JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Mingyang Li,Wanlu Zhang,Xuewei Zhang,Yongfu Lian,Xiaoyu Niu,Yujun Zhu
Catalytic oxidation is considered as the most effective and economical method to remove low concentration volatile organic compounds (VOCs). Activation of oxygen to form active oxygen species on metal oxides catalyst plays a key role in the process. Three copper-manganese oxide catalysts with cubic Cu 1.5 Mn 1.5 O 4 phases were prepared by microwave heating (CM-MW), sol–gel (CM-SG) and co-precipitation (CM-CP) methods, and applied for the elimination of toluene and benzene as representative aromatic VOCs. These catalysts exhibit different catalytic oxidation performance due to their different physicochemical properties. Various characterizations were used to clarify the role of different oxygen species in the oxidation of VOCs, and the reaction pathway. In situ DRIFTS were carried out to explore the function of surface adsorbed oxygen, oxygen vacancy , and surface lattice oxygen in the catalytic oxidation of VOCs over three catalysts. Various types of intermediate species and detailed reaction pathways are also explored by combining in situ DRIFTS and mass spectrometry . Among these catalysts, CM-MW with nanosheet morphology shows the best catalytic oxidation performance of toluene and/or benzene with/without H 2 O due to the most abundant active oxygen species, and the highest oxygen vacancy concentration which is beneficial to activate oxygen. Meanwhile, toluene and benzene do not interfere with each other during the mixture oxidation. This study can provide new inspiration for rational design of metal oxide catalysts to remove VOCs.
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高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
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IF 8.129
Ying Yang,Yingjie Li,Chunxiao Zhang,Zirui He,Jianli Zhao
CaO/CaCO 3 thermochemical heat storage has been considered as a competitive technology in concentrated solar power plants. Carbide slag and red mud are solid wastes from the chlor-alkali industry and aluminum industry, respectively. In this work, the red mud/Mn co-doped high alumina cement-stabilized carbide slag was synthesized for CaO/CaCO 3 heat storage. The effects of the addition of high alumina cement and red mud/Mn on the heat storage capacity, cyclic stability, and optical absorption of the modified carbide slag were investigated. The modified carbide slag exhibits excellent heat storage capacity and optical absorption. The Ca 3 Al 2 O 6 and CaMnO 3 inhibit the growth of CaO grains. FeMnO 3 and Ca 2 Fe 2 O 5 possess high optical absorption properties . The additions of Mn and red mud enhance the heat storage rate and basicity of the carbide slag. The effective conversion of the modified carbide slag is 0.62 after 30 cycles, which is 3.1 times as high as that of the untreated carbide slag. The modified carbide slag reaches the optical absorptance of ~58%, which is 6.5 times as high as that of the untreated one. Thus, the red mud/Mn co-doped high alumina cement-stabilized carbide slag is a potential candidate for the CaO/CaCO 3 heat storage system .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Manman Li,Kunlun Yang,Xin Huang,Shiguang Liu,Yifan Jia,Peng Gu,Hengfeng Miao
In this study, the flat microfiltration ceramic membrane (CM) was modified by wet impregnation method (Mn-Fe-CM) to catalyze ozone (O 3 ) for the oxidative degradation of trimethoprim (TMP). The conventional characterization test showed that the Mn-Fe binary oxides (Mn/FeO x ) with the crystal structure of FeMnO 3 were successfully loaded on the membrane and the catalytic performance of Mn-Fe-CM for O 3 was apparently enhanced as compared to CM. Consequently, compared with O 3 oxidation alone, the degradation and mineralization efficiencies of TMP in the O 3 /Mn-Fe-CM system were both improved and 98.6% of TMP could be removed within 10 min. The degradation efficiency of TMP decreased with the increasing pH and the addition of Cl - 、HCO 3 – 、PO 4 3- , while humic acid (HA) exhibited negative effect on the TMP removal. Radical scavenger experiment and electron paramagnetic resonance (EPR) analysis confirmed that direct oxidation by O 3 played an important role in the degradation of TMP, while hydroxyl radical (·OH) and 1 O 2 also participated. Fe(II) could act as an intermediate to transfer electrons and accelerate the transformation of Mn(III) to Mn(II) and Mn(IV) to Mn(III) during the ozonation process, which definitely strengthened the synergic catalytic effect of Mn-Fe-CM. The proposed degradation mechanism of TMP mainly contained hydroxylation , carbonylation , demethoxylation and deamination . Due to the strong catalytic ozonation performance for organic pollutants degradation, the O 3 /Mn-Fe-CM system revealed better anti-membrane fouling ability, strong cyclic usage performance and high applicability for the actual surface water treatment.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Qiao Li,Xinyue Ma,Chengsi Qi,Rui Li,Wei Zhang,Jiansheng Li,Jinyou Shen,Xiuyun Sun
