In this paper,four zinc and cadmium transition metal-organic frameworks were synthesized by hydrothermal method,doped with ammonium metavanadate in the ratio of 2∶1 by mass,and calcined at 400 ℃,500 ℃ and 600 ℃ under the nitrogen flow rate of 200 mL/min to obtain four new metal-organic frameworks derived carbon materials.The structure of the prepared materials was characterized by XRD,SEM,and XPS and other testing methods,and their photocatalytic degradation effects on the organic dyes,such as methylene blue,rhodamine B,Congo red,crystalline violet,and methyl orange,were investigated by Ultraviolet degradation experiments.The experimental results showed that the vanadium-doped Cd-MOF derived carbon materials obtained by 500 ℃ calcination exhibited excellent photocatalytic degradation of crystalline violet solution,with a photocatalytic degradation rate of 99.27% after UV illumination for 240 min.

A novel Cd-MOF was synthesized and used as a fluorescence sensor for rapid,simple,and reliable fluorescence recognition and detection of nitroimidazole antibiotics in water.Fluorescence spectra investigation have shown that the complex exhibits high selectivity and sensitivity,excellent response ability,and low detection limit towards metronidazole(ODZ),metronidazole(DTZ),and metronidazole(MDZ)(2.66×10^-3μmol/L,1.465×10^-3μmol/L,2.66×10^-3μmol/L for ODZ,DTZ and MDZ,separately).The sensing mechanism of Cd-MOF was analyzed by UV absorption spectroscopy,and the experimental results showed that the fluorescence quenching of Cd-MOF by nitroimidazole antibiotics was attributed to the fluorescence internal filtration effect.The synthesized Cd-MOF has broad development prospects and is expected to achieve practical detection of nitroimidazole antibiotics in water.

Cetyltrimethylammonium bromide(CTAB)and polyethylene glycol(PEG),as well as CTAB and polyethylene glycol octylphenylmethylene(OP)were used as dual templating agents to induce the synthesis of MoVTeNbO composite metal oxide catalysts with mesoporous structure.The synthesized catalysts were applied to the selective oxidation of propylene to acrylic acid.The results show that when using the dual template agents CTAB and PEG,MoVTeNbO composite metal oxide can be induced to form a mesoporous structure with uniform pore size distribution concentrated at 4~10 nm and pore volume of 0.058 cm³/g under n（Mo）∶n（V）∶n（Te）∶n（Nb）∶n（PEG）∶n（CTAB）=1∶0.34∶0.22∶0.13∶0.056∶0.047.When CTAB and OP were used as dual template agents with different concentrations,mesoporous MoVTeNbO catalysts could also be induced to synthesize,in which, when n（Mo）∶n（V）∶n（Te）∶n（Nb）∶n（OP）∶n（CTAB）=1∶0.34∶0.22∶0.13∶0.011∶0.044,the pore size distribution was concentrated in the range of 7-14 nm with pore capacity of 0.132 cm3/g.The synthesized catalyst showed good catalytic activity in the oxidation of propylene to acrylic acid,the selectivity of acrylic acid could reach up to 82%.Compared with the catalyst prepared without CTAB and OP,the selectivity of acrylic acid was increased by at least 22.78%.

When untreated calcium arsenate slag is exposed to the natural environment,it can reacts with carbon dioxide and releases arsenate ions with different valence into the soil or river,and causes environmental pollution.In this study,cement solidification was used to solidify the calcium arsenate slag which provided by an enterprise in Yunnan.The cement solidification effect of calcium arsenate slag with different mass ratio was studied.By the compression test and toxicity leaching test,it is found that the toxicity leaching value of the solidified body is not more than 1 mg/L,which is lower than the national standard requirment of 1.2 mg/L.The compressive strength of the solidified body is more than 10 MPa,which meets the national requirements for safe landfill or accumulation of arsenic containing waste residue.

As a very important antioxidant enzyme in vivo,selenoenzyme plays a very important role in maintaining the metabolic balance of reactive oxygen species(ROS)and protecting body from oxidative stress.The artificial simulation of selenoenzyme especially the construction of environmental-responsive smart artificial enzymes can reveal the catalytic mechanism of nature enzyme and expand the potential applications in the development of antioxidant drugs.In this research,compound V was designed and synthesized.The new organic selenium compound contained both selenoenzyme catalytic center and two secondary amine groups.Two secondary amine groups were both protonated at pH=6.The compound V can assemble with cucurbit［6］uril(CB［6］)to form molecular machine.The active center was encapsulated in the hydrophobic cavity of CB［6］so that almost no catalytic activity can be shown［(2.1±0.06)×10^-5μmol·min-1·μmol^-1］.The protonation degree of two secondary amine groups had a significantly decrease at pH=8 which lead to the partly dissociation of molecular machine.The active center was exposed to solution at this time and the catalytic activity was (0.31±0.01)×10^-3μmol·min^-1·μmol^-1.Therefore,pH-responsive artificial selenoenzyme can be successfully constructed by the association and dissociation of molecular machine through the changing the pH between 6 and 8 in order to control the recombination and partial dissociation of molecular machines.

