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Humic Substances Affect Iron Wheel-Driven Hydroxyl Radical Production
Hydroxyl radical (.OH) is the most reactive oxidant, which plays important roles in the biogeochemical cycle of elements and the attenuation of contaminants in the environment. In recent years, the redox reaction of iron in subsurface sediments was found to produce .OH naturally, even in dark conditions without the presence of exogenous hydrogen peroxide. However, the effect...
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In-situ Construction of Manganese Oxide Photothermocatalyst to Deep Removal of Toluene by Highly Utilizing Sunlight Energy
Volatile organic compounds (VOCs) emitted from anthropogenic and natural sources come into human living space and cause endanger to human health. Moreover, VOCs are major precursor leading to ozone and secondary organic aerosols (SOAs) in the atmosphere. Photocatalysis and catalytic oxidation are effective degradation methods for VOCs removal. However, for the degradation of...
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Institute of Urban Environment has made progress in the study of light-permeable washable nanofibrous air filters
Fine particulate matter (PM2.5) poses a threat to human health. Fiber filtration is the most popular and effective method for removing fine particulate matter. The ZHENG Yuming group at the Institute of Urban Environment of the Chinese Academy of Sciences has devoted a significant work on the development of high-efficiency air filters, such as the electret fibrous filters wi...
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Scientists reveal the mechanism of carbon source influence on methane production in iron-rich paddy soils
As an important source of methane emissions, rice fields account for 20% of global methane emissions and have a serious impact on global climate change. Paddy soils are rich in iron (Fe), and their redox processes are critical to the biogeochemical cycling of rice-field systems. However, it is not clear how iron oxides regulate the methanogenic capacity of different carbon s...
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Effect of nonbiodegradable microplastics on soil respiration and enzyme activity: A meta-analysis
Plastics are widely used because of their low cost, excellent performance and portability. It is predicted that by 2050, approximately 12,000 million tons of plastic waste will accumulate in the environment. Plastic fragments in the environment can decompose into microplastics (MPs) with diameters < 5 mm. Once MPs enter the soil, they usually require hundreds or even thousan...Plastics are widely used because of their low cost, excellent performance and portability. It is predicted that by 2050, approximately 12,000 million tons of plastic waste will accumulate in the environment. Plastic fragments in the environment can decompose into microplastics (MPs) with diameters < 5 mm. Once MPs enter the soil, they usually require hundreds or even thousan...
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Main environmental drivers of abundance, diversity, and community structure of comammox Nitrospira in paddy soils
The complete ammonia oxidation process mediated by comammox Nitrospira is the key to one-step nitrification. As a special agricultural ecosystem, paddy field accounts for 30% of the total planting area of domestic crops. The periodic alternation of dry and wet forms a typical redox gradient, which is an ideal model for studying the key biogeochemical cycle processes of terre...