Effective removal of Sb(III) and Sb(V) has long been an urgent task for protecting human health and environment. In this study, novel magnetic mesoporous Fe Mn binary oxides (MMFMs) were fabricated via calcinating the Mn encapsulated carboxymethyl cellulose-Fe(III) hydrogel, and the structure of MMFMs were closely related to the Fe:Mn ratio. Owing to the mesoporous structure together with synergistic effect of Fe Mn binary component, the MMFMs exhibited excellent mass transfer and adsorption ability to Sb(III) and Sb(V). MMFM 3 achieved a maximum Sb(III) and Sb(V) adsorption capacity of 281.5 and 204.6 mg/g, respectively. Co-existing anions of Cl − , NO 3 − and SO 4 2− exhibited marginal influence on the adsorption for both Sb(III) and Sb(V), except the PO 4 3− for Sb(III) and SiO 3 2− or PO 4 3− for Sb(V). X-ray photoelectron spectroscopic investigation revealed that high valence Mn(IV) was mainly responsible for the oxidation transformation of the highly toxic Sb(III) into less toxic Sb(V), while the FeO x content played major role for the adsorption of Sb(V). The generated inner-sphere Fe O Sb complex between Fe-OH groups and Sb(III/V) dominantly contributed to the removal of Sb(III/V). Overall, mesoporous structure, magnetic separation ability, excellent adsorption performance together with exceptional regeneration properties demonstrated the great potential of MMFMs for Sb(III/V) remediation.
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JOURNAL OF POWER SOURCES
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2023
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IF 9.2
Tao Huang,Xiangzhen Zheng,Chunfeng Yan,Ying Pan,Maoxiang Wu
1,3-Divinyltetramethyldisiloxane (DTMS) is a multifunctional additive that is used to improves the cycling stability and capacity retention of Li-rich Mn-based layered oxide cathodes (LRMs). Cycling performance evaluations demonstrate that LRM/Li cells without the additive exhibit lower capacity retention. DTMS can significantly improve the capacity retention of LRM/Li cells from 42.8% to 75% at 0.5C. Theoretical calculations indicate that DTMS is preferentially oxidized on the LRM surface. Physical characterization results reveal that DTMS generates a layer on the LRM surface that is both less resistive and thinner than the LRM by reacting with HF/F − from the electrolyte. This DTMS-derived layer inhibits adverse reactions between the cathode and electrolyte, thus, effectively maintaining the cathode structure.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Pengjia Sun,Jian Xiong,Ping Sun,Yingsen Fang,Hongxia Liu,Hui Liu,Bitao Xiong,Hui Wang,Xing'ao Li
Metal-doped g-C 3 N 4 materials have been extensively investigated and utilized as catalysts in the domain of wastewater treatment. In this study, additional O was introduced in Mn-doped g-C 3 N 4 (MCN) to synthesize Mn/O co-doped material (MOCN), and a new non-radical oxidation system of periodate (PI) activation with MOCN was established for degradation of pollutants. The results indicated that additional O doping can enhance the catalytic performance of MOCN. This was primarily demonstrated by the 3.5-fold increase in the degradation rate ( k ) of sulfadiazine (SDZ) by MOCN/PI system compared to MCN/PI one. Simultaneously, density functional theory (DFT) calculations have revealed that MOCN material exhibit a higher affinity for adsorbing PI (adsorption energy E ads = −4.992 eV), resulting in an elongation of the I-O bond length ( l I-O = 1.874 Å) and facilitating bond cleavage of PI to generate reactive active species (ROS). The reaction process was confirmed to be primarily driven by non-radical singlet oxygen ( 1 O 2 ), as demonstrated by electron paramagnetic resonance (EPR) and free radical quenching experiments. In addition, possible degradation pathways of SDZ were proposed based on the identified intermediate products and the calculated Fukui constants. The MOCN/PI catalytic system was highly efficient and environmentally friendly, with great potential for development in sewage treatment.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Rui Wang,Huizhi Hu,Danting Shi,Jinsong Liang,Senlin Shao
Biogenic manganese oxides (BioMnO x ) can effectively remove Mn(II) from drinking water. In the gravity-driven membrane (GDM) system for Mn(II)-containing water treatment, both BioMnO x and Mn(II)-oxidizing bacteria (MnOB) present in the cake layer, and their role in Mn(II) oxidation is still controversial. To address this issue, in this study, we naturally formed a cake layer containing BioMnO x and MnOB using the GDM process and identified the different roles of BioMnO x and MnOB in the removal of Mn(II). The experimental results showed that the BioMnO x accounted for a major proportion of the cake layer of GDM, and it played a principal role in the removal of Mn(II) through the combination of adsorption and catalytic oxidation. However, this removal efficiency would be continuously reduced in the absence of MnOB, while stabilized in the presence of MnOB. XPS analysis revealed that the proportion of Mn(III) and Mn(IV) in BioMnO x with MnOB reached 64.1% and 35.8%, respectively, while BioMnO x without MnOB did not contain Mn(IV). These findings suggest that BioMnO x may be the primary catalyst for Mn(II) oxidation, but its long-term activity is dependent on MnOB, which can maintain the catalytic activity by 1) producing new BioMnO x and 2) sustaining the high valence state of MnO x .
