Microwave-Assisted Preparation of Activated Carbon Modified by Zinc Chloride as a Packing Material for Column Separation of Saccharides

Abstract

Activated carbon, an amorphous carbon material with a high specific surface area and void fraction, is widely used as an economical adsorbent in many fields. In this work, a kind of new activated carbon composite for saccharide column separation was prepared by zinc chloride impregnating and microwave heating. The structural characterizations validate the increase in porosity and the specific surface area of the activated carbon as well as the change of the activated carbon crystallite lattice. The chemical characterizations validate the increase in the number of oxygen-containing functional groups and structural bonding of zinc with the activated carbon surface. Compared with the blank control, the surface Zn element improves the adsorption selectivity of the activated carbon to the target saccharides. Under the special mechanism of microwaves, the pores created by expansion from the inside to the outside facilitate the free flow of the mobile phase. The eight saccharides can be separated by the columns packed with the activated carbon impregnated with 40% and 70% zinc chloride.

Research of saccharides and related biocomplexes: A review with recent techniques and applications

“…Reversed-phase LC LC enables fingerprinting of glycosides, phenols, plant triterpenes, steroids, oligosaccharides, polysaccharides, metabolites of flavonoids, glycans, and antibodies. In RP-LC aqueous buffer solutions are used in combination with either methanol (Table S1, [120,126]) or acetonitrile (Table S1, [2,37,80,103,104,106,109,111,113,114,118,123,137,138,140,143]). The combination of the non-polar column with aqueous NaOH (high pH, high I) is still popular for RPLC-RID of ionized saccharides.…”

“…The basic hydrophilic saccharides have no charges, although they are ionized in an alkaline water environment. The differences in their anomeric structures complicate their analytical separation, sample preparation, and purification [1–5]. Case‐selective method validation is needed for the identification and characterization of their functionalities and exact structures.…”

Microwave Synthesis of Carbon Quantum Dots from Arabica Coffee Ground for Fluorescence Detection of Fe3+, Pb2+, and Cr3+

“…The synthesis required only 10 min under microwave radiation without sample pretreatment, resulting in an economized and green synthesis of CQDs. The microwave technique is considered the most straightforward method that is frequently used to fabricate quantum dots. ,− The microwave method of synthesizing CQDs involves microwave radiation to irradiate a solution containing targeted precursors to produce nanoparticles. This method has become increasingly popular as it is a fast and efficient way to synthesize CQDs compared to other methods, such as chemical reduction and hydrothermal synthesis. , The microwave method can reduce synthesis times from several hours to a few minutes, ensuring a more cost-effective and scalable approach in CQD synthesis.…”

Simultaneous removal of anionic and cationic dyes from wastewater with biosorbents from banana peels

“…The physical activation is usually performed with pyrolysis, where the material is heated over the temperature range of 400-1100 C, under the continuous flow of gases, such as N 2 , [17] CO 2 , [18] steam, [19] or mixture of them. [20] During the chemical activation, the adsorbents are treated with various chemical agents such as acids (H 3 PO 4 , [21] H 2 SO 4 , [22] and HNO 3 [23] ), alkaline salts (KOH [24] and NaOH [25] ), and metal salts (ZnCl 2 [26] and K 2 CO 3 [27] ). [28] The combination of the two processes is usually the most efficient treatment method to produce ACs.…”