WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 236
·期 10
·1-17
·
IF 3
Zang Shuyan,Zong Sitong,Wei Lan,Liu Lihong,Zhang Renhao,Kou Wei
Arsenic (As) contamination poses severe environmental risks, especially for developing countries. In this paper, an innovative binary (Mn and -SH) multifunctional adsorbent, ZIF-67-SH@Mn, was successfully synthesized as a prospective absorbent to efficiently remove As(III) from wastewater. The structure of ZIF-67-SH@Mn was characterized before and after the adsorption of As(III) using SEM–EDS, FTIR, BET, pH pzc and XRD. SEM–EDS confirmed the successful introduction of Mn and S, BET analysis revealed a high specific surface area of 197.21 m 2 /g, and FTIR demonstrated the key role of -SH groups in As(III) coordination. These findings indicate that Mn oxidation and -SH bonding synergistically enhance As(III) removal. The leaching experiment showed that the release amounts of Mn 2 ⁺ and Co 2 ⁺ from the adsorbent within 48 h complies with national standards. Batch adsorption experiments determined the optimal conditions: initial concentration 1 mg/L, temperature 298 K, pH 5, reaction time 4 h, and using an ultra-low adsorbent dosage ZIF-67-SH@Mn only 0.2 g/L, achieving As(III) removal efficiency of 70.33% and a maximum adsorption capacity of 21.84 mg/g. The adsorbent achieved 79.36% As(III) removal efficiency in river (RW) and wine water (WW), with RW ≥ WW ≥ DI performance regardless of initial concentration. The adsorption of As(III) by ZIF-67-SH@Mn followed pseudo-second-order kinetics and the Langmuir model, indicating a chemisorption-dominated and monolayer adsorption process. Thermodynamic analysis revealed a spontaneous and endothermic process. The intraparticle diffusion model indicated that particle internal diffusion not only determines the adsorption process but also plays an important role in surface adsorption in the rate-determining step. The adsorption mechanism of ZIF-67-SH@Mn for As(III) involved electrostatic adsorption, multifunctional group interactions (including -NH, -OH, -SH), and oxidation. ZIF-67-SH@Mn exhibits excellent As(III) removal efficiency and is a highly efficient, low-cost adsorbent with good application prospects in wastewater remediation.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 14
·831
·
IF 2.8
Zhao Tianqun,Zeng Tianrui,Jin Shilei,Li Xiaohui,Yu Zhiqiang
BNT (BaO–Nd 2 O 3 –TiO 2 ) system was modified via doping using sol–gel method, and BNST-Mn/PTFE microwave dielectric composite was prepared by mechanical blending. Scanning electron microscopy (SEM), thermal dilatometer, and split post-dielectric resonator (SPDR) were used to characterize the microstructure, dielectric properties, and thermal properties of the composite materials. The results indicate that as the amount of ceramic filler supplied grows, the agglomeration of fillers becomes more pronounced. At a filler content of 10 wt%, the dispersion of the filler in the matrix resin is relatively uniform. The dielectric constant and dielectric loss of the composites increased, and the bonding ability between the two phases diminished with the increase in filler content. When the mass fraction of the ceramic was increased to 70 wt%, the dielectric constant of the composite was 10.92 and the Q·f value was measured at 3584 GHz. At the same time, the coefficient of thermal expansion (CTE) of the composites reached 23 ppm/°C, which was a good compatibility with the copper foil. Lichtenecker equation, Maxwell–Wagner equation, Jayasundere–Smith equation, and effective medium theory equation (EMT) were used to predict the dielectric constant of the composites. In comparison, the dielectric constant values calculated using the EMT equation were in good agreement with the experimental values, especially at low filling volumes. Also, the simulation results of the thermal expansion coefficient of composite materials using the Lichtenecker equation and its improved form are in good agreement with the experimental values.
