This contribution discloses a new methodology for the preparation of N-doped carbon via the hydrothermal carbonization (HTC) of sewage sludge (SS).

Methods:This study builds a SEIRD model that considers the movement of people across regions, revealing the effects of three measures on controlling the spread of the epidemic.Based on MATLAB R2017a, computational experiments were performed to simulate the epidemic prevention and control measures. Findings: The research results show that current prevention and control measures inChina are very necessary. This study further validates the concerns of international and domestic experts regarding asymptomatic transmission (E-status). Interpretation:The results of this study are applicable to explore the impact of the implementation of relevant measures on the prevention and control of epidemic spread, and to identify key individuals that may exist during the spread of the epidemic.

Achieving heteroatom-doped carbon materials using inorganic matter as the doping source is one of the major challenges for renewable energy storage materials. In this letter, a direct simple and reproducible methodology was designed for the preparation of nitrogen- and sulfur-doped materials by direct hydrothermal carbonization (300 °C for 1 h) of cellulose and ammonium sulfate at a mass ratio of 1:1. This N- and S-doped carbon exhibited an excellent electrochemical performance including high specific capacitance (227.3 F/g) when the current density is 1 A/g; however, its specific capacitance still retained 76.55% from the original when the current density was increased to 20 A/g,.

NaCl and (NH4)2SO4 were selected as typical inorganic salts (10 wt% addition) in order to analyze their effects on the hydrothermal carbonization (HTC) of sewage sludge (SS).