Tetracycline In Water Research Articles

CuCo2S4/sulfite reaction for efficient removal of tetracycline in water

CuCo2S4/sulfite reaction for efficient removal of tetracycline in water

High efficiently piezocatalysis degradation of tetracycline by few-layered MoS2/GDY: Mechanism and toxicity evaluation

A new strategy for the degradation of tetracycline in water by the piezo-catalysis of MoS2 doped with graphdiyne was proposed. The optimally doped MoS2/GDY-3 had a few and thin layer structure, and PFM characterization showed that the piezoelectric response of MoS2/GDY-3 was 35.29% higher than that of MoS2. MoS2/GDY-3 exhibited excellent catalytic activity, and the degradation rate of tetracycline reached 92.15% after 40 min by ball milling to trigger piezoelectric catalysis. After 5 cycles, the degradation rate reached 87.15%, which demonstrates the stability of the material. The influence of the MoS2/GDY-3 dosage, ball milling speed, TC concentration, pH, inorganic anions and water source on the degradation efficiency were investigated. ESR characterization showed that ∙OH and ∙O2– were the main active radicals of the piezoelectric catalysis. By analyzing the intermediate products, the possible degradation path of tetracycline was further analyzed, and a suitable mechanism of piezoelectric catalysis was proposed. The toxicity of intermediate products was evaluated to explore the toxicity changes in the degradation process. This work provides a new approach for changing the morphology of MoS2 to enhance its piezocatalytic performance and effectively degrade tetracycline in water.

Perylene diimide supermolecule (PDI) as a novel and highly efficient cocatalyst for photocatalytic degradation of tetracycline in water: A case study of PDI decorated graphitic carbon nitride/bismuth tungstate composite

Employing perylene diimide supermolecule (PDI) as metal-free cocatalyst, a novel PDI/g-C3N4/Bi2WO6 (PCB) photocatalyst was constructed for the effective degradation of antibiotics. Both the photocatalytic activity and photostability of g-C3N4/Bi2WO6 (gCB) were further improved after loading PDI. Under simulated sunlight illumination, the apparent rate constant of tetracycline (TC) degradation by PCB reached 2.6 times that of gCB. The photocatalytic activity of PCB still kept over 80% after 4 cycle experiments, while gCB only remained around 21%. The superior activity of PCB was ascribed to the synergism between the extended visible light absorption range through the participation of PDI cocatalyst and facilitated gCB-to-PDI photoelectron transfer. TC would finally be transformed into non-toxic ring opening products and mineralized. This work demonstrated that PDI was an excellent metal-free cocatalyst and exhibited great potential to boost the activity of photocatalysts.

Activation of peroxydisulfate by magnetically separable rGO/MnFe2O4 toward oxidation of tetracycline: Efficiency, mechanism and degradation pathways

• As-synthesized rGO/MnFe 2 O 4 can activate PDS to effectively degrade TC. • Activation mechanism of PDS and degradation pathway of TC were proposed. • The carbonyl group in rGO participated in the activation of PDS. • The 1 O 2 played a main role in the degradation of TC. • TC degradation in actual water matrices was studied. Peroxydisulfate (PDS) activation by a novel magnetically recoverable reduced graphene oxide (rGO)/MnFe 2 O 4 composite was studied for the removal of tetracycline (TC), a widely used antibiotic. The catalytic performance of rGO/MnFe 2 O 4 was greatly higher than that of bare MnFe 2 O 4 , and the degradation rate of TC tended to be raised as the content of rGO in composite catalyst increased. After reaction for 80 min, the optimized rGO/MnFe 2 O 4 -15 catalyst can degrade 90.1% of TC in water (20 mg/L) with the addition of 1.5 g⋅L −1 PDS. The effect of PDS dose, temperature, initial pH, inorganic anions and humic acid on TC removal was also examined. The quenching experiments and electron paramagnetic resonance (EPR) tests suggested that the radical (SO 4 •− and ∙ OH) and non-radical ( 1 O 2 ) oxidation processes worked together for the degradation of TC in rGO/MnFe 2 O 4 -PDS system. PDS was activated to produce SO 4 •− by MnFe 2 O 4 , and rGO can donate electron to facilitate the redox cycle of ≡M(II)/≡M(III) (M refers to Mn or Fe), thus promoting the formation of SO 4 •− . The carbonyl group in rGO participated in the activation of PDS to generate 1 O 2 . The linear sweep voltammetry indicated that rGO/MnFe 2 O 4 did not act as an electronic medium to promote the electron transfer from TC to PDS. The degradation products were identified by LC–MS and the possible degradation pathways of TC were put forward. Furtherly, the decontamination of natural actual water (tap water, secondary effluent and river water) spiked with TC were evaluated.

