Removal of Ciprofloxacin from Water by a Potassium Carbonate-Activated Sycamore Floc-Based Carbonaceous Adsorbent: Adsorption Behavior and Mechanism

Abstract

In this study, a porous carbonaceous adsorbent was prepared from sycamore flocs by pyrolysis method and K2CO3 activation. The effects of preparative conditions of the material on its adsorptive property were explored. The optimal material (SFB2‑900) was obtained with a K2CO3/biochar mass ratio of 2:1 at an activation temperature of 900 °C, possessing a huge surface specific area (1651.27 m2/g). The largest adsorption capacity for ciprofloxacin on SFB2‑900 was up to 430.25 mg/g. The adsorption behavior was well described by the pseudo-second-order kinetic model and the Langmuir isothermal model. Meanwhile, this process was spontaneous and exothermic. The obtained material showed excellent adsorption performance in the conditions of diverse pH range, ionic strength, and water quality of the solution. The optimum adsorption conditions (pH = 7.01, dosage = 0.6 g/L, and C 0 = 52.94 mg/L) determined based on the response surface methodology were in accordance with the practical validation consequences. The good regeneration effect of SFB2‑900 manifested that this material had great practical application potential. Combining the experimental results and density functional theory calculation results, the adsorption mechanisms mainly included pore filling, π–π EDA interactions, electrostatic interactions, and H-bonds. The material could be regarded as a novel and high-efficiency adsorbent for antibiotics. Additionally, these findings also provide reference for the reuse of waste biomass in water treatment.

Insights into the Roles of Surface Functional Groups and Micropores in the Sorption of Ofloxacin on Banana Pseudo-Stem Biochars

“…Howe tion of KHCO3 did not significantly affect the sorption of OFL on WBS5. A p also indicated that the hydrolysis of carbonate slats could produce a large a in the solution [63], thereby inhibiting the ciprofloxacin sorption. These gested that the co-existing K + did not significantly affect OFL sorption on while HCO3 − may increase the solution pH, and thus decrease the OFL sorp The impact of ions on FQs has been previously discussed.…”

Underwater Superoleophobic and Underoil Superhydrophilic Copper Benzene-1,3,5-tricarboxylate (HKUST-1) Mesh for Self-Cleaning and On-Demand Emulsion Separation

“…Oil spills in the ocean and oil cleanup have turned into a pressing environmental issue . The separation procedure may be more challenging due to the presence of emulsified oil, water-soluble dyes, insoluble oil, and oil-soluble colors in the effluent. − As a result, creating an emulsion separation surface is now a pressing concern in this field of study. However, the majority of conventional techniques for separation are ineffective. , Nature has demonstrated extraordinary design skills for biomaterials with unique wettability during millions of years of evolution by meticulously regulating the surface’s chemical composition and geometrical structure. − Due to the fast development of special wettability surfaces, biomimetic materials with super-wettability have recently shown tremendous potential for emulsion separation. − The formation of super-wettability is significantly influenced by the inherent contact angles of oil (θ O ) and water (θ W ) .…”