Copper-doped orange peel biochar activated peroxydisulfate for efficient degrading tetracycline: The critical role of C-OH and Cu.

The usage of biomass waste has aroused great concern in water purification. In this study, copper-doped orange peel biochar (Cu-OPB) prepared by one-step carbonization was firstly used to activate peroxydisulfate (PDS) to eliminate tetracycline (TC). The optimized Cu-OPB showed great activation ability for PDS and could degrade 93.

Highly efficient adsorption of ciprofloxacin from aqueous solutions by waste cation exchange resin-based activated carbons: Performance, mechanism, and theoretical calculation.

This study focused on the preparation of a highly efficient activated carbon adsorbent from waste cation exchange resins through one-step carbonization to remove ciprofloxacin (CIP) from aqueous solutions. Scanning electron microscopy, X-ray diffraction, Fourier-transform infrared spectrometry, and X-ray photoelectron spectroscopy were used to characterize the physicochemical properties of the carbonized materials. The CIP removal efficiency, influencing factors, and adsorption mechanisms of CIP on the carbonized resins were investigated.

Preparative separation of flavonoids in plant extract of Smilacis Glabrae Roxb. by high performance counter-current chromatography.

Four flavonoids, isoastilbin, astilbin, isoengelitin, and engelitin were isolated and purified simultaneously from Smilacis Glabrae Roxb. for the first time by high performance counter-current chromatography using a system consisting of n-hexane-n-butanol-water (1:2:3, v/v/v). A total of 392.

Preparative separation of chromones in plant extract of Saposhnikovia divaricata by high-performance counter-current chromatography.

Four chromones, prim-O-glucosylcimifugin, 4'-O-β-D-glucosyl-5-O-methylvisamminol, cimifugin and sec-O-glucosylhamaudol, were isolated and purified from Saposhnikovia divaricata for the first time by high-performance counter-current chromatography (HPCCC) using a system consisting of ethyl acetate/n-butanol/ethanol/water (1:1:0.1:2, v/v/v/v). The separation parameters were first performed on the analytical HPCCC and the optimized conditions were then scaled up to preparative HPCCC.