JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Zheng Wang,Hui Li,Chuang Jiang,Wenya Liu,Siyu Zhang,Yibin Zhou,Kang Liu,Yaqing Xiao,Ruyan Hou,Xiaochun Wan,Yingnan Liu
Herein, a novel dual-mode probe for organophosphorus pesticides (OPs) colorimetric and photothermal detection was developed based on manganese modified porphyrin metal–organic framework (PCN-224-Mn). PCN-224-Mn had excellent oxidase-like activity and oxidized colorless 3,3,5,5-tetramethylbenzidine (TMB) to blue–green oxidation state TMB (oxTMB), which exhibited high temperature under near-infrared irradiation. l -ascorbate-2-phosphate was hydrolyzed by acid phosphatase to produce ascorbic acid, which weakened colorimetric and photothermal signals by impacting oxTMB generation. The presence of OPs blocked the production of ascorbic acid by irreversibly inhibiting the activity of acid phosphatase, causing the restoration of chromogenic reaction and the increase of temperature. Under the optimal conditions, the probe showed a good linear response to OPs in the concentration range of 5 ∼ 10000 ng/mL, using glyphosate as the analog. The detection limits of glyphosate in colorimetric mode and photothermal mode were 1.47 ng/mL and 2.00 ng/mL, respectively. The probe was successfully used for sensitive identification of OPs residues in tea, brown rice, and wheat flour. This work proposes a simple and reliable colorimetric/photothermal platform for OPs identification, which overcomes the problem that single-mode detection probes are susceptible to external factors, and has broad application potential in the field of food safety.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Shu-Xiang Xiang,Jin-Peng Wang,Su Gao,Zhan-Kuo Guo,Hui-Lin Jiang,Bao-Xia Dong,Yun-Lei Teng
The CH 4 yield over dual functional materials (DFMs) remains low and requires further improvement. In this work, we first examined the influence of Mn on the performance of the Ni-CaO/γ-Al 2 O 3 DFM for CO 2 capture and in situ methanation. Our results showed that the MnNi-DFM-3 (MnNi-CaO/γ-Al 2 O 3 DFM) exhibited the best performance at 350 °C, with a CH 4 yield of 0.56 mmol/g which is 4 times higher than that of the Ni-DFM-1 (Ni-CaO/γ-Al 2 O 3 DFM) (0.14 mmol/g). Nanoscale characterization revealed that highly scattered Mn 3 O 4 acted as a barrier preventing the agglomeration of Ni-based catalysts. Furthermore, our density functional theory (DFT) analysis demonstrated that the introduction of Mn enhanced the activation of CO 2 , promoted the dissociation of H 2 and intermediates, and reduced the activation energy needed to produce carboxylic acid intermediates on the Ni catalyst. The prepared MnNi-DFM is promising to be a cheap efficient material for CO 2 capture and in situ methanation. This work opens up a new pathway for enhancing the performance of DFMs using inexpensive transition metals.
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MICROCHEMICAL JOURNAL
·
2024
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IF 4.9
Fang Li,Nuotong Shen,Qingcheng Li,Chen Yang,Limin Zhang,Mingjin Wang
The development of microfluidic flow injection analysis (FIA) system for simultaneous and real-time detection of multiple metal ions is of great importance for environmental monitoring, food safety and industrial field. In this work, a multiplexed microfluidic chip based FIA system was fabricated for simultaneous determination of three metal ions, by using Fe(III), Mn(II) and Cu(II) as models. The multiplexed microfluidic chip based FIA system is composed of three parts, including a multi-channel FIA system for solution manipulation, a group of microfluidic chips for reagents mixing and reaction, and one fiber optic spectrometer for fast and real-time absorbance signal detection. The sample solution and chromogenic reagents were injected into the microfluidic chips to carry out specific colorimetric reactions. Fe(III), Mn(II) and Cu(II) reacts with 5-sulfosalicylic acid, formaldoxime, and bis(cyclohexanone) oxalyldihydrazone, respectively, to generate orange, ember and blue colored solution with peak absorbance at 420 nm, 450 nm, and 600 nm, respectively. The absorbance signal of the generated three channels of solution can be sequentially detected by using only one mini spectrometer. The linear detection range for Fe(III), Mn(II) and Cu(II) is 0.1–20 mg/L, 0.1–12 mg/L and 0.2–12 mg/L, respectively. The limit of detection for Fe(III), Mn(II) and Cu(II) is 0.07, 0.02 and 0.1 mg/L respectively. And the limit of quantification for Fe(III), Mn(II) and Cu(II) is 0.2, 0.07 and 0.3 mg/L, respectively. The recoveries of spiked Fe (III), Mn (II), and Cu (II) in real water samples are between 95.3 % to 106 %. Finally, the developed microfluidic chip based FIA system was successfully applied to simultaneous determination of three metal ions in environmental water samples and zinc smelting solution from zinc hydrometallurgy industry with satisfied results.