Synthesis of magnetic nanocomposite Fe3O4@ZIF-8@ZIF-67 and removal of tetracycline in water.

We prepared a double-layer magnetic nanocomposite Fe3O4@ZIF-8@ZIF-67 by layer-by-layer self-assembly. Fe3O4@ZIF-8@ZIF-67 was used to remove tetracycline from an aqueous solution via a combination of adsorption and Fenton-like oxidation. Depending on the outstanding porous structure of the Fe3O4@ZIF-8@ZIF-67, a high adsorption capacity for tetracycline was 356.25mgg-1, with > 95.47% removal efficiency within 100min based on Fenton-like oxidation. To better understand the mechanisms involved in integrated adsorption and Fenton-like oxidation, various advanced characterization techniques were used to monitor the changes in morphology and composition of Fe3O4@ZIF-8@ZIF-67 before and after removal of tetracycline. Scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD) all supported adsorption and Fenton oxidation of tetracycline. This study extends the application of Fe3O4@ZIF-8@ZIF-67 for environmental remediation.

Photocatalytic degradation of tetracycline in aqueous systems under visible light irridiation using needle-like SnO2 nanoparticles anchored on exfoliated g-C3N4

BackgroundPharmaceuticals is one of the groups of contaminants of emerging concern that are resistant to decomposition or removal by most of the existing water and wastewater treatment procedures, hence the need to develop techniques to facilitate the removals of this group of organic contaminants from water systems. In this study, needle-like SnO2 nanoparticles was synthesised and loaded on exfoliated g-C3N4 nanosheet through a hydrothermal method, for use as sensitive visible light induce-photocatalyst for the decomposition of tetracycline in aqueous systems. The synthesised composites was characterized and analysed for the nature of the heterojunction between the SnO2 nanoparticle and g-C3N4 nanosheet using microscopic and spectroscopic techniques.ResultsThe composites were of improved surface properties and enhanced visible-light absorption. The synthesised SnO2/g-C3N4 nanocomposites with various amounts of SnO2 (10–50 mg), employed in the degradation of tetracycline under visible light irradiation, were of good degradation efficiency. The degradation efficiencies of tetracycline by 1 wt.%, 2 wt.%, 3 wt.% and 5 wt.% SnO2/g-C3N4 photocatalyst were 81.54%, 90.57%, 95.90% and 92.15% as compared to g-C3N4 and SnO2 with 40.92% and 51.32% degradation efficiencies. The synergistic interaction between the needle-like SnO2 and exfoliated g-C3N4 nanosheet promoted the separation of photogenerated electron holes pairs, which enhanced their migration rate between SnO2 and g-C3N4 heterojunction, thereby facilitating the degradation of tetracycline. The ·O2− was noted to be the major reactive species in the photocatalytic of the 3 wt.% SnO2/g-C3N4 nanocomposite.ConclusionThe fabricated SnO2 nanoparticles anchored on exfoliated g-C3N4 showed good performance for the decomposition of tetracycline in water, with possible application on other pharmaceuticals having same moiety (similar chemical structures).

Designing Phenyl Porous Organic Polymers with High-Efficiency Tetracycline Adsorption Capacity and Wide pH Adaptability.