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高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Shengfeng Yang,Qingchao Xiao,Bin Li,Tao Zhou,Qihong Cen,Zewei Liu,Yue Zhou
Heavy metal contamination, particularly by lead and cadmium, poses a significant environmental challenge. Indiscriminate disposal of crop residues exacerbates environmental concerns. In this study, broad bean straw was utilized to produce biochar (BC), and further modifications were made using FeCl 3 -6 H 2 O and KMnO 4 to obtain Iron-Manganese Modified Biochar (FMBC) for remediating cadmium and lead-contaminated soil. Results show that both BC and FMBC increased soil pH, available phosphorus, and potassium compared to the control groups. Adding 5 % BC led to a notable reduction of 60.98 % in available cadmium and 51.63 % in available lead. Simultaneously, FMBC decreased active cadmium and lead by 57.51–73.73 % and 52.25–69.87 %, respectively. Furthermore, FMBC decreased the content of cadmium and lead in the unstable state while increasing content in the residual state, demonstrating its ability to reduce accumulation in plant tissues. FMBC adsorption mechanisms primarily involve surface complexation and co-precipitation, where oxygen-containing functional groups form stable complexes with free cadmium and lead ions. In conclusion, FMBC proved to be an effective, environmentally friendly soil remediation agent with strong adsorption capabilities and a prolonged shelf-life. This provides a promising solution to alleviate the pollution of heavy metals such as cadmium and lead in soil.
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高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Jingyu Ren,Yanzhong Zhen,Jian Wang,Jie Li
In this study, caffeic acid (CA) was degraded by electrical discharge plasma combined with Mn doped CoOOH catalyst. Doping of Mn significantly improve the catalytic activity of CoOOH. CA degradation efficiency was 75.6% with dielectric barrier discharge treatment for 10 min, and it reached 97% using CoOOH as the catalyst at the same treatment time. CA was 100% degraded with only 8 min using Mn/CoOOH as the catalyst. The introduction of Mn into the lattice of CoOOH induced the formation of oxygen vacancy , causing part of coordinate number of Co decreased from 6 to 5, and thus produces unsaturated Co to be the Lewis acid sites. Lewis acid sites (unsaturated Co) could coordinate with O 3 and H 2 O 2 and break their chemical bonds to form O and –OH. Assisting in the conversion of O 3 to ·OH was the main role of H 2 O 2 in the catalytic process. The degradation products and pathway of CA were studied by three-dimensional fluorescence, liquid chromatograph-mass spectrometer and density functional theory calculations.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Zhongjun Zhao,Yiran Sun,Yihao Pan,Jing Liu,Jingkai Zhou,Mei Ma,Xiaozhong Wu,Xiangyan Shen,Jin Zhou,Pengfei Zhou
Layered Mn-based cathode (K x MnO 2 ) has attracted wide attention for potassium ion batteries (PIBs) because of its high specific capacity and energy density. However, the structure and capacity of K x MnO 2 cathode are constantly degraded during the cycling due to the strong Jahn-Teller effect of Mn 3+ and huge ionic radius of K + . In this work, lithium ion and interlayer water were introduced into Mn layer and K layer in order to suppress the Jahn-Teller effect and expand interlayer spacing, respectively, thus obtaining new types of K 0.4 Mn 1-x Li x O 2 ·0.33H 2 O cathode materials. The interlayer spacing of the K 0.4 MnO 2 increased from 6.34 to 6.93 Å after the interlayer water insertion. X-ray photoelectron spectroscopy studies demonstrated that proper lithium doping can effectively control the ratio of Mn 3+ /Mn 4+ and inhibit the Jahn-Teller effect. In-situ X-ray diffraction exhibited that lithium doping can inhibit the irreversible phase transition and improve the structural stability of materials during cycling. As a result, the optimal K 0.4 Mn 0.9 Li 0.1 O 2 ·0.33H 2 O not only delivered a higher capacity retention of 84.04 % compared to the value of 28.09 % for K 0.4 MnO 2 ·0.33H 2 O, but also maintained a greatly enhanced rate capability. This study provides a new opportunity for designing layered manganese-based cathode materials with high performance for PIBs.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Jinyan Cao,Jianjun Li,Wei Chu,Wanglai Cen
Manganese-doped bismuth oxychloride (Mn-BiOCl) photocatalysts were facilely synthesized for the photodegradation of metronidazole (MTZ), and the as-prepared Mn-BiOCl was systematically characterized. The results show that the introduction of Mn 2+ to BiOCl increases its MTZ removal efficiency through increasing its specific surface area, broadening its light absorption region, and facilitating photoinduced carrier separation. The enhancement of the optical properties is ascribed to the generation of an intermediate Mn 3p-O 2d energy level in the forbidden gap of Mn-BiOCl based on the density functional theory calculations. Mn-BiOCl also exhibited favorable stability and recyclability after four cycles. Moreover, the results of the quenching experiments indicate that superoxide radicals (O 2 − ), hydroxyl radicals (OH ) and holes ( h + ) participated in MTZ degradation over Mn-BiOCl, and the electron spin resonance (ESR) test demonstrated that more OH was generated in the Mn-BiOCl process than the BiOCl process. This was explained by the H 2 O adsorption energy and bond parameter on the photocatalyst’s surface. Finally, the photodegradation pathway of MTZ was elaborated based on the intermediate analysis, and a mechanism for the promotion of MTZ photodegradation through Mn-doping BiOCl was proposed.