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Tingting Zhu,Xin Song,Tianle Li,Junpeng Hu,Kai Qi,Panting Gao,Rongji Cui,Zhicheng Tang
The biological fermentation industry faces a challenge in simultaneously purifying complex sulfur-containing volatile organic compounds (VOCs) and reducing tail gas emissions. This is due to the multi-step purification process required for sulfur-containing VOCs and the high energy usage involved. The adsorption performance and controllability of elements in hydrotalcite-like compounds are noteworthy and have the potential to enhance the catalytic purification of sulfur-containing VOCs. This study utilizes Mn-based hydrotalcite-like compounds as a highly efficient catalyst for the simultaneous catalytic removal of complex sulfur-containing VOCs such as ethanol (C 2 H 5 OH), acetaldehyde (CH 3 CHO), and diethyl sulfide (C 4 H 10 S). The study successfully achieves the simultaneous and efficient removal of sulfur-containing VOCs at a temperature of 325 °C. The removal rates of three types of gas pollutants can reach 100 % for 420 min, 450 min, and 360 min, respectively. Meanwhile, the VOCs breakthrough capacity is 426 mg/g. The competitive adsorption effect, adsorption sites, and reaction mechanism were investigated using experimental and theoretical calculation methods. The simultaneous adsorption of three gases resulted in competitive adsorption, with the priority order of adsorption being CH 3 CHO > C 4 H 10 S > C 2 H 5 OH. The various adsorption effects were attributed to the formation of Mg–O–H…O-C, O…O=C, and Mn–O–H…S-C, respectively. CH 3 CHO was initially adsorbed at the O-Top site, while C 4 H 10 S was adsorbed at the Mn-Top site. C 2 H 5 OH was adsorbed at the Mg-Top site. High-temperatures promote the oxidation of elemental S to sulfate. The primary reason for catalyst deactivation is the buildup and coating of sulfate on the surface of the catalyst. The main active sites responsible for the catalytic oxidation of C 4 H 10 S were Mn 2+ and Mn 3+ . The oxygen defects act as active sites for the oxidation of C 2 H 5 OH and CH 3 CHO. C 2 H 5 OH undergoes gradual oxidation to form CH 3 CHO and CH 3 COOH (acetic acid), which are further oxidized to CO 2 and H 2 O. C 4 H 10 S was oxidized to elemental S and eventually to sulfate. The experimental results in this work are consistent with the theoretical results, providing a theoretical basis for the simultaneous catalytic removal of sulfur-containing VOCs.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Yi Ma,Luming Li,Yong Zhang,Ning Jian,Huiyan Pan,Jie Deng,Junshan Li
Electrochemical upgrading methanol into value-added formate at the anode in alkaline media enables the boosting production of hydrogen fuel at the cathode with saved energy. To achieve such a cost-effective and efficient electrocatalytic process, herein this work presents a Mn-doped nickel iron layered double hydroxides supported on nickel foam, derived from a simple hydrothermal synthesis. This developed electrocatalyst could act as an efficient bifunctional electrocatalyst for methanol-to-formate with a high faradaic efficiency of nearly 100 %, and for hydrogen evolution reaction, at an external potential of 1.5 V versus reversible hydrogen electrode. Additionally, a current density of 131.1 mA cm −2 with a decay of merely 12.2 % over 120 h continuous long-term testing was generated in co-electrocatalysis of water/methanol solution. Further density functional theoretical calculations were used to unravel the methanol-to-formate reaction mechanism arising from the doping of Fe and/or Mn. This work offers a good example of co-electrocatalysis to produce formate and green hydrogen fuel using a bifunctional electrocatalyst.
