Co-transport and retention of zwitterionic ciprofloxacin with nano-biochar in saturated porous media: Impact of oxidized aging

Zhu, Shishu; Zhao, Weigao; Wang, Pan; Zhao, Lingan; Jin, Chao; Qiu, Rongliang

doi:10.1016/j.scitotenv.2021.146417

Cited by 25 publications

(7 citation statements)

References 49 publications

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“…The surface charges of both CIP and ZnO/Bentonite play important roles in the degradation of PhACs under various pH. CIP exhibits various surface charge states, including cationic (pH < 5.9), zwitterionic (5.9 < pH < 8.9), and anionic (pH > 8.9) [ 37 , 38 ]. At pH 10, the electrostatic repulsion between the negative surface charges of both CIP and ZnO/Bentonite hampered the adsorption of CIP onto the surface of ZnO/Bentonite, which resulted in a decrease in the removal efficiency of the system for this PhAC.…”

Section: Resultsmentioning

confidence: 99%

ZnO/γ-Fe2O3/Bentonite: An Efficient Solar-Light Active Magnetic Photocatalyst for the Degradation of Pharmaceutical Active Compounds

et al. 2022

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For applications related to the photocatalytic degradation of environmental contaminants, engineered nanomaterials (ENMs) must demonstrate not only a high photocatalytic potential, but also a low tendency to agglomeration, along with the ability to be easily collected after use. In this manuscript, a two-step process was implemented for the synthesis of ZnO, ZnO/Bentonite and the magnetic ZnO/γ-Fe2O3/Bentonite nanocomposite. The synthesized materials were characterized using various techniques, and their performance in the degradation of pharmaceutical active compounds (PhACs), including ciprofloxacin (CIP), sulfamethoxazole (SMX), and carbamazepine (CBZ) was evaluated under various operating conditions, namely the type and dosage of the applied materials, pH, concentration of pollutants, and their appearance form in the medium (i.e., as a single pollutant or as a mixture of PhACs). Among the materials studied, ZnO/Bentonite presented the best performance and resulted in the removal of ~95% of CIP (5 mg/L) in 30 min, at room temperature, near-neutral pH (6.5), ZnO/Bentonite dosage of 0.5 g/L, and under solar light irradiation. The composite also showed a high degree of efficiency for the simultaneous removal of CIP (~98%, 5 mg/L) and SMX (~97%, 5 mg/L) within 30 min, while a low degradation of ~5% was observed for CBZ (5 mg/L) in a mixture of the three PhACs. Furthermore, mechanistic studies using different types of scavengers revealed the formation of active oxidative species responsible for the degradation of CIP in the photocatalytic system studied with the contribution of h+ (67%), OH (18%), and ·O2− (10%), and in which holes (h+) were found to be the dominant oxidative species.

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Section: Resultsmentioning

confidence: 99%

ZnO/γ-Fe2O3/Bentonite: An Efficient Solar-Light Active Magnetic Photocatalyst for the Degradation of Pharmaceutical Active Compounds

et al. 2022

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“…Furthermore, DBC can coordinate with heavy metals via complexation (Stubbins et al, 2010;Wu et al, 2011;Xia et al, 1997). Moreover, as DBC is defined as the watersoluble fraction of < 0.45 μm, it may exert some overlap with the definition of nano BC (< 1 μm) (Liu et al, 2018;Song et al, 2019) and holds pollutants well (Ramezanzadeh et al, 2021;Zhu et al, 2021). Tang et al (2016) demonstrated that hydrophobic interactions were the main interaction mechanisms between DBC and polycyclic aromatic hydrocarbons (PAHs).…”

Section: Interaction Between Dbc and Pollutantsmentioning

confidence: 99%

Analytical methods, molecular structures and biogeochemical behaviors of dissolved black carbon

et al. 2022

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Dissolved black carbon (DBC) is one of the most active fractions in the black carbon (BC) continuum and plays a significant role in the global dissolved organic matter (DOM) pool. Connecting the BC pool between territorial and marine environments, the biogeochemical processes of DBC are significant for many aspects of aquatic chemistry. Once entering the aquatic environment, DBC will undergo degradation and exert continuing effects on water ecology. DBC can change the migration and transport of pollutants and affect associated microbial communities. Therefore, the knowledge of the fate and transport of DBC is of great importance. In this work, the molecular structures of different DBC were examined and summarized to provide a basis for understanding the environmental processes of DBC. Current research progress on the photodegradation of DBC, interactions between DBC and microorganisms, and the effects of DBC on the fate and transport of contaminants were critically reviewed. The qualitative and quantitative analytical methods for DBC were assessed in detail. To date, the environmental behaviors of DBC are far from fully understood in part due to the lack of systematic methods. Compared with the relatively well-studied photodegradation of DBC, microbial transformation of DBC is poorly understood. Moreover, DBC is exposed to continuous light illumination and microbial metabolization, thus the combined effects of photodegradation and biodegradation are crucial to the cycling and turnover of DBC in aquatic environment and deserve further investigations. In addition, research on the sorption processes, redox reactions and DBC-assisted photo-transformations of contaminants is still at its emerging stages.

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“…This type of drug has been used since the 1960s for severe pain, and after 1997, its consumption was almost 6334 kg in Austria alone [ 21 ]. In this context, water quality [ 22 ], ecosystems [ 23 ], and human health [ 24 ] are eventually impacted by drug residues in the environment [ 25 ]. For instance, it has been noted that CBZ is hazardous, even at doses lower than 100 mg/L, to aquatic organisms, animals and humans [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Retention of Ciprofloxacin and Carbamazepine from Aqueous Solutions Using Chitosan-Based Cryostructured Composites

Dumitru,

Neagu,

Miron

et al. 2024

Polymers

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Water pollution is becoming a great concern at the global level due to highly polluted effluents, which are charged year by year with increasing amounts of organic residues, dyes, pharmaceuticals and heavy metals. For some of these pollutants, the industrial treatment of wastewater is still relevant. Yet, in some cases, such as pharmaceuticals, specific treatment schemes are urgently required. Therefore, the present study describes the synthesis and evaluation of promising cryostructured composite adsorbents based on chitosan containing native minerals and two types of reinforcement materials (functionalized kaolin and synthetic silicate microparticles). The targeted pharmaceuticals refer to the ciprofloxacin (CIP) antibiotic and the carbamazepine (CBZ) drug, for which the current water treatment process seem to be less efficient, making them appear in exceedingly high concentrations, even in tap water. The study reveals first the progress made for improving the mechanical stability and resilience to water disintegration, as a function of pH, of chitosan-based cryostructures. Further on, a retention study shows that both pharmaceuticals are retained with high efficiency (up to 85.94% CIP and 86.38% CBZ) from diluted aqueous solutions.

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Co-transport and retention of zwitterionic ciprofloxacin with nano-biochar in saturated porous media: Impact of oxidized aging

Cited by 25 publications

References 49 publications

ZnO/γ-Fe2O3/Bentonite: An Efficient Solar-Light Active Magnetic Photocatalyst for the Degradation of Pharmaceutical Active Compounds

ZnO/γ-Fe2O3/Bentonite: An Efficient Solar-Light Active Magnetic Photocatalyst for the Degradation of Pharmaceutical Active Compounds

Analytical methods, molecular structures and biogeochemical behaviors of dissolved black carbon

Retention of Ciprofloxacin and Carbamazepine from Aqueous Solutions Using Chitosan-Based Cryostructured Composites

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