Effective Elimination of Contaminant Antibiotics Using High-Surface-Area Magnetic-Functionalized Graphene Nanocomposites Developed from Plastic Waste (original) (raw)
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Graphene oxide as a new generation adsorbent for the removal of antibiotics from waters
Separation Science and Technology, 2020
The presence of antibiotic molecules in the natural water sources is currently a huge problem due to the development of bacterial resistance. Graphene oxide (GO) has a large potential as a candidate for the applications of water treatment. In this paper, graphene oxide was tested as a new generation adsorbent for the removal of two antibiotics: trimethoprim (TMP) and isoniazid (INH). Both adsorption processes reached the equilibrium in less than one hour. Maximum adsorption capacities were found to be 204.08 mg g-1 for TMP and 13.89 mg g-1 for INH. TMP adsorption on GO was favoured in alkaline medium while the performance of GO for INH adsorption was better in acidic conditions.
International Journal of Pharmaceutical Investigation, 2021
Background: Antibiotics have lasting effects on the environment. Among the properties of these substances are non-biodegradable, carcinogenic, high toxicity, and an increase in antibiotic-resistant bacteria. Therefore, they should be removed from aqueous solutions and the point of this think was to adsorb amoxicillin (AMO) by magnetic graphene oxide nanocomposite (MGO). Methods: The adsorption behavior of AMO was studied in a series of batch experiments as a function of pH (3-11), contact time (0-120 min), and AMO concentration (10-100 mg/L) different MGO dosages (0.1-1 g/L). The structures of MGO were confirmed by scanning electron microscope (SEM), and the X-ray diffraction (XRD). Results: The results revealed in optimized conditions (pH=3, contact time=75 min, AMO concentration= 10mg/L and adsorbent dose=0.75 g/L) maximum adsorption capacity and removal efficiency of AMO were 98.41 mg/g, respectively. The thermodynamical parameters showed that the sorption method was endothermal and spontaneous. Conclusion: MGO nanoparticles have extended capabilities such as easy and rapid separation from solution and high potential in removing AMO, so, it can be introduced as an appropriate adsorbent for removal of this antibiotics from water and wastewater.
Scientific Reports, 2022
In this work, the synthesis of an rGO/nZVI composite was achieved for the first time using a simple and green procedure via Atriplex halimus leaves extract as a reducing and stabilizing agent to uphold the green chemistry principles such as less hazardous chemical synthesis. Several tools have been used to confirm the successful synthesis of the composite such as SEM, EDX, XPS, XRD, FTIR, and zeta potential which indicated the successful fabrication of the composite. The novel composite was compared with pristine nZVI for the removal aptitude of a doxycycline antibiotic with different initial concentrations to study the synergistic effect between rGO and nZVI. The adsorptive removal of bare nZVI was 90% using the removal conditions of 25 mg L −1 , 25 °C, and 0.05 g, whereas the adsorptive removal of doxycycline by the rGO/nZVI composite reached 94.6% confirming the synergistic effect between nZVI and rGO. The adsorption process followed the pseudo-second order and was wellfitted to Freundlich models with a maximum adsorption capacity of 31.61 mg g −1 at 25 °C and pH 7. A plausible mechanism for the removal of DC was suggested. Besides, the reusability of the rGO/nZVI composite was confirmed by having an efficacy of 60% after six successive cycles of regeneration. Water scarcity and pollution are now serious threats to all nations. Pollution of water, specifically, with antibiotics has increased in recent years because of the increased production and consumption during the COVID-19 pandemic 1-3. Thus, developing an effective technique to eliminate antibiotics from wastewater is of great concern. One of the resistant semisynthetic antibiotics that is derived from the tetracycline group is Doxycycline (DC) 4,5. The remains of DC have been reported in ground and surface water as it cannot be metabolized, only 20-50% is metabolized, and the remaining is discharged into the environment causing serious environmental and health problems 6. Low levels contact of with DC can kill aquatic photosynthetic microbes, pose a threat to the transmission of antimicrobial bacteria, and increase antimicrobial resistance; therefore, it is a necessity to remove this pollutant from the water effluent. The natural degradation of DC in water is a very