CHEMOSPHERE
·
2024
·
IF 8.1
Yanfang Huang,Meimei Wang,Bingbing Liu,Shengpeng Su,Hu Sun,Shuzhen Yang,Guihong Han
Ion precipitation flotation technology was demonstrated to be an efficient method for the separation of valuable metals from low-concentration solution. However, the selective separation of three metals from mixing solution is a great challenge, and highly selective reagents are the key to polymetallic separation. In this work, stepwise separation of Co and Zn from the simulated zinc hydrometallurgy wastewater containing ternary Co–Zn–Mn metals by ion precipitation flotation process was proposed. It's demonstrated that organic reagents of 1-nitroso-2-naphthol (NN) and sodium dimethyldithiocarbamate (SDDC) had excellent selectivity for the capture of Co and Zn to form respective precipitate from wastewaters via the chelation reactions. After precipitation, dodecylpyridinium chloride (DPC) and tetradecyltrimethylammonium bromide (TTAB) were chosen as surfactants for the separation of Co and Zn sediments from the solution via the flotation process. The effects of solution pH, molar ratio, reaction temperature, and reaction time on the selective precipitation efficiencies of Co and Zn as well as the effects of surfactant dosage and flotation gas velocity on the flotation separation efficiencies were systematically investigated. It's demonstrated that the comprehensive recovery rates of Co, Mn, and Zn reach 98%, 90%, and 99%, respectively. After separation, oxidation calcination of the foam products was conducted to prepare high-purity Co 3 O 4 and ZnO nanoparticles in which the organic matters were burnt out with gas emissions. The stepwise chelation capture mechanisms of Co and Zn by highly selective precipitation reagents were minutely discussed. It's demonstrated that the proposed selective stepwise precipitation and flotation method is suitable for recovery of critical metal ions from low-concentration polymetallic wastewaters.
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PubMed
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Haishuo Wang,Xuefeng Ge,Shiyin Li,Heyong Huang
Dissolved organic matter (DOM) plays an important role in metal migration and transformation within inland surface waters . In our study, spectroscopic and dialysis equilibrium analysis were combined to characterize the binding properties between DOM and Fe(II)/Mn(II). Four different type of DOM including two commercial DOM: humic acid、fulvic acid, and two natural dissolved organic matter collected from macrophyte-dominant region (MDR) and algae-dominated region (ADR) of Taihu Lake. Steady state/time resolved fluorescence spectroscopy indicated that the fluorescence intensity of DOM was quenched by Fe(II)/Mn(II) through a static quenching process. The adsorption isotherm shows that the adsorption capacity of DOM from Taihu Lake for metal ions is significantly higher than that of commercial humic acid . Simultaneously, the combination of MDR and Fe(II) has the highest adsorption capacity at 110.950 mg/g among all combinations. Furthermore, the Pseudo-second-order kinetic model and Elovich model were found to be superior in describing the adsorption process , with chemical adsorption controlling the rate of the adsorption reaction. The results of this study show that potentially toxic elements (PETs) pollution in eutrophic shallow lakes may become more serious due to the excessive expansion of algae dominant regions and the reduction of macrophyte dominant regions. In addition, risk analysis and assessment of PETs should consider the contribution of metal binding capabilities.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·
IF 0
Wang Fei,Jin Yulong,Xue Yun,Yu Shuihang,Liu Na,Ma Qingxiang,Xu Jie,Xue Bing,Wei Xuejiao
It is desirable but challenging to develop highly-efficient catalysts for the direct synthesis of dimethyl carbonate (DMC) from methanol and CO 2 . The vacancy-mediated incorporation of heteroatom into surface reconstruction is an efficient method of defect engineering for enhancing the catalytic properties. In this work, manganese-doped cerium oxide porous nanoribbons (Mn/CeO 2 -BTC) were prepared derived from a Ce-BTC by a sacrificial template approach. It is found that the catalytic activity of Mn/CeO 2 -BTC catalysts can be readily controlled by varying the amount of Mn dopants and the as-synthesized 0.1-Mn/CeO 2 -BTC exhibited an outstanding activity for the synthesis of DMC from CO 2 and methanol, which reached a high DMC yield (6.53 mmol DMC /g cat. ) without any dehydrating agents. Based on characterization results, the enhanced performance may be attributed to the defective structures caused by Mn doping and the porous nanoribbons of the CeO 2 crystals, which provide more surface oxygen vacancies and acidic-basic sites, favoring adsorption and activation of CO 2 and methanol.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Bingbing Liu,Yifei Zhang,Peidong Yang,Yanfang Huang,Yubin Xue,Hu Sun,Shuzhen Yang,Guihong Han
