Institutional Repository of GuangZhou Institute of Energy Conversion, CAS
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Recent advances in swine wastewater treatment technologies for resource recovery: A comprehensive review
No full textSwine wastewater (SW), characterized by highly complex organic and nutrient substances, poses serious impacts on aquatic environment and public health. Furthermore, SW harbors valuable resources that possess substantial economic potential. As such, SW treatment technologies place increased emphasis on resource recycling, while progressively advancing towards energy saving, sustainability, and circular economy principles. This review comprehensively encapsulates the state -of -the -art knowledge for treating SW, including conventional (i.e., constructed wetlands, air stripping and aerobic system) and resource-utilization-based (i.e., anaerobic digestion, membrane separation, anaerobic ammonium oxidation, microbial fuel cells, and microalgal-based system) technologies. Furthermore, this research also elaborates the key factors influencing the SW treatment performance, such as pH, temperature, dissolved oxygen, hydraulic retention time and organic loading rate. The potentials for reutilizing energy, biomass and digestate produced during the SW treatment processes are also summarized. Moreover, the obstacles associated with full-scale implementation, long-term treatment, energyefficient design, and nutrient recovery of various resource -utilization -based SW treatment technologies are emphasized. In addition, future research prospective, such as prioritization of process optimization, in-depth exploration of microbial mechanisms, enhancement of energy conversion efficiency, and integration of diverse technologies, are highlighted to expand engineering applications and establish a sustainable SW treatment system
Co-pyrolysis and activation of microalgae and waste polypropylene in the synthesis of nitrogen doped and porous carbon for pollutant adsorption
No full textAlgae and waste plastics are two promising raw materials for the preparation of carbon -based adsorbents, which are regarded as the promising adsorbent to remove pollutants in wastewater. To obtain an activated carbon with well -developed porous structure and abundant functional groups, the mixture of H -rich disposable waste polypropylene (WP) and N -rich Chlorella vulgaris (CV) were selected as precursors through co -pyrolysis and KOH activation. The optimum mass ratio of WP and CV for preparing co -pyrolysis carbon (CPC) was 1:3, while the optimum mass ratio of CPC and KOH for preparing co -pyrolysis activated carbon (CAC) was 1:5 at the activation temperature of 800 degrees C. The morphologies, mean pore diameter, material surface element and degree of graphitization of CAC were analyzed by SEM, BET, XRD, XPS and Raman spectroscopy, respectively. The adsorption kinetics and thermodynamics of tetracycline (TC) onto CPC were investigated. And the sustainability of algal -based activated carbon in adsorption of pollutants has been tested. This study provides a synthesis method of CAC by using algal -based biomass and waste plastics for the absorption of organic pollutants in wastewaters
Revealing Interaction of Fluorinated Propylamine Hydrochloride with Precursor and Defect States of Perovskite Films Toward Efficient Flexible Solar Cells
No full textThe trap state at the surfaces and grain boundaries of perovskite is one of the major obstacles to the further commercialization of flexible perovskite solar cells (FPSCs). Herein, two innovative multifunctional fluorinated propylamine salt 2,2,3,3,3-pentafluoropropylamine hydrochloride (PFPACl) and 3,3,3-triflupropylamine hydrochloride (TFPACl) are in situ introduced onto the photo absorbing layer to improve the performance of the FPSCs. The nuclear magnetic resonance (NMR) spectroscopy indicates strong interactions of both PFPACl and TFPACl with the perovskite precursor components. For the first time, the structures of the supramolecular complexes formed by two additives with FAI are deduced from NOESY NMR data, thus pointing to the importance of the preorganization of the perovskite components in solution before film casting. The experiments and density functional theory(DFT) calculations reveal that PFPACl is likely dissociated more into the form of R-NH3+-Cl- due to the higher electronegativity of the fluoroalkyl tail. Therefore, PFPA(+) binds more strongly to V-FA defects than TFPA(+), and anion Cl- has strong enough interaction with VFAI and uncoordinated Pb2+, leading to homogeneous coverage of PFPACl on the entire surface of the perovskite films and better energy alignment with the hole transport layer. Consequently, PFPACl-treated FPSCs achieved a relatively high PCE of 23.59% with excellent mechanical robustness and operational stability
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