Tetracycline In Wastewater Research Articles

Influence of microwave-assisted synthesis on the structural and textural properties of mesoporous MIL-101(Fe) and NH2-MIL-101(Fe) for enhanced tetracycline adsorption

In this paper, the effect of conventional solvothermal and a microwave-assisted method for the synthesis of MIL-101(Fe) and NH2-MIL-101(Fe) as adsorbents for the removal of tetracycline in wastewater is reported for the first time. The results had shown that the microwave treatment led to a significant reduction in the material synthesis time, which greatly saved the energy. It was also found that the microwave-assisted synthesized material exhibited small particle size, high specific surface area and better adsorption capacity. The introduction of amino group further enhanced the adsorption capacity of MIL-101(Fe). The adsorption capacity of MIL-101(Fe) and NH2-MIL-101(Fe) samples for tetracycline adsorption by microwave assisted synthesis method reached up to 332 mg/g and 378 mg/g, respectively. Moreover, the adsorption isotherm was well-fit with Freundlich model, indicating a multilayer adsorption. The kinetic studies indicated that the reaction followed pseudo second-order reaction kinetics with a best fit to the theoretical value. Due to the higher adsorption efficiency and lower energy consumption of the synthesis, the as-prepared microwave assisted materials could be used as potential adsorbents for different pollutants in wastewater.

Synthesis and characterization of a novel CNT-FeNi3/DFNS/Cu(ii) magnetic nanocomposite for the photocatalytic degradation of tetracycline in wastewater.

Herein, Cu(ii) complexes were anchored within the nanospaces of a magnetic fibrous silicate with a high surface area and easily accessible active sites via a facile approach, leading to the successful synthesis of a novel potent nanocatalyst (FeNi3/DFNS/Cu). Furthermore, FeNi3/DFNS/Cu was supported on carbon nanotubes (CNTs) via an usual nozzle electrospinning method (CNT-FeNi3/DFNS/Cu). In addition, its performance as a photocatalyst for the degradation of tetracycline was tested in a batch reactor. Tetracycline is an antibiotic that is commonly utilized in veterinary medicine and in the treatment of human infections, but is hazardous to aquatic environments. However, the usual processes for the removal of tetracycline are not efficient. The eco-friendly attributes of this catalytic system include high catalytic activity and ease of recovery from the reaction mixture using an external magnet, and it can be reused several times without significant loss in its performance. Also, protocols such as hot filtration, and mercury poisoning provided complete insight into the nature of this heterogeneous catalyst.

Global development of the studies focused on antibiotics in aquatic systems from 1945 to 2017.

Antibiotics are used to fight diseases in humans and farm animals. Their residues, however, can enter aquatic environments and affect the resistance of non-target microbial strains, and the prevalence of antibiotic resistance genes (ARGs) potentially poses negative impacts on human health. In order to better understand how the studies of antibiotics have been conducted, we analyzed the publications on antibiotics in aquatic systems for the period of 1945-2017. We applied a bibliometric analysis method by coupling cluster analysis and network analysis. Results indicated that early research on antibiotics in water was mostly performed in America and Europe, while, in recent years, publications for the same subject were dominated by China and the USA. The majority of the articles were published in journal Chemosphere and the most representative subject categories of the seven sections were "Environmental science and ecology," "Chemistry," "Engineering," "Biochemistry and molecular biology," "Water resources," "Agriculture," and "Pharmacology and pharmacy." The most studied class of antibiotics was tetracyclines in wastewater. Antibiotic resistance, ARGs, Escherichia coli, and some mechanistic studies such as adsorption, toxicity, degradation, and kinetics were common topics in this field. ARGs present a major public health concern and much attention should be directed at the problems with antibiotics in the future studies of water.

All-solid-state Z-scheme system of RGO-Cu2O/Fe2O3 for simultaneous hydrogen production and tetracycline degradation

The Cu2O and Fe2O3 semiconductors were employed to construct a series of composite photocatalysts by one-step solvothermal synthesis. The reduced graphene oxide (RGO) was used as a solid-state medium to efficiently transport photogenerated electrons from the conduction band of Fe2O3 to valence band of Cu2O, which played a key role in the introduction of tetracycline (TC) degradation during H2 production. The RGO-Cu2O/Fe2O3 composites exhibited the more excellent photocatalytic performance than the single Cu2O or Fe2O3 on the H2 production and TC degradation. Moreover, it is the first time that TC was used as a scavenger to consume the holes during H2 production, resulting in a higher H2 production efficiency than that using methanol (equal mass). The H2 production from TC solution with the G50-7/3 composite was about eight times higher than that in pure water and five times higher than that from methanol solution. This work successfully concentrated H2 production and TC degradation in a system and TC in wastewater showed a huge development potential in the field of sacrificial agents for H2 production.

Influence of parameters on the photocatalytic degradation of tetracycline in wastewater: A review

ABSTRACTWater pollution by organic pollutants is an ever-increasing problem for the global concerns. Some recently published papers are reviewed and summarized with the focus being on the photocatalytic oxidation of tetracycline in wastewater effluent. In this review, the effects of various operating parameters on the photocatalytic degradation of tetracycline are presented. Recent findings suggested that type of photocatalyst and composition, initial substrate concentration, amount of catalyst, pH of the reaction medium, ionic components in water, solvent types, and oxidizing agents/electron acceptors can play an important role on the photocatalytic degradation of tetracycline.

Biodegradation of three tetracyclines in swine wastewater

Tetracyclines (TCs), including tetracycline (TC), oxytetracycline (OTC), and chlortetracycline (CTC), are amongst the most common antibiotics used in animal husbandry. Residual amounts of these antibiotics in the environment are a concern because they contribute to selection of resistant bacteria. In this study, we investigated the biodegradation of three TCs in swine wastewater. In batch experiments, OTC and CTC were completely degraded at d 18 and 20, respectively, but TC was remained at 7.1% after 20 d incubation. The degradation rates of TCs in the wastewater were in the order of OTC > CTC > TC. Degradation of the TCs was enhanced by the addition of enzyme extract from spent mushroom compost (SMC) of Pleurotus eryngii. The degradation rates were higher with the addition of extract‐containing microcapsules than suspended enzyme extract in swine wastewater. In the bioreactor experiment, the addition of extract‐containing microcapsules enhanced the removal rates of the three TCs, and adding TCs twice maintained enzyme activity in the swine wastewater. Of the microorganism strains isolated from the wastewater samples, strain HL2 (identified as Xanthobacter flavus) showed the best degrading ability.