Zinc electrolyte crystallization sediment (ZECS) generated in the zinc hydrometallugy industry contains valuable metals of strontium (Sr), manganese (Mn), and zinc (Zn), which has economical value but poses potential detrimental to the environment. However, the extraction and recovery of Sr is extremely difficult due to the thermodynamically stable Ca and Sr sulfate cocrystallization structure in ZECS. The destruction of refractory sulfate cocrystallization structure is a prerequisite for Sr extraction, and the carbothermal reduction roasting method is demonstrated to be efficient for the phase reconstruction. In this study, a stepwise Sr, Mn, and Zn recovery process from ZECS via carbothermal reduction roasting-acid leaching-selective precipitation-multistage extraction was proposed. In the reduction roasting procedure, all the sulfates including CaSO 4 , SrSO 4 , and Ca 0.7 Sr 0.3 SO 4 are reduced to soluble sulfides. Meanwhile, most MnO 2 is converted to a low-valence Mn product (MnO) that is soluble in acid, and the reduced Zn (g) is volatilized which can be collected from the flue dust. In the acid leaching procedure, the leaching efficiencies of Sr, Ca, and Mn are as high as 97.34%, 97.44%, and 95.49% respectively, while 99.50% Si in the form of silica is enriched in the leaching residue. After that, high-purity Sr solution was obtained after selective precipitation for Mn removal and D2EHPA multistage extraction for Ca removal. 97.41% Mn in the leaching solution is precipitated by adjusting the pH value to 9.5 with NaOH solution. After four-stage extraction, 79.60% Sr and only 0.35% Ca are retained in the aqueous phase. The purified solution contains 2.88 g/L Sr, 0.052 g/L Ca, and 0.014 g/L Mn, which can be used to prepare industrial SrCO 3 product via the carbonation operation. Thermodynamic behavior and reduction roasting reconstruction mechanism of Ca and Sr sulfate cocrystallization structure in ZECS were discussed in this work. The distributions of main metal elements (Sr, Ca, Mn, and Zn) in ZECS during the carbothermal reduction roasting-acid leaching-selective precipitation-multistage extraction process were also systematically studied.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Tianbao Xie,Rongxia Huang,Junhui Tan,Yan ning Luo,Hua-Tay Lin,Yejing Dai
CaBi 2 Nb 2 O 9 (CBN) is a bismuth layered ferroelectric material with extremely high Curie temperature and low dielectric loss, which has great application potential in ultra-high temperature field. However, because of its low piezoelectric coefficient, its practical application still faces great challenges. This study successfully prepared Ca 1-x Ce x Bi 2 Nb 1.98 (W 2/3 Mn 1/3 ) 0.02 O 9 ( x = 0–0.05) two-layer ferroelectric ceramics using direct-reaction sintering method. A pseudo tetragonal structure was successfully constructed near x = 0.02 using the substitution method of Ce 4+ at site A, and W 6+ and Mn 4+ at site B, which altered the crystal structure of CBN based ceramics. The properties of CBN-based piezoelectric ceramics have been significantly improved by this modification. It has a higher piezoelectric constant ( d 33 = 20.6 pC/N) and Curie temperature ( T c = 950 °C), while having a lower dielectric loss (tan δ = 0.031 at 500 °C). In addition, CaBi 2 Nb 2 O 9 based piezoelectric ceramics also show excellent thermal stability. After annealing at 900 °C for 2 h, the d 33 value remained high at 19.2 pC/N, retaining about 93.2% of its original value. Therefore, these findings indicate that Ca 1-x Ce x Bi 2 Nb 1.98 (W 2/3 Mn 1/3 ) 0.02 O 9 is a high-temperature piezoelectric material with great potential.
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高影响因子
MATERIALS SCIENCE & ENGINEERING R-REPORTS
·
2024
·
IF 31.6
Peilin Cao,Cong Wang,Shichao Niu,Zhiwu Han,Linpeng Liu,Ji’an Duan
Highly sensitive flexible force sensors enable precise detection of underwater signals for monitoring biological activity, environmental conditions, and vehicle movement. Multilayer stack assembly and micro/nano structure array are often seen in most force/pressure sensors which are toughly hard to control the interlayer spacing and micro/nano structures alignment precisely, resulting in poor consistency and stability. Herein, we first reported a new force sensor with a nature-inspired minimalistic architecture, addressing such issues in an elegant and surprising approach by using a single-layer arched functional membrane with one microgroove. Inspired by the scorpions’ slit sensilla and mantis’ campaniform sensilla, a highly sensitive and waterproof flexible force sensor was fabricated. It is demonstrated that the force sensor has a sensitivity of 27.6 N −1 , a high force resolution (1 mN), a fast response time of 70 ms, excellent stability over 5000 cycles and linearity (0.996), and a small force detection limit (≤ 1 mN), showing great potential in underwater environment sensing and motion monitoring of vehicles. This novel but minimalistic architecture provides a new direction in the development of sensors with advanced performance.
