نشریه کاربرد شیمی در محیط زیست
پیاپی 52 (زمستان 1401)

Mining activities lead to the production of large amounts of heavy metals such as lead (Pb), zinc (Zn), arsenic (As), cadmium (Cd) and nickel (Ni). Concentrations higher than the standard values will have harmful effects on the environment and the normal functioning of systems and organisms where these elements accumulate. One of the major destructive results of these activities is the contamination of underground water due to the accumulation of mine tailings. If the tailings are not properly controlled and managed, their harmful substances enter the surface and underground waters and pollute the area. In last years, the use of biotechnology achievements and especially microorganisms in order to remove heavy metals and their compounds has been very effective. Depending on the intensity of pollution, the cell structure of these microorganisms may be changed to the extent that they can tolerate higher concentrations of heavy metals. In other words, they can adapt to higher concentrations.

Because of the heavy effects that risk has had on individuals, groups, and societies since the beginning of history, they have developed several methods for risk. In this research, different jobs in the operation of the gas company of Ardabil province and related jobs were identified and after evaluating them, the degree of risk and probability of occurrence was identified for each of the jobs, then the risk was assessed using the JSA method and the results were Modeling was done using Pro-PHA software. The results of the research showed that a total of 121 operations were identified in the process of this evaluation, out of which 22 cases had high risk and the possibility of an accident, 65 cases were within the risk control range, and 34 cases were low risk, that is, 28% had low risk and were under control. It is 54% of it is within risk control and needs action, finally, 18% has high risk and needs self-action.

One of today's environmental issues is the creation of sewage containing organic dyes by dyeing industries. These pollutants have caused many damages to humans and other creatures. In this project, Fe3O4@GT nanocomposite was synthesized by Fe3O4 magnetic nanoparticles and tragacanth gum. tragacanth gum was used as an important and functional component to improve absorption speed. Then, with the help of this nanocomposite, the removal quality of methylene blue was checked. Conditions such as the amount of absorbent, the amount of methylene blue, the pH of the environment and the temperature of the environment were investigated in the quality of removal of methylene blue, and Taguchi method was used to find the optimal results. XRD, FTIR, DLS, SEM, and VSM were used for sample analysis. FTIR results proved the presence of functional groups of tragacanth hydrogel on the surface of nanoparticles. The particle size of the nanocomposite obtained by DLS method was 96.24 nm and the VSM value for the nanocomposite was 31.33 emu/g. The optimum condition of the adsorbent was in alkaline pH and the high amount of pollutant reduced the adsorption percentage. Increasing the ambient temperature improved absorption. It was found that Fe3O4@GT nanocomposite has a high adsorption performance on methylene blue with a removal rate of 86.4% after 4 hours.

Today, the goal of protecting the environment is to achieve sustainable development in the form of economic programs in harmony with the principles of environmental protection and preventing the destruction and depletion of renewable and non-renewable resources. Green management is the effective and efficient use of all resources to guide the organization to achieve environmental goals with the aim of creating social acceptance and preserving the environment. The current research was conducted with the aim of investigating the condition of sports facilities in terms of dimensions and components of green management. The current research was quantitative in terms of methodology, applied in terms of purpose, and descriptive in terms of data collection. 220 people were selected as a sample from the statistical population that included experts in the field of sports management familiar with the research topic and experts in the field of environment. Green management questionnaire was used to collect data. Data were analyzed using binomial ratio test in SPSS software. The results showed that the current situation of sports facilities and facilities in terms of applying green management in Iran is in an unfavorable situation. The improvement of the environment will be achieved when the natural environment and human culture are related. The necessity of realizing such a goal is the existence of environmental ethics and culture in all strata of a society.

Poly(acrylic acid-co-acrylamide) PAM-AA hydrogel by solution polymerization of acrylic acid (AA) and acrylamide (AM) using ammonium persulfate (APS) as initiator and N',N-methylenebisacrylamide ( MBA) was prepared as a binder. PAM-AA was used to adsorb methyl orange from aqueous solutions. Factors affecting the absorption capacity such as absorption time, initial concentration of methyl orange, amount of superabsorbent hydrogel, pH value were investigated in detail and it was found that PAM-AA is very effective for removing methyl orange from its aqueous solutions. The equilibrium adsorption capacity was 359.89 mg/g at room temperature as initial. The concentration of methyl orange was equal to 3000 mg/liter. The mechanism of the adsorption process was also speculated. The study on the equilibrium adsorption isotherms showed that the adsorption was in accordance with the Langmuir and Freundlich model. Further investigation of the sorption kinetics showed that the sorption process was compatible with the pseudo-second order kinetic model.

dual mixture of Pune-Peppermint extract, Pune-Sourberry, Sour-Peppermint and Triple Blend of Hydroalcoholic extract of Pune, Peppermint and Sorghum used. The extracts were diluted with propylene glycol and in addition to pure extracts, concentrations of 10, 20, 30, 40 and 50 mg / ml of extract were prepared. To study the effect of hydroalcoholic extracts of Pune, Mint and Sour and Dual Blend Triticale extracts of these three plants were used to grow Albicans candidate by antibiotic and MIC methods

The results of this study showed that the triple mixture of Puneh, Mint and Savange extracts with a concentration of 50 mg / ml with a diameter of 32.2 mm had the highest diameter of the inhibition zone and the hydroalcoholic extract Peppermint at a concentration of 10 mg per milliliter with a diameter of 7 mm halo assigns the lowest diameter of the non-growth zone of Candida albicans. Also, the triple mixture of Puneh, Mint and Souri showed relatively similar results to fluconazole antibiotics.

The results of the minimum inhibitory concentration showed that the lowest inhibitory concentration was related to the antibiotic fluconazole and the triple mixture of hydroalcoholic extract of Punea, Mint and Sardinia, and the lowest was the hydroalcoholic extract of Mint herb.