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Abstract: MG-Al hydrotalcite (MgAl-LDH) was prepared by hydrothermal method, and MgAl-LDH was modified with bismuth oxycarbonate (Bi2O2CO3) in order to obtain Bi2O2CO3/MgAl-LDH composite photocatalytic material. The composition, morphology and band gap of the prepared samples were characterized by XRD, SEM and UV-VIS diffuse reflection. The degradation ability of Bi2O2CO3/MgAl-LDH composite photocatalytic material was tested by degradation methylene blue solution (MB) under natural light. Results: When the modification amount of Bi2O2CO3 was 10%, the photocatalytic performance of the complex was the best, and the degradation rate of MB was as high as 92% in 2 h under natural light (tungsten halogen lamp). The quenching experiments showed that the main active species involved in the degradation of MB were superoxide free radicals (•O2-). Cyclic tests show that the composite photocatalyst still has a certain photocatalytic degradation ability after 5 cycles. Finally, the charge transfer process and mechanism of Bi2O2CO3/MgAl-LDH were investigated by using the experimental data and characterization results.Abstract: MG-Al hydrotalcite (MgAl-LDH) was prepared by hydrothermal method, and MgAl-LDH was modified with bismuth oxycarbonate (Bi2O2CO3) in order to obtain Bi2O2CO3/MgAl-LDH composite photocatalytic material. The composition, morphology and band gap of the prepared samples were characterized by XRD, SEM and UV-VIS diffuse reflection. The degradation abili...Learn More
Abstract: The vacuum filter is a crucial equipment for the flash evaporation system of GE coal water slurry gasification process, and the subsequent sequence is crucial! By utilizing vacuum negative pressure filtration process, solid-liquid separation of high concentration filtrate after flocculation and sedimentation is achieved. The production operation process includes filtration, washing, slag unloading, and filter cloth cleaning. Focus on the common problems that have occurred after the vacuum filter machine was put into normal production and operation. Analyze the reasons one by one, propose targeted disposal and optimization measures, and achieve continuous operation and filtration of the suction filter. This article mainly focuses on the common problems that have occurred in the past operation process, such as water carrying in the filter cake, deviation of the filter cloth, insufficient vacuum degree, unclean filter cloth falling out of the funnel, and slipping of the tape. Corresponding solutions and innovative transformation measures are proposed. The operation of the vacuum filter is directly related to the changes in water quality of the coal water slurry gasification unit and the impact of long-term continuous operation. During the production process, common problems that cannot be identified and dealt with in a timely manner may cause significant fluctuations in operating conditions.Abstract: The vacuum filter is a crucial equipment for the flash evaporation system of GE coal water slurry gasification process, and the subsequent sequence is crucial! By utilizing vacuum negative pressure filtration process, solid-liquid separation of high concentration filtrate after flocculation and sedimentation is achieved. The production operation pr...Learn More
Abstract: With the acceleration of industrialization and the development of the global economy, CO2 emissions continue to increase, leading to higher greenhouse gas concentrations and a growing climate change problem. In order to accomplish the requirements of carbon emission targets under the dual-carbon goal, the conversion of CO2 into valuable chemicals is of great significance in achieving the carbon cycle. And CO2 electrochemical reduction for the preparation of chemical fuels is one of the most promising methods for the preparation of chemical fuels with the advantages of easy operation and green color. In recent years, CO2 electrochemical reduction reaction (CO2RR) has a broad prospect for green energy conversion and storage. CO2RR is a technology that applies electrochemical methods to the electrochemical reduction of CO2 capture. In the CO2RR process, the design of the electrolytic cell is crucial because it directly affects the efficiency, selectivity and stability of the reaction. In this paper, three types of electrolytic cells commonly used for CO2RR were firstly introduced, and the advantages and disadvantages of different types of CO2 electrolytic cells were discussed, followed by analyzing the main factors affecting CO2RR in terms of both catalysts and electrolytes. Finally, a new alternative to the traditional amine-based CO2 capture method and the current research status were introduced, and the future research direction and application prospect of CO2RR process were proposed.Abstract: With the acceleration of industrialization and the development of the global economy, CO2 emissions continue to increase, leading to higher greenhouse gas concentrations and a growing climate change problem. In order to accomplish the requirements of carbon emission targets under the dual-carbon goal, the conversion of CO2 into valuable chemicals i...Learn More