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高影响因子
FOOD CHEMISTRY
·
2026
·
IF 10.4
Lin Fan,Xuemei Wang,Zhen Zhang,Rao Peng,Weibo Li,Dong Xu,Xinzhen Du,Xiaoquan Lu
Methyl parathion (MP) is a highly toxic organophosphorus pesticide and poses a serious threat to food safety and public health. Herein, an integrated sensing platform combining hollow Mn-doped ZIF-67 with carboxylated carbon nanotubes to form a heterojunction (H-Mn/ZIF-67@COOH-CNTs) was successfully fabricated for sensitive recognition and ultrafast removal of MP. The constructed sensing platform demonstrated excellent analytical performance for MP under optimized conditions, featuring a broad linear range of 0.3–100 μM and a low detection limit of 0.024 μM. Furthermore, H-Mn/ZIF-67@COOH-CNTs achieved rapid removal of MP. The Langmuir fitting yielded a theoretical maximum adsorption capacity of 584.8 mg·g −1 , while a removal efficiency of 92.52% was achieved within 5 min. This research provides a reliable platform for the sensitive detection of MP in fruits and vegetables and its rapid removal from aqueous solutions, while offering novel insights for designing high-performance electrocatalysts in environmental monitoring and food safety testing.
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高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2021
·
IF 9.028
Ming-Kun Ke,Gui-Xiang Huang,Shu-Chuan Mei,Zhao-Hua Wang,Ying-Jie Zhang,Tian-Wei Hua,Li-Rong Zheng,Han-Qing Yu
As one of the extensively used feed additives in livestock and poultry breeding, p-arsanilic acid (p-ASA) has become an organoarsenic pollutant with great concern. For the efficient removal of p-ASA from water, the combination of chemical oxidation and adsorption is recognized as a promising process. Herein, hollow/porous Mn–Fe-mixed oxide (MnFeO) nanocubes were synthesized and used in coupling with peroxymonosulfate (PMS) to oxidize p-ASA and remove the total arsenic (As). Under acidic conditions, both p-ASA and total As could be completely removed in the PMS/MnFeO process and the overall performance was substantially better than that of the Mn/Fe monometallic system. More importantly, an interface-promoted direct oxidation mechanism was found in the p-ASA-involved PMS/MnFeO system. Rather than activate PMS to generate reactive oxygen species (i.e., SO4·–, ·OH, and 1O2), the MnFeO nanocubes first adsorbed p-ASA to form a ligand–oxide interface, which improved the oxidation of the adsorbed p-ASA by PMS and ultimately enhanced the removal of the total As. Such a direct oxidation process achieved selective oxidation of p-ASA and avoidance of severe interference from the commonly present constituents in real water samples. After facile elution with dilute alkali solution, the used MnFeO nanocubes exhibited superior recyclability in the repeated p-ASA removal experiments. Therefore, this work provides a promising approach for efficient abatement of phenylarsenical-caused water pollution based on the PMS/MnFeO oxidation process.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhuoyao Fang,Siyuan Pan,Xiaolin Zhang,Lu Lv,Bingcai Pan
Efficient removal of As(III) from groundwater remains an urgent but still challenging task. The X-Mn (X = Fe, Zr, Al…) binary oxide nanoparticles enable simultaneous oxidation and sequestration of As(III), yet facing the challenges in facile synthesis of the ultra-small nanoparticles with extraordinary decontamination reactivity, and in effective regeneration of oxidation capability. Herein, we prepared a novel nanocomposite Zr-Mn@N201 by conducting stepwise precipitation of hydrated oxides of zirconium (HZO) and manganese (HMO) inside the commercial gel-type anion exchanger N201, i.e. , the quaternary ammoniated poly(styrene-co-divinylbenzene) bead. Owing to restriction of nanopores, the HZO/HMO inside N201 possessed an ultra-small size around 4.78 nm. The kinetics and spectroscopic results suggested that As(III) was transformed into As(V) by HMO prior to adsorption onto HZO, and the negatively charged HMO captured most of the produced Mn 2+ ions. Alkaline treatment could regenerate Zr-Mn@N201 through simultaneously desorbing As(V) and transforming Mn 2+ into HMO again. During a 10-cyclic adsorption-regeneration assay, Zr-Mn@N201 could steadily reduce As(III) from 500 μg/L to < 10 μg/L with negligible HMO loss (<0.3%) in each run. In fixed-bed assays, the integration of HMO increased the effective treatment amounts of the Zr-Mn@N201 column toward the realistic groundwater by ∼ 11.5 times over the single nano-HZO ( i.e. , HZO@N201) column, reaching to ∼ 4600 bed volume with < 1% HMO loss.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 1
·487-492
·
IF 1.798
