Synthesis of material MOFs (Fe-BTC) by mechanic-chemical method and its application in the reactive dye degradation

Nano Fe-BTC materials were successfully synthesized by mechanical chemical grinding method. Samples were characterized by X-ray difraction (XRD), Fourier-transform infrared spectroscopy (FTIR), N2 adsorption–desorption, Scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDS). SEM image of Fe-BTC-60 showed the particle size of 40–60 nm. Fe-BTC nanocomposites were tested for the photocatalytic degradation of reactive yellow 145 (RY-145) in aqueous solution. Fe-BTC composites exhibited high photocatalytic activity. Thus, at pH of 3 and high initial concentration of 100 mg RY-145/L, removal efficiency reached the value of 97.45% after 90 min of reaction.

Synthesis and Application of Zn‑BTC/GO Nanocomposites as Highly Efficient Photocatalysts in the Dye Degradation

Nanocomposite Zn-BTC/GO (BTC: benzene-1,3,5-tricarboxylic, GO: graphene oxide) was successfully synthesized by hydrothermal treatment with a microwave method. Samples were characterized by XRD, FTIR, EDS-mapping, BET, SEM, UV-vis DRS and XPS. SEM-image result showed nano Zn-BTC/GO particles size of 50-80 nm. Nanocomposite Zn-BTC/GO showed the a high surface area (1303 m2/g) and pore volume (1.08 cm3/g). The Zn-BTC/GO nanocomposite were tested for the photocatalytic degradation of reactive dye (Reactive Red 195) in an aqueous solution. The Zn-BTC/GO composites exhibited high photocatalytic activity. Thus, at the pH of 6.5 and the high initial concentration of 30 mg RR-195/L, removal efficiency reached the value of 96.16% after 60 min reaction. Moreover, nano Zn-BTC also showed high RR-195 removal efficiency after 3 catalytic regeneration. This contributes to sustainable development and green chemistry.

Phytoextraction, Accumulation and Toxicological Effects of 1-Tetradecyl-3-Methylimidazolium Ionic Liquid in Ryegrass

Ionic liquids are widely used in many fields due to their extremely tunable nature and exceptional properties. The extensive application of ionic liquids raises great concerns regarding their bioaccumulation potential and adverse effects on organisms.Green plants have a great potential for uptake of persistent xenobiotics from aquatic and terrestrial environment. However, the assimilation and bioaccumulation of 1-tetradecyl-3-methylimidazolium bromide ([C14mim]Br) has not been studied in plantsyet. In order to explore the phytoaccumulationof [C14mim]+, ryegrass were exposed to [C14mim]Br with hydroponic experiment.The effects of [C14mim]Brdosages on growth index, chlorophyll content, malondialdehyde (MAD) content and antioxidant enzyme activity of ryegrass were investigated. The toxic effects of[C14mim]Bron ryegrass growth increased with increasing initial concentration. The high initial concentration treatment resulted in rapid changes in physiological characteristics in ryegrass tissue. [C14mim]+ions were mainly accumulated in root tissue and partly translocated to the above ground part of ryegrass.[C14mim]+was observed in the highest concentration (314.35 µg/gin root and 101.42 µg/gin aboveground partsof ryegrass) with 10 mg/L of [C14mim]Br.Our results demonstrated that ryegrass can uptake and accumulate [C14mim]+ and is therefore a suitable species for phytroremediationof trace amount of [C14mim]+ and possibly other ionic liquids.

Synthesis and Application of Fe‑BTC Nanocomposites as Highly Efficient Photocatalysts in the Dye Degradation

Nano Fe-BTC composites were successfully synthesized by hydrothermal treatment with an ultrasonic method. Samples were characterized by XRD, FTIR, BET, SEM, EDS, and XPS. SEM result showed nano Fe-BTC particles size of 10-30 nm. Nano Fe-BTC showed the high surface area (1258 m2/g) and pore volume (0.99 cm3/g). Fe-BTC nanocomposites were tested for the photocatalytic degradation of reactive dye (reactive yellow RY-145) in aqueous solution. Fe-BTC composites exhibited high photocatalytic activity. Thus, at the pH of 6.5 and the high initial concentration of 100 mg RY-145/L, removal efficiency reached the value of 98.13% after 60 min. of reaction. Moreover, nano Fe-BTC also showed high RY-145 removal efficiency after 3 catalytic regeneration. This contributes to the sustainable development and green chemistry.

