The Study on the Active Site Regulated RuOx/Sn0.2Ti0.8O2 Catalysts with Different Ru Precursors for the Catalytic Oxidation of Dichloromethane

Chlorine-containing volatile organic compounds (CVOCs) present in industrial exhaust gas can cause great harm to the human body and the environment. In order to further study the catalytic oxidation of CVOCs, an active site regulated RuOx/Sn0.2Ti0.8O2 catalyst with different Ru precursors was developed. With Dichloromethane as the model molecule, the activity test results showed that the optimization of Ru precursor using Ru colloid significantly increased the activity of the catalyst (T90 was reduced by about 90 °C when the Ru loading was 1 wt%). The analysis of characterization results showed that the improvement of the catalytic performance was mainly due to the improvement of the active species dispersion (the size of Ru cluster was reduced from 3–4 nm to about 1.3 nm) and the enhancement of the interaction between the active species and the support. The utilization efficiency of the active components was improved by nearly doubling TOF value, and the overall oxidation performance of the catalyst was also enhanced. The relationship between the Ru loading and the catalytic activity of the catalyst was also studied to better determine the optimal Ru loading. It could be found that with the increase in Ru loading, the dispersibility of RuOx species on the catalyst surface gradually decreased, despite the increase in their total amount. The combined influence of these two effects led to little change in the catalytic activity of the catalyst at first, and then a significant increase. Therefore, this research is meaningful for the efficient treatment of CVOCs and further reducing the content of active components in the catalysts.

Augmented CO2 tolerance by expressing a single H+-pump enables microalgal valorization of industrial flue gas

Microalgae can accumulate various carbon-neutral products, but their real-world applications are hindered by their CO2 susceptibility. Herein, the transcriptomic changes in a model microalga, Chlamydomonas reinhardtii, in a high-CO2 milieu (20%) are evaluated. The primary toxicity mechanism consists of aberrantly low expression of plasma membrane H+-ATPases (PMAs) accompanied by intracellular acidification. Our results demonstrate that the expression of a universally expressible PMA in wild-type strains makes them capable of not only thriving in acidity levels that they usually cannot survive but also exhibiting 3.2-fold increased photoautotrophic production against high CO2 via maintenance of a higher cytoplasmic pH. A proof-of-concept experiment involving cultivation with toxic flue gas (13 vol% CO2, 20 ppm NOX, and 32 ppm SOX) shows that the production of CO2-based bioproducts by the strain is doubled compared with that by the wild-type, implying that this strategy potentially enables the microalgal valorization of CO2 in industrial exhaust.

Hubungan Jumlah Eritrosit dan Hitung Jenis Leukosit pada Masyarakat dengan Paparan Polutan Tinggi di Desa Tambak Mulyo Kota Semarang

Lead (Pb) and carbon monoxide (CO) are gas components in airborne pollutants due to vehicle fumes or industrial exhaust gases that affect the blood, namely shortening the life span of erythrocytes produced in erythropoiesis. In addition, small pollutants can be inhaled and enter the alveoli and then phagocytosis and trigger the release of mediators, namely leukocyte cells, which can cause inflammation. This study aims to determine the correlation between the erythrocytes count and differential leucocyte count of the Tambak Mulyo village community, Semarang City. This research was a cross-sectional analytic study of primary data using 20 blood samples, carried out by the erythrocytes count and differential leucocyte count tests. The examination results showed that the average erythrocytes count in all samples was 5.25 million cells/mm3 with a percentage of the normal erythrocytes count is 45.00%, and a high of erythrocytes count is 55.0%. On the test of the differential leucocyte count, 4 samples are obtained with specific values. Normal leukocytes and as many as 16 samples experienced an increase and decrease in the differential leucocyte count. The chi-square test shows Asymp.Sig> 0.05, which means there is no correlation between variables, so it can be concluded that there is no significant correlation between the erythrocytes count and differential leucocyte count (lymphocytes, basophils, eosinophils, neutrophils, and monocytes) in the community with exposure to high pollutants in Tambak Mulyo village, Semarang City.