Tetracycline Rapid Test (Honey)

The integration of metal nanoparticles into carbon materials has catch considerable attention. In this study, we have successfully fabricated the N-doped porous carbon encapsulated magnetic Co nanoparticles (Co@NC-800) through a two-step pyrosis of zeolitic imidazolate frameworks (ZIF-67). The obtained Co@NC-800 exhibited excellent stability in activating peroxymonosulfate (PMS) towards tetracycline (TC) degradation without obvious Co leaching and magnetically separable. The removal efficiency reached up to 90.1% within 3 min and 74.7% of total organic carbon (TOC) removal efficiency could be obtained in 30 min towards TC by Co@NC800/PMS system. Mechanism explorations revealed the encapsulated Co nanoparticles in the porous N-doped carbon promoted the catalytic activity and stability. The two-pathway mechanism study indicated that radical and non-radical oxidations acted together in TC degradation. Moreover, some potential factors, including PMS dosage, TC concentration, solution pH value, anion/organic matters and temperature were investigated. The Co@NC-800/PMS system exhibited high efficiency in removal of various antibiotics (oxytetracycline, chlortetracycline and deoxytetracycline). Even in actual water bodies (tap water, river water and pharmaceutical wastewater), the Co@NC-800/PMS system displayed excellent performance. This study proposed a design of metal nanoparticles under confinement for fabricating highly active catalysts towards PMS activation.

A novel adsorbent derived from grapefruit peel (GP) based biochar (GPBC) was synthesized by combined carbonization of GP and subsequent activation by GP extracts. Compared to biochar without extracts activation, the technique granted GPBC-20 (with 1:20 of solid-solution ratio) more abundant surface functional groups, which exerts the adsorbent superior performance for tetracycline (TC) adsorption (37.92 mg/g v.s. 16.64 mg/g). The adsorption kinetics, isotherms and thermodynamics models were further used to evaluate the adsorption behavior of GPBC. The enhanced adsorption was analyzed by characterization of fresh and used GPBC, revealing that the adsorption mechanism was comprised of pore filling, charge interaction and chemical bonding. The comprehensive investigation of using agricultural waste extracts as activator to prepare its raw materials-based adsorbents may be of great significance for enhanced resource utilization.