Institutional Repository of Institute of Process Engineering, CAS (IPE-IR）
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Self-cleaning photocatalytic MXene composite membrane for synergistically enhanced water treatment: Oil/water separation and dyes removal
No full textMembrane separation has been widely used for water treatment, but the accumulation of pollutants on mem-brane surface is still inevitable during practical applications. Photocatalytic technology is an effective and environmentally friendly method for the degradation of pollutants. Here, we reported a simple method to prepare novel two-dimensional (2D) Bi2O2CO3@MXene photocatalytic composite membranes as well as their multi-functional abilities for water treatment. The experimental results exhibited that the composite membrane has ultrahigh water flux after incorporation of N-doped Bi2O2CO3 nanoparticles (815.3 L.m(-2).h(-1)). In addition, the rejection ratio for three different types of oil/water emulsions was all over 99 %, and excellent dyes removals were obtained by membrane separation, adsorption and photodegradation abilities, which were approximately 99.9 % (Congo red), 98 % (Trypan blue) and 98.4 % (Rhodamine B), respectively. Most importantly, the com-posite membrane maintained a stable permeability and selectivity after five consecutive cycles with visible light irradiation. Density functional theory (DFT) calculation and Finite Element Method (FEM) analysis were carried out to reveal the mechanisms for the improvement of photocatalytic activity and membrane permeability, respectively
Overall mechanism of JP-10 pyrolysis unraveled by large-scale reactive molecular dynamics simulation
No full textThis paper reports the overall reaction mechanism of JP-10 pyrolysis obtained in large-scale reactive molecular dynamics simulations employing the force field of ReaxFF CHO-2008. The C B4 > B2 > B5 > B1 > B6 > B7 that will not be significantly affected by temperature. The obtained aromatic hydrocarbons in simulations and the increasing C/H ratio with temperature and time during the three pyrolysis stages exhibit the coking tendency during JP-10 pyrolysis. (c) 2021 The Combustion Institute. Published by Elsevier Inc. All rights reserved
In situ reduction of cathode material by organics and anode graphite without additive to recycle spent electric vehicle LiMn2O4 batteries
No full textIn a conventional roasting-sorting process to obtain cathode powders, the phase structure of LiMn2O4 is not dissociated and the valence of manganese is not changed, resulting in low metal recovery efficiency and high reagent cost in the subsequent leaching process. In this context, a novel process is developed to realize the recovery of spent LiMn2O4 lithium-ion batteries (LIBs) via one-step pyrolysis and reductant-free acid leaching. The leaching efficiencies of lithium and manganese are respectively 99.9% and 99.4% under the optimal pyrolysis conditions: a temperature of 500 degrees C, a nitrogen flow rate of 50 mL/min, and a pyrolysis time of 60 min. The analysis of thermogravimetry-infrared spectroscopy indicates volatilization of electrolyte and decomposition of LiPF6 occur in the temperature range of 100-180 degrees C. When the temperature rises from 180 to 800 degrees C, high molecular weight polymers (binder and separator) are degraded into pyrolytic gas and oil. LiMn2O4 is deconstructed and reduced to MnO and Li2CO3 under the synergistic effect of pyrolytic gas and anode graphite. The harmful fluorine and phosphorus are absorbed by Ca(OH)2 solution to avoid environmental hazards. The results suggest that the process integrated pyrolysis and aicd leaching is efficient, environmental-friendly, and low-cost for recycling spent LiMn2O4 LIBs
Amplifying Free Radical Generation of AIE Photosensitizer with Small Singlet-Triplet Splitting for Hypoxia-Overcoming Photodynamic Therapy
No full textType-I photodynamic therapy (PDT) with less oxygen consumption shows great potential for overcoming the vicious hypoxia typically observed in solid tumors. However, the development of type-I PDT is hindered by insufficient radical generation and the ambiguous design strategy of type-I photosensitizers (PSs). Therefore, developing highly efficient type-I PSs and unveiling their structure-function relationship are still urgent and challenging. Herein, we develop two phenanthro[9,10-d]imidazole derivatives (AQPO and AQPI) with aggregation-induced emission (AIE) characteristics and boost their reactive oxygen species (ROS) generation efficiency by reducing singlet-triplet splitting (Delta E-ST). Both AQPO and AQPI show ultrasmall Delta E-ST values of 0.09 and 0.12 eV, respectively. By incorporating electron-rich anisole, the categories of generated ROS by AIE PSs are changed from type-II (singlet oxygen, O-1(2)) to type-I (superoxide anion radical, O-2(center dot-) and hydroxyl radical, center dot OH). We demonstrate that the assembled AQPO nanoparticles (NPs) achieve a 3.2- and 2.9-fold increase in the O-2(center dot-) and center dot OH generation efficiencies, respectively, compared to those of AQPI NPs (without anisole) in water, whereas the O-1(2) generation efficiency of AQPO NPs is lower (0.4-fold) than that of AQPI NPs. The small Delta E-ST and anisole group endow AQPO with an excellent capacity for type-I ROS generation. In vitro and in vivo experiments show that AQPO NPs achieve an excellent hypoxia-overcoming PDT effect by efficiently eliminating tumor cells upon white light irradiation with good biosafety
