Surface ammonification regulates oxygen vacancies and acidic sites in δ-MnO to enhance low-temperature selective catalytic oxidation activity of ammonia.

Selective catalytic oxidation (NH-SCO) is presently among the foremost technologies for eliminating the malodorous gaseous NH. Simultaneously achieving high NH conversion and high selectivity towards N at low temperatures poses a considerable hurdle. Surface oxygen vacancies and acidic sites, acting as adsorption and active sites in NH-SCO, hold the key to realizing efficient catalytic activity.

Cation-Induced Self-Assembly of α-MnO Nanowires into High-Purity Self-Standing Three-Dimensional Network Aerogels for Catalytic Decomposition of Carcinogenic Formaldehyde at Ambient Temperature.

Formaldehyde (HCHO), a ubiquitous gaseous pollutant in indoor environments, threatens human health under long-term exposure, necessitating its effective elimination. Due to its advantages in enhancing mass transfer and effectively exposing active sites, aerogels with a three-dimensional (3D) interconnected network structure are expected to achieve efficient and stable decomposition of HCHO at ambient temperature. However, how to realize the self-assembly of transition metal oxides to construct high-purity 3D network aerogels is still a huge challenge.

Sustainable design of photo-Fenton-like oxidation process in actual livestock wastewater through the highly dispersed FeCl anchoring on a g-CN substrate.

Photocatalytic technology emerges as a promising solution for the sustainable treatment of contaminated wastewater. However, the practical implementation of designed photocatalysts often faces challenges due to the intricate 'high carbon footprint' process and limited outdoor laboratory investigations. Herein, a simple yet versatile impregnation approach is proposed to anchor highly dispersed FeCl on a g-CN substrate (Fe-CN) with minimal energy consumption and post-processing.

A methodological review of compound-specific radiocarbon analysis for polycyclic aromatic hydrocarbons in environmental matrices.

Identifying the sources of polycyclic aromatic hydrocarbons (PAHs) in complex environmental matrices is essential for understanding the impact of combustion-related human activities on the environment. Since the turn of the century, advances in analytical capability and accuracy of accelerator mass spectrometry (AMS) have made it possible to accurately determine the source apportionment of PAHs based on their radiocarbon (C) mass conservation. This also allows us to trace the environmental transport processes of PAHs from the perspective of molecular C.

Different crystalline manganese dioxide and biochar co-conditioning aerobic composting: Reduced ammonia volatilization and improved organic fertilizer quality.

Aerobic composting is a sustainable and effective waste disposal method. However, it can generate massive amounts of ammonia (NH) via volatilization. Effectively reducing NH volatilization is vital for advancing aerobic composting and protecting the ecological environment.

Surface acidic sites strengthened core-shell HC@MnO for enhanced gaseous ammonia adsorption.

As a common gaseous pollutant in atmospheric environment, ammonia (NH) not only contributes to the formation of haze, but also disturb the nitrogen balance in ecosystem through atmospheric nitrogen deposition. Therefore, the control of NH emission has important environmental significance. Adsorption is the most commonly used technology for NH purification in practice, and efficient adsorbents are the key to adsorption method.

Engineering Manganese Defects in MnO for Catalytic Oxidation of Carcinogenic Formaldehyde.

Formaldehyde (HCHO) is a priority pollutant in the indoor environment, which is irritative and carcinogenic to humans. The non-noble metal oxides have a wide application prospect in the decomposition of HCHO. Defects in metal oxides have been widely accepted as active sites in heterogeneous catalysis.

Photoinduced Simultaneous Thermal and Photocatalytic Activities of MnO Revealed by Femtosecond Transient Absorption Spectroscopy.

Solar light-induced catalysis has recently received great interest in efficiently and economically degrading volatile organic compounds, which deteriorate indoor and outdoor air quality. However, a few studies explored its essential photophysical and photochemical processes. Herein, the femtosecond transient absorption spectroscopy was used to investigate the decay of photogenerated holes in MnO with different Mn vacancies.

Harvesting the vibration energy of α-MnO nanostructures for complete catalytic oxidation of carcinogenic airborne formaldehyde at ambient temperature.

Vibration is one of the most prevalent energy sources in natural environment, which can also be harvested and utilized to drive chemical reaction. Herein, mechanical vibration is used for enhancing the catalytic decomposition of formaldehyde at ambient temperature with the assistance of four well-defined morphologies α-MnO (nanowire, nanotube, nanorod and nanoflower). In particular, α-MnO nanowire exhibits the best catalytic activity, which can completely mineralize formaldehyde into carbon dioxide at ambient temperature by harvesting the vibration energy.

Scalable synthesis of water-dispersible 2D manganese dioxide monosheets.

2D nanomaterials with atomic thickness usually exhibit high specific surface areas and atom exposure rates, which are suitable for surface reaction related applications. In this study, we selected the oxalate ions as the structure-inducing agent to synthesize δ-MnO ultrathin nanosheets (~4.5 nm) via a facile hydrothermal method.

Degradation of TAIC by water falling film dielectric barrier discharge--influence of radical scavengers.

This work describes the application of plasma generated by water falling film dielectric barrier discharge for the degradation of triallyl isocyanurate (TAIC). The results indicated that TAIC solution of 1000mg/L was effectively removed within 60min treatment at 120W output power. Six intermediates were identified and a possible evolution of the TAIC degradation process was continuously proposed basing on the results of mass spectrum analysis.

Dielectric barrier discharge induced degradation of diclofenac in aqueous solution.

A dielectric barrier discharge (DBD) reactor as one of the advanced oxidation processes was applied to the degradation of diclofenac in aqueous solution. The various parameters that affect the degradation of diclofenac and the proposed evolutionary process were investigated. The results indicated that the inner concentrations of 10 mg/L diclofenac can be all removed within 10 min under conditions of 50 W and pH value of 6.