Methylene blue was degraded by adopting a heterogeneous Fenton system composed of manganese residue and H₂O₂, and the effects of initial pH value, H₂O₂ concentration, dosage of manganese residue and reaction temperature on the degradation performance were studied. The reusability of manganese residue was investigated, and the removal mechanism of methylene blue in the manganese residue/H₂O₂ system was also discussed. The results show that the removal rate of methylene blue can exceed 98.1% after 120 min reaction at temperature of 25 ℃, with methylene blue concentration of 20 mg/L, H₂O₂ concentration of 10 mmol/L, manganese residue dosage of 2 g/L, and initial pH value of 2.5. After the manganese residue is recycled for 5 times, the removal rate of methylene blue can be still up to 95.5% by 300 min reaction. In the manganese residue/H₂O₂ heterogeneous Fenton system, ·OH plays a leading role in the degradation of methylene blue.

MIL-53(Fe), a metal-organic framework (MOF) material, prepared by using solvothermal synthesis was adopted to adsorb Sb(Ⅲ) in soil. MIL-53(Fe) was used as the adsorbent to adsorb the Sb(Ⅲ) in aqueous solution, and the effects of solution temperature, pH value, adsorbent dosage, initial concentration of Sb(Ⅲ), and humic acid content on adsorption performance were explored. Then, the isotherms and kinetics of adsorption were also analyzed. After 15 d remediation with the adsorbent at an amount of 3%, the TCLP testing shows that the concentration of leachable Sb(Ⅲ) decreases by 94.2%. However, the pH value and humic acid content of the solution have little effect on the adsorption performance. For 25 mL solution with concentration of Sb(Ⅲ) at 10 μg/mL, addition of 20 mg MIL-53(Fe) can bring good adsorption effect. The initial concentration of Sb(Ⅲ) has a significant impact on the adsorption of Sb(Ⅲ) by MIL-53(Fe). At equilibrium, the maximum adsorption capacity of the adsorbent is 102.9 mg/g. The adsorption isotherm of this process fits with the Freundlich model, and its adsorption kinetics can be described using pseudo-second order model.

With micron silicon powder as matrix, phosphorus-doped silicon-carbon composite material (Si-P@C) was synthesized by solid-state thermal diffusion and high-temperature pyrolysis, and then used as anode material of lithium-ion batteries. The results show that Si-P@C anode material demonstrates an initial discharge specific capacity up to 2164 mAh/g at a current density of 0.2 A/g. Compared with pure silicon, Si-P@C anode material presents greatly improved cycling performance. After 50 cycles at a current density of 0.5 A/g, it demonstrates a high reversible specific capacity of 1 176 mAh/g, with the capacity retention ratio of 73.5%. It is concluded that phosphorus-doping and carbon coating can effectively improve the electron transfer ability and reaction kinetics of silicon anode.

Aluminum sulfate, sodium hydroxide, and high-aluminum pickling sludge were used as raw materials to prepare pseudo-boehmite by adopting a dual aluminum source method. The effects of pH value, reaction temperature, and urea addition on the formation and structure of pseudo-boehmite, as well as the effects of synthesis conditions on the phase and structural properties of pseudo-boehmite were investigated. The results show that as the reaction temperature increases, the specific surface area and pore volume of pseudo-boehmite increase, and the crystallinity also increases. With pH value between 6.5 and 9.5, a clear pseudo-boehmite phase can be obtained; with pH value up to 10.5, a trihydrate alumina phase will be formed. The addition of urea can significantly increase the specific surface area and pore size of pseudo-boehmite.

To solve the problem of structural instability of cathode material (LiNi_0.8Co_0.1Mn_0.1O₂)(NCM)) during cycling, a strategy of co-doping of Rb⁺ and Cl^- was proposed for NCM materials. The synergistic effect of co-doping of Rb⁺ and Cl^- in the NCM lattice can increase the diffusion rate of Li⁺ and relieve the internal strain, thus hindering the mixing of Li⁺/Ni²⁺ during high cut-off voltage cycling. Electrochemical test results show that Li_0.99Rb_0.01(Ni_0.8Co_0.1Mn_0.1) O_1.99Cl_0.01 (RbCl-NCM) has a discharge capacity up to 176.9 mAh/g at a current density of 10C. The initial discharge capacity at 1C is 203.5 mAh/g. After 200 cycles, its capacity retention ratio is as high as 87.8%, showing an excellent cycling performance, while the capacity retention ratio of NCM material is only 57.3%.

