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A metal-OH group modification strategy to prepare highly-hydrophobic MIL-53-Al for efficient acetone capture under humid conditions

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Journal of Environmental Sciences 2021年第9期33卷 111-123页

作者： Jiaqi Shi Rui Han Shuangchun Lu Qingling Liu Tianjin Key Lab of Indoor Air Environmental Quality Control School of Environmental Science and TechnologyTianjin UniversityTianjin 300350China State Key Laboratory of Engines Tianjin UniversityTianjin 300350China

A series of highly-hydrophobic MIL-53-Al(MIL = Materials of Institut Lavoisier) frameworks synthesized via decoration of the Al-OH groups by alkyl phosphonic acid were developed as adsorbents for removing acetone from humid gas *** newly prepared materials were characterized by X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), scanning electron microscope(SEM), N_(2) adsorption-desorption and thermogravimetric analysis(TGA).Their adsorption behaviors toward acetone vapor under dry and wet conditions were studied *** showed that alkyl phosphonic acid was successfully grafted into MIL-53-Al skeleton through coordinating interaction with Al3+generating MIL-53-Al@C_(x)(x = 12, 14, 18).The MIL-53-Al@C_(x) exhibited similar crystal structure and thermal stability to parent ***, the modified materials showed significantly enhanced *** water vapor uptake of MIL-53-Al@C_(14) decreased by 72.55%at 75% relative humidity(RH).Dynamic adsorption experiments demonstrated that water vapor had almost no effect on the acetone adsorption performance of MIL-53-Al@C_(14).Under the condition of 90% RH, the acetone adsorption capacity of MIL-53-Al@C_(14) was 102.98% higher than that of ***, MIL-53-Al@C_(14) presented excellent adsorption reversibility and regeneration performance in 10 adsorption-desorption *** together, the strategy of metal-OH group modification is an attractive way to improve the acetone adsorption performance over metal-organic frameworks(MOFs) under humid ***, MIL-53-Al@C_(14) would be deemed as a promising candidate for capturing acetone in high moisture environment.

关键词： hydrophobization Alkyl phosphonic acid Al-OH groups Adsorption Moisture

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Urethane Modified Hydrophobic Compact Wood Pulp Paper for Oil Spill Cleanup: A Preliminary Study

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Journal of Renewable Materials 2020年第10期8卷 1257-1268页

作者： Gustavo de Souza Ricardo K.Kramer Antonio J.F.Carvalho Department of Materials Engineering Sao Carlos School of Engineering(EESC)University of São Paulo(USP)São PauloBrazil

Oil spills and oil/water wastewater are among the great concerns regarding oil *** technologies face many limitations and in some cases are responsible for causing secondary pollution,therefore there is as seek for environmental friendly ***,from which celluloses are highlighted,are being employed for oil/water separation or oil absorbents ***,these membranes are obtained by freeze drying of CNF(cellulose nano-fibrils)suspensions followed by chemical modification for hydrophobization,which involves expensive process as chemical vapor deposition and expensive reactants as sylanes,turning these processes hardly ***,we produced a natural porous structure paper from eucalyptus pulp fibers modified by a dipping and heating process in a blocked diisocyanate *** the surface treatment,contact angle with water reached 144°and water absorption reduced seven times,keeping the good oil *** chemical modification process is simple to be performed and use a very low quantity of reactant estimated to be less than 0.1 wt%based on *** good mechanical properties of the material allows its use in non usual conditions which can be of great importance depending on the environmental conditions.

关键词： Cellulose oil removal hydrophobization water repellency blocked isocyanates

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Hydrophobic intensification flotation:Comparison of collector containing two minerophilic groups with conventional collectors

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Transactions of Nonferrous Metals Society of China 2020年第9期30卷 2536-2546页

作者： Sheng LIU Guang-yi LIU Yao-guo HUANG Hong ZHONG School of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

The surface hydrophobization and flotation of a xanthate−hydroxamate collector toward copper oxide mineral were compared with the combined collectors of xanthate and hydroxamate through water contact angle(WCA)and micro-flotation *** results showed that S-[(2-hydroxyamino)-2-oxoethyl]-O-octyl-dithiocarbonate ester(HAOODE)exhibited stronger hydrophobization and better flotation performance to malachite(Cu2(OH)2CO3)than octyl-hydroxamic acid(OHA)and its combination with S-allyl-O-ethyl xanthate ester(AEXE).To understand the hydrophobic intensification mechanism of HAOODE to malachite,zeta potential,atomic force microscopy(AFM)and XPS measurements were carried *** results recommended that malachite chemisorbed HAOODE to form Cu—HAOODE complexes in which the hydroxamate—(O,O)—Cu and—O—C(—S—Cu)—S—configurations *** co-adsorption of HAOODE’s hetero-difunctional groups was more stable than the single-functionalgroup adsorption of OHA and AEXE,which produced the“loop”structure and intensified the self-assembly alignment of HAOODE on malachite *** addition,the“h”shape steric orientation of the double hydrophobic groups in HAOODE facilitated stronger hydrophobization toward malachite than the“line”or“V”hydrophobic carbon chains of OHA or ***,HAOODE achieved the preferable flotation recovery of malachite particles in comparison with OHA and AEXE.

关键词： S-[(2-hydroxyamino)-2-oxoethyl]-O-octyl-dithiocarbonate ester atomic force microscopy(AFM) heterodifunctional co-adsorption hydrophobization malachite flotation

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