The semiconductor, electroplating, metallurgy, and ceramic industries discharge high concentration fluoride containing wastewater, making fluoride pollution in natural water a global problem.Thus， Zn?Mg?Al LDO is a good adsorbent material. Under different reaction temperatures of n（Zn²⁺）/n（Mg²⁺）/n（Al³⁺）, Zn?Mg?Al LDH was synthesized by co?precipitation method, and Zn?Mg?Al?LDH was calcined at different temperatures to obtain Zn?Mg?Al?LDO. X?ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT?IR) and BET specific surface area testing methods were used to study the structure and properties of Zn?Mg?Al LDO. The adsorption experiment was conducted on 50 mL of NaF solution with an mass concentration of 20.0 mg/L to investigate the performance of Zn?Mg?Al LDO in adsorbing and removing fluoride ions. The results showed that the Zn?Mg?Al LDO prepared under the conditions of n（Zn²⁺）/n（Mg²⁺）/n（Al³⁺）=2∶1∶1, reaction temperature of 75 ℃, and calcination temperature of 400 ℃ exhibited the best adsorption and removal performance of fluoride ions, with an adsorption and removal rate of 85.39%. Zn?Mg?Al LDO has characteristic peaks of hydrotalcite, good crystal structure, and a layered structure. Zn?Mg?Al LDO is a mesoporous material with a specific surface area of 103.15 m²/g. In addition, the kinetics and adsorption mechanism of the adsorption process were also studied. The results indicate that the adsorption process follows the Langmuir adsorption isotherm and quasi second?order kinetic equation.

Layered double hydroxides (LDHs),also known as hydrotalcite,can be widely employed in water pollution treatment because of their special layered structures,high physicochemical stability,and electronic properties.The application of LDH composites as catalysts for photocatalysis has received increasing attention.Therefore,the preparation and modification of LDH photocatalysts were reviewed,and the removal effect of pollutants from wastewater exerted by different LDHs was emphatically introduced.In addition, the mechanism and research status of LDH photocatalysts were briefly described.Finally,the development trend of LDH photocatalysts was prospected to provide a reference for the subsequent application of LDHs in water pollution treatment.

Industrial wastewater is mainly composed of sewage and waste liquid produced in industrial production process, which has been characterized by its complex composition, wide variety, large difference and difficulty in treatment.The commonly used methods for preparation of hydrotalcite were reviewed, such as chitosan method, plasma method and agricultural waste method. Hydrotalcite materials in the adsorption process are mostly in powder, which is difficult to be recycled, and rarely used in industry applications. In view of the above problems, Fe ions can be introduced in hydrotalcite materials to generate magnetism, which is be beneficial to recovery. By developing cheaper synthetic materials, simple and fast preparation methods, stable physical and chemical properties of hydrotalcite materials, industrial applications could be achieved. The introduction of magnetic materials into hydrotalcite composites can help to recycle. With the in?depth study of hydrotalcite preparation technology, the prospect of dealing with toxic pollutants will be better.

The optimization of production and operation parameters of oil pipelines can effectively reduce operation energy consumption and improve the economic benefits of pipeline transportation. Aiming at the newly⁃built Qingha oil pipeline in the high and cold regions,the production energy optimization model was established with the constraints of the minimum energy consumption in production and operation,and the constraints of temperature constraints,pressure constraints,and oil pump operating characteristics constraints.In order to improve the solution efficiency,the hybrid PSO⁃Powell algorithm is used to solve the problem.The optimization results show that after optimization,the thermal energy loss is reduced by 38.3%,the pressure energy loss is increased by 90.3%,and the total energy loss is reduced by 26.3%.The energy saving effect is obvious.

Downhole oilwater separation technology can make production liquid divide into water and oil, reduce the surface water treatment and improve oil displacement efficiency. However, pressure difference between output layer and injection layer increases after implementation of this technology. When pressure difference is greater than threshold pressure gradient of interlayer, the interlayer fluid flows. In order to prevent the occurrence of interlayer channeling, numerical model of injectionproduction well is established according to actual formation parameters. After studying the injection and production technology of the same well, the range of cross flow and the upper limit of daily production of single well are obtained, and the limit chart of permeability, thickness and single well production is obtained. When daily production volume of single well is 70 m3 and interlayer permeability is 1×10-3 μm2, the lower limit of interlayer thickness is 2.3 m; When daily production volume of single well is 70 m3 and interlayer thickness is 3 m, the upper limit of interlayer permeability is 1.25×10-3 μm2. When the physical parameters of interlayer are changed, daily production volume of single well can be determined according to the plate, which can be used to guide the development of oilfield development plan.

Methanol colloids of the coordinated europium oxide were prepared by colloids precipitation method with ligands of thienyltrifluroacetone (TTA) and 1,10phenanthroline (phen). The effect of concentration of NaOH on fluorescent properties and structure of nanoparticles of the coordinated europium oxide were characterized by fluorescent spectra, UV spectra (UVVis) and high resolution transmission electron microscopy (HRTEM). The results show that the nano europium oxide particles coordinated by TTA and phen can irradiate intense red light under ultraviolet radiation, and their fluorescence spectra presents typical characteristic emission peaks of Eu ³⁺ ions. Different NaOH concentration has a great effect on the fluorescence intensity of nano europium oxide methanol colloids. The HRTEM and selected area electron diffraction (SED) results show that the core of the nanoparticles are europium oxide microcrystals with the size less than 10 nm. As this kind of the coordinated europium oxide colloid can emitted strong red fluorescence, it can be used as excellent luminescent materials in the future.