The water pollution derived from the discharge of heavy metals,antibiotics,dyes and surfactants wastewater,*** seriously affected human survival and ecological *** an efficient and low-cost physical wastewater treatme...
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The water pollution derived from the discharge of heavy metals,antibiotics,dyes and surfactants wastewater,*** seriously affected human survival and ecological *** an efficient and low-cost physical wastewater treatment process,the adsorption is a continuous hot spot in related scientific research and *** are non-crystal or semi-crystalline materials with high-efficiency adsorption performance due to the alkali metal ions that balance the electronegative aluminosilicate skeleton can be efficiently replaced by other cations in the aqueous *** related studies of different application conditions,service objects and morphological differences of geopolymer adsorbents based on structure-function design have been in-depth exploration and *** review aims to summarize the research progres s of the structure-function design based on the geopolymerization mechanism and kinetics and service *** overview of service characteristics and progress of geopolymers in the wastewater treatment field(e.g.,dyes,heavy metals,radionuclides,surfactants,antibiotics,ammonium,phosphorus,nitrogen and CO_(2),etc.)are systematically *** the evolution and development of morphological differences and the relationship of structure-function design of geopolymer adsorbents were compared and ***,the challenge worth overcoming,the trends worth considering and perspectives worth developing are highlighted.
作者：
Tian, JingweiLi, ChenggaoXian, GuijunMinist Educ
Harbin Inst Technol Key Lab Struct Dynam Behav & Control Harbin 150090 Heilongjiang Peoples R China Harbin Inst Technol
Minist Ind & Informat Technol Key Lab Smart Prevent & Mitigat Civil Engn Disaste Harbin 150090 Peoples R China Harbin Inst Technol
Sch Civil Engn Harbin 150090 Heilongjiang Peoples R China 73 Huanghe Rd
Harbin 150090 Peoples R China
Lotus-like superhydrophobic coatings play an essential role for the corrosion protection of steel substrates exposed to harsh environments. Thus, improving the mechanical robustness and corrosion resistance of superhy...
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Lotus-like superhydrophobic coatings play an essential role for the corrosion protection of steel substrates exposed to harsh environments. Thus, improving the mechanical robustness and corrosion resistance of superhydrophobic coatings through macroscopic material matching and microscopic structure manipulation is an important task. In this study, a layered superhydrophobic coating with a "1 + 1" structural mode was successfully prepared using the spinning and spraying techniques. In order to prevent the interface debonding of upper and lower layers, the epoxy resin was introduced as bonding transition zones, and its three-dimensional cross-linking characteristic was used to realize the super stable "welding". Then, the structure-function design, surface wetting behavior, mechanical robustness and corrosion resistance were systematically investigated. The results showed that the superhydrophobic coating was successfully constructed by designing micro-/nano-scale hierarchical structure and reducing surface energy, achieving a desirable static contact angle of 172.5 degrees and a roll-off angle of 3.4 degrees. Through high-pressure water anti-jetting, high-height sand impacting, and loaded sandpaper shear abrasion tests, the as-prepared coating still showed obvious superhydrophobicity and the shapes of water droplets on the coating surface continued to be nearly spherical. After immersion in 5 wt% NaCl solution for 28 days, an increase of polarization current density was negligible (similar to 0.0035 mu A/cm(2)), and the impedance values (10(7) ***(2)) of the superhydrophobic coating were approximately three orders of magnitude higher than the control coating in the low-frequency region. This was because the corrosive species (H2O and Cl-) were restricted from entering the coating interior owing to the extreme water-repellence. In addition, the electron-carrying capacity of the superhydrophobic coating was vastly weakened, which impeded the formation of the corro
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