5 results about "Metal toxicity" patented technology

A biotoxicity prediction method based on SMOTE small sample machine learning can deal with the problem of insufficient natural experimental data, is proved to be capable of solving complex environmental problems, and comprises the steps of generating virtual data based on a synthetic minority class oversampling technology SMOTE to supplement sample data and maintain sample balance to meet the machine learning requirement; the method comprises the following steps: collecting natural water experimental data to obtain data related to metal toxicity prediction: water chemical condition data, nano-metal data and biological accumulation data; the data preprocessing is used for converting the data into a form suitable for being input into a machine learning model so as to improve the precision and efficiency of a fitting model; constructing a small sample machine learning model generated based on the virtual sample; model verification and feature importance analysis are carried out, the model verification comprises internal and external verification on the model so as to correctly evaluate the robustness and predictive ability of the model, and the feature importance analysis comprises feature importance sorting by adopting two standards of mean square error (MSE) increase and node purity increase.

This invention discloses a metal-free, highly sensitive, rapid fluorescent probe, its preparation method, and its application in the detection of pathogenic bacteria in food, belonging to the field of food detection technology. The probe consists of an organic fluorescent molecular graphene composite matrix, an organic-inorganic hybrid dopant, and a specific recognition molecule. The dopant is carboxylated cellulose and silica nanoparticles, with a mass ratio of 1:6~10 to the composite matrix. The specific recognition molecule is a pathogenic bacteria aptamer, grafted onto the probe surface via spray coating. The probe triggers a fluorescence response by the specific binding of the aptamer to the target pathogenic bacteria, completing detection within 5 minutes with a sensitivity ≥90% and a specificity ≥98%. The probe contains no metal components, posing no toxicity or environmental risk, and is suitable for rapid on-site food detection and live animal detection. Simultaneously, the preparation cost is reduced by 90%, and the cost per sample is reduced by 40%, demonstrating promising application prospects.

The invention provides application of ciliates in heavy metal toxicity detection and a heavy metal toxicity detection method, and relates to the technical field of heavy metal toxicity evaluation. Specifically, the invention provides application of the Nalklukella marrimilis as a detection organism in heavy metal toxicity detection. The research finds that compared with other marine organisms, the nanokallukella marrimilis has the advantages that the acute toxicity response time of the nanokallukella marrimilis to heavy metals is shorter, and the threshold value is more sensitive. Therefore, the nanokallukella margaritae can be used for detecting the toxicity of the heavy metals, a reference is provided for evaluating the toxicity effect of deep-sea organisms on the heavy metals, and a scientific basis is also provided for evaluating the marine pollution risk. The method is of great significance to environmental protection.

This invention belongs to the field of wastewater treatment technology, specifically relating to the application of poly(1,8-dihydroxynaphthalene) in the degradation of aniline. This invention provides an application of poly(1,8-dihydroxynaphthalene) in the degradation of aniline. The invention uses poly(1,8-dihydroxynaphthalene) as a catalyst in the degradation of aniline; the catalyst does not contain metal components, is low in cost, and has no metal toxicity. The poly(1,8-dihydroxynaphthalene) provided by this invention exhibits high removal efficiency for aniline.

The invention belongs to the technical field of photocatalytic degradation of antibiotics, and particularly relates to a pyrenyl covalent organic framework material as well as a preparation method and application thereof. According to the method, 1, 3, 6, 8-tetra (4-aminophenyl) pyrene and 2, 5-dihydroxy terephthalaldehyde are taken as raw materials and are synthesized through Schiff base condensation reaction in an anisole solvent and an acetic acid catalyst under the protection of nitrogen, and pyrenyl surface hydroxyl functionalization is realized. The pyrenyl covalent organic framework material has a pyrene ring and a hydroxyl functional group, is high in crystallinity, has the specific surface area of 1878m < 2 > / g and the band gap width of 1.90 eV, and can respond to visible light. Under a 300 W xenon lamp, the degradation rate of sulfadiazine with the concentration of 1 mg / L-10 mg / L within 90 minutes exceeds 99%, the degradation rate of sulfadiazine with the concentration of 15 mg / L reaches 82%, and the performance retention rate of sulfadiazine after 5 times of circulation exceeds 85%. The material is simple to prepare, has no metal toxicity, is suitable for treating organic pollutants in water, and provides a new choice for photocatalytic degradation of sulfadiazine.