To evaluate the dust explosion risk in oil shale retorting process more comprehensively,a comprehensive risk assessment method for dust explosion in oil shale retorting process was proposed combining G1 method,entropy weight method,game theory and cloud model theory.The  method uses G1 method and entropy weight method to determine the subjective and objective weight of evaluation index,and then calculates the comprehensive weight value by game theory method,and combines cloud model to determine the risk level of dust explosion.Based on the explosive characteristics of materials,the dust explosion risk assessment system of oil shale retorting process was established from four aspects of human,material,environment and management.The typical risk factors were classified into four categories and 30 items.Taking the Fushun style oil shale dry distillation refining process as an example for analysis,the numerical characteristics of the cloud model were (6054,322,079),and the explosion risk was moderate.The effectiveness of the model was verified by comparing it with analytic hierarchy process-fuzzy comprehensive evaluation,analytic hierarchy process - entropy weight method combined weight - extension model and variable fuzzy set pairing method.The research results show that the dust explosion risk assessment system and evaluation method of oil shale retorting process have strong pertinence and operability and the evaluation results are intuitive,which can provide reference for the study of dust explosion risk in oil shale retorting process.

In order to prevent the occurrence of accidents in fine chemical industrial park,a multi-level hierarchical structure model of the influencing factors of vulnerability in fine chemical industrial park was proposed.Firstly,the index system of influencing factors of vulnerability is constructed from five aspects:personnel,facilities,materials,environment and management.Secondly,the decision laboratory analysis method was used to determine the correlation influence matrix,calculate the influence degree values among the vulnerability influencing factors,and analyze the complex internal relationship and accident path propagation.A multi-level hierarchical interpretive structural model based on DEMATEL-ISM was established.The results show that the professional skills of personnel,safety protection of equipment and storage of materials have direct influence on the vulnerability of the park.The implementation of laws and regulations and safety management system is the fundamental factor of vulnerability of the park,which provides reference for preventing accidents in fine chemical park from the root.

The snowman-like Janus particles with strict partition were synthesized by seed swelling emulsion polymerization induced phase separation.The two side partition structures were continuously modified,and the amphiphilic snowman-like Janus particles with magnetic were prepared.One side of the particle has hydrophilic imidazole group(—Im),and the other side of the particle has a long chain of hydrophobic alkyl(—C18),which has a strong loading capacity of the oil phase for separation of oil and water.Meanwhile,the particles have paramagnetic responsiveness.The particles can stabilize at the oil-water interface and control the move of emulsified droplets under magnetic field for separation of oil and water.The particles can be recycled which is conform to the requirements of green chemistry.The method for preparing functional Janus particles is universal,and a series of Janus particles with different compositions and functions can be obtained through different modifications on both sides,which provides a new idea for the preparation of advanced functional polymer materials.

In order to obtain iron-based surfacing alloy with high hardness,various Fe-Cr-Ti-C alloy powders with different Cr content were designed and developed,and the corresponding surfacing layers were prepared on carbon steel substrate by plasma surfacing technology.The microstructure,phase composition and microhardness of Fe-Cr-Ti-C alloy with different Cr mass fraction were analyzed by X-ray diffraction,scanning electron microscope and microhardness tester.The results show that the surfacing layer of Fe-Cr-Ti-C alloy consists of austenite(γ),martensite(M),M₇C₃ and TiC.With the increase of Cr content,the number of martensite matrix structures in the surfacing layer first increases and then decreases,and the number of M₇C₃ gradually increases.The morphology changes from intermittent network to primary hexagon,and TiC is flowered or blocky.The microhardness on the side of the surfacing layer presents a gradient distribution.With the increase of Cr mass fraction,the hardness of the surfacing layer increases continuously.When the Cr mass fraction is 15.0%,it is the best value,and the average microhardness on the top of the alloy surfacing layer is the highest,reaching HV_0.21 186.

To explore the smelting process of condensing submerged arc furnace,a three-dimensional electric-magnetic-thermal-mechanical coupling simulation model of condensing submerged arc furnace is established in this paper.The coupling mechanism between multiple physical fields in a condensing submerged arc furnace is numerically simulated.In addition,the influence of different electrode insertion depths on the furnace temperature,stress and strain is analyzed.The results show that the current in the furnace flows in and out in four paths.The magnetic induction intensity around the arc is larger,and the maximum value is distributed at the edge of the arc.The maximum joule heat value is distributed around the arc area As the electrode insertion depth increases from 1.8 m to 2.2 m,the temperature of the magnesia brick at the furnace bottom gradually increases,and the stress and strain of the furnace body also increase accordingly.The circumferential tensile stress on the outer surface of the furnace shell is greater than the axial tensile stress.

To solve the problem of fault detection in multimodal industrial process date with significant variance difference,a Feature Space Reconfiguration of Locality Preserving Projections(FSR-LPP)fault detection strategy.Firstly,the dimensionality reduction of process data is carried out by using LPP,which removes the redundant information and noise of the data,and the computational complexity is reduced.Then,applying a Variational Gaussian Mixture Model(VBGMM)to unlabeled process data,determine the number of operation modes,and cluster the data in each mode,secondly,the data in each mode is standardized using the information of the mode to remove the multimodal data features,finally,using statistics to monitor the process.The effectiveness of the proposed method was verified through a multimodal numerical example and semiconductor etching process.