co3Mn7. Furthermore, density functional theory (DFT) calculations demonstrated that the free Mn and Co elements efficiently promoted the electrons transfer between CaO and CO 2 , which improved the reactivity of PACa-Co3Mn7. Therefore, CaO modified by PA impregnation and co-doping with dual transition metal is a promising candidate for the TCHS system.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Kun Wu,Meng Wang,Angzhen Li,Zixuan Zhao,Ting Liu,Xiaodan Hao,Shengjiong Yang,Pengkang Jin
Mn-oxide-containing adsorbents have shown outstanding performances for the removal of As(III) through an “oxidation-adsorption” process. In this study, a new adsorbent of Fe-Mn-Cu ternary oxide (FMCTO) was fabricated to improve the redox reaction rate and to enhance the recovery of oxidative ability. FMCTO exhibited a stronger ability for As(III) removal than most of other adsorbents, because it has better oxidative capability for As(III) oxidation. The state of dynamic equilibrium for As(III) removal by FMCTO could be basically achieved within 3 h, and the As removal efficiency reached 98.9% at time = 24 h. The Langmuir As adsorption capacity of FMCTO was determined to be 204.8 mg/g. The As(III) removal efficiency of FMCTO was further boosted by 7% through oxygen gas aeration and decreased by 19% with nitrogen gas in the ambient during the first 3 h, indicating the positive effect of oxygen on As(III) oxidation. EPR and UV spectra methods were used to confirm the generation of superoxide radical (O 2 − ) and the enhanced production of Mn(III) soluble species on FMCTO surfaces, thus achieving a better As(III) oxidation performance. The XPS analysis results showed that the electron transfer from Cu(I) to Mn(IV) could improve the stability of Mn(III) within FMCTO. Meanwhile, Mn(II) ions could be oxidized to Mn(III) by O 2 − . Hence, the formation of a redox cycle between Mn(II) and Mn(III) along with the production of O 2 − plays a vital role in the upgraded As(III) removal mechanisms. This study provides new insights into the promotion of the capability of Mn-containing adsorbents for achieving the improved removal of As from As(III)-contaminated water.
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
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2018
·Vol. 18
·期 4
·2993-2999
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IF 1.354
Liu Chun-Ling,Hou Chang-Jun,Huo Dan-Qun
In this work, a simple room-temperature phosphorescence (RTP) method was first proposed to detect adriamycin, by using a functional material of Mn doped ZnS quantum dots (Mn–ZnS QDs) composited with poly(diallyldimethylammonium chloride) (PDDA). After PDDA was associated to the
Mn–ZnS QDs, the RTP intensity was significantly enhanced. As a result, Mn–ZnS QDs/PDDA nanoassemblies greatly improve the adriamycin detection ability of QDs and provide an important method for developing more effective and sensitive adriamycin detection sensor. The method based
upon RTP has a linear range from 0.5 to 64.0 μM with a detection limit (3σ/s) for adriamycin of 0.45 μM. The developed method was further successfully applied to detect adriamycin in human serum samples (diluted 50 times) with satisfactory results, and
the recovery ranged from 98.3 to 101.3.
