Institutional Repository of GuangZhou Institute of Energy Conversion, CAS
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Mitigation of thallium threat in paddy soil and rice plant by application of functional biochar
No full textThallium (Tl) is a highly toxic metal, and its contamination in soils entails high risks to human health via food chain. It remains largely unknown of the effects of applying biochar on Tl uptake in paddy systems despite that few studies have shown that biochar exhibits great potential for decreasing Tl bioavailability in soils. Herein, we examined the mitigating effects of the application of biochar (5 and 20 g/kg pristine biochar; 5 and 20 g/kg Fe/ Mn-modified biochar) on Tl uptake in paddy soil and rice plant after an entire rice growth period. The results suggested that the application of Fe/Mn-modified biochar (FMBC) considerably mitigated the accumulation of Tl in different tissues of rice plants. Specifically, total Tl content in rice plants treated with FMBC-20 decreased by over 75% compared with control experiment. In addition, the amendment of FMBC in Tl-rich paddy soils can enhance the communities of microorganisms (Actinobacteria and Proteobacteria). Further analysis of the soil microbial symbiosis network revealed that FMBC promotes the living microorganisms to play modular synergistic interactions, which is crucial for FMBC-induced Tl stabilization in soils. All these findings indicated that FMBC is an efficient and environmentally friendly Tl-immobilization alternative material and can be potentially used in the remediation of Tl-contaminated paddy soils and/or cropland
Highly active metal-acid bifunctional B-doped radial channel silica supported Ni2P for efficient hydrodeoxygenation performance
No full textUpgrading bio-oil into high-quality hydrocarbon fuel through hydrodeoxygenation (HDO) is highly desirable. Here we describe a method for fabricating a Ni2P metal-acid bifunctional catalyst (Ni2P/RCSN-B) supported on B-doped radial channels silica by a facile anion-assisted hydrothermal method. The results showed that the doped B was entered into the skeleton of RCSN to form the trigonally and tetrahedrally coordinated B species, providing the adjustable acid sites, which is responsible for the high target methylcyclohexane (MCH) product selectivity. And the radial channel pore structure promotes the efficient exposure of active sites, accelerates the mass transfer and leads to highly dispersed small Ni2P particles. Importantly, the kinetics study proved a high reaction constant for the constructed Ni2P/RCSN-B catalyst as compared to that of Ni2P supported on traditional SiO2 support, indicating the important role of the radial channel pore structure on shortening the reaction time. Benefit from the optimized acidity, rapid mass transfer and highly dispersed small Ni2P particles, Ni2P/RCSN-B achieved superior m-cresol HDO performance with HDO activity reaching 96.5 % and the selectivity to MCH reaching 91.5% within 1 h. There is no doubt that the combination of Ni2P and RCSN-B opens up a new idea for preparing high performance HDO catalysts
Key Research Program of Frontier Sciences, Chinese Academy of Sciences(CAS)[ZDBS-LY-SLH041]
No full textFuture scenario generation and reduction methods for solar photovoltaic electricity production analysis
No full textAbstract
A morphing-clustering-based method of generation and reduction future scenario for solar photovoltaic electricity production analysis is studied. Present historical annual weather data are transformed into future scenarios and timeframes by a morphing method with a general circulation model. The Copula methodology is applied to model the forthcoming decade’s annual meteorological data and generate abundant intra-day hourly scenario samples. The comparative analysis of the photovoltaic power output variations between future and present in reduction typical scenarios is conducted by the K-means clustering method with appropriate clustering parameter optimization. The simulation results show that the annual mean variations in global horizontal radiation, dry bulb temperature, and wind speed are projected to increase by approximately from 20.1 to 36.5 W/m2, 1.6 to 2.3°C, and 0.1 to 0.6 m/s, respectively in the forthcoming scenario of shared socioeconomic pathways 2-4.5. It is seen that solar photovoltaic electricity production anticipates a positive increase from 2.5% to 17.9%
Enhancing detoxification of inhibitors in lignocellulosic pretreatment wastewater by bacterial Action: A pathway to improved biomass utilization
No full textThe process of preprocessing techniques such as acid and alkali pretreatment in lignocellulosic industry generates substantial solid residues and lignocellulosic pretreatment wastewater (LPW) containing glucose, xylose and toxic byproducts. In this study, furfural and vanillin were selected as model toxic byproducts. Kurthia huakuii as potential strain could tolerate to high concentrations of inhibitors. The results indicated that vanillin exhibited a higher inhibitory effect on K. huakuii (3.95 % inhibition rate at 1 g/L than furfural (0.45 %). However, 0.5 g/L vanillin promoted the bacterial growth (-2.35 % inhibition rate). Interestingly, the combination of furfural and vanillin exhibited antagonistic effects on bacterial growth (Q<0.85). Furfural and vanillin could be bio-transformed into less toxic molecules (furfuryl alcohol, furoic acid, vanillyl alcohol, and vanillic acid) by K. huakuii, and inhibitor degradation rate could be promoted by expression of antioxidant enzymes. This study provides important insights into how bacteria detoxify inhibitors in LPW, potentially enhancing resource utilization
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