In today's modern world, noise pollution is recognized as a major environmental problem that people face daily. Polymeric aerogels are porous materials known for their ability to absorb sound, which have attracted significant interest owing distinctive characteristics, including sustainability, recyclability, versatility, and remarkable stability. this study, nine different samples of polysaccharide were created using two natural gums (Iranian gum tragacanth gum), well like wheat straw,...

Introduction: Exposure to various chemicals can occur in the workplace. Polycyclic aromatic hydrocarbons (PAHs) are among these compounds. The aim of this study was investigate relationship between exposure PAHs and urinary metabolites built-up roofing installers Material Methods: current case-control study, conducted 2021 Ilam City, involved 35 builtup workers as case group 15 non-exposed control group. In addition workers’ respiratory area, samples were taken from urine determine amount...

Background: Today, advances in different areas of science and technology along with their application industries have led to an increase dangerous pollutants which can resist biodegradation. Volatile organic compounds (VOCs) are regarded as important factors air pollution closed environments. Xylene is one these produced mass quantities widely used industries, therefore, the removal this compound necessary. One available technologies for removing photocatalytic degradation. The present study...

The objective of this investigation was to study the adsorption formaldehyde (CH 2 O) vapor on bone char (BC) using isotherm models.The BC as an adsorbent produced from cattle and sheep bones by pyrolysis in furnace.The breakthrough time equilibrium capacity CH O were studied.The Yoon Nelson model applied investigate behavior columns for fraction less than 50%.The k' t values used calculate entire curve regarding columns.The maximum value BET, apparent density average pore size 105.24 m /g,...

Ethyl benzene is a volatile organic compound that widely used in various industries. hazardous air pollutant not only for the environment but also human health and hence there possibility of carcinogenesis long-term exposure. Considering fact ethyl photo catalytic activity based removal VOCS vapors under visible light irradiation leading to serious problems, present study aimed evaluate gas-phase from airflow using property titanium dioxide on 13X zeolite, Ahvaz, Iran. In this experimental...

The present study examined the gas-phase photocatalytic degradation of toluene using ZnO-SnO2 nanocomposite supported on activated carbon in a reactor. Toluene was selected as model pollutant from volatile organic compounds to determine pathway and factors influencing this degradation. synthesized through co-precipitation method ratio 2:1 then carbon. immobilization determined by surface area scanning electron micrograph technique proposed Brunauer, Emmett, Teller. laboratory findings showed...

Background: Volatile organic compounds are the major environmental pollutants causing adverse effects on human health and environment, therefore, tremendous effort has been put toward eliminating these compounds. Methods: In this study, effect of synthesized nanoparticles removal styrene from gas phase by photocatalytic process under UV irradiation in cylindrical photoreactor was studied. The activated carbon-zinc oxide (AC-ZnO) catalysts were prepared at different weight ratios (6%, 12%,...

Photocatalytic Removal of Xylene Vapor from Air Flow by Using Titanium Dioxide Nanoparticles Immobilized on Synthesis Type 5 Zeolite

Background: One of the biggest global occupational threats, especially in outdoor workplace, is climate change and warming, as workers are exposed to heat stress leading reduced performance. The aim this study was investigate effect workplace on labor productivity index agricultural sector. Methods: In study, data related environmental variables 215 synoptic meteorological stations Khuzestan province were collected from three climatic regions (hot, mild, cold). Using MATLAB R 2018b...

Background: Fumes released form welding activities are capable of initiating several acute and chronic respiratory effects. Objectives: The aim the present study was to evaluate symptoms spirometry parameters in welders a steel industry. Methods: This cross-sectional conducted industry involved 60 40 non-welders. A questionnaire used record participants’ details, determine pulmonary function values spirometric test used. Pearson correlation, paired independent t as statistic tests were for...

Background: The emission of volatile organic compounds (VOCs) in industrial and urban areas has adverse effects on the environment human health. Toluene, main pollutant among VOCs, wide applications different industries such as plastics, adhesives, silicone sealant, paint, etc. This study aimed to remove toluene from air by using TiO2 nanoparticles supported natural zeolite photocatalytic process. Methods: is an experimental that was conducted 2017 Chemical Agents Laboratory Occupational...

Effect of the Type Ultraviolet on Photocatalytic Removal Xylene as a Pollutant in Air Using TiO2 Nanoparticles Fixed Activated Carbon

Background: Illumination is a physical factor in workspaces. This an important risk for vision health, employees comfort, preventing accidents etc. and should be standardized. Objectives: The current study aimed at assessing redesigning the illumination steel manufacturing company. Methods: In descriptive cross sectional study, intensity was measured 3 units of Kavian company using network approach by TES 1339 lux meter. were divided into square networks, then, redesigned lumen method....

Background: Light is the first that necessary for any effort. This factor, more than physical variable, affects human labor. Two properties of cognitive and psychological lighting in workplace can affect performance. Objectives: study aimed to assess illuminance CO2 Gas unit Khuzestan Zam Company, resolve its light deficiency through artificial design. Materials Methods: a descriptive-analytical based on survey natural sources workplace. It also included measurement levels 3 shifts,...

Background: Noise-Induced Hearing Loss (NIHL) is a preventable occupational health problem, which considered among the 10 major work-related illnesses. According to World Health Organization, repair of noise damage around world costs four million dollars. Objective: The aim this study was determine noise-induced hearing loss in number workers Kaviyan Steel Industry. Methods: In descriptive-analytical being cross-sectional type, status 34 male investigated. present study, were divided 3...