The Role of Leptin Levels in Adaptation to Cold Climates

Currently, adipose tissue is considered an endocrine organ that produces hormone-active substances, including leptin, which can play a key role in thermoregulation processes. Therefore, we performed a meta-analysis to investigate the influence of the climatic environment on leptin levels. A systematic literature search in the databases was carried out on 10 January 2020. Finally, 22 eligible articles were included in the current meta-analysis and a total of 13,320 participants were covered in the final analysis. It was shown that males of the “North” subgroup demonstrated significantly higher levels of leptin (10.02 ng/mL; CI: 7.92–12.13) than males of the “South” subgroup (4.9 ng/mL; CI: 3.71–6.25) (p = 0.0001). On the contrary, in the female group, a similar pattern was not detected (p = 0.91). Apparently, in order to maintain body temperature, higher leptin levels are required. The results of the study indicate that such effects are most pronounced in males and to a smaller extent in females, apparently due to a relatively high initial concentration of leptin in females. The correlation between leptin levels and climatic environment data support the hypothesis of leptin-mediated thermoregulation as an adaptive mechanism to cold climates.

Consequences in a softwood kraft pulp mill of initial high alkali concentration in the impregnation stage

Impregnation with high initial concentration is fast and efficient, leading to a homogeneous delignification in the subsequent cook, resulting in improved screened pulp yield. To obtain high initial alkali concentration, the white liquor flow needs to be significantly increased. The moisture content of the wood chips and the alkali concentration of the white liquor limit the initial alkali concentration of the impregnation liquor that can be reached. It is therefore of interest to evaluate the possibility to implement high alkali impregnation (HAI) industrially and the consequences this would have on the mill system. The effect of HAI on mass and energy balances in a kraft pulp mill has been studied using mill model simulations. The sensitivity to disturbances in important parameters for process control has been compared to impregnation scenarios used industrially. It was shown that high initial alkali concentration can be achieved on industrial scale by increased white liquor flow. HAI has a positive effect on recovery flows and reduces the need for make-up chemicals. The HAI concept is less sensitive to variations in process parameters, such as chip moisture and white liquor concentration, thus diminishing the risk of alkali depletion in chip cores.

Removal of Oil Using Activated Carbon from Textile Sludge Biochars

The study of oil pollution is crucial nowadays and considered as one of the critical issues as oil pollution gives bad effects especially to wastewater treatment facilities. For that purpose, this study investigated the potential of activated carbon from biochars of textile sludge precursors for oil removal. The activated carbons were produced from biochar obtained through the pyrolysis of textile sludge waste by chemical activation with 1M of phosphoric acid which denoted as AC-B-H3PO4. Apart from that, the performance of adsorptive properties of the activated carbon was tested using simulated cooking oil waste water in homogeneous form as the targeted adsorbate. The effect of adsorption contact time and initial concentration of simulated oil wastewater towards performances of AC-B-H3PO4 in removal of simulated oil wastewater were studied and compared with biochars700. The equilibrium time in adsorption of the simulated oil wastewater for both biochar700 and AC-B-H3PO4 was obtained in 30min. Meanwhile, the effects of initial concentration of simulated oil wastewater, biochars700 has earlier achieved equilibrium at 300mg/l up to 500 mg/l, while for AC-B-H3PO4, the adsorption capacity still increase at a high initial concentration of simulated oil waste water but in a slow rate. The results obtained showed that AC-B-H3PO4 has more potential for oil spills treatment than biochars due to its ability to treat the high initial concentration of simulated oil wastewater at the equilibrium time. The findings also provide for an alternative for low cost and effective adsorbent for the oil pollution treatment.

Removal of Cu (II) Ions by a Novel Starch-Based Adsorbent from Aqueous Solution

A novel starch-based material, designated as DASU-EDTA, was firstly prepared by the reaction of EDTA anhydride with previously synthesized dialdehyde urea starch (DASU). This material was characterized by IR spectroscopy and used as an adsorbent to remove Cu (II) ions from aqueous solution. The IR results showed EDTA was successfully attached to the glucose units of starch, and DASU-EDTA was one of starch amides derivatives. The adsorption tests revealed that the adsorption of DASU-EDTA for Cu (II) ions was an endothermic process, which mainly relied on the strong chelation of EDTA to metal ions. The optimal conditions should be controlled at pH 5.0 and 120min. In addition, it was found that the high initial concentration of Cu (II) ions was favorable for the adsorption of DASU-EDTA for Cu (II) ions.