Preparation Of Modified Carbon Precursor Material And Its Adsorption Properties Towards Metal Ions

Carbon materials have exhibited its excellent adsorption properties towards metal ions, due to its unique properties of structure and surface. However, the studies of modifying the carbon precursor with different methods are less. Carbon materials are prepared by modification and the impacts of nitrogen-containing and oxygen-containing groups towards adsorption properties of the material, which with great significance.The precursor was prepared through crosslinking, using polyvinyl alcohol and glutaraldehyde with oxygen-containing group. Then, the material C(PVA-GA)700 with oxygen-containing was obtained after carbonizing the precursor under 700?. The precursor was prepared through reactions of N,N-methylene-bis-acrylamide with nitrogen-containing group and carboxymethyl cellulose, methacrylate. Then, C(CMC-MAA)700 which with oxygen-containing and a few nitrogen-containing groups was obtained after carbonizing the precursor under 700?. The precursor was prepared through grafting methacrylate to the surface of the resin melamine-urea-formaldehyde. Then, the carbonized PMAA-g-MUF material which with oxygen-containing and riched in nitrogen-containing group was obtained after carbonizing the precursor under 250?.The materials above were characterizated by multiple techniques, sucn as infrared spectroscopy(FT-IR) and scanning electron microscopy(SEM). The impacts of nitrogen-containing and oxygen-containing groups of material towards its adsorption properties towards metal ions. The adsorption results towards Cu2+ of modified material showed that the adsorption capacities of modified materials towards Cu2+ increase with nitrogen-containing group increases; their adsorption kineticses conform to pseudo-second kinetic equation, and their adsorption capacities increase substantially with the pH and temperature increase, and the main adsorption is via chemical adsorption. At pH 4.5 and 25?, C(PVA-GA)700, the adsorption capacities of C(CMC-MAA)700 and carbonized PMAA-g-MUF material towards Cu2+ can reach up to 16.5 mg·g-1, 24.5 mg·g-1 and 28.4mg·g-1, respectively.Since the presence of nitrogen-containing and oxygen-containing groups at the same, the material has some chelation. C(CMC-MAA)700 and carbonized PMAA-g-MUF material can be used to the adsorption of rare earth ions. The results showed that the materials had adsorption towards La3+; and their adsorption capacities towards La3+ can reach to 13.5 mg·g-1 and 21.1mg·g-1, respectively.Sunflower disk has oxygen-containing and nitrogen-containing groups, according to the existing research results in our group. The material 750KH-1:1KOH can be obtained after carbonizing under 750?, and adsorption capacitiy towards Al3+ can reach to 12.5 mg·g-1. The statistics show that the nitrogen content of the material reduces with the carbonization temperatures increase. The material CKP-C600-1:1.0 was obtained after modifying the sunflower disk and carbonizing at 600?.The carbonization temperature of CKP-C600-1:1.0 was lower and the nitrogen-containing group was more, its adsorption capacity towards Al3+ was increase, in comparison. Under the same adsorption conditions, adsorption capacity of CKP-C600-1:1.0 towards Al3+ can reach up to 35.5 mg·g-1, increased 23.0 mg·g-1.