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Chemistry-An Asian Journal
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2024
·Vol. 19
·期 15
·e202400482
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IF 3.5
Jiahua Wu,Xuan Yang,Dong Xu,Say Leong Ong,Jiangyong Hu
While numerous persulfate-based advanced oxidation processes (AOPs) have been studied based on fancy catalysts, the practical combination of Fe or Mn modified granular activated carbon (GAC) has seldom been investigated. The present study focused on a green and readily synthesized Fe−Mn bimetallic oxide doped GAC (Fe−Mn@GAC), to uncover its catalytic kinetics and mechanism when used in the peroxydisulfate (PDS)-based oxidation process for degrading Rhodamine B (RhB), a representative xenobiotic dye. The synthesized Fe−Mn@GAC was characterized by SEM-EDS, XRD, ICP-OES and XPS analyses to confirm its physicochemical properties. The catalytic kinetics of Fe−Mn@GAC+PDS system were evaluated under varying conditions, including PDS and catalyst dosages, solution pH, and the presence of anions. It was found Fe−Mn@GAC exhibited robust catalytic performance, being insensitive to a wide pH range from 3 to 11, and the presence of anions such as Cl − , SO 4 2− , NO 3 − and CO 3 2− . The catalytic mechanism was investigated by EPR and quenching experiments. The results indicated the catalytic system processed a non-radical oxidation pathway, dominated by direct electron transfer between RhB and Fe−Mn@GAC, with singlet oxygen ( 1 O 2 ) playing a secondary role. The catalytic system also managed to maintain a RhB removal above 81 % in successive 10 cycles, and recover to 89.5 % after simple DI water rinse, showing great reusability. The catalytic system was further challenged by real dye-containing wastewater, achieving a decolorization rate of 84.5 %. This work not only provides fresh insight into the kinetics and mechanism of the Fe−Mn@GAC+PDS catalytic system, but also demonstrates its potential in the practical application in real dye-containing wastewater treatment.
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Inorganic Chemistry Frontiers
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2024
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IF 6.1
Sidan Wang,Pei Wang,Guojun Zhou,Nan Zhang,Yilin Mao,Xian-Ming Zhang
Low-dimensional chiral metal halides (CMHs) are promising as an industrialized platform for chiral recognition applications; however, there are hardly any luminescent CMHs with variable energy transfer between an organic ligand and an inorganic unit. Herein, an array of rare one-dimensional (1D) luminescent CMHs were engineered by screening R/S-3-aminopiperidine dihydrochloride as a chiral template, in which the chirality of the organic cation is transferred to the inorganic chain via hydrogen bonding interactions in (R/S-C5H14N2)MCl4·H2O (M = Mn, Cd), abbreviated as R/S-Mn and R/S-Cd. The orange emission at 607 nm is attributed to the d–d transition 4T1(G)–6A1(S) of Mn2+ in R/S-Mn, along with an energy transfer from the organic cation to the inorganic chain. In contrast, a reverse energy transfer from the inorganic chain to the organic cation was verified in R/S-Cd, with the emission at 401 nm being attributed to the singlet self-trapped excitons (STEs) of Cd2+. Beyond that, we innovatively proposed that the fluorescence quenching behaviour contributes to the strong stereo-selective fluorescence responsivity for mandelic acid (MA), confirming that R/S-Mn and R/S-Cd are useful for the rapid recognition of R/S-MA. This research not only promotes the discovery of low-dimensional luminescent CMHs but also expands their applications in bio-detection and sensing.
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ACS Omega
·
2024
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IF 3.7
Qingjing Liu,Ruisheng Wang,Ranjia Li,Xiaosheng Wang,Suoqi Zhao,Changchun Yu
Mn–Na2WO4-based catalysts with different supports were prepared using the incipient wetness impregnation method and evaluated for their oxidative coupling of methane (OCM) reaction performance. The results demonstrated that the SiO2- supported catalyst exhibited the best catalytic performance, and the introduction of H2O further enhanced its activity. Under the conditions of a feed gas mixture of CH4/O2/H2O = 6:1:24 at 800 °C and atmospheric pressure, the CH4 conversion and C2+ selectivity over the Mn–Na2WO4/SiO2 catalyst increased from 28.4% and 77.4% (without H2O) to 33.2% and 84.9%, respectively. In contrast, the catalytic activity using TiO2 and MgO supports drastically declined. Characterizations using X-ray diffraction (XRD), in situ infrared spectroscopy (In-situ IR), X-ray photoelectron spectroscopy (XPS), hydrogen temperature-programmed reduction (H2-TPR), and oxygen temperature-programmed desorption (O2-TPD) revealed that the introduction of steam not only served as a diluent to decrease the partial pressures of the reactants CH4 and O2, thereby reducing deep oxidation reactions in the gas phase, but also interacted with surface oxygen species (O22–) and silica to form adjacent surface-bonded disilanol free radicals Si–OIH. This interaction facilitated the dehydrogenation and coupling of two methane molecules on the catalyst surface, resulting in the generation of C2+ products, significantly enhancing the catalytic activity and selectivity of OCM.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Shuangjun Li,Xiangping Xiao,Luyang Zuo,Rui Li,Lijun Liu,Huitao Fan,Bo Li,Liya Wang
