Utilization of Waste Amine-Oxime (WAO) Resin to Generate Carbon by Microwave and Its Removal of Pb(II) in Water

Abstract

Utilising waste amine-oxime (WAO) resin through microwave semi-carbonization, a carbon adsorbent (CA) was obtained to remove Pb(II). After microwave treatment, the pore size of the skeleton structure, three-dimensional porous network, and lamellar pore structure of WAO was improved. The distribution coefficient (Kd) of Pb(II) onto CA is 620 mL/g, and the maximum adsorption capacity of Pb(II) is 80.0 mg/g after 20 min of WAO microwave treatment. The adsorption kinetics and adsorption isotherms conform to the quasi-second-order kinetic equation and Langmuir adsorption isotherm model, respectively. The adsorption mechanism involves ion exchange between H in the C-OH bond of resin and Pb(II). Pb(II) elution in hydrochloric acid solution is more than 98%, and its recovery is high at 318 K and for 1 h.

Novel Adsorbents and Adsorption Methods for Pollutant Removal

“…The advection and dispersion of tritiated water and pollutants such as iodine species (iodide: I − and iodate: IO 3 − ) and plutonium in deep geological repositories were studied in two respective articles [ 11 , 12 ]. In order to study the purification and detection technology of heavy metals in water, Dengpeng Wang, Chunlin He, and Yuling Zhao et al [ 13 , 14 , 15 ] discussed CdSe/CdS core–shell quantum dot tracing Cd 2+ in aqueous solutions, carbon adsorbent microwaves with waste amine–oxime removing Pb(II), and advanced Fe 3 O 4 @SFBC adsorbent removing As(III/V), respectively. Based on waste ore, two articles [ 16 ] studied the rational recovery process of radionuclides in tantalum–niobium slag and the adsorption effect of discarded coal gangue on the pollutant tetracycline hydrochloride, which reflected the important idea of turning waste into treasure.…”