MnOx Surface Research Articles

Effects of Drying Operation on the Mn2+ Removal Activity of MnOx: Performance and Mechanism

Mn2+ is a prevalent contaminant in groundwater. In this study, manganese oxides (MnOx) were prepared via a redox method to remove Mn2+ from water. The effects of the drying operation in the preparation process, including heat drying at 20–120 °C with different times and freeze drying methods, on the structural properties, manganese removal performance and mechanisms were investigated. The results indicate that the drying conditions can significantly affect the removal performance and stability of MnOx. The MnOx dried at 50 °C for 12 h exhibited the best Mn2+ removal efficiency and stability, with an adsorption capacity of 125.7 mg/g and removal efficacy of 95.1% after six reuse cycles. The removal pathway experiments revealed that the sample dried at 50 °C for 12 h had superior catalytic oxidation abilities for Mn2+, while other samples removed Mn2+ by primarily relying on the adsorption process. The investigation of the structure revealed that excessive heat drying led to the shrinkage of the oxide particles, a reduction in the surface voids, and a decrease in the hydroxyl groups. Conversely, insufficient drying time or temperatures resulted in high water content in MnOx, which occupied the surface active sites. The XPS analysis indicated that the catalytic oxidation of Mn2+ primarily relied on Mn(III) and adsorbed oxygen on the surface of MnOx. With freeze drying or inadequate heat drying, a large amount of Mn(II) remained on the oxide surface, and the over-drying operation resulted in excessive conversion from Mn(II) to Mn(IV), reducing the catalytic activity and resulting in low removal stability.

Propane Dehydrogenation Over Silicalite‐1 Supported PtMn Catalyst with Low Pt Loading

AbstractPt‐based catalysts have been widely studied for propane dehydrogenation (PDH) because of their high activity and environmental sustainability. However, as a precious metal, the development of catalysts with high stability and low Pt content is of great significance. In this study, a series of silicalite‐1 (S‐1) supported PtMn (0.1PtxMn/S‐1) catalysts with low Pt loading amount (0.1 wt%) was prepared. The effects of different Mn loadings on the physicochemical properties and catalytic performance in the PDH reaction were studied. The addition of an appropriate amount of Mn regulated the dispersion of Pt particles and increased the number of active sites of the catalyst, enhancing the catalytic performance of PDH even at a low Pt loading. The initial propane conversion was 46.1% over 0.1Pt0.3Mn/S‐1 catalyst, and the deactivation rate constant was the lowest of 0.01 h−1. This may be because of an appropriate Mn loading was beneficial for enhancing the interaction between the metal and the support, forming MnOx is attached to the S‐1 surface, while the surface of MnOx stabilized the PtMn alloy, thereby improving the catalytic performance for PDH.

Highly coupled MnO2/Mn5O8 Z-scheme heterojunction modified by Co3O4 co-catalyst: An efficient and stable photocatalyst to decompose gaseous benzene

MnOx Z-scheme heterojunction exhibits a strong redox capacity, thereby it has great potential in the field of photocatalysis for gaseous benzene oxidation to address environmental pollution. However, the self-oxidation of MnOx due to the accumulation of photogenerated holes severely restricts its practical application. Herein, a highly coupled MnO2/Mn5O8 Z-scheme heterojunction modified by Co3O4 co-catalyst grown on ammoniated carbon cloth (MnOx/Co3O4@ACC) was constructed through electrodeposition and applied for efficient photocatalytic benzene degradation. The optimized MnOx/Co3O4@ACC presents high-efficient degradability, mineralization rate and high stability after 60 cycles (30 h). Co3O4 served as a hole collector to promote the extraction of photogenerated holes from the MnOx surface, suppressing the photocorrosion of MnOx. Additionally, the by-product CO was more easily absorbed and activated on MnOx/Co3O4@ACC surface due to the introduction of Co3O4. The electrodeposition-photocatalysis strategy developed in this work shows great application prospects for environmental contaminant remediation.

Oxidation and de-alloying of PtMn particle models: a computational investigation.

