Institutional Repository of Institute of Process Engineering, CAS (IPE-IR）
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Science and Technology Research Program of Chongqing Municipal Education Commission[KJQN201901326]
No full textHeterogeneous Hollow Multi-Shelled Structures with Amorphous-Crystalline Outer-Shells for Sequentially Photoreduction of CO2
No full textConstructing delicate nano-/microreactors with tandem active sites in hierarchical architectures is a promising strategy for designing photocatalysts to realize the challenging but attractive CO2 reduction. Herein, hollow multi-shelled structure (HoMS) based microreactors with spatial ordered hetero-shells are fabricated, which achieve two-step CO2-to-CH4 photoreduction. The multiple inner CeO2 shells increase the number of active catalytic sites to ensure efficient first-step reaction for generating CO, along with enriching the local CO concentration. The second-step CO-to-CH4 reaction is consequently induced by amorphous TiO2 (A-TiO2) composites on the adjacent outer-most shell, thus realizing the CO2-to-CH4 conversion capability using one CeO2@CeO2/A-TiO2 HoMS. In-depth explorations in the microreactors provide compositional, structural, and interfacial guidance for engineering HoMS-based microreactors with temporally-spatially ordered shells toward efficient tandem catalysis
Recovery of Vanadium, Titanium, and Iron from Vanadium Titanomagnetite Concentrate Through Ammonium Sulfate Cascade Roasting with Potassium Pyrosulfate
No full textIn this study, an efficient utilization of vanadium titanomagnetite concentrate was systemically investigated through potassium pyrosulfate (K2S2O7) synergized with ammonium sulfate ((NH4)(2)SO4) cascade roasting to separate and recover vanadium, iron, and titanium. The result shows that 95.87% of vanadium and 80.13% of iron could be extracted, while that of titanium was only 9.68% under the condition of first-order temperature and time 240 degrees C and 3 h, second-order temperature and time 410 degrees C and 2 h, and the mass ratio of K2S2O7, (NH4)(2)SO4 and PVBT 0.1:4:1. Phase transformation and thermodynamic analysis reveals that the valuable metals could be converted into corresponding sulfates in situ. XRD and SEM-EDS show that the addition of K2S2O7 strongly promoted the formation of liquid phase and soluble potassium vanadate. A high-titanium slag with 85.32% titanium was obtained by the iron powder induction leaching and alkali leaching. Additionally, the additive (NH4)(2)SO4 could be recycled, achieving zero emission of waste gas.
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Ultrahigh Capacity and Rapid Selective Recycling of Gold Ions by Organic Intercalated and Exfoliated Few-Layer Ti3C2TX Nanosheets
No full textFor the sustainable development of the ecological environment in gold recycling, it is urgently desired to develop a more efficient and highly selective process for gold ions from e waste or mineral lixivium. As a kind of emerging two-dimensional nanomaterials, Ti3C2Tx has emerged as a rapidly developing novel water treatment material. Herein, the preparation of few-layer Ti3C2Tx nanosheets and their performance for recycling of gold ions were studied. Notably, it exhibits an impressive capacity of 2973.57 mg/g at room temperature, almost 124 times that of commercially available activated carbon (24 mg/g), and an exciting selectivity for Au(III) in the presence of competing ions due to perfectly weak reduction caused by the removal of the Al layer. The Langmuir isotherm and pseudo-second-order kinetic model can accurately depict the rapid adsorption process. Additionally, it can be regenerated effectively by thiourea and exhibits excellent reutilization. A critical mechanism involves an adsorptive-reduction pathway between Au(III) and active Ti sites. Excellent performance in real lixiviums from e-waste and gold-bearing sludge is also exhibited, demonstrating great potential for Au(III) recycling. It may be a sustainable direction for the capture and separation of Au(III) and also lays the foundation for the interface control of Ti3C2Tx and Au NPs as a catalyst and other functional materials