Fever clinic construction and management targeted to prevention and control of healthcare-associated respiratory viral infections in Jiangsu, China: A cross-sectional observational study.

To analyze the post-COVID-19 construction and management of fever clinics targeted to prevention and control of healthcare-associated respiratory viral infections in medical institutions at all levels in China, and to provide a basis for promoting their standardized construction, we conducted this survey on the construction of fever clinics in 429 medical institutions of Jiangsu Province from July to December 2020. Contents of the questionnaire included the general situation of medical institutions, the construction status and future construction plans of fever clinics. We find the construction rate of fever clinic in medical institutions of Jiangsu province was 75.3%. All construction indicators, quality management systems and processes fail to fully meet the requirements of documents and standards. Jiangsu province actively promotes the construction of fever clinic layout, but there is still a gap with the construction standard. As a result, it is necessary to further promote standardized construction of fever clinic, and necessary financial input should be increased to expand all constructions of fever clinic in primary medical institutions.

Mechanisms of chromium and arsenite adsorption by amino-functionalized SBA-15.

The adsorption of Cr(VI) and As(III) by amino-functionalized SBA-15 (NH2-SBA-15) from single and binary systems were investigated in this work. The effects of pH and temperature on the adsorption of NH2-SBA-15 were studied. Adsorption kinetics, isotherm model, and thermodynamics were studied to analyze the experimental data. pH 2 was the optimum condition for the adsorption of Cr(VI) and pH 4 for As(III) adsorption. Increasing temperature had a positive effect on the removal of both Cr(VI) and As(III). The Freundlich isotherm model can depict the adsorption process best. The pseudo-second-order kinetic model fitted well with the kinetic data of Cr(VI) and As(III) in the single-component system. In the binary system, the adsorption of As(III) by NH2-SBA-15 was slightly enhanced with the presence of Cr(VI); however, As(III) had no obvious effect on the removal of Cr(VI). Regeneration experiments indicated that 0.1 mol/L NaHCO3 was an efficient desorbent for the recovery of Cr(VI) and As(III) from NH2-SBA-15; the desorption rates for Cr(VI) and As(III) were 91.6 and 33.59 %, respectively. After five recycling cycles, the removal rates were 88 and 7 % for Cr(VI) and As(III) adsorption by NH2-SBA-15, respectively.

Comparative and competitive adsorption of Cr(VI), As(III), and Ni(II) onto coconut charcoal.

This study evaluates the behavior of coconut charcoal (AC) to adsorb Cr(VI), As(III), and Ni(II) in mono- and multicomponent (binary and ternary) systems. Batch experiments were carried out for mono- and multicomponent systems with varying metal ion concentrations to investigate the competitive adsorption characteristics. The adsorption kinetics followed the mechanism of the pseudo-second-order equation in both single and binary systems, indicating chemical sorption as the rate-limiting step of adsorption mechanism. Equilibrium studies showed that the adsorption of Cr(VI), As(III), and Ni(II) followed the Langmuir model and maximum adsorption capacities were found to be 5.257, 0.042, and 1.748 mg/g, respectively. In multicomponent system, As(III) and Ni(II) adsorption competed intensely, while Cr(VI) adsorption was much less affected by competition than As(III) and Ni(II). With the presence of Cr(VI), the adsorption capacities of As(III) and Ni(II) on AC were higher than those in single system and the metal sorption followed the order of Ni(II) > As(III) > Cr(VI). The results from the sequential adsorption-desorption cycles showed that AC adsorbent held good desorption and reusability.

Biosorption of heavy metal ions (Cu(2+), Mn (2+), Zn (2+), and Fe (3+)) from aqueous solutions using activated sludge: comparison of aerobic activated sludge with anaerobic activated sludge.

The potential of using two different kinds of air drying of activated sludge (aerobic activated sludge and anaerobic activated sludge) for the removal of Cu(2+), Mn(2+), Zn(2+), and Fe(3+) from aqueous solutions was assessed. Results indicated that the maximum biosorption occurred at pH = 5.0 for Cu(2+), Zn(2+), and Mn(2+) and pH = 3.0 for Fe(3+). The kinetic parameters of biosorption data were found to be best fitted to the second-order equation. Also, it was found that the best dosage for biosorption was 0.2 g for both aerobic activated sludge and anaerobic activated sludge. The experimental results were fitted well to the Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherms. The maximum biosorption capacities of Cu(2+), Mn(2+), Zn(2+), and Fe(3+) for aerobic activated sludge were 65.789, 44.843, 64.935, and 75.756 mg/g, respectively, while they were 59.880, 49.020, 62.500, and 69.444 mg/g for anaerobic activated sludge, respectively. The mean free energy values evaluated from the D-R model indicated that the biosorptions of studied heavy metal ions onto activated sludge were taken place by chemical interaction. The results of this study provided valuable information on the biosorption of heavy metals by activated sludge that may contribute in wastewater treatment.

The characteristics of waste Saccharomyces cerevisiae biosorption of arsenic(III).

PURPOSE: The potential of using waste Saccharomyces cerevisiae as adsorbent for the adsorption of As(III) from aqueous solution was assessed. METHODS: The biosorbent was characterized by Fourier transform infrared (FTIR) spectroscopy analysis. Various parameters including pH, biosorbent dosage, contact time, and temperature were systematically investigated. RESULTS AND CONCLUSIONS: The FTIR results of S. cerevisiae biomass showed that biomass has different functional groups, and these functional groups are able to react with metal ion in aqueous solution. Several biosorption isotherms were used to fit the equilibrium data, showing sorption to be monolayer on the heterogeneous surface of the biosorbent. The maximum biosorption capacity calculated using Langmuir model was found to be 62.908 µg/g at pH 5.0, biosorbent dosage 5 g/L, contact time 240 min, and temperature 35 °C. The kinetic studies indicated that the biosorption process of the As(III) followed well the pseudo-second-order equation. The intraparticle diffusion and Richenberg models were applied to the data, and we found that the biosorption of As(III) was governed by film diffusion followed by intraparticle diffusion. The thermodynamics constants indicated that the biosorption of As(III) onto S. cerevisiae was spontaneous and endothermic under examined conditions. Biosorbent could be regenerated using 0.5 M NaOH solution, with up to 75 % recovery.

Biosorption of Basic Violet 5BN and Basic Green by waste brewery's yeast from single and multicomponent systems.

BACKGROUND AND AIM: The biosorption of Basic Violet 5BN (BV) and Basic Green (BG) by waste brewery's yeast (WBY) from single and binary systems was investigated. RESULTS AND DISCUSSION: For the single system, the adsorption of both dyes is pH-dependent and the optimum value is 5.0. At a lower initial concentration, the kinetic data agree well with both pseudo-first-order and pseudo-second-order models, while at a higher initial concentration the data fit better with the pseudo-second-order model. External diffusion is the rate-controlling step at initial fast adsorption, and then the intraparticle diffusion dominated the mass transfer process. Equilibrium data for BV and BG fit better with the Langmuir model. The maximum biosorption capacities of WBY onto BV and BG obtained at 303 K are 114.65 and 141.89 mg/g, respectively. Thermodynamic analysis reveals that the adsorption process for the two dyes is spontaneous and exothermic. CONCLUSIONS: The hydroxyl, amino, amide, carboxyl, and phosphate groups are responsible for the biosorption based on Fourier transform infrared analysis. The presence of BV significantly affects the biosorption of BG, but not vice versa. The P-factor model and Sheindrof-Rebhun-Sheintuch equation gave a good description of the equilibrium adsorption data at the multicomponent system.