We present a computational study of the energetics and mechanisms of oxidation of Pt-Mn systems. We use slab models and simulate the oxidation process over the most stable (111) facet at a given Pt2Mn composition to make the problem computationally affordable, and combine Density-Functional Theory (DFT) with neural network potentials and metadynamics simulations to accelerate the mechanistic search. We find, first, that Mn has a strong tendency to alloy with Pt. This tendency is optimally realized when Pt and Mn are mixed in the bulk, but, at a composition in which the Mn content is high enough such as for Pt2Mn, Mn atoms will also be found in the surface outmost layer. These surface Mn atoms can dissociate O2 and generate MnOx species, transforming the surface-alloyed Mn atoms into MnOx surface oxide structures supported on a metallic framework in which one or more vacancy sites are simultaneously created. The thus-formed vacancies promote the successive steps of the oxidation process: the vacancy sites can be filled by surface oxygen atoms, which can then interact with Mn atoms in deeper layers, or subsurface Mn atoms can intercalate into interstitial sites. Both these steps facilitate the extraction of further bulk Mn atoms into MnOx oxide surface structures, and thus the progress of the oxidation process, with typical rate-determining energy barriers in the range 0.9-1.0 eV.

Enhanced Basicity of MnOx-Supported Ru for the Selective Oxidation of 5-Hydroxymethylfurfural to 2,5-Furandicarboxylic Acid.

The present study focused on developing a stable basic MnOx support for Ru (RuMn) for the efficient oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) in water in the absence of an external base. A series of MnOx supports, synthesized via hydrothermal approach using urea as precipitant, was prepared by thermal treatment at various temperatures (300-800 °C) before doping with Ru. The RuMn-2 (1 wt % Ru, MnOx calcined at 400 °C) possessed a large number of basic sites (1.72 mmol g-1 ) based on CO2 temperature-programmed desorption analysis, affording an FDCA yield of 87 % with a turnover frequency of 22 h-1 . Transmission electron microscopy energy-dispersive X-ray spectroscopy elemental mapping of RuMn-2 showed a high dispersion of Ru over the surface of MnOx, contributing to the efficient HMF oxidation. Moreover, X-ray diffraction, X-ray photoelectron spectroscopy, and H2 temperature-programmed reduction indicated that the predominant MnO2 phase (ϵ-MnO2 ) played a vital role in HMF oxidation. RuMn-2 was recyclable for up to four runs without significant loss in the activity and retained its structural integrity.

MXene nanofibers confining MnOx nanoparticles: a flexible anode for high-speed lithium ion storage networks.

The electron and ion conductivities of anode materials such as MnOx affect critically the properties of anodes in Li-ion batteries. Herein, a three-dimensional (3D) nanofiber network (MnOx-MXene/CNFs) for high-speed electron and ion transport with a MnOx surface anchored and embedded inside is designed via electrospinning manganese ion-modified MXene nanosheets and subsequent carbonization. Ion transport analysis reveals improved Li+ transport on the MnOx-MXene/CNF electrode and first-principles density functional theory (DFT) calculation elucidates the Li+ adsorption and storage mechanism. The surface-anchored MnOx nanoparticles form extremely strong bonds with the nanofibers, and the internally embedded MnOx nanoparticles, due to the fiber confinement effect, ensure the structural stability during charging and discharging, achieving the so-called dual stabilization strategies for cyclic fluctuation. By electrospinning, self-restacking of MXene flakes can be prevented, thereby giving rise to a larger surface area and more accessible active sites on the flexible anode. Benefiting from the 3D network with excellent conductivity and stability, at high current densities, the MnOx-MXene/CNF anode exhibits outstanding electrochemical characteristics. Even after 2000 cycles, a reversible capacity of 1098 mA h g-1 can be obtained at 2 A g-1 with only 0.007208% decay rate. The MnOx-MXene/CNF anode also shows a significant rate performance such as 1268 mA h g-1 at 2 A g-1 and 1137 mA h g-1 at 5 A g-1 corresponding to an area specific capacity of 2.536 mA h cm-2 at 4 mA cm-2 and 2.274 mA h cm-2 at 10 mA cm-2, respectively. The results indicate that the MnOx-MXene/CNF anode has excellent Li-ion storage properties and great commercial potential.

Engineering metal–metal oxide surfaces for high-performance oxygen reduction on Ag–Mn electrocatalysts

Diverse Ag–MnOxsurface sites/structures in Ag–Mn electrocatalysts afford robust local electronic structures tuned for efficient oxygen reduction.

Functions of MnOx in NaCl Aqueous Solution for Artificial Photosynthesis.

