a] 3-(Trimethoxysilyl)-1-propanamine (APTMS) modified glass fiber membrane (APTMS-GF) was prepared via chemical bonding with different volume ratios (APTMS : methanol = 1:20, 1:10, 1:5), which was called APTMS-GF-1, À 2 and À 3, respectively. For congo red (CR) with the concentrations ranging from 5 to 45 mg L À 1 , the removal efficiencies were up to above 95% by filtration with APTMS-GF composite membranes, but there was no distinct difference in removal capacity with increasing the volume ratio of APTMS. More importantly, on account of the electrostatic interaction, APTMS-GF composite membrane could selectively separate and recycle neutral bromophenol blue (BPB), cationic methylene blue (MB) and anionic methyl orange (MO) from binary systems including BPB/CR, MB/CR, and MO/CR, respectively. Under the static adsorption, the adsorption process of CR on the APTMS-GF composite membrane was better fitting with the pseudo-second-order kinetic model (R 2 = 0.992) due to the electrostatic interaction, which was confirmed by the effects of inorganic ions and pH in solution. The structural advantage of glass fiber membrane with micropores made all of filtration fulfilled under atmospheric pressure in comparison to the reported membranes. As a result, this work provides a feasible method for fabricating the economic membrane in removing dyes.[a] J.
Although carbon fibers (CFs) are born with special physicochemical properties, the common CFs show the poor adsorption performance owing to the lack of adsorption sites and porosity with low specific surface area. As emerging functional materials, metal-organic frameworks (MOFs) have attracted significant attention due to excellent properties, which has the ability of remedying drawbacks of other materials. In this study, zeolitic imidazolate framework-8 (ZIF-8) was rapidly coated on the surface of carbon fibers (CFs) (CF/ZIF-8) via in-situ selfassembly approach in 10 min. The scanning electron microscope (SEM) images show ZIF-8 film on CF is dense and homogeneous due to the low reactivity of zinc acetate and the coordination interaction between Zn 2 + and carboxyl of CF treated by nitric acid (CF-COOH). The Brunauer-Emmett-Teller (BET) surface area of CF/ZIF-8 composite is about 30 times larger than that of pristine CF. The adsorption selectivity of CFs was increased after the modification of ZIF-8 demonstrating by adsorbing different dyes. The CF/ZIF-8 composites were applied to remove congo red (CR) from aqueous solutions with the adsorption capacity 40 times more than that of pristine CF and CF-COOH, because of the increasing specific surface, electrostatic interaction and π-π interaction between ZIF-8 and CR molecule. The MOFs/CFs composites we fabricated also have great promise applications in micro-preconcentration and electrochemistry.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.