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高影响因子
Energy Material Advances
·
2022
·
IF 0
Renjie He,Sheng Lei,Mengchuang Liu,Mingsheng Qin,Wei Zhong,Shijie Cheng,Jia Xie
Microspinel LiMn2O4 (LMO) is a widely used cathode material in power lithium-ion batteries. However, inevitable Mn dissolution and dynamic phase instability will cause the degradation of microspinel LMO during cycling. Here, a low-tortuosity LMO (LMO-LT) electrode is fabricated by an ice-templating method, which exhibits enhanced dynamic phase stability, alleviated Mn dissolution, and rare particle microcracks during cycling. It is shown that the low-tortuosity electrode enables fast lithium-ion diffusion and thus small concentration polarization, leading to uniform electrochemical reaction within microregions of the LMO-LT electrode. Furthermore, the fast lithium-ion transport kinetics and even mesoscopic scale reactions of the LMO-LT electrode effectively alleviate irreversible phase transition and Mn dissolution as well as suppress crack generation in LMO particles. As a result, the full cell [negative-to-positive capacity ratio (N/P) = 1.1] with thick LMO-LT cathode (13 mg cm−2) and Li4Ti5O12 anode sustains 80.0% capacity over 200 cycles. The LMO-LT electrode further delivers 78.9% capacity of that at 0.1 C at the high rate of 5 C. This work provides an important strategy to enhance dynamic phase stability and suppress Mn dissolution at the mesoscopic scale, promoting the development of high-performance LMO electrodes.
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Journal of Superconductivity and Novel Magnetism
·
2024
·Vol. 37
·期 4
·667-675
·
IF 1.6
Wu Diandian,Liu Xiansong,Han Yuyan,Feng Shuangjiu,Lv Qingrong
A sample of Y 2.85 Ca 0.15 Sn 0.08 Ti 0.05 Mn 0.07 Fe 4.8 O 12 doped with four different ions was prepared using the solid method and a subsequent procedure. X-ray diffraction (XRD), energy-dispersive X-ray (EDX), and scanning electron microscope (SEM) were used to analyze the sample’s structural features, elemental distribution, and surface morphology. The study used the B-H magnetic characteristic analyzer and superconducting quantum interferometer magnetic performance measurement system to analyze the magnetic properties of Y 2.85 Ca 0.15 Sn 0.08 Ti 0.05 Mn 0.07 Fe 4.8 O 12 . The correlation becomes more surprising as the frequency increases, indicating a decrease in permeability when the magnetic field H reaches 200 A/m. Ion substitution leads to changes in magnetic crystal anisotropy, affecting permeability as the external magnetic field strength increases. We analyze the correlation between saturation magnetization and temperature in the 520–540 K range and explain the variation of saturation magnetization with temperature. The study shows that saturation magnetization decreases as temperature increases. This result suggests that saturation magnetization decreases as temperature increases. The increased super-exchange effect due to Ti and Mn occupying the (d) sites is much stronger than the reduced effect caused by Sn occupying the (a) sites. Therefore, the saturation magnetization of the Y 2.85 Ca 0.15 Sn 0.08 Ti 0.05 Mn 0.07 Fe 4.8 O 12 sample is higher than that of the undoped sample. The Curie temperature (Tc) of the Y 2.85 Ca 0.15 Sn 0.08 Ti 0.05 Mn 0.07 Fe 4.8 O 12 sample is lower than that of the undoped sample.
