| Inspired by natural creatures in recent years,superhydrophobic and superamphiphobic coatings have attract ed much attention due to their special properties.It has widely applied in areas such as self-cleaning,anti-icing,anti-corrosion,drag reduction,and oil-water separation,which promotes the rapid development of coating preparation technologies such as chemical deposition,etching,and electrospanning.However,these preparation methods have the disadvantages of complicated preparation process,high cost,and incapability of large-area preparation.In order to solve the above problems,this paper aims to solve the problem of the recycling and reuse of spent bleaching earth(SBE)with constructing a superhydrophobic/superamphiphobic coating with excellent performance.SBE is a waste clay which is decolorized and adsorbed on vegetable oil by attapulgite(APT)as a decolorizer.The SBE treatment method is generally buried or fueled mixed with coal.Such a treatment method is not only a waste of APT resources but also causes secondary pollution to the environment.In recent years,research teams have used SBE as a decoloring agent after high-temperature calcination treatment,which also provides scientific basis for the study of this article.APT has a natural microscopic structure,the main component of SBE is also APT,which includes a certain amount of carbon-containing organic substances such as oils,vitamins,and fats.Therefore,in this paper,SBE is carbonized to obtain attapulgite/carbon composites(APT/C).This material has a micro-nano structure,that is,carbon nanoparticles are loaded on the surface of APT.Therefore,it can be used to construct superhydrophobic/superamphiphobic coatings.It is an ideal framework material.The APT/C composite was dispersed in ethanol solution and surface modified with hexadecyltrimethoxysilane(HTDMS)under the catal ysis of ammonia water.HTDMS formed polysiloxane on the surface of APT/C composite material after 2 h reaction,APT/C@POS suspension was obtained.The suspension was sprayed to prepare a superhydrophobic coating.The superhydrophobic coating shows a high water contact angle(163.7°)and a very low roll angle(1.2°)with high mechanical,thermal and chemical stability at the same time.This is because APT/C composites are tightly joined together by POS to form a highly crosslinked network structure.This provides the basis for SBE's value-added recycling and preparation of cost-effective bionic anti-wetting coatings.Compared with the preparation of superhydrophobic coatings,the preparation conditions of the superamphiphobic coating are more severe.Based on the preparation method of the above-mentioned hydrophobic coating,the surface roughness was constructed in the same manner,and the surface was modified by selecting a low surface energy perfluorosilyltriethoxysilane(PFDTES).A uniform suspension of APT/C composite material modified by hydrolytic condensation of tetraethylorthosilicate(TEOS)and PFDTES was sprayed on a glass plate to obtain a superamphiphobic coating.The contact angle and roll angle of the coating to n-decane are 154.2° and 11.3°,respectively,and also the coatings shows good chemical and thermal stability.APT/C composites,carbon nanoparticles and fluoropolysiloxanes(fluoro POS)have been newly constructed to create a three-dimensional micro-nano-nanometer structure,which plays a key role in the construction of superamphiphobic coating.The cross-linking of APT/C composites with fluoro POS packages significantly improved the coating stability.SBE was used as raw material to obtain APT/C composite material through carbonization,and further to obtain excellent superhydrophobic/superamphiphobic coating.This method obtains new micro-nano materials at the same time as waste recycling and reuse,and also reduces the preparation cost of superhydrophobic/superamphiphobic coating,and ha s the potential for commercial production.Therefore,to a certain extent,this paper provides a new idea for the recycling of decolorized waste soil and the preparation of ultra-wetting materials. |
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