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Food Frontiers
·
2023
·Vol. 4
·期 4
·1913-1926
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IF 9.9
Chun-Yang Li,Lu Yang,Yingshuang Lu,Man-Man Wang,Jing-Min Liu,Shuo Wang
Photocatalysis-based advanced oxidation technologies have been developed as an attractive strategy for degrading pollutants. However, the question of how to increase removal specificity without sacrificing the degradation effect remains a difficult one. In this work, a photocatalytic system for the simultaneous targeted elimination of nine heterocyclic amines (HCAs) is established using a green-prepared photocatalyst (CN@Mn–FeOOH@MIP) that activates sodium persulfate (PS) under visible light. Mn–FeOOH clusters are in situ covered on laminar g-C 3 N 4 (CN) carrier to form a heterojunction, along with a molecularly imprinted layer self-polymerized from dopamine, which is grown on the outer layer, resulting in both the desired photochemical activity and specific sites for recognition. The conditions of composite and photocatalysis are explored and optimized for efficient and selective degradation. Notably, CN@Mn–FeOOH@MIP is synthesized free of any organic reagents, and the biosafety is confirmed by cellular and in vivo toxicity evaluation. The developed CN@Mn–FeOOH@MIP/PS system with visible-light-driven is applied to the removal of HCAs in coffee samples with the recoveries over 70% and the reuse rates greater than 85%. It coupled the advantages of specific enrichment and rapid degradation, which furnishes a novel approach for the control of trace thermal processing pollutants.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Qingwen Fan,Peng Fu,Elliot L. Bennett,Chaoyun Song,Yuchun Zhang
To achieve the coordination of energy density and power density, the metal oxide (MnO 2 ) that endow pseudo-capacitance in 3D porous carbon can build high energy density and specific capacitance at high-power density. Here we have showed the synthetization of a composites (JSPCC-MnO 2 ) with a specific capacitance of 310.6 F/g, an energy density of 42.4 Wh/kg, and a power density of 1425 W/kg. The percentage of pseudo-capacitance caused by the element Mn is 31.17 %, the pseudo-capacitance process of the JSPCC-MnO 2 has involved reversible charge transfer from Mn (II) to Mn (IV) to achieve high specific capacitance and energy density via multiple charge transfer dynamics. And the 3D micro-meso-macro porous structure has provided the electrolyte sufficient active sites and smooth ion migration channels. Atomic-scale information has been provided by classical molecular dynamics. In polarized states, the non-polar water molecular layer is at a higher energy level, and the electrostatic adsorption force between carbon atom and K ion is higher than the hydrophobic force of carbon. The loading MnO 2 has disturbed the density distribution in the local region, changed the ordered structure, and made the loading sites form defects. Green, affordable and renewable biomass has been used as the precursor achieving the high energy density of the carbon-based electrode.
