Design and Application of Process for Energy-saving and Environmentally Friendly Automotive Painting
Zhang Tianpeng,
Huang Qing,
Wu Xiaosong,
Li Yongli,
Rong Guang
Issue:
Volume 11, Issue 5, October 2023
Pages:
116-121
Received:
1 August 2023
Accepted:
11 September 2023
Published:
27 September 2023
Abstract: The automotive industry has been developing for nearly a century, and the automotive manufacturing process has been gradually improved. In the process of automobile manufacturing, coating production is an indispensable part, but also the most energy-consuming production link. With the decreasing of ore energy, as well as the increasingly stringent requirements for environmental protection in various regions, the high energy consumption, non-environmental protection, low efficiency and other problems that exist in the current automotive body coating process are exposed more obviously, and a new coating process is needed to upgrade the original process. This paper reduces the emission of industrial waste water and waste gas by adopting new materials such as film pretreatment, "wet-on-wet" coating adhesive and high-solids coating, and at the same time optimises the coating on-line method, medium-free coating process and spraying method to improve the production efficiency and reduce the production cost. Through the use of new materials and new processes, a set of new automotive coating processes with low energy consumption and high efficiency has been designed and applied in automotive enterprises.
Abstract: The automotive industry has been developing for nearly a century, and the automotive manufacturing process has been gradually improved. In the process of automobile manufacturing, coating production is an indispensable part, but also the most energy-consuming production link. With the decreasing of ore energy, as well as the increasingly stringent ...
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Synthesis of Metallic Silver Supported by Metal Oxides (Fe2O3 and CoO) for the Removal of Methylene Blue in the Presence of Sunlight
Donourou Diabate,
Koffi Pierre Dit Adama N’goran,
Tano Patrice Fato,
N’Guessan Louis Berenger Kouassi
Issue:
Volume 11, Issue 5, October 2023
Pages:
122-129
Received:
2 August 2023
Accepted:
29 August 2023
Published:
9 October 2023
Abstract: The aim of this study was to evaluate and compare the effectiveness of the combination of silver nanoparticles (Ag NPs) and two metal oxides (Fe2O3 and CoO) for the removal of methylene blue (MB) molecules from aqueous solutions. To achieve this purpose, Silver (Ag) nanoparticles were successfully deposited onto metal oxides (Fe2O3 and CoO) nanocomposites, which were employed as adsorbents and photocatalysts. The prepared photocatalysts (Ag/Fe2O3 and Ag/CoO) were used for the absorption of methylene blue, an organic pollutant. Various analytical techniques such as Field Emission Scanning Electron Microscope (FESEM), Energy Dispersive X-ray (EDX), and Powder X-ray diffraction (XRD) were used to characterize the prepared nanomaterials. The results of the energy dispersive X-ray analysis identified the presence of the elements (Ag, Fe, and Co) and their distribution on the surface of the material. The X-ray diffraction pattern also confirmed the formation of nanocomposites (Ag/Fe2O3 and Ag/CoO). The degradation of MB in the presence of sunlight ratified that the nanocomposites (Ag/Fe2O3 and Ag/CoO) had weak photocatalytic absorption efficiency controlled by pseudo-second order kinetic model. Comparing both nanocomposites, the nanocomposite (Ag/Fe2O3) showed the best photocatalytic performance with a percentage of 56% within 3h. The results of the photocatalytic experiments indicated that the introduction of Ag into the metal oxides limited the charge recombination process between the photogenerated electrons/holes and thus facilitated the absorption of methylene blue.
Abstract: The aim of this study was to evaluate and compare the effectiveness of the combination of silver nanoparticles (Ag NPs) and two metal oxides (Fe2O3 and CoO) for the removal of methylene blue (MB) molecules from aqueous solutions. To achieve this purpose, Silver (Ag) nanoparticles were successfully deposited onto metal oxides (Fe2O3 and CoO) nanocom...
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Research Article
Dissolution of Trace Metal Elements in Water by Permeation: The Case of the Drinking Water Network of the City of Bangui in the Central African Republic
Eric Foto,
Oscar Allahdin,
Olga Biteman,
Nicole Poumaye
Issue:
Volume 11, Issue 5, October 2023
Pages:
130-136
Received:
24 September 2023
Accepted:
10 October 2023
Published:
28 October 2023
Abstract: Assessment heavy metal concentrations is particularly important, given their toxicity and capacity to bioaccumulate along food chains. Unlike organic pollutants, metals cannot be biologically or chemically degraded. The aim of this study is to characterize the spatio-temporal variation in contamination by trace metal elements (TMEs), in particular Zn, Fe, Cu, Pb, Cd, Cr, Hg and Ni, in public water supplies in the city of Bangui, Central African Republic. Thirteen sampling points were selected on the production company's distribution network to determine the water's physico-chemical parameters and assess the level of trace metal contamination. The results obtained established the following quantitative order: Pb (0,002 – 0,07 ppm) > Fe (0,03 – 0,597 ppm) > Ni (0,001 – 0,036 ppm) > Cu (0,01 – 0,06 ppm) > Zn (0,001 – 0,438 ppm) > Cd = Cr = Hg = 0 ppm, lead levels are 7 times higher than WHO standards, while iron levels are two to three times normal. Contamination is influenced by the physico-chemical conditions of the environment. Indeed, the alkaline pH of the water and the rise in temperature during the dry season have favored the precipitation of TMEs from the materials used to manufacture the network's pipes, and their release into the water through permeation phenomena.
Abstract: Assessment heavy metal concentrations is particularly important, given their toxicity and capacity to bioaccumulate along food chains. Unlike organic pollutants, metals cannot be biologically or chemically degraded. The aim of this study is to characterize the spatio-temporal variation in contamination by trace metal elements (TMEs), in particular ...
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