To solve the problem of unstable slurry, low density of sintered body, and high carbon residue, the effect of different resin monomer on additive manufacturing of 5052 aluminum alloy with light curing strategy was explored. It is found that different type of monomer can bring great impact to the process of additive manufacturing with light curing strategy and the properties of the following sintered product. When the aluminum slurry prepared with TMPTA or PEG400DA has viscosity higher than 30 Pa·s and settling time is more than 120 h, the formed aluminum alloy substrate has a complete structure with more pores on the surface. When the aluminum slurry prepared with PEG200DA or HDDA has viscosity less than 30 Pa·s and the settling time is less than 16 h, the formed aluminum alloy substrate has no pores on the surface, but is prone to have incomplete structure. When the aluminum slurry prepared with PS-PCL has viscosity less than 30 Pa·s, and is stable and not prone to settling, the formed substrate has a complete structure with no pores on the surface. When the aluminum slurry with solid content around 55% was prepared with PS-PCL, after additive manufacturing process and sintering, the obtained sintered product has the relative density higher than 95%, relativly lower carbon residue (0.259 17%) and relatively higher hardness (29.94HV), with obvious necking growth on the fracture.

The comprehensive recycling ways for tailings after vanadium extraction, including recovery of valuable components, synthesis of new functional materials and preparation of multi-purpose building materials, were explained, which can provide a reference for application of technologies in comprehensive recycling of tailings after vanadium extraction.

Aiming at low intelligence in nickel plate surface defect detection, a detection method based on improved YOLOv5 was proposed. Firstly, the image-enhanced dataset of nickel plate was re-clustered by K-means++ to improve the adaptability of the anchor frame to the dataset. Secondly, the convolutional block attention module (CBAM) was added into the Backbone network to strengthen the feature recognition of interest areas and unclear targets by integration of spatial and channel information. Finally, an efficient IoU (EIoU) loss was introduced to replace the original CIoU loss during bounding box regression to effectively improve the convergence speed of regression, thereby increasing the model detection speed. The experimental results show that with the self-established dataset of nickel plate defect, the improved model, compared to Faster R-CNN, SSD, YOLOv3 and YOLOv5, has higher detection accuracy up to 81.4% on average, with detection speed reaching 61 frames per second. It is concluded that this model can not only improve detection accuracy, but also satisfy the requirements for detection speed.

Effects of electrochemical deposition time on the phase, morphology, bioactivity of hydroxyapatite (HA) coating and the bonding strength with the substrate were investigated adopting alkali-treatment of titanium alloy followed by electrochemical deposition. Results show that the electrochemically deposited coatings prepared on the surface of alkali-treated titanium alloy are composed of flake HA phases, and the electrochemical deposition time has no effect on the phase composition of the coatings, but will bring impact to the coating thickness. After 60 min deposition, the obtained HA coatings is very compacted and has the bonding strength with the substrate up to 17.85 MPa. It is shown that the HA coatings obtained after each deposition time have good bioactivity. In the simulated body fluids (SBF), CO₃^2- substitutes PO₄^3- in the HA into apatite to form steamed bun-shaped carbonated hydroxyapatite（CHA），with the diameter of 7-8 μm. After being immersed in SBF for 3 days，the CHA can be spread all over the surface of HA.

Mg-1%Al alloy plates were rolled at different strain rates, and the effects of rolling strain rate on microstructure, mechanical properties and damping properties of Mg-1%Al alloy were investigated. As rolling strain rate increases, the average grain size and recrystallization volume fraction of Mg-1%Al alloy increase, while the tensile strength, yield strength and texture strength decrease. As the rolling strain rate increases, the elongation decreases after an initial increase, reaching the highest (25.33%) at a strain rate of 20 s^-1, and the damping performance at room temperature is also improved. The damping value is 0.061 with the strain amplitude of 0.1% at a strain rate of 30 s^-1, which is 1.5 times of that at a strain rate of 15 s^-1. At a certain strain rate, the damping performance decreases as strain frequency increases.