In this work, the rutile mesocrystals TiO₂ were synthesized by hydrothermal method using layered titanate HTO (H_4x/3Ti_2-x/3□ _x/3O₄?nH₂O) as the precursor. By means of X?ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and other testing methods, the effect of reaction temperature on the synthesis of rutile?type mesoscopic TiO₂ crystal material by means of topological structure transformation was studied. The results reveal that rutile TiO₂ can be obtained under the condition of pH 0.5 of the reaction system, and with the gradual increase of the reaction temperature, the rutile?type mesoscopic TiO₂ crystal material is formed at 120 ℃. Taking Rhodamine B (RhB) as the pollutant model for degradation experiments, the photocatalytic activity of rutile mesocrystals TiO₂ is significantly higher than that of other samples. Experiments on dye?sensitized solar cells (DSSCs) show that the mesocrystals structure formed at 120 ℃ is conducive to the rapid migration of photogenerated carriers, thus obtaining high cell characteristics.

β?cyclodextrin polymers modified with Fe₃O₄ (β?CDP@Fe₃O₄) was synthesized in alkaline medium using β?cyclodextrin (β?CD) as monomer and epichlorohydrin as crosslinker. The adsorption performances of β?CDP@Fe₃O₄ on bisphenol A (BPA) under static and dynamic conditions were investigated. The results of static experiment show that the adsorption performance of 100 mg/L BPA (pH=5.6) is best at 0.10 g β?CDP@Fe₃O₄. At this point, the equilibrium adsorption capacity, adsorption rate and the maximum adsorption capacity are 45.600 mg/g, 91.3%, and 113.600 mg/g, respectively. The results of dynamic experiment show that the smaller the liquid hourly space velocity, the higher the adsorbent utilization rate, and with the increase of BPA concentration, the adsorption breakthrough time and saturation time are declined. At the same time, the synthesis and adsorption mechanism of β?CDP@Fe₃O₄ were discussed. A rapid adsorption rate for the removal of BPA onto β?CDP@Fe₃O₄ from water solution was achieved, and the adsorption process was mainly due to hydrogen bond and hydrophobic interaction. β?CDP@Fe₃O₄ has good regenerative performance, through 6 cycles of static adsorption?desorption, and 3 cycles of dynamic adsorption?desorption without significant changes in adsorption performance.

Ferric nitrate was used to provide iron source, and Fe?C₃N₄ composite material was prepared by impregnation method. FT?IR was used to characterize and analyze the prepared materials. The results show that Fe doping does not change the skeleton structure of g?C₃N₄ and can increase the photocatalytic performance of g?C₃N₄ materials. Taking orange II as the target pollutant, Fe?C₃N₄ catalyzed the activation of persulfate to degrade azo dyes under visible light. The effects of persulfate dosage, Fe?C₃N₄ dosage, pollutant concentration and pH conditions on the degradation effect were examined, and the reaction kinetics was studied to analyze the stability of the prepared catalytic materials. The results show that when the Fe?C₃N₄ concentration is 2.0 g/L, the molar ratio of persulfate to pollutants is 1 200∶1, and pH=3, the degradation effect is best, and the degradation rate is 77.8%; Fe?C₃N₄/persulfate system is dual the degradation of nitrogen dyes satisfies the quasi?second?order kinetic equation; Fe?C₃N₄ material is reusable.

OA?ZnCl₂/SG supported catalyst was synthesized by sol?gel process using octanoic acid?zinc chloride deep eutectic solvents (OA?ZnCl₂ DESs) as additive. The structure of the catalyst was analyzed by infrared spectroscopy, X?ray diffraction, N₂ adsorption?desorption and scanning electron microscopy. The performance of oxidative desulfurization was studied by using OA?ZnCl₂/SG as adsorbent and catalyst, and hydrogen peroxide as oxidant. The loading dose of DESs, reaction temperature, n(H₂O₂)/n(S) ratio, the amount of catalyst and the effect of different sulfides on desulfurization rate were investigated. The results show that the desulfurization rate of the catalyst reaches 95.6% under the optimal conditions, and after 5 cycles, the desulfurization rate drops to 89.7%.

