Papers by Keyword: Environmentally Friendly

Abstract: There are various approaches to prevent or reduce the transmission of dengue fever, one of which involves interrupting the vector's life cycle through the use of pesticides and biological control methods. Considering the significant impact of synthetic pesticides on the environment, the utilization of natural ingredients such as botanical pesticides is a prudent option. These have minimal to no adverse effects on the environment and are relatively safe for animals and humans. This research aimed to assess the efficacy of a larvicide derived from duku peel extract (Lansium domesticum Correa) against L3 larvae of Aedes sp. It employed a quantitative approach, utilizing an experimental design with a post-test control group. A purposive sampling technique was used to select a total of 600 larvae. The data collected were then analyzed using SPSS version 23. The initial test involved data normalization, with a p-value >0.05 indicating normal distribution of the data. Subsequently, the Pearson correlation test was conducted, revealing a significant correlation with a p-value of 0.000 <0.05. The variables had a strong connection at a Pearson correlation value of 0.998. Probit regression analysis was then performed, yielding results of 4.699 µg/mL for LC50 and 11.234 for LC90 µg/mL.

Abstract: The protection of metal parts against corrosion damage is one of the most comprehensive areas of industrial chemistry and a wide range of methods exists to protect the surface from corrosive stimulators, including phosphating. A key phosphating process, the tricationic phosphating, consists of baths containing zinc dihydrogen phosphate and other cations, such as Zn²⁺, Co²⁺, Ni²⁺ or Mg²⁺. However, cobalt and nickel ions are classified as environmentally harmful and they are being actively excluded from industrial processes. The use of sufficiently micronized zinc phosphate dihydrate (µ-Zn₃(PO₂)₂ · 2H₂O) is one the possible approaches to significantly reduce or eliminate heavy metals from the phosphating process. The micronized zinc phosphate dihydrate serves as a nucleus on the metal surface to form a sufficiently high-quality phosphate layer. The study aims to find a procedurally optimal dispersion methodology suitable for application in the Czech Republic. The use of progressive grinding methods such as the jet mills is emphasized and shows promising results.

Abstract: The nanoparticles synthesized by plants and micro-organisms are environmentally safe and do not leave residues or long-term toxic effects in ecosystems or accumulate in the environment and transfer through the food chain. Therefore, the aim of the research is to synthesize silver nanoparticles from the leaves of the oleander plant, where they are environmentally friendly when used for various purposes such as controlling agricultural pests. The results showed that the leaves of this plant have the ability to synthesize silver nanoparticles and this is confirmed by the tests of color change of the plant extract the reaction solution, the color of the solution changed from colorless to pink. Physical diagnostic tests such as absorption using a UV-Visible spectrophotometer at a wavelength of 340 nm, transmission electron microscope (TEM) and X-ray diffraction (XRD) technique have confirmed the formation of AgNPs in the leaves of a plant oleander. Keywords: silver nanoparticles, synthesis, environmentally friendly, physical diagnosis

Abstract: Sorption resistances of environmentally friendly polymeric materials in different liquid mediums are studying in this work. As part of environmentally friendly polymeric materials based on polylactide, OK compost HOME plastic and coffee grounds sorption studying in different liquid mediums, the most stable compositions were identified in terms of size stability and diffusion coefficient. microscopic analysis of new environmentally friendly polymeric materials before and after exposure in operating liquid mediums was made and compositions with the least surface changes were determined.

Abstract: Novel fluorescent nanomaterials have attracted enormous interests in the applications of illumination and display besides the traditional organic fluorophors. As potential alternatives, the environmental friendly fluorescent ultra-small organic-inorganic hybrid metal nanoclusters (size < 2 nm) is a series of powerful competitors used in illuminating field, on account of the non-poisonous, large amount of storage in earth, simple synthetic route, and relative low cost. The most important one, facile regulation of the fluorescence intensity and emission colors makes metal nanoclusters more attractive candidates for illumination application. Here, through ingeniously designing the structures of capping ligands, the highly bright copper nanoclusters are obtained, which further assemble into 2D ribbons with fluorescence quantum efficiency ascending to 36.4%. Last, the light emitting diodes with excellent performance are constructed, the emission wavelength locates at 650 nm in red region, which is suitable for plant illumination.