研究领域:
分析化学
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生物医学工程
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药物分析
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ertai Zhang,Shuyan Guan,Haojun Fan,Yongxin Wang,Hui Yan,Lei Guo,Xuedong Zhai,Carlos A. Martínez Huitle,Jing Ding
Sulfite has been proven to promote advanced oxidation processes (AOPs) to achieve low-cost and efficient degradation of contaminants, serving as an alternative to persulfate. In this study, a novel composite Fe/Mn@carbon felt (CF) electrode was successfully constructed to remove carbamazepine (CBZ). The capacity of the Fe/Mn@CF anode to activate sulfite was evaluated under various electrode preparation conditions and operating parameters. Results clearly indicated that the complete removal of CBZ was achieved in Fe/Mn@CF anode activated sulfite system under the specific conditions including Na 2 SO 4 electrolyte concentration of 50 mM, sulfite dosage of 1 mM, initial pH of 7, and current density of 1 mA/cm 2 . The capacity of Fe/Mn@CF anode for sulfite activation was further presented by its excellent reusability and stability in terms of CBZ removal and metal ion release. Both radical and non-radical pathways were significantly contributed to the CBZ removal, including OH, SO 4 · - , O 2 · - , 1 O 2 , and other reasons. Density functional theory (DFT) calculations demonstrated that Fe-Mn bimetals effectively promoted sulfite activation, with the electric field further boosting the process of Fe-Mn valence cycle and oxidation. Overall, the novel Fe/Mn@CF activated sulfite system exhibited outstanding performance and had great potential for sustainable use in removing organics.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2016
·
IF 5.31
Xiaoxiang Cheng,Heng Liang,Fangshu Qu,An Ding,Haiqing Chang,Bin Liu,Xiaobin Tang,Daoji Wu,Guibai Li
Mn oxide incorporated membranes were fabricated by incorporation of MnO 2 particles prepared using different methods (C-MnO 2 , M-MnO 2 and S-MnO 2 ) on the surface of ceramic ultrafiltration membranes. Initially, the physicochemical properties of prepared MnO 2 particles were systematically analyzed, and S-MnO 2 exhibited the best dispersibility and smallest particle size. Scanning electron microscopy and atomic force microscopy analyses demonstrated that the morphologies and topographies of the fabricated membranes were significantly affected by the preparation method of MnO 2 particles. Subsequently, sodium alginate was employed to investigate the antifouling properties of the fabricated membranes. Although the incorporation of MnO 2 particles increased membrane intrinsic resistance to varying degrees, M-MnO 2 and S-MnO 2 apparently mitigated both reversible and irreversible fouling in the presence of ozone, whereas C-MnO 2 exerted a minor influence. Further, p -chloronitrobenzene was used to study the activity of fabricated membranes in catalytic ozonation. C-MnO 2 , M-MnO 2 and S-MnO 2 incorporated membranes exhibited enhanced activities with the removal efficiencies of 51.7%, 61.5% and 68.0%, respectively. The results indicated that the preparation method of S-MnO 2 was most appropriate for the preparation of highly dispersive MnO 2 particles to incorporate with ceramic membranes. Results in this study contribute to the fabrication of Mn oxide incorporated membranes with an efficient and convenient way, and provide relevant information on their actual application.
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
JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Liwei Yang,Fashan Yang,Heng Zhang,Hongyu Zhou,Mengfan Luo,Yunmei Liu,Chuanliang Zhao,Lu Zheng,Bo Lai
At present, the potential mechanism of manganese oxide (MnO 2 ) activation of PI and the key active sites of PI activation are still unclear and controversial. To this end, three different crystal forms of MnO 2 were prepared in this study and used to activate PI to degrade pollutants. The results showed that different crystal types of MnO 2 showed different catalytic abilities, and the order was γ-MnO 2 > α-MnO 2 > β-MnO 2 . Through quenching experiments, EPR tests, Raman experiments and in situ electrochemical experiments, it has been confirmed that electron transfer-mediated non-free radical process is the main mechanism of pollutant degradation , in which the active substance is the highly active metastable intermediate complex (MnO 2 /PI*). Hydroxyl radical (HO • ), superoxide radical (O 2 •− ), singlet oxygen ( 1 O 2 ) and iodine radical (IO 3 • ) did not participate in pollutant degradation. The quantitative structure-activity relationship analysis confirmed that the catalytic performance of MnO 2 was highly positively correlated with the surface Mn(IV) content, which indicated that the surface Mn(IV) site was the main active site. Overall, this study will be of great help to the design and application of manganese dioxide activation for periodate degradation of pollutants.