slow process. Physio-chemical processes, such as photolysis, biodegradation, and adsorption can degrade only in small concentrations and at a very slow rate 7,8. However, adsorption is the most cost-effective, simple, environmentally friendly, facile in handling, and highly efficient approach 9,10. Nano-zero valent iron (nZVI) is a very effective material in the elimination of many antibiotics from water including metronidazole diazepam, ciprofloxacin, chloramphenicol, and tetracycline. This ability comes from the astonishing properties that nZVI possesses such as great reactivity, large surface area, and numerous exterior binding sites 11. However, nZVI tends to agglomerate in aqueous media because of the Van der Wales forces and
DESALINATION AND WATER TREATMENT, 2021
The efficiency of reduced graphene oxide magnetite (rGOM) to remove selected non-steroidal anti-inflammatory drugs from wastewater at high concentration was evaluated. Diclofenac sodium (DCS) and aspirin (ASP) were chosen as target pharmaceuticals due to their common persistency in wastewater. rGOM was prepared to form graphene oxide (GO) using a one-step procedure where the reduction of GO and attachment of Fe 3 O 4 particles to the surface of GO was carried out simultaneously. rGOM showed very good efficiency with percent removal of 98.5% and 90.5% at the optimum conditions for ASP and DCS, respectively. The optimum condition for removal of DCS is adsorbent dosage 14 g L-1 , the contact time of 40 min, and a pH of 5.0. While the optimum conditions for ASP are adsorbent dosage 16 g L-1 , contact time 40 min, and a pH of 3.0. The adsorption process was evaluated through different adsorption isotherm and kinetic models. Langmuir isotherm model was found to be the best fitting for DCS adsorption with Q m and K L values of 12.95 mg g-1 and 0.091 L mg-1 , respectively. On the other hand, ASP removal was best described by the Freundlich isotherm model with K F and n values of 5.95 and 2.49, respectively. Both processes showed fast kinetics. Thermodynamic properties were calculated using the Sips isotherm model. The adsorption of both drugs was found to be spontaneous with a negative value of Gibbs free energy and positive enthalpy change indicating that the adsorption process was endothermic. Continuous fixed-bed column adsorption was performed, and the data were fitted using different isotherm models and it was observed that adsorption of DCS follows Yan model while adsorption of ASP is described by Bohart-Adams model. A regeneration study was carried out which showed that the removal efficiency was still significant for both ASP and DCS even after three cycles.
Nanomaterials for the Adsorptive Removal of Antibiotics from Aqueous Solution: A Minireview
General Chemistry, 2020
In the last decade, researchers discovered the existence of new type of emerging pharmaceutical pollutants such as drugs, personal care products, hormones, and so on, in wastewater as well as drinking water. These contaminants are hard to remove using conventional treatment technology. The use of advanced nanomaterials-based technologies for the treatment of emerging contaminants from wastewater and drinking are gaining much attention from the researchers. Adsorption is one of the wastewater treatment methods for the decontamination of wastewater. Herein, the applications of a variety of pure materials as well as nanocomposite materials are summarized used for adsorptive removal of antibiotics. The role of different functional groups and adsorption forces are discussed.
DESALINATION AND WATER TREATMENT, 2019
Tetracycline (TC), a major pollutant in water, has an adverse effect on ecosystem and human health. Thus, it is urgent to remove but still remains a challenging. In this work, a new adsorbent of MnO 2 decorated on sodium hypochlorite treated expanded graphite (MnO 2 /TEG) was developed by an in situ hydrothermal method, which exhibited a highly removal rate of 99.2% to pharmaceutical wastewater treated by flocculation. The structure and morphology of the adsorbent was studied by detailed physical characterization. Meanwhile, the main influencing factors on the adsorption behavior such as pH value, concentration, temperature of the solution, adsorption time, metal oxide species and MnO 2 loading amount were also investigated in detail. It was found that the electrostatic adsorption between Mn 4+ in MnO 2 /TEG and dimethylamino groups in TC molecules played an important role during the adsorption process. These excellent properties proved that the novel composite could be applied to remove TC residues in pharmaceutical wastewater.