Adsorption is an effective method to remove tetracycline (TC) from water, and developing efficient and environment-friendly adsorbents is an interesting topic. Herein, a series of novel phenyl porous organic polymers (P-POPs), synthesized by one-pot polymerization of different ratios of biphenyl and triphenylbenzene under AlCl3 catalysis in CH2Cl2, was studied as a highly efficient adsorbent to removal of TC in water. Notably, the obtained POPs possessed abundant phenyl-containing functional groups, large specific surface area (1098 m2/g) with abundant microporous structure, high pore volume (0.579 cm3/g), favoring the removal of TC molecules. The maximum adsorption capacity (fitted by the Sips model) could achieve 581 mg/g, and the adsorption equilibrium is completed quickly within 1 h while obtaining excellent removal efficiency (98%). The TC adsorption process obeyed pseudo-second-order kinetics and fitted the Sips adsorption model well. Moreover, the adsorption of POPs to TC exhibited a wide range of pH (2–10) adaptability and outstanding reusability, which could be reused at least 5 times without significant changes in structure and efficiency. These results lay a theoretical foundation for the application of porous organic polymer adsorbents in antibiotic wastewater treatment.

Fe-Al Bimetallic Oxides Functionalized-Biochar Via Ball Milling for Enhanced Sorption of Tetracycline in Water

Fe-Al Bimetallic Oxides Functionalized-Biochar Via Ball Milling for Enhanced Sorption of Tetracycline in Water

Hydroxylamine Activated by Discharge Plasma for Synergetic Degradation of Tetracycline in Water: Insight into Performance and Mechanism

Hydroxylamine Activated by Discharge Plasma for Synergetic Degradation of Tetracycline in Water: Insight into Performance and Mechanism

Facile synthesis of amino-functionalized indium-based metal–organic frameworks and their superior light photocatalytic activity for degradation of tetracycline in water

The synthesized MIL-68(In)-NH2 photocatalyzed the degradation of tetracycline under visible light irradiation.

Fe-Al-Layered Double Hydroxide-Biochar Nanocomposites Via Ball Milling for Enhanced Sorption of Tetracycline in Water

Fe-Al-Layered Double Hydroxide-Biochar Nanocomposites Via Ball Milling for Enhanced Sorption of Tetracycline in Water

Dual Application: P-Cus/N-Zns Nanocomposite Construction for High Efficient Colorimetric Determination and Photocatalytic Degradation of Tetracycline in Water

Dual Application: P-Cus/N-Zns Nanocomposite Construction for High Efficient Colorimetric Determination and Photocatalytic Degradation of Tetracycline in Water

Degradation of tetracycline by atmospheric-pressure non-thermal plasma: Enhanced performance, degradation mechanism, and toxicity evaluation

Tetracycline is a common antibiotic and is often carelessly released into the natural environment, thus constantly posing potential threats to the environment. Currently, due to lack of effective methods to remove it from the environmental water system, researchers are still exploring new ways to deal with tetracycline. In this work, we employed atmospheric-pressure non-thermal plasma (NTP) to treat tetracycline in water and investigated the involved degradation mechanism. The enhanced degradation efficiency was acquired and investigated, and the degradation mechanism by the plasma-generated active species were explored. The tetracycline degradation pathways via especially the interactions with plasma-generated hydroxyl radical and ozone were examined by virtue of UV spectroscopy, three-dimensional fluorescence spectroscopy, high performance liquid chromatography-mass spectrometry (HPLC-MS), together with the assistance of theoretical simulations. Moreover, the toxicological evaluation of NTP treatment of tetracycline was also provided, which confirmed that the biological toxicity of tetracycline degradation products was negligible. Therefore, this work provides not only the effective way of treating antibiotics by engineered plasma technology, but also the insights into the mechanisms of degradation of antibiotics by NTP.

RETRACTED: Study on the Removal Efficiency and Mechanism of Tetracycline in Water Using Biochar and Magnetic Biochar