研究领域:
环境科学
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材料化学
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2021
·Vol. 29
·期 1
·1289-1300
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IF 4.223
Huang Tao,Du Jing,Yu Danni,Deng Shihan,Zhang Shuwen,Liu Longfei
Aqueous Fe(II)-catalyzed activation commonly deteriorates the oxidation performance of persulfate (PS) to the treatment of organic contaminants. In this study, a PS-doped layered bimetallic hydroxide (Fe–Mn hydroxide) was synthesized to construct a heterogeneously catalytic system to solve the issue brought by homogeneity. The molar ratio of Fe(II) to Mn(II) and the mass ratio of PS to Fe–Mn hydroxide both had a significant impact on the catalytic degradation of p-CP. Reaction temperatures engaged in the most essential role in influencing the degradation and removal of p-chlorophenol (p-CP). The optimal combination of factors for the preparation of PS-hydroxide and the treatment of p-CP was finally determined by significance analysis. The degradation process was appropriately fitted by the pseudo-first-order kinetic model. The benzene ring in p-CP was broken by PS-hydroxide during the adsorption. The surface modification of PS-hydroxide caused by the valence transition of Mn was beneficial to the adsorption and catalytic degradation of p-CP.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
Analytical Methods
·
2020
·Vol. 12
·期 27
·3513-3522
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IF 2.596
Zhenping Liu,Jingzhou Hou,Qiang He,Xiaogang Luo,Danqun Huo,Changjun Hou
In this work, a new application of Mn-doped ZnS quantum dots (Mn-ZnS QDs) was developed to screen chloramphenicol (CAP) and tetracycline (TC) residues simply and rapidly. Mn-ZnS QDs synthesized by a hydration method and modified by L-cysteine for better stability emit phosphorescence at 583 nm with the excitation wavelength at 289 nm. Based on the overlap of the Mn-ZnS QDs excitation spectra and CAP or TCs ultraviolet spectra, the excited light of the Mn-ZnS QDs was partially absorbed by CAP or TCs owing to the inner-filter effect (IFE), leading to a decrease in the phosphorescence intensity. The phosphorescence intensities of the samples prepared by mixing different TCs and CAP were in good agreement with the expected results from adding a single antibiotic sample. Therefore, the total molar concentrations of CAP and TCs could be screened based on the linear equation of a single standard substance. Represented by tetracycline (TC), as a member of the tetracycline family, under optimized conditions, showed a good linear relational concentration range over 4 orders of magnitude from 50 to 1.5 × 105 nM with a limit of detection (LOD; S/N ratio = 3) down to 8.6 nM. The phosphorescent sensor was also used to detect total TCs in actual samples successfully. The evaluations of the recovery rate and selectivity were good. These results demonstrated that the presented phosphorescent sensor can be a simple and rapid screening platform for CAP and TCs.
研究领域:
分析化学
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食品科学
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环境科学
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
·
IF 19.503
Yaowei Lu,Yongxing Wang,Qinghu Tang,Qiue Cao,Wenhao Fang
The synergistic effect in a bimetallic oxide usually plays a vital role in determining the behavior of supported-metal catalysts. We show the unique synergy in a Sn x Mn 1 O y oxide, which can boost the hydrogenation catalysis of supported Pt nanoparticles for selective conversion of levulinic acid (LA) to γ-valerolactone (GVL). On a series of Pt/Sn x Mn 1 O y catalysts with a similar Pt loading ( ca. 0.44 wt%) and a controlled Pt size ( ca. 2.7 nm), the intrinsic TOF presents a volcano-like dependence on Pt 0 sites and Lewis acidity, which is determined by the variable synergistic effect between MnO y and SnO y . The optimal Pt/Sn 0.8 Mn 1 O y catalyst exhibits a high i TOF of 2709 h −1 and achieves 100% selectivity to GVL at 99% conversion of LA at 120 ℃ and 2 MPa of H 2 . DFT calculations demonstrate that the incorporation of Sn can provide a lower energy barrier for the crucial elementary reactions.