Carbon-based materials: adsorptive removal of antibiotics from water
Water Emerging Contaminants & Nanoplastics, 2023
The contamination generated by multiple antibiotics represents a general concern given its impact at the environmental level, mainly affecting the planet’s soil and water and impacting the development of numerous species. Additionally, a new problem has been triggered in terms of the development of antibiotic-resistance genes in various pathogenic microorganisms generating concern for the health sector in terms of the efficiency of antibiotics in the future. These actual problems and concerns demand efforts and actions to remove or eliminate these contaminants. Multiple alternatives to reduce the impact of antibiotics in water have been carried out, such as advanced oxidation, reverse osmosis, and membrane filtration. However, adsorption techniques have presented more favorable and viable results in which carbon-based materials are an efficient tool to remediate the environment that can take advantage of other alternatives due to their characteristics. This review presents different carbon-based absorptive materials such as biochar, carbon nanotubes, activated carbon, and graphene to remove these contaminants, given their characteristics and favorable results. However, process integration, production, and modification continue to be challenging and require more research and experimentation.
Nanosystems: Physics, Chemistry, Mathematics, 2020
The purpose of this study was to evaluate the efficiency of porous magnetic graphene (PMG) for removal of Erythromycin (ER) from aqueous solutions. PMG was prepared from banana peel residue, which was considered as a discarded material. As-synthesized nanocomposite was characterized by SEM, AFM, FTIR, RAMAN and BET analysis. The optimum conditions were obtained at pH of 3, contact time of 30 min, initial antibiotic concentration of 200 mg/L, and adsorbent dose of 0.35 g/L. In equilibrium, the Langmuir isotherm model was the best fit to the experimental data for the kinetics study, the adsorption process developed the pseudo-second-order model. According to the results, nanosheet had high adsorption capacity (286 mg/g) and can be considered as an acceptable adsorbent for the removal of ER from aqueous solutions.
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019
In this study, the mesoporous silica-magnetic graphene oxide nanocomposite material (mGO-Si) was prepared. The surfactant cetyltrimethyl ammonim bromide (CTAB) was utilized as the mesoporous template while the tetraethyl orthosilicate (TEOS) was used as the silica source. The synthesized nanocomposite was characterized through different analyses, namely XRD, XPS, TEM, FT-IR, VSM, BET, and acid-base titration. Various factors like the effects of the initial concentration, contact time, influence of the pH and the coexistence of other antibiotics on the sulfamethoxazole (SMX) uptake, were investigated. Adsorption results exhibited that the mGO-Si adsorbed the SMX molecules more effectively than the pristine magnetic graphene oxide (mGO). Kinetic data showed good correlation on the basis of the pseudo-second-order model. The equilibrium adsorption data fitted well to the Langmuir model, and a maximum SMX adsorption capacity of 15.46 mg/g was obtained. At high pH, the solution had significantly impaired the then declined capacity of SMX adsorption. Electrostatic repulsion occurred between the dissociated SMX and the more negatively charged mGO-Si at basic pH. Adsorption mechanisms between SMX and mGO-Si were plausibly activated by hydrogen bonding, π-π EDA interactions, and solution pH-based electrostatic interactions dependent upon the status of SMX and the pH,PZC of mGO-Si. Moreover, the CIP and OTC competitors in the mixed solute system managed to improve the SMX adsorption by acting as a bridge to form CIP−SMX−mGO-Si/ OTC−SMX−mGO-Si surface complex. At low aqueous phase concentration of SMX, CIP was likely to form a stronger electrostatic interaction system with the adsorbent, thereby resulting in an adsorption level which was more competitive in the process opposing CIP to SMX than in that opposing OTC to SMX.