Designing semiconductor photocatalysts with unique structures can improve the transfer efficiency of solar energy to hydrogen (H 2 ). In this study, a dual modification method of element doping and morphological control was used. The Mn-doped hollow octahedron ZnIn 2 S 4 (ZHO-Mn) was synthesized by a simple one-pot solvothermal method using the octahedral Mn-based metal–organic framework (Mn-MOF) as a template. Experiments and theoretical calculations show that the ZHO-Mn has additional active sites, strong light absorption ability and good photoelectric performance. The H 2 production performance of optimized ZHO-Mn10 was the best (11.9 mmol h −1 g −1 ), which was 7.4 times that of monomer ZnIn 2 S 4 (1.6 mmol h −1 g −1 ). This study provides a new one-step method for the dual control of doping and morphology of ZnIn 2 S 4 photocatalyst
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Materials Today Chemistry
·
2025
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IF 6.7
Qing Chen,Xinyu Zou,Ling Shi,Maocong Hu,Mao Peng,Zhenhua Yao
While bifunctional electrocatalysts enabling both oxygen reduction (ORR) and oxygen evolution (OER) reactions are recognized as pivotal chemical steps for next-generation energy devices, their practical implementation persists as a formidable scientific challenge. In this study, hetero-structured catalyst (CrFeCoNiCu/Mn 3 O 4 /MnO/NC) was successfully synthesized in situ containing both high-entropy alloy and spinel manganese-based oxide by a simple heat treatment process while two control samples (CrFeCoNiCu/Mn 3 O 4 /NC and CrFeCoNiCu/NC) were also prepared. It exhibited excellent catalytic performance and stability for both ORR and OER compared with commercial Pt/C and RuO 2 catalysts. The superior bifunctional performance was further observed with the overpotential gaps (ΔE gap ) of the three electrodes being 0.634 V, 0.655 V, and 0.698 V, respectively, which were lower than those of the combination of RuO 2 and Pt/C at 0.723 V. The enhanced catalytic performance was subsequently corroborated by density-functional theory (DFT). This study proposes an alternative method for the synthesis and design of high-performance bifunctional electrocatalysts.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2025
·
IF 1.6
Liu Xinying,Lei Yuhan,Shi Jialin,Wang Zixuan,Zhang Wenxiu,Zhang Guanghui,Gu Ping
A novel adsorbent, Mn-MOF-74, was synthesized using a room-temperature, water-based method by assembling Mn 2+ metal nodes with 2,5-dihydroxyterephthalic acid ligands, and was further applied for Co 2+ removal. Mn-MOF-74 exhibited minimal pH dependence within a pH range of 3–8.5, achieving Co 2+ removal efficiencies between 92.5 and 96.3%, with a distribution coefficient of up to 2.9 × 10 4 mL·g −1 . A function relationship between the Co 2+ removal efficiency and the adsorbent dosage or initial concentration was proposed. The dominant removal mechanism was identified as ion exchange between Mn 2+ and Co 2+ , with chemisorption being the primary rate-limiting step.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Nan Li,Haibo Liu,Bin Yang,Bo Xie,Yangtao Wu,Lingjun Bu,Shiqing Zhou
This study establishes a manganese-activated ferrate (Mn(II)/Fe(VI)) process for autonomous Microcystis aeruginosa removal, addressing the critical challenge of additive dependency and secondary pollution in conventional algal control strategies. System performance was critically governed by Mn/Fe stoichiometric ratios and total oxidant dosages, with near-complete algal elimination (>98 %) achieved at Mn/Fe = 1:1 (≥200 μM total dosage) while maintaining cell integrity. TOC analysis revealed dosage-dependent control over cellular lysis and intracellular organic matter (IOM) releasing. Spectroscopic characterization demonstrated process efficacy in degrading dissolved organics through decreased UV 254 absorbance (unsaturation reduction), declining SUVA (aromaticity loss), and elevated E2/E3 ratios (molecular weight reduction). Comparative analyses identified dissolved organic carbon as a more sensitive cellular stress indicator than K + release, attributed to MnO 2 adsorptive sequestration of released intracellular constituents. Mechanistic investigations revealed dual role of Mn(II) that rapid surface accumulation provided oxidative protection, while subsequent Fe(VI)-driven MnO x formation enabled floc growth through particle bridging. Water matrix effects followed valence-specific modulation, where divalent cations (Ca 2+ /Mg 2+ ) enhanced removal via charge screening, and excessive monovalent ions (Na + /NH 4 + ) impaired efficiency through ionic strength interference. This work pioneers a green oxidation-coagulation synergy that eliminates supplemental additives, offering a sustainable paradigm for mitigating cell rupture and IOM release in algae-laden water treatment.
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