Water environment

About: Water environment is a research topic. Over the lifetime, 13384 publications have been published within this topic receiving 125138 citations.

Hybridized 2D Nanomaterials Toward Highly Efficient Photocatalysis for Degrading Pollutants: Current Status and Future Perspectives.

Abstract: Organic pollutants including industrial dyes and chemicals and agricultural waste have become a major environmental issue in recent years. As an alternative to simple adsorption, photocatalytic decontamination is an efficient and energy-saving technology to eliminate these pollutants from water environment, utilizing the energy of external light, and unique function of photocatalysts. Having a large specific surface area, numerous active sites, and varied band structures, 2D nanosheets have exhibited promising applications as an efficient photocatalyst for degrading organic pollutants, particularly hybridization with other functional components. The novel hybridization of 2D nanomaterials with various functional species is summarized systematically with emphasis on their enhanced photocatalytic activities and outstanding performances in environmental remediation. First, the mechanism of photocatalytic degradation is given for discussing the advantages/shortcomings of regular 2D materials and identifying the importance of constructing hybrid 2D photocatalysts. An overview of several types of intensively investigated 2D nanomaterials (i.e., graphene, g-C3 N4 , MoS2 , WO3 , Bi2 O3 , and BiOX) is then given to indicate their hybridized methodologies, synergistic effect, and improved applications in decontamination of organic dyes and other pollutants. Finally, future research directions are rationally suggested based on the current challenges.

Incidence and significance of polynuclear aromatic hydrocarbons in the water environment

Abstract: (1974). Incidence and significance of polynuclear aromatic hydrocarbons in the water environment. C R C Critical Reviews in Environmental Control: Vol. 4, No. 1-4, pp. 69-83.

Vertically-aligned ZnO@ZnS nanorod chip with improved photocatalytic activity for antibiotics degradation

Abstract: The photocatalytic degradation for environmentally hazardous substances has been widely explored with the use of various photocatalysts and techniques. It still remains a challenge to achieve efficient degradation and removal of residual antibiotics in the water environment. Here, we report an improved photocatalytic activity chip for degradation of antibiotic tetracycline hydrochloride by perpendicular ZnS-coated ZnO nanorod arrays (ZnO@ZnS NAs). The enhanced photocatalytic activity contributed to the polycrystalline ZnS shell’s effective inhibition of the recombination of photogenerated electron–hole pairs. Meanwhile, vertically aligned ZnO@ZnS nanorod arrays can increase the light harvesting ability by enhancing scattering of light among ZnO@ZnS NAs. On the basis of these findings, an improved photocatalytic activity ZnO@ZnS NA chip has been fabricated by growth of ZnO NAs on a piece of silicon wafer and further sulfurization. More importantly, ZnO@ZnS NA chips have been utilized to construct a ladderl...

Coal mining impacts on water environs around the Barapukuria coal mining area, Dinajpur, Bangladesh

Abstract: The present research makes an effort towards awareness of the impact of underground coal mining on water environment around the Barapukuria coal mining area, Dinajpur by direct field investigation, questionnaire survey and laboratory analysis. For this research, the three foremost errands have been mulled over which are the water level data analysis for 10 years from 2001 to 2011, ground water major parametric analysis and the questionnaire survey on the availability of ground water before and after coal mining operation. The results of field and laboratory analysis show that the characteristics and concentrations of all the major physical and chemical parameters such as pH, EC, Temperature, HCO3 −, NO3 −, SO4 2−, Cl−, Na+, K+, Mg2+, Ca2+ and Fe(total) are still tolerable for all purposes and also within the standard limit. On the other hand, the questionnaire survey and water level data analysis confirm almost similar results regarding the depletion of water level. The water level has depleted more than 5 m from 2001 to 2011. Therefore, currently the availability of ground water is normal in the rainy and winter seasons but is slight problematic in the dry season where ground water was available at all times prior to coal mining in the area. From these scenarios, it is comprehensible that the ground water level moves downwards than earlier because of the excess pumping of water from the mine area. Besides the natural recharge condition is not enough and somewhere breaks off while some of the mines out areas are subsided, consequently the upper part of the water bearing formations (aquifer) loses its porous and permeable properties resulting water recharging problem which is directly responsible for depleting the ground water level over the area. Moreover, the water levels will also decline relative to the location, depth, recharge, and discharge conditions of the mine both aerially and vertically while there is a typical relationship between the depth of mining and static water level which is water levels will decline more as the mine goes deeper. Therefore, taking into account the current ground water condition and the depth of Barapukuria coal mine, this research implied that the water level will deplete more in day coming and the water crisis will be more for future. Thus, this research recommends a sustainable guideline for long-term planning and also suggests that regular monitoring with time to time more detail qualitative and quantitative assessments of water bodies in the area.