World Journal of Environmental Science and Engineering is an international, peer-reviewed open access journal dedicated to advancing research the field of environmental science and engineering. The journal provides a rapid publication process to ensure wide dissemination of high-quality articles to scientists, professionals, and interested individuals worldwide. Our goal is to serve as an efficient, reliable, and trusted platform for scholars and readers, publishing cutting-edge research in the field.
Abstract: Sanmen Bay is a bay with a large degree of twists and turns and complex topography. With a large area of beaches and rich marine resources such as biological, it has important economic and ecological significance in the coastal area of the East China Sea. Based on a three-year monthly survey of chlorophyll a in the water body of Sanmen Bay from January 2020 to December 2022, a multiple stepwise regression analysis was conducted on chlorophyll a and related environmental factors such as water temperature (T), total organic carbon (TOC), chemical oxygen demand (COD), total phosphorus (TP), total nitrogen (TN), and dissolved oxygen (DO). Significant environmental factors related to chlorophyll a were found, and a multiple regression equation was established. In addition, the temporal and spatial distribution of chlorophyll a content was also analyzed. The results showed that the spatial and temporal differences of chlorophyll-a content in Sanmen Bay were large, ranging from 0.1 to 100 μ g / L. Chlorophyll a concentration was positively correlated with water temperature, COD and TP, negatively correlated with do, TN and TN / TP, but not with pH.Abstract: Sanmen Bay is a bay with a large degree of twists and turns and complex topography. With a large area of beaches and rich marine resources such as biological, it has important economic and ecological significance in the coastal area of the East China Sea. Based on a three-year monthly survey of chlorophyll a in the water body of Sanmen Bay from Jan...Learn More
Abstract: Wastewater treatment is an important aspect of the dyestuffs industry, as the process of dye production generates a large amount of wastewater containing various organic and inorganic pollutants. To protect the environment, effective wastewater treatment methods, such as chemical oxidation and biodegradation, are needed to remove pollutants from the wastewater and to meet the discharge standards. This paper reviews the research progress of dye wastewater treatment methods, including flocculation and precipitation, oxidation, electrochemistry, biodegradation, adsorption, etc. The different treatment methods are introduced and their current status and advantages and disadvantages are reviewed. Chemical methods have short treatment time and good effect, but the process is complicated and not easy to operate, and the intermediate products produced may have greater toxicity; biological methods have the advantages of environmental protection and mild conditions, but the treatment time is generally longer, and the poor biochemistry of many dyestuffs restricts the use of biological methods; physical methods have been widely used because of their simple operation and adaptability, among which adsorption is commonly used in the decoloration treatment of wastewater. Undoubtedly these researches are of great significance in recognizing the nature and characteristics of pollutants and mastering the principles and methodological features of environmental treatment technologies.Abstract: Wastewater treatment is an important aspect of the dyestuffs industry, as the process of dye production generates a large amount of wastewater containing various organic and inorganic pollutants. To protect the environment, effective wastewater treatment methods, such as chemical oxidation and biodegradation, are needed to remove pollutants from th...Learn More
Abstract: Tin dioxide (SnO2) is an N-type semiconductor material, which has a potential application prospect in photocatalysis. The band gap width and electronic structure of tin dioxide can be changed by proper doping treatment, and its photocatalytic performance can be further improved. Using stannous tetrachloride pentahydrate, dodecylamine, oleic acid and lanthanum oxide as raw materials, tin dioxide nano-powders with different lanthanum doping amounts were synthesized by solvothermal method. XRD, SEM and EDS were used to characterize the samples, and the effects of different lanthanum oxide doping amounts on the morphology and structure of tin dioxide powder were investigated. Using Rhodamine B solution as the simulated pollutant, the effects of La doping, Rhodamine B initial concentration and photocatalyst dosage on the photocatalytic performance of tin dioxide powder were studied. The results show that lanthanum is successfully incorporated into SnO2, and no other impurities are introduced in the synthesis of lanthanum doped SnO2, which is a single tetragonal phase; and The electronic structure of SnO2 is changed by lanthanum doping, and the band gap width of SnO2 is reduced to 3.2ev by 5% lanthanum doping. The doping of lanthanum oxide can promote the photocatalytic performance of tin dioxide. When the doping amount is 5%, the degradation rate of Rhodamine B reaches the highest, that is, the degradation rate of Rhodamine B is 100% when the sample with the doping amount of lanthanum 5% is added to 10mg/L Rhodamine B with 80mg to 100ml.Abstract: Tin dioxide (SnO2) is an N-type semiconductor material, which has a potential application prospect in photocatalysis. The band gap width and electronic structure of tin dioxide can be changed by proper doping treatment, and its photocatalytic performance can be further improved. Using stannous tetrachloride pentahydrate, dodecylamine, oleic acid an...Learn More