研究领域:
化学工程
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催化科学
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DOI
高影响因子
International Journal of Nanomedicine
·
2023
·
IF 8
Shaohui Zheng,Min Zhang,Hongyan Bai,Meijuan He,Lina Dong,Lulu Cai,Mingming Zhao,Qi Wang,Kai Xu,Jingjing Li
Background Early diagnosis of renal cell carcinoma is extremely significant for the effective treatment of kidney cancer. The development of AS1411 aptamer modified Mn-MoS2 QDs provides a promising fluorescence/magnetic resonance (MR) dual-modal imaging probe for the precise diagnosis of renal clear cell carcinoma.Methods In this work, Mn-MoS2 QDs were synthesized through a simple “bottom-up” one-step hydrothermal method. AS1411 aptamer was modified on the Mn-MoS2 QDs to improve the specificity to renal cell carcinoma. The characteristics of Mn-MoS2 QDs were confirmed by transmission electronic microscopy (TEM), atomic force microscope (AFM), X-ray photoelectron spectrometer (XPS), photoluminescence (PL) emission spectra, etc. Cellular fluorescence labelling was investigated using the Mn-MoS2 QDs and AS1411-Mn-MoS2 QDs. The T1-weighted MR imaging was assessed by the in vitro MR cell imaging and in vivo MR imaging. Finally, the long-term toxicity of Mn-MoS2 QDs was investigated by the hematology and histological analysis.Results The prepared Mn-MoS2 QDs exhibited excellent aqueous property, intense fluorescence, low toxicity, high quantum yield of 41.45% and high T1 relaxivity of 16.95 mM−1s−1. After conjugated with AS1411 aptamer, the AS1411-Mn-MoS2 QDs could specifically fluorescently label the renal carcinoma cells and present a specific MRI signal enhancement in the tumor region of mice bearing renal carcinoma tumors. Furthermore, Mn-MoS2 QDs revealed low toxicity to the mice via hematology and histological analysis.Conclusion These results demonstrated the potential of AS1411-Mn-MoS2 QD as a novel nanoprobe for targeted MR imaging and fluorescence labelling of renal cell carcinoma.
研究领域:
医学影像学
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纳米医学
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肿瘤学
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DOI
PubMed
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Linsong Cheng,Yuanxiang Mao,Lei Jiang,Rui Ma,Jiangsen Ma,Yiyuan Zhuo,Qiushi Shen,Caocong Liu,Liuwei Zhao,Xiaoyi Xu,Fangying Ji
The high concentration of salt in organic wastewater has a strong inhibitory effect on the removal of pollutants. A method for the efficient removal of trace pollutants in high-salinity organic wastewater was developed. This study investigated the effect of the combination of permanganate [Mn(VII)] and calcium sulfite [S(IV)] on pollutant removal in hypersaline wastewater . The Mn(VII)-CaSO 3 system removed more pollutants from high-salinity organic wastewater than from normal-salinity wastewater. Chloride (increasing from 1 M to 5 M) and low concentration of sulfate (increasing from 0.05 M to 0.5 M) significantly enhanced the system's resistance to pollutants under neutral conditions. Despite the fact that Cl − can combine with the free radicals in the system and reduce their efficiency in removing pollutants, the presence of chloride ions greatly enhances the electron transfer rate in the system, promoting the conversion of Mn(VII) to Mn(III) and significantly increasing the reaction rate of Mn(III) as the primary active species. Therefore, chloride salts can greatly enhance the removal of organic pollutants by Mn(VII)-CaSO 3 . Although sulfate does not react with free radicals, a high concentration of sulfate (1 M) will affect the formation of Mn(III), which greatly weakens the removal effect of the entire system on pollutants. The system can still have a good pollutant removal effect with mixed salt. Altogether, this study demonstrates that the Mn(VII)-CaSO 3 system offers new possibilities for the treatment of organic pollutants in hypersaline wastewater.
研究领域:
环境科学
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化学工程
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DOI
PubMed
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2017
·Vol. 33
·期 9
·1865-1874
·
IF 0.767
NING Hong-Yan,YANG Qi-Lei,YANG Xiao,LI Ying-Xia,SONG Zhao-Yu,LU Yi-Ren,ZHANG Li-Hong,LIU Yuan
Rh-Mn-based catalysts are promising for ethanol synthesis from syngas. In this work, a carbon fiber (CF)-supported Rh-Mn catalyst, with highly dispersed Rh and close contact Rh-Mn species, has been prepared by a new in situ polymerization route using citric acid and ethylene
glycol interaction. The structure and physicochemical properties of both the calcined and reduced samples have been characterized by TPR, XRD, TEM, EDS, CO-TPD, H2 chemisorption, and XPS techniques and the catalytic performance for ethanol synthesis from syngas has been evaluated.
The results show that the new method is beneficial in forming close contact Rh-Mn species than that obtained with the conventional impregnation method. This can enhance the dispersion and sintering resistance of Rh and effectively improve the activity of CO hydrogenation and the selectivity
to ethanol in ethanol synthesis from syngas.
研究领域:
化学工程
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材料科学
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催化化学
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DOI
高影响因子
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