Role of non‐ion surfactants in three‐dimensional ordered porous biomass carbon foam derived from the liquefied eucalyptus sawdust for metronidazole adsorption

Abstract

BACKGROUND Three‐dimensional ordered honeycomb‐like structured biomass carbon foams (BCFs) were prepared from eucalyptus sawdust using polyethylene glycol 2000 (PEG), Pluronic® P‐123 and Pluronic® F‐127 as structure‐directing agents. The effect of different surfactants on the morphology and pore structure of BCFs, and the adsorption performance and mechanisms of metronidazole onto BCFs was clarified. RESULTS The physicochemical characteristics of BCFs depend on the surfactant molecular structure. The adsorption process of metronidazole was spontaneous and endothermic in nature and followed a pseudo‐second‐order kinetic model. Metronidazole adsorption onto BCF‐PEG and BCF‐F127 followed the Langmuir isotherm, whereas that onto BCF‐P123 followed the Freundlich isotherm. The maximum adsorption capacities for BCF‐PEG, BCF‐P123 and BCF‐F127 were 56.40, 67.52 and 42.92 mg g−1, respectively. The adsorption mechanisms of metronidazole onto BCF‐PEG and BCF‐P123 were mainly hydrogen bonding, π‐π interactions and pore filling. Hydrogen bonding and π–π interactions were mainly responsible for adsorption of metronidazole onto BCF‐F127. CONCLUSION All results demonstrated that types of surfactant significantly affected the BCFs' physicochemical properties, and played an important role in controlling the adsorption characteristics of metronidazole onto BCFs. In addition, shaped BCF can be utilized as an effective, easily recovered and promising adsorbent for the removal of pollutants in wastewater. © 2018 Society of Chemical Industry

Surface Treatment of Biochar: Methods, Surface Analysis and Potential Applications. A Comprehensive Review

“…The antibiotic exhibited the greatest affinity for the surface of the adsorbent modified with PEG 2000 (removal 100 %) whereas its adsorbed amount was the smallest on the surface of the Pluronic F-127-modified biochar (removal 80 %). 57 Table 3 summarizes the experimental conditions for the design and salient features of surfactant-modified biochar specimens, whereas Figure 9 presents the possible applications of surfactant-modified biochars. Metronidazole adsorption…”

Surface Treatment of Biochar—Methods, Surface Analysis and Potential Applications: A Comprehensive Review

“…All the above surfactants had an impact on metronidazole adsorption. The antibiotic exhibited the greatest affinity for the surface of the adsorbent modified with PEG 2000 (removal 100%), whereas its adsorbed amount was the smallest on the surface of the Pluronic F-127-modified biochar (removal 80%) [77].…”

Coadsorption of gaseous xylene, ethyl acetate and water onto porous biomass carbon foam pellets derived from liquefied Vallisneria natans waste

“…Compared with powdered biochar, biomass carbon foam prepared from renewable waste biomass can be potentially applied in the field of pollutant removal because of the latter's low cost, efficiency and easy recovery of adsorbent. In previous studies, we prepared three types of shaped biomass carbon foam with an ordered porous structure from eucalyptus sawdust waste . We further prepared self‐shaping lightweight porous biomass carbon foam pellets (BCFPs) using Vallisneria natans waste as precursor by simplifying the preparation process of the biomass carbon foam .…”

“…In previous studies, we prepared three types of shaped biomass carbon foam with an ordered porous structure from eucalyptus sawdust waste. 20 We further prepared self-shaping lightweight porous biomass carbon foam pellets (BCFPs) using Vallisneria natans waste as precursor by simplifying the preparation process of the biomass carbon foam. 21 BCFPs can be rapidly isolated from aqueous solutions, and their adsorption capacities for typical antibiotics metronidazole and dimetridazole are 64.23 and 82.58 mg g −1 respectively.…”