In this study, a new type of sludge-derived biochar material with high tetracycline removal efficiency, named magnetic Fe3O4 biochar, was accomplished by KOH activated and loaded with magnetic Fe3O4. The particles with spherical pellets observed by SEM, as well as the XRD patterns, indicated that magnetic Fe3O4 nanoparticles were successfully loaded onto the biochar. We studied the adsorption effects and mechanisms of the following three different adsorption materials for tetracycline: biochar (BC), magnetic Fe3O4, and magnetic biochar (MBC), and the loading conditions and reusability of the materials were also considered. The adsorption effects were as follows: Fe3O4 (94.3%) > MBC (88.3%) > BC (65.7%), and the ratio of biochar to ferric salt was 0.2:1; the removal effect reached the best result. Under an acidic condition, the adsorption capacity of all the materials reached the maximum, and the adsorption of tetracycline in water, by three adsorbents, involves chemical adsorption as the leading process and physical adsorption as the auxiliary process. Various characterizations indicated the removal of tetracycline, including pore filling, electrostatic interaction, hydrogen bond action, and cationic-π action. Complex bridging is a unique adsorption mechanism of magnetic Fe3O4 and magnetic biochar. In addition, the magnetic biochar also possesses π–π bond interaction. The magnetic materials can still maintain a certain amount of adsorption capacity on tetracycline after five cycles. This study proved that the magnetic sludge-based biochar are ideal adsorbents for the removal of tetracycline from water, as well as an effective route for the reclamation of waste sludge.

Insights into the mechanism of enhanced peroxymonosulfate degraded tetracycline using metal organic framework derived carbonyl modified carbon-coated Fe0

Tetracycline (TC) is a commonly used antibiotic that has gained wide spread notoriety owing to its high environmental risks. In this study, rich carbonyl-modified carbon-coated Fe0 was obtained by pyrolysis of MIL-100(Fe) in an Ar atmosphere, and used to activate peroxymonosulfate (PMS) for the degradation of tetracycline in water. The roles of Fe0, carbon and surface carbonyl on PMS activation were investigated. Fe0 continuously activated PMS, acted as a sustained-release source of Fe2+, and could effectively activate PMS to produce SO4•−, O2•− and •OH. Carbon was found to do responsible for electron transportation during the activation of PMS and slow down the oxidation of Fe0. The carbonyl group on the carbon surface layer was the active site of 1O2, which explains the enhanced performance for TC degradation. When Ca = 0.1 g/L and C0 = 0.4 mM, TC degradation rate reached 96%, which was attributed to the synergistic effect of radicals (i.e., SO4•−, O2•−, •OH) and non-radical (i.e., 1O2). Finally, the degradation pathway was proposed by combining density functional theory (DFT) calculations with liquid chromatography-mass spectrometry (LC-MS), toxicities of the intermediate products were also evaluated. All results show that carbonyl-modified carbon-coated Fe0 possesses promising capacity for the removal of antibiotics from water.

Luminescent Zn (II) coordination polymers for highly selective detection of triethylamine, nitrobenzene and tetracycline in water systems

Two novel coordination polymers (CPs), formulated as {[Zn3(L)1.5(DMF)3]•C2H7N} n (1), and [Zn(L)0.5(bpb)0.5(H2O)2] n (2), (H4L = 1, 1′-ethylbiphenyl −3, 3′, 5, 5′- tetracarboxylic acid, bpb = 1, 4-di(pyridin-4-yl) benzene), have been acquired under hydrothermal conditions. Complexes 1 and 2 display excellent luminescence characteristics and stability in antibiotics and organic solvents. Complex 1 can detect triethylamine (TEA) and tetracycline (TET) in water by fluorescence quenching. The detection limits of 1 towards TEA and TET are 1.07 μM and 0.1 μM, respectively. Complex 2 can be used as a luminescence sensor to detect nitrobenzene (NB) and the detection limit towards NB is 0.2 μM. Moreover, complexes 1 and 2 perform excellent reproducibility, because the changes of fluorescence intensity are negligible after four cycles. The mechanism of the fluorescence quenching is discussed in detail.