SummaryPhotoelectrochemical water splitting has been intensively investigated as artificial photosynthesis technology to convert solar energy into chemical energy. The use of seawater and salted water has advantages for minimum environmental burden; however, the oxidation of Cl− ion to hypochlorous acid (HClO), which has toxicity and heavy corrosiveness, should occur at the anode, along with the oxygen evolution. Here, O2 and HClO production in aqueous solution containing Cl− on photoanodes modified with various metal oxides was investigated. The modification of MnOx resulted in the promotion of the O2 evolution reaction (OER) specifically without HClO production over a wide range of conditions. The results will contribute not only to the practical application of artificial photosynthesis using salted water but also to the elucidation of substantial function of manganese as the element for OER center in natural photosynthesis.

(Invited) The Intersection of Battery and Capacitor Function in Nanostructured Manganese Oxides for Zinc-Ion Cells: Insights from 2D Interfaces to 3D Architectures

The primary alkaline Zn/MnO2 battery remains a ubiquitous energy-storage solution for many consumer uses, though its application space is narrowing due to limited rechargeability. The inherent cost and safety benefits of the Zn/MnO2 pairing electrodes can be translated to a new class of rechargeable “zinc-ion” batteries that are enabled by specific nanostructured manganese oxides that undergo reversible redox reactions in mild-pH Zn2+-based electrolytes. We are exploring two such MnOx polymorphs—layered, birnessite-type and cubic-spinel ZnMn2O4—for zinc-ion storage, where the oxide is expressed as a nanoscale coating on carbon nanofoam (CNF) paper substrates. The optimized electron/ion transport characteristics of MnOx–CNF electrode architectures ensures high oxide-normalized capacity delivered at moderate-to-high rates and over hundreds of charge–discharge cycles. Pseudocapacitive reactions at the MnOx are also activated when Na+ or Li+ salts are added to the Zn2+-based aqueous electrolyte, enabling pulse-power functionality at time scales approaching those for electrochemical capacitors [1]. Redox reactions at MnOx zinc-ion electrolytes may follow multiple pathways that including direct Zn2+ insertion/association and proton-insertion processes that shift local pH to induce the precipitation of Znx(OH)y(SO4)z at the MnOx surface. Ex situ characterization by diffraction, spectroscopy, and microscopy confirms that the latter process is dominant with birnessite-MnOx–CNF electrodes, with the reversibility of this complex precipitation/dissolution process promoted by the pore–solid architecture of the CNF [2]. To further unravel the mechanisms of Zn-ion storage, we examine 2D-planar MnOx–carbon electrodes that mimic the surfaces of their 3D counterparts, applying such in situ techniques as scanning-probe microscopy and quartz-crystal microbalance measurements. Insights from these investigations inform the design of advanced electrode architectures for high-performance, rechargeable zinc-ion batteries. [1] “Combining Battery-Like and Pseudocapacitive Charge Storage in 3D MnOx@Carbon Electrode Architectures in Zinc-Ion Cells.” J.S. Ko, M.B. Sassin, J.F. Parker, D.R. Rolison, and J.W. Long, Sustain. Energy Fuels, 2 (2018) 626–636. [2] J.S. Ko, M.D. Donakowski, M.B. Sassin, J.F. Parker, D.R. Rolison, and J.W. Long, MRS Comm., 9 (2019) 99–106.

(Invited) Electrochemical “Zinc-Ion” Storage at Nanostructured Manganese Oxides: Mechanistic Insights from 2D Interfaces to Advanced 3D Electrode Architectures

Alkaline Zn/MnO2 cells remain a popular energy-storage technology due to their low cost and benign components, yet they lack the long-term rechargeability and high-power capability required in many present and emerging applications. The benefits inherent to the coupling of zinc and manganese oxide (MnOx) electrodes can be translated to a new generation of rechargeable “zinc-ion” batteries that incorporate mild-pH Zn2+-containing electrolytes. By pairing such electrolytes with particular nanostructured forms of MnOx that undergo reversible Zn2+-based redox reactions, the rechargeability of Zn/MnOx systems can be extended to hundreds or thousands of cycles. We are exploring two particular MnOx polymorphs—layered, birnessite-type and cubic-spinel ZnMn2O4—for zinc-ion storage, where these oxides are expressed as nanoscale coatings on 3D carbon nanofoam (CNF) architectures. Such electrode designs enable high oxide-normalized capacity delivered at moderate-to-high rates and over hundreds of charge–discharge cycles. When Na+ or Li+ salts are added to the Zn2+-based aqueous electrolyte, pseudocapacitive reactions at the MnOx become active to provide pulse-power functionality at time scales approaching those for electrochemical capacitors [1]. Electrochemical charge storage in zinc-ion electrolytes may follow multiple pathways, including direct Zn2+ insertion/association at MnOx or via proton-insertion reactions that drive the formation of Znx(OH)y(SO4)z salts at the MnOx surface. We use ex situ characterization (diffraction, spectroscopy, and microscopy) of electrochemically conditioned MnOx–CNF electrodes to show that the latter reaction is dominant for birnessite-type MnOx, where the reversibility of Znx(OH)y(SO4)z formation/dissolution is promoted by the pore–solid architecture of the CNF [2]. These findings are further confirmed by scanning-probe microscopy and quartz-crystal microbalance techniques at planar MnOx–carbon electrodes that mimic the interfaces in MnOx–CNF. Insights from these investigations inform the design of advanced electrode architectures for high-performance, rechargeable zinc-ion batteries. [1] “Combining Battery-Like and Pseudocapacitive Charge Storage in 3D MnOx@Carbon Electrode Architectures in Zinc-Ion Cells.” J.S. Ko, M.B. Sassin, J.F. Parker, D.R. Rolison, and J.W. Long, Sustain. Energy Fuels, 2 (2018) 626–636. [2] J.S. Ko, M.D. Donakowski, M.B. Sassin, J.F. Parker, D.R. Rolison, and J.W. Long, MRS Comm., in press (2019).

Visible light-induced resistive switching behaviors in single MnOx nanorod: Reversing between resistor and memristor

Ultralong MnOx nanorods are synthesized using hydrothermal method. Lateral device of Ag|MnOx|Ag is fabricated using single MnOx nanorod with length of ∼20 μm and diameter of ∼120 nm. The device shows a typical resistor feature under dark, while it transfers from the resistor to a memristor under visible light. Our device gives evidence that the resistive switching (RS) memory behavior is feasible in microscale materials under visible light illumination. The RS behaviors are mainly dominated by the reaction, redistribution and migration of chemisorbed oxygen (Oxads−) of the MnOx surface. This work provides an insight into the physical mechanism of memristive system as well as memristor-based photodetector application.

Slow-releasing permanganate ions from permanganate core-manganese oxide shell particles for the oxidative degradation of an algae odorant in water

In this work, potassium permanganate particles (KMnO4) were modified with a manganese oxide (MnOx) shell comprising passages for the slow release of permanganate ions (MnO4–) in aquatic systems. The bare particle (KMnO4) and KMnO4 core-MnOx shell particles (CP-60) were characterized by attenuated total reflectance (ATR)-Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS). The CP-60 were evaluated as a slow source of MnO4− for the oxidative treatment of pure and lake water containing dimethyl trisulfide (DMTS), a water odorant produced by cyanobacteria in many eutrophic waters.XPS and ATR-FTIR results confirmed the presence of MnOx surface shell (diameter ∼ 1 μm) on CP-60. SEM images revealed cracks on CP-60, which serve as outlets for MnO4−. Approximately 0.76 ± 0.07 g KMnO4/g of CP-60 was released from the core of CP-60 after 120 min. The CP-60 degraded 88.9 ± 2.5% and 70.8 ± 6.3% of DMTS in pure water and lake water matrix within 120 min, respectively. The degradation was slightly more effective than the degradation using aqueous KMnO4 (74.2%) reported in literature. The release kinetics of the particles is consistent with a pseudo-first order equation with correlation coefficients of 0.99 and 0.97 in pure water and lake water matrix, respectively. The CP could serve as low cost slow-release particles for the degradation of micropollutants, even in cyanobacteria laden water. Notably, the in situ MnOx formed during the KMnO4 oxidation reaction can facilitate adsorption of organics and metal ions, improving water quality.

Boosting electrocatalytic N2 reduction by MnO2 with oxygen vacancies.

Here, we demonstrate the experimental verification of utilizing a MnO2 with oxygen vacancies (MnOx) nanowire array for high-performance and durable electrocatalytic reduction at neutral pH. Such MnOx nanoarray obtains a high rate of NH3 formation (1.63 × 10-10 mol cm-2 s-1) and a high Faradaic efficiency of 11.40%, which are much higher than those of its pristine MnO2 counterpart (2.3 × 10-11 mol cm-2 s-1; 1.96%). Density functional theory calculations demonstrate that the enhancement of N2 adsorption on the MnOx surface is due to stronger electronic interaction between the N2 molecule and the Mn6c atoms as a result of the oxygen vacancy. This work opens up a new avenue to explore oxygen nonstoichiometry toward the rational design of N2-fixing electrocatalysts with boosted performance for applications.

Effects of Solid-Phase Organic Carbon and Hydraulic Residence Time on Manganese(II) Removal in a Passive Coal Mine Drainage Treatment System

Passive treatment is a cost-effective method for Mn(II) removal from coal mine drainage via microbial oxidation and abiotic sorption/oxidation by Mn oxide (MnOx). Emplacement of solid-phase carbon within passive treatment systems to slowly release organic carbon has been proposed to enhance microbial Mn(II) removal. We tested the effects of wood chips as a solid-phase carbon source on Mn(II) removal efficiency. Both softwood (white pine) and hardwood (red oak) digestion solution (10 mg C/L) inhibited Mn(II) removal due to dissolution and coating of the reactive MnOx surface. Our results indicate that wood chips would not be a suitable solid-phase organic amendment for Mn removal. A strong linear correlation was observed between hydraulic residence time and Mn(II) removal rate.

Effects of preparation conditions on the performance of simultaneous desulfurization and denitrification over SiO 2 -MnO x composites

Abstract SiO2-MnOx composites were prepared by sol-gel method and used to simultaneously desulfurization and denitrification. The effects of TEOS (tetraethoxysilane) concentration, H2O concentration and ammonia concentration on the performance of simultaneous desulfurization and denitrification over the SiO2-MnOx composites were investigated. The experiment results showed that all of the SiO2-MnOx composites with a desulfurization efficiency of up to 100% in the experiment, while the denitrification efficiency was decreased from nearly 100% with the increasing of time. The SiO2-MnOx composite which was synthesized with 0.054 mol TEOS, 1.111 mol H2O, and 0.208 mol ammonia (TEOS: ammonia: H2O = 1.0: 3.9: 20.6) exhibited the best adsorption capacities of SO2 and NO, and the adsorption capacities of SO2 and NO were 0.0680 mmol/g and 0.1010mmoxl/g, respectively. The structure of the SiO2-MnOx composites, SiO2 distributed uniformly on the surface of MnOx, could reduce the adsorption inhibition of SO2 on NO, which was due to most of the SO2 could be adsorbed by the outer material (SiO2), while most of the NO molecules and the remaining SO2 enter into the inner layer and be adsorbed by MnOx. The urea treatment can increase the pore structure of the material by decomposing to produce NH3 and CO2, which made it easier for the gas to enter the material inside and improved the adsorption capacity of SO2 and NO. Based on the analysis of the TPD and FTIR spectra, it was apparent that the product of chemisorption was manganese nitrate, sulfuric acid and manganese sulfate.

Oxygen plasma-catalytic conversion of NO over MnOx: Formation and reactivity of adsorbed oxygen

Dielectric barrier discharge (DBD) reactor packed with a MnOx catalyst was used to investigate nitric oxide (NO) conversion. Characterization of MnOx with and without O2 plasma treatment was carried out by powder XRD, XAFS, XPS and BET methods. The results show that plasma treatment increases the adsorbed oxygen on the surface of MnOx catalyst, and also changes the oxidation state of partial concentration of Mn cation from Mn(III) to Mn(IV). Reactive surface oxygen species can be generated from lattice oxygen and/or direct interaction with plasma generated species. The adsorbed oxygen species formed on the catalyst surface of MnOx can enhance the oxidation performance of the plasma-catalytic process.