Using sludge from municipal sewage treatment plants as raw materials, sodium bicarbonate as green activator, and ammonium phosphate as nitrogen and phosphorus source, modified sludge biochar was prepared by vacuum pyrolysis. SEM and FT?IR were used to characterize and analyze the materials. The results show that the modified sludge biochar can significantly increase the specific surface area and porosity of the biochar, as well as the number of N-H and C-O. By changing the dosage of modified sludge biochar, pollutant mass concentration, reaction temperature and pH value and other conditions, the effect of modified sludge biochar on phenol adsorption was studied, and the adsorption process and mechanism were studied. The results show that the modified sludge biochar has a better adsorption effect on phenols, and the adsorption rate increases with the increase in the dosage of sludge biochar; when the pollutant mass concentration increases, the adsorption rate decreases; the higher the temperature, the better the adsorption effect; the acidic conditions are more suitable for the reaction. The adsorption process of modified sludge biochar for phenols conforms to quasi?second?order kinetics, and the adsorption mechanisms are monolayer adsorption and uneven surface adsorption. Modified sludge biochar has good recyclability and it can provide an effective way for the resource utilization of sludge and the treatment of phenols in wastewater.

The influence of electromagnetic parameters (the distance between upper and lower poles and the coil current intensity) on the flow field in the mold and the volatile behavior of steel/slag interface was studied by numerical simulation. The results show that the magnetic induction intensity in the covered area of the upper magnetic pole and the lower magnetic pole in the full?amplitude two?stage electromagnetic brake crystallizer affects each other. The increase of the current intensity in the coil of the upper (or lower) magnetic pole will lead to the increase of the magnetic induction intensity in the covered area of the corresponding lower magnetic pole (upper magnetic pole). The full amplitude two?stage electromagnetic brake can significantly restrain the flow velocity of molten steel and stabilize the fluctuation of meniscus in the mold. As the distance between upper and lower magnetic poles increases, the impact intensity of molten steel jet on the narrow surface of the mold increases, and the turbulent kinetic energy and velocity of molten steel at the steel/slag interface increase. With the increase of the current intensity of the upper magnetic pole coil, the impact intensity of liquid steel jet on the narrow surface of the mold is basically unchanged, and the flow velocity and turbulent kinetic energy of liquid steel at the steel/slag interface decrease. As the current intensity of the lower pole coil increases, the impact intensity of liquid steel jet on the narrow surface of the mold decreases slightly, and the flow velocity and turbulent kinetic energy at the steel/slag interface decrease.

Petroleum resin wastewater sludge is classified as hazardous waste. The method of sludge recycling was introduced through the analysis of the main components of sludge, and the adsorption conditions and effects of phosphorus were studied. The results show that the main components of petroleum resin wastewater sludge are petroleum pollutants such as benzene, naphthalene, indene, azulene, olefins, alkanes and so on . After calcined at 600 ℃, the weight reduction of sludge was 82.5%, and an adsorption material based on γ?Al₂O₃ was obtained. The optimal adsorption conditions of calcined sludge for phosphorus: Adsorption time is 90 min, oscillation intensity is 180 r/min, pH=4, initial phosphorus concentration is 12.5 mg/L and dosage of sludge is 2.0 g. The optimal adsorption removal rate of phosphorus is 93.8%, and the adsorption removal rate after circulation is 87.0%. Therefore, after the calcination treatment of petroleum resin wastewater sludge, the reduction and recycling of hazardous waste can be successfully achieved.

In order to study the salt precipitation law of the NaCl?Na₂SO₄?H₂O ternary system at a temperature of 298.15 K, the Pitzer model was used to predict and calculate the activity coefficient and solubility of the system, and the variation of the activity coefficients of Na⁺, Cl^- and SO {}_{\mathrm{4}}^{\mathrm{2}-} and the corresponding phase diagram of the ternary system were analyzed. The results show that with the increase of the Na₂SO₄ mass fraction, the activity coefficients of Cl^- and SO {}_{\mathrm{4}}^{\mathrm{2}-} have no obvious change, while the activity coefficient of Na⁺ icreases first and then decreases. When the mass fraction of Na₂SO₄ in the liquid phase is less than 6.8%, the average change rate of the increase in the activity coefficient of Na⁺ is 4.4%. When the mass fraction of Na₂SO₄ in the liquid phase is between 6.8% and 14.9%, the average change rate of decrease in the activity coefficient of Na⁺ is 4.1%, when the mass fraction of Na₂SO₄ in the liquid phase reaches 14.9%, the activity coefficient of Na⁺ decreases fastest, and the average change rate is 8.0%; when the mass fraction of NaCl in the liquid phase is greater than 22.9% and the mass fraction of Na₂SO₄ is less than 6.8% ,as the water evaporates, NaCl precipitates first and Na₂SO₄ precipitates later; when the liquid phase mass fraction of NaCl is 14.0%～22.9% and the mass fraction of Na₂SO₄ is 6.8%～14.9%, the precipitation order is reversed.

In solvent⁃free condition, a new 1D chain holmium phosphite Ho(H2PO3)4(C6N2H16)0.5 (compound 1) decorated by phosphite groups has been synthesized using N,N'⁃Dimethylpiperazine (Me2ppz) as structure directing agent, and further been characterized by powder XRD, infrared spectroscopy, thermogravimetric, inductively coupled plasma and CHN elemental analyses. Single crystal X⁃ray diffraction analysis reveals that compound 1 crystallizes in the monoclinic crystal system with the P21/c space group. The structure of compound 1 is constructed by HoO6 octahedra and [H2PO3]- pseudo⁃pyramids units via vertex oxygen atoms. It is worth noting that compound 1 is the first rare earth phosphite compound which is synthesized in solvent⁃free condition. Moreover, a pair of left⁃ and righ⁃handed helical chains are present in the structure. In addition, coordination mode and geometry of lanthanide phosphonate, phosphate and phosphite are listed in this paper.

Phosphate is an important multifunctional crystal material with broad application prospects in catalysis, photoluminescence, gas storage and separation. In recent years, many phosphate compounds and their derivatives have been used in the study of proton conducting materials. In this paper, the mechanism of proton conduction is briefly introduced. From the operating temperature, the phosphate is divided into two categories with 100 ℃ as the demarcation point. The research progress of phosphate as proton conducting material is introduced, and the challenges faced by phosphate as proton conduction material are prospected.

In view of the increasingly serious problem of corrosion and perforation of the oil pipe caused by water source well in the SZ36-1 oilfield, the corrosion law of the pipe is studied under field conditions and the corrosion is predicted. The Orthogonal experiment of five factors and four levels is designed to analyze the effects of temperature, pressure, flow rate, CO ₂ concentration and salinity on the corrosion rate.The main controlling factors in the corrosion environment of the water source well of SZ36-1 oilfield are temperature and CO ₂ concentration. The corrosion prediction model is established and compared by multiple linear regression analysis and BP neural network. The comparative analysis results show that the corrosion prediction model based on multiple linear regression method has higher prediction accuracy and is more suitable for corrosion prediction of oilfield water source well.

Hydrogen as a clean fuel will play a critical role in the future energy landscape. The hydrogen production reaction of electrolytic water only produces hydrogen and oxygen, which has the advantages of low cost, high efficiency, environmental friendliness and good safety. The oxygen evolution reaction is a key ratecontrolled reaction step in hydrogen production from electrolytic water. A simple Pt loaded Li ₂Co ₂O ₄ synthesis method was introduced and its oxygen evolution performance was characterized. The effects of different Pt loading (mass fraction) on the electrocatalytic performance were compared, and the optimum Pt loading was obtained when the Pt loading was 5%. The structure of the material was characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that a highly efficient catalyst capable of reducing the Pt consumption while maintaining the activity and durability of the catalyst is obtained.

A numerical study was conducted for the research of the fiber coalescence separation flow field.The results show that the pressure field of the fiber coalescence separator shows a slowly decreasing distribution from front to back. The pressure decreases with the increase of thickness. The coalescence pressure drop increases linearly with the increase of flow velocity and thickness. With the increase of porosity, the velocity distribution of the fiber coalescence separator is symmetrical. When the fluid flows into the fiber layer, The maximum velocity occurs in the fiber gap. The distribution of velocity in the fiber gap presents a “M” shape.

Based on the measured oil station coordinate data and longdistance oil pipeline paper topographic map vector data,using ArcGIS combination of Sketchup modeling to realize 3D visualization,storaging graphics and attribute data in Geodatabase,using C# programming language combine of ArcGIS Engine secondary development component , 3D oil station and longdistance oil pipeline information system were designed. The system realized the functions including 2D and 3D Linkage showes,information inquiry,spatial analysis,information output,system maintenance,etc.