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高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 21
·期 44
·17972-17977
·
IF 5.101
Pengtao Shao,Hongzhi Wang,Qinghong Zhang,Yaogang Li
Mn-doped ZnSe nanocrystals (Mn:ZnSe d-dots) that emit white light were synthesized in aqueous media in microfluidic reactors. White light emission from Mn:ZnSe d-dots was a result of combined emission of blue light (emission from non-coordinated surface selenium sites) and yellow light (4T1 → 6A1 emission from Mn2+ ions). Emission from non-coordinated surface selenium sites was realized by adjusting the ratio of the flow volumes of [Zn]/[Mn] and the mass of stabilizer added. Photoluminescence from the Mn:ZnSe d-dots was easily tuned from 580 to 602 nm by regulating flow volume. Under the optimal experimental conditions, Mn:ZnSe d-dots that emit white light with a quantum yield of about 10.2% were fabricated.
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高影响因子
CHEMICAL ENGINEERING & TECHNOLOGY
·
2015
·Vol. 38
·期 2
·291-296
·
IF 2.442
Chen Zhou,Yexin Zhang,Lingjun Hu,Hongfeng Yin,Wei Guo Wang
Mn-doped La 0.8 Sr 0.2 CoO 3 perovskite oxides (La 0.8 Sr 0.2 Co 1– x Mn x O 3 ; x = 0, 0.1, 0.3, 0.5) were synthesized by a modified sol-gel method. The phase-pure oxides were obtained. CoO and carbonates were formed on the surface of La 0.8 Sr 0.2 CoO 3 . With increasing doping content, these impurities were reduced while the stability of the perovskite structure was improved. The valence state of B-site ions and the amount of absorbed oxygen were influenced by Mn doping. The catalytic activity of the perovskite catalysts was investigated for CO oxidation and simultaneous removal of CO, C 3 H 8 , and NO. For CO and NO removal, La 0.8 Sr 0.2 Co 0.9 Mn 0.1 O 3 exhibited the best performance. For C 3 H 8 removal, the reactivity was promoted linearly with the doping content. The structure-activity relationship is also discussed.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2022
·
IF 5.6
Lei Han,Xi Yuan,Zitong Wang,Jie Hua,Jin Wang,Jinju Zheng,Jialong Zhao
Mn-doped two-dimensional lead halide perovskites nanoplatelets (NPLs) possess promising application in solid state lighting. The Mn:L 2 [CsPbBr 3 ]PbBr 4 NPLs with corporation of Cd 2+ were prepared via a hot injection method. The photoluminescence (PL) properties the NPLs with different Mn/Pb/Cd molar ratio from 0.5/1/0 to 5/1/3 were investigated by steady-state and time-resolved PL spectroscopy, indicating that the doping efficiency of Mn 2+ can be boosted by adding Cd 2+ to the NPLs. After thermal annealing, the PL quantum yield of Mn 2+ ions reached up to 75%, which is Cd 2+ content dependent. The temperature-dependent PL spectra demonstrated that the thermal activation energies of the NPLs could be increased by incorporating Cd 2+ , meaning that the nonradiative defect/trap states were effectively suppressed. These experimental results suggested the PL properties of Mn:L 2 [CsPbBr 3 ]PbBr 4 NPLs were optimized by adding Cd 2+ ions.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yihao Liu,Nian Ran,Riyue Ge,Jianjun Liu,Wenxian Li,Yingying Chen,Lingyan Feng,Renchao Che
Transition metal phosphides (TMP) show great potential to alternative noble metal based electrocatalysts for oxygen evolution reaction (OER) electrolysis but the still unsatisfactory catalytic activity hinders its practical application. Therefore, it is of much significance to rationally design TMP electrocatalysts for achieving high-efficiency OER. Here, we design Mn-doped cobalt phosphide (Mn-CoP) porous nanosheets for highly active OER through the in-situ metal acetate hydroxide transformation and subsequent phosphidation treatment. Benefiting from synergistic effects of the porous structure, high density of active sites and improved charge-transfer capability, the optimized Mn-CoP serving as a pre-catalyst shows an impressive alkaline OER performance with a low overpotential of 288 mV at the current density of 10 mA cm −2 and high stability. Post-electrolysis characterizations show the conversion from Mn-CoP to vertical Mn-CoOOH hexagonal nanosheets during OER, in which the transformed Mn-CoOOH not only provide extra active sites, but serve as the highly active species. Density functional theory (DFT) calculations reveal that Mn doping can increase the gap states near the Fermi level of active O sites, endowing facilitated deprotonation of OH* to O* and reducing the energy barrier of rate-determining step. This protocol provides a novel insight for the construction of highly efficient TMP water oxidation electrocatalysts.
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