Abstract: As the ancient metal, Sn is widely used in all aspects of human life. Nowadays, S, as the vulcanizing agent, is used in the process of refining tin to separate Cu and Sn. However, there are few reports about the other agent of removing copper from stannum. In this study, SnS, a new sulfiding agent to separate Cu and Sn, was investigated. During the process, SnS replaces the combination of Sn and Cu. The variables considered in the experimental study were reaction temperature, time and the ratio of reactants. The experimental data indicated under certain conditions, the removal rate of Cu reach 94.3%. At last, we studied the vacuum reaction of Cu₂S and Sn, results indicated that under appropriate conditions, the Cu is detected. The SnS is formed. And after the vacuum reaction, the SnS could be used recycling. This work presented a promising technology for separating Cu from tin.

Abstract: As a new type of unsaturated linear magnetoresistive materials, tungsten ditelluride series material has potential applications in the fields of strong magnetic detection, information recording and magnetic storage devices. The current development concepts of “green materials”, “green chemical technology” and “environmentally friendly technology” require us to pursue the non-toxic, low-emission and non-emission in material synthesis technology. At the same time, the prepared products show excellent performance and high versatility and efficiency. According to our previous work, the study attempts to use a low-volatile amine solvent as a pretreatment raw material to synthesize a tungsten germanium-based linear magnetoresistive material by hydrothermal/solvothermal method and self-fluxing method. The obtained materials were subjected to XRD, Raman, SEM and Magnetoresistance. Experimental results show that when the mass ratio of W and Te is 1:4, the prepared material is pure phase and the sample is the layered structure. The Magnetoresistance Property points out that the maximum value is about 190 %, which appears in the condition of 10 K and 7 T. Those test projects include phase, structure and morphology characteristics, and provide technical parameters and methods for the development of green synthesis and potential applications of tungsten ditelluride series linear magnetoresistive materials.

Abstract: As the petroleum industry is facing challenges to add more oil reserves in their book, greater emphasis has been placed on improving the ultimate recovery factor for oilfields. When the recovery from primary and secondary methods could not be improved further, enhanced oil recovery (EOR) generally will be sought as the last option. One of the techniques applied in EOR is known as surfactant flooding. Though surfactants are very effective for the incremental oil recovery, there are implications during the post-flooding process. EOR surfactants that derived from petrochemicals generally display negative effects towards the marine ecosystem. This initial study aims to evaluate the potential application of palm oil based methyl ester sulfonate (MES) as a possible candidate for EOR application. Three qualitative and quantitative tests were performed on MES to evaluate its properties and capabilities for application in a specific offshore field. The results obtained from the qualitative compatibility and stability tests show that this anionic surfactant has great stability and compatibility with the brine solution as there are no visible signs of precipitation formation. However, the qualitative phase behavior test results indicated that the surfactant solution although has the ability to react with the crude oil but not at the required micro-emulsion state. In addition, the quantitative interfacial tension (IFT) test results also verified and supported the phase behavior test results where the strength of the MES was not adequate as a single surfactant system to achieve the ultra-low IFT state.

Abstract: When dealing with a low-grade complex Zinc ore from Inner Mongolia, problems of low leaching rate, high energy consumption, low economic benefits and pollution were encountered. To treat this low-grade zinc ore economically and effectively, bioleaching was used. This approach produces reliable data for an environmentally friendly and efficient processing of the zinc ore. The results indicate that Zinc occurs in the ore mainly as sphalerite, the latter also containing Indium. The experimental results demonstrated an excellent leaching performance: A leaching rate of nearly 100% is achieved at a temperature of 45°C, a pulp concentration of 10%, an initial pH of 1.8, and an aeration rate of 0.8m³/h. In the initial stage the leaching rate is higher than at the end. It starts with 85% of zinc leaching rate in three days. The Indium in the sphalerite is leached almost completely. This makes a further comprehensive use of such resources possible.

Abstract: The precipitation of Ca₃(PO₄)₂ scale on pipe surfaces widely occurs in numerous industrial processes. For the control of Ca₃(PO₄)₂ scales, a novel environmentally friendly type of scale inhibitor Maleic anhydride (MA) - allypolyethoxy carboxylate (APEM) was synthesized. Structures of APEG, APEM, and MA-APEM were identified by FT-IR. MA-APEM possess excellent Ca₃(PO₄)₂ inhibition, approximately 96.7 % at threshold dosage of 6 mg/L, and it also have superior ability to iron (III) dispersion in solutions approximately 24.3 % in the presence of MA-APEM when the dosage exceeds 6 mg/L. Inhibitor of MA-APEM can be used safely in cooling water systems.