Combined Electro-Fenton and Anodic Oxidation Processes at a Sub-Stoichiometric Titanium Oxide (Ti4O7) Ceramic Electrode for the Degradation of Tetracycline in Water

The mineralization of tetracycline by electrochemical advanced oxidation processes (EAOPs) as well as the study of the toxicity of its intermediates and degradation products are presented. Electro-Fenton (EF), anodic oxidation (AO), and electro-Fenton coupled with anodic oxidation (EF/AO) were used to degrade tetracycline on carbon felt (cathode) and a sub-stoichiometric titanium oxide (Ti4O7) layer deposited on Ti (anode). As compared to EF and AO, the coupled EF/AO system resulted in the highest pollutant removal efficiencies: total organic carbon removal was 69 ± 1% and 68 ± 1%, at 20 ppm and 50 ppm of initial concentration of tetracycline, respectively. The effect of electrolysis current on removal efficiency, mineralization current efficiency, energy consumption, and solution toxicity of tetracycline mineralization were investigated for 20 ppm and 50 ppm tetracycline. The EF/AO process using a Ti4O7 anode and CF cathode provides low energy and high removal efficiency of tetracycline caused by the production of hydroxyl radicals both at the surface of the non-active Ti4O7 electrode and in solution by the electro-Fenton process at the cathodic carbon felt. Complete removal of tetracycline was observed from HPLC data after 30 min at optimized conditions of 120 mA and 210 mA for 20 ppm and 50 ppm tetracycline concentrations. Degradation products were elucidated, and the toxicity of the products were measured with luminescence using Microtox® bacteria toxicity test.

Ferrocene modified g-C3N4 as a heterogeneous catalyst for photo-assisted activation of persulfate for the degradation of tetracycline

In this study, the oxidative degradation of tetracycline (TC) by ferrocene-modified graphite phase carbon nitride (Fe/g-C 3 N 4 ) activated persulfate (PS) under light-assisted conditions is examined. The materials are characterized by a series of methods such as SEM, TEM, XRD, FTIR, XPS, etc. This article explores the influence of the amount of sulfate, the initial concentration of pollutants, the amount of catalyst, and the pH value on the reaction system. When the amount of PS added reaches 2.5 mM and the catalyst dosage is 1 g L −1 , the Fe/g-C 3 N 4 /PS/Vis exhibit the best performance for tetracycline removal. In 60 min, the removal of tetracycline reaches 93% under its natural pH. In the reaction system acidic neutral conditions are more conducive to degrade TC. The results show that the doping of ferrocene inhibits the recombination of electron-hole pairs in the g-C 3 N 4 , expands the light response range to speed up the removal rate of tetracycline. At the same time, iron cycle generated by ferrocene modification helps to activate persulfate to produce sulfate radicals with strong oxidizing properties. Sulfate radicals, hydroxyl radicals, superoxide radicals and holes are the main active species proved by ESR test and the quenching experiments. The synergy between photocatalysis and PS activation promotes the production of active species and the tetracycline removal. The results show that the Fe/g-C 3 N 4 composite material activated persulfate under visible light is an effective method to remove tetracycline from water. In this paper, the synthesis of ferrocene doped graphite phase carbon nitride and the removal of tetracycline in water by activated persulfate are mainly introduced.

Synthesis of bifunctional composites Ag/BiOCl/diatomite: Degradation of tetracycline and evaluation of antimicrobial activity

In this study, Ag/BiOCl/diatomite composite material was prepared by simple hydrothermal method on the basis of diatomite, which has the dual effect of degrading tetracycline and inactivation of microorganisms (E. coli). The structure and properties of the composites were analyzed by various characterization methods. According to the obtained data, the degradation rate of tetracycline (TC) reached 97.8% by Ag(7.5%)/BiOCl/diatomite composites within 60 min of visible light irradiation. Under natural conditions, the antibacterial activity of the composite to E. coli decreased to 99.9% after 25 min. After three repeated experiments, the prepared composite samples still have good catalytic performance, which shows the stability of the catalyst. Finally, a possible photocatalytic degradation mechanism was proposed. Oxygen vacancies (OVs), superoxide radicals (•O2-), holes (h+) and hydroxyl radicals (•OH) are significance active substances, which play an important role in the photodegradation of TC. In this experiment, Ag/BiOCl/diatomite composite material was prepared to degrade tetracycline in water with high antimicrobial activity, which provides a simple method and has a certain application prospect.

Construction of S-scheme 1D/2D rod-like g-C3N4/V2O5 heterostructure with enhanced sonophotocatalytic degradation for Tetracycline antibiotics

Pharmaceutically active compounds are an emerging water contaminant that resists conventional wastewater treatments. Herein, