Facile Surface Modification of Glass‐Fiber Membrane with Silylating Reagent through Chemical Bonding for the Selective Separation and Recycling of Diverse Dyes from Aqueous Solutions

Abstract

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.

Recent Progress in Modifications, Properties, and Practical Applications of Glass Fiber

“…GF was immersed in APTES (NH 2 (CH 2 ) 3 –Si(OCH 2 CH 3 ) 3 ) organic solution to fully hydrolyze APTES, as shown in ( Figure 3 B), forming APTES-modified GF [ 69 , 70 ]. Similarly, Li et al modified a GF membrane (GFM) with 3-(trimethoxy-methylsilyl)-1-propylamine (NH 2 (CH 2 ) 3 –Si(OCH 3 ) 3 , APTMS) to obtain APTMS-modified GF [ 64 ].…”

“…Thomason reported that by modifying the GF surface with a silane coupling agent, a crosslinking layer formed on the GF surface, which appeared as “islands” instead of a continuous layer on the GF surface, resulting in an uneven structure ( Figure 3 C). Thus, the specific surface area increased [ 64 , 65 , 143 ]. Tomao soaked GF in 20% hydrochloric acid solution and studied the influence of the treatment time (4, 6, and 8 h) and temperature (40, 60, 80, and 100 °C) on the surface hydroxyl density on the GF.…”

“…Li et al used an APTMS–GF composite membrane to selectively remove and separate the dyes Congo red (CR), bromophenol blue (BPB), methylene blue (MB), and methyl orange (MO) from binary solutions ( Figure 12 D). Based on electrostatic interaction, the APTPS–GF composite membrane (–NH 2+ ) selectively removed CR (anionic dye) from mixed solutions of BPB/CR, MB/CR, and MO/CR, separating BPB (neutral dye), MB (cationic dye), and MO (weak anionic dye), respectively ( Figure 12 C) [ 64 ]. Zhang et al prepared a glass hollow-fiber membrane with an asymmetric nanopore structure by phase conversion, sintering, and acid leaching, which was used for the removal of MB dye ( Figure 20 A).…”