Zhang Xinxiu,Liu Jinsong,Zhu Kongjun,Wang Jing,Li Ziquan,Qiu Jinhao
High-quality lead-free piezoelectric x Mn-doped (K 0.48 Na 0.52 ) 0.985 Li 0.015 NbO 3 films (KNLN; x = 0, 0.01, 0.02, 0.03) were successfully deposited onto Pt(111)/Ti/SiO 2 /Si(100) substrates by sol–gel method. Effects of Mn substitution on the microstructure, dielectric properties, ferroelectric properties, and leakage current of the KNLN films were investigated in detail. Mn-doping can significantly improve the ferroelectric properties and decrease the leakage current of KNLN films. Optimal dielectric properties were obtained in films doped with 2 mol% Mn, whose dielectric constant and dielectric loss at 1 kHz were 875 and 0.030, respectively. In addition, well-saturated ferroelectric P - E hysteresis loop with large remanent polarization (2 P
r ) and coercive field ( E
c ) of 22.5 μC/cm 2 and 65 kV/cm were obtained in 2 mol% Mn-doped KNLN film at an applied electric field of 200 kV/cm.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Yuling Chen,Wei Huang,Chendi Wang,Xinyu Zhai,Ting Zhang,Yang Wang,Xiaoya Hu
Metalloporphyrinic frameworks have demonstrated to be an alternative candidate for natural enzymes due to their diverse structures and unique peroxidase-mimicking properties. In this study, a manganese–metalloporphyrin framework (PCN-222(Mn)) was synthesized as a biomimetic metal–organic framework (MOF). This catalyst exhibited highly intrinsic peroxidase-like activity with 3,3′,5,5′-tetramethylbenzidine as the chromogenic substrate. Additionally, a higher peroxidase-like activity was observed in a wider pH range (from 3.0 to 8.0), which is undoubtedly advantageous for PCN-222(Mn) to detect H2O2 under physiological and pathological environments. Based on the excellent peroxidase-mimicking activities of PCN-222(Mn), a novel hydrogen peroxide (H2O2) nonenzymic amperometric biosensor was constructed through electro-polymerizing a conductive and stable poly-glutamic acid (PGA) film on the surface of a PCN-222(Mn)-modified electrode (PGA/PCN-222(Mn)/GCE). Resulting from the synergistic activity of PCN-222(Mn) and PGA film, a sensitive, selective, and reliable method was established for H2O2 detection with a linear range of 5 × 10–7 to 1.01 × 10–3 mol/L and detection limit of 3.1 × 10–8 mol/L. In addition, PGA/PCN-222(Mn) has a long-term stability and can be used over 90 cycles without any decrease in analytical performance. These outstanding performances of the developed approach in sensitive and selective determination of H2O2 from human serum provides effective proof for its potential application in monitoring low-abundance H2O2 from complicated biological samples. This research not only expands the electrochemical applications of metalloporphyrin frameworks but also demonstrates a promising strategy for increasing the conductivity and stability of MOF-based electrode materials.
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高影响因子
IONICS
·
2018
·Vol. 25
·期 6
·2585-2594
·
IF 2.347
Meng Fanbo,Guo Huajun,Wang Zhixing,Wang Jiexi,Yan Guochun,Wu Xianwen,Li Xinhai,Zhou Lijiao
A series of layered Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 cathode materials, of which manganese source was electrolytic manganese dioxide, with different contents of SO 4 2− were successfully synthesized via ball-milling process and solid-state sintering method. The obtained materials were characterized by XRD, XPS, SEM-EDS, C-S, ICP, and HR-TEM. All the obtained materials presented well-ordered layered structure. When the content of SO 4 2− was below 1.30 wt%, the electrochemical properties and structural stabilities at low rate for the layered materials with SO 4 2− were not changed dramatically, while when the content of SO 4 2− increased to 5.85 wt%, the initial discharge capacities decreased dramatically from 248.24 to 209.23 mAh g −1 at 10 mA g −1 . And the pristine sample shows excellent cyclic property and rate capability. It delivered the discharge capacity of 175.25 mAh g −1 after 100 cycles with the highest capacity retention of 90.67% at 200 mA g −1 . Particularly, the treated Li-rich Mn-based materials with the highest amount of SO 4 2− exhibited the best cyclic stability and it delivers the highest capacity retention of 95.17% after 100 cycles at 200 mA g −1 . However, its discharge capacities were much lower than the pristine material. As a result, the addition of SO 4 2− could promote side reactions between electrode and electrolyte and deep-degree corrosion of electrode materials to affect the electrochemical properties and structural stabilities of the Li-rich Mn-based materials.
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高影响因子
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