Catalytic Decomposition of Airborne Ozone by MnCO3 and its Mechanism

ABSTRACTOzone is an ubiquitous air pollutant. To develop a new kind of catalyst besides the usually used MnO2 for ozone decomposition, the sub-micrometer spherical MnCO3 was prepared via a facile co-precipitation method without additive agents at room temperature and characterized by XRD, BET, SEM, TGA, XPS and H2-TPR. As-prepared MnCO3 showed better catalytic activity for ozone decomposition than that of α-MnO2, which is frequently studied in the literature. Amorphous MnOx was found on the MnCO3 surface, and it further formed when MnCO3 was exposed to the ozone flow. The MnOx layer is regarded as the active component in the catalytic ozone decomposition and crystalline MnCO3 serves as the support-stabilizing MnOx surface phase. Then MnCO3 powder was supported on non-woven fabrics through a simple and low-cost impregnation method. The MnCO3-based non-woven fabrics exhibited 100% ozone conversion over 8 days at 25 °C with inlet ozone concentration 14 ppm and space velocity 42,000 h−1. This provides an alternative material for ozone-induced air cleaning.

Catalytic oxidation removal of ammonium from groundwater by manganese oxides filter: Performance and mechanisms

High concentration of ammonium (NH4+) often occurs in groundwater. In this study, the behavior of NH4+ catalytic oxidation by a manganese oxide (MnOx) filter was investigated systematically and the formation and evolution of the MnOx films were characterized extensively. It was found that the MnOx based filter could be successfully started up within 6days with the NH4+ removal efficiency increasing from 1 to 96%. After start-up, the removal efficiency of NH4+ could keep almost constant under different operating conditions, implying the MnOx filter has a good stability towards NH4+ removal. Both X-ray diffraction (XRD) and Raman results suggested that MnOx was related to hexagonal birnessite which has low crystallinity and small crystallite sizes. The X-ray photoelectron spectroscopy (XPS) spectra of the Mn2p taken on the surface of MnOx revealed Mn(II), Mn(III) and Mn(IV) species existed in MnOx materials and their atomic concentrations were 20.2%, 57.8% and 22%, respectively. More importantly, the catalysis of films towards NH4+ oxidation was expected to be closely related to its feature structure. Specifically, the ability of manganese to cycle between +2, +3 and +4 oxidation states during catalysis was considered to play important roles in the NH4+ conversion on MnOx surface. Based on the above discussion, three major steps involve in NH4+ catalytic oxidation by MnOx were proposed, which are NH4+ adsorption, catalytic oxidation, and desorption of reaction products.

Birnessite-Type Manganese Oxide on Granular Activated Carbon for Formaldehyde Removal at Room Temperature

Formaldehyde (HCHO) is a priority indoor air pollutant due to its adverse impact to human health. A layer of birnessite-type manganese oxide (MnOx) was facilely coated on the granular activated carbon (AC) via in situ reduction of permanganate with AC at room temperature. The properties and growing process of MnOx were characterized by scanning electron microscopy, energy-dispersive spectrometry, high-resolution transmission electron microscopy, X-ray diffraction, and Raman. As-prepared MnOx/AC exhibited high activity in removing HCHO at room temperature. Gas chromatography analysis indicates that removed HCHO can be finally transformed into CO2 for a much longer time. Accumulation of carbonate on the surface of MnOx and partial hydroxylation of MnOx lead to the deactivation of MnOx/AC. However, the deactivated sample can be regenerated at 60 °C for 2 h. These results indicate that as-prepared MnOx/AC can be applied for indoor air purification due to its easy preparation and regeneration and high activity...

Spectroscopic Investigation of Interfacial Interaction of Manganese Oxide with Triclosan, Aniline, and Phenol

We investigated the reaction of manganese oxide [MnOx(s)] with phenol, aniline, and triclosan in batch experiments using X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and aqueous chemistry measurements. Analyses of XPS high-resolution spectra suggest that the Mn(III) content increased 8-10% and the content of Mn(II) increased 12-15% in the surface of reacted MnOx(s) compared to the control, indicating that the oxidation of organic compounds causes the reduction of MnOx(s). Fitting of C 1s XPS spectra suggests an increase in the number of aromatic and aliphatic bonds for MnOx(s) reacted with organic compounds. The presence of 2.7% Cl in the MnOx(s) surface after reaction with triclosan was detected by XPS survey scans, while no Cl was detected in MnOx-phenol, MnOx-aniline, and MnOx-control. Raman spectra confirm the increased intensity of carbon features in MnOx(s) samples that reacted with organic compounds compared to unreacted MnOx(s). These spectroscopy results indicate that phenol, aniline, triclosan, and related byproducts are associated with the surface of MnOx(s)-reacted samples. The results from this research contribute to a better understanding of interactions between MnOx(s) and organic compounds that are relevant to natural and engineered environments.