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DESALINATION
·
2023
·
IF 9.9
Xueying Gao,Zhenzhen Fu,Yanfei Sun,Dewei Wang,Xiaoxuan Wang,Zishan Hou,Jinrui Wang,Xia Liu,Shiyu Wang,Shuyun Yao,Huiying Zhang,Shuyuan Li,Zheng Tang,Weijie Fu,Kaiqi Nie,Jiangzhou Xie,Zhiyu Yang,Yi-Ming Yan
While MnO 2 has been identified as a potent agent in the desalination process , its efficacy is significantly impeded by its inherent poor electrical conductivity and substantial ion diffusion barriers . By orchestrating an interfacial electron bridge within the MnO 2 /g-C 3 N 4 heterostructure , reinforced through N p z -Mn d z 2 orbital hybridization, we have managed to significantly boost both SAC and SAR in the HCDI process. The reinforced N p z -Mn d z 2 orbital hybridization triggers a substantial electron transition from g-C 3 N 4 to MnO 2 , culminating in a high Mn d z 2 electron occupancy. Further analysis reveals the formation of a Mn N chemical bond at the MnO 2 /g-C 3 N 4 interface, operating as an essential electron transfer bridge from g-C 3 N 4 to MnO 2 . This process concurrently initiates a rise in the Mn d z 2 orbital energy level, equipping the Mn d z 2 electron with superior redox activity. With these enhancements, the manufactured MnO 2 /g-C 3 N 4 exhibits exemplary performance, boasting an improved SAC of 68 mg g −1 and SAR of 3.6 mg g −1 min −1 with a decreased energy consumption of 0.7224 kWh kg −1 at 1.2 V. This innovative work offers an unconventional roadmap for activating electron redox activity and thereby accelerating charge transfer in transition metal oxides .
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Lin Zhang,Fenglian Fu,Guangda Yu,Guangzhao Sun,Bing Tang
Ferrihydrite-humic acid co-precipitates have impacts on the adsorption and reduction of Cr(VI) in the natural environment. Besides, ferrihydrite-humic acid co-precipitates usually coexist with foreign metal cations like Al(III) and Mn(II), which may change the properties of ferrihydrite and affect the fate of Cr(VI). In this work, structurally incorporated Al(III) or Mn(II) in ferrihydrite-humic acid co-precipitates with Cr(VI) (Fh-HA-Cr-Al or Fh-HA-Cr-Mn) were prepared, and the behavior and phase transformation of co-precipitates were explored via the characterization analyses of samples during aging for 10 days. This study showed that partial adsorbed Cr(VI) was reduced to Cr(III) in the presence of humic acid , thereby reducing the toxicity of Cr(VI). Interestingly, two different results occurred because of the incorporation of Al(III) and Mn(II). Al(III) hindered the transformation of ferrihydrite and changed the aging products by inhibiting the dissolution of ferrihydrite, which decreased Cr to incorporate iron minerals. By contrast, doping of Mn(II) accelerated the phase transformation of co-precipitates, and was more conducive to the encapsulation and fixation of Cr. The results of this study can facilitate the understanding of the effects of Al(III) and Mn(II) on Cr(VI) fixation during the aging of Fh-HA-Cr.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Lidong Kou,Jing Wang,Liang Zhao,Kai Jiang,Xinxin Xu
Conversion of waste sludge into biochar-based catalysts has been considered as a feasible alternative for sludge treatment, and dewatering of waste sludge is a key process for further treatment and disposal. In this study, KMnO 4 was used as both a chemical conditioner to assist Fe-rich sludge dewatering and a chemical modifier to incorporate Mn oxides into the biochar catalysts. Results showed that the sludge dewatering was substantially improved when KMnO 4 dosage was above 13% DS (dry sludge), and more than 99% of Mn was retained in the sludge cake. After pyrolysis of the sludge cake, a series of Mn,Fe-codoped biochar catalysts (assigned to x -Mn-FeBC) were obtained. The catalysts could activate peroxymonosulfate (PMS) well for complete removal of phenolic contaminants including phenol, bisphenol A (BPA) and 2,4-dichlorophenol (DCP) over a wide pH range (2.5–12) with the co-existence of water constituents. After 5 consecutive cycles, the catalytic performance of 13%-Mn-FeBC was decreased by half, but it could be fully recovered by simple calcination at 600 o C. It was proposed that radical and non-radical oxidation processes worked together for organic degradation, but non-radical pathways involving 1 O 2 oxidation and electron transfer between PMS and organic played more crucial roles. This study proposed a novel sludge treatment process by combining enhanced sludge dewatering with efficient catalyst preparation, and the as-prepared catalysts were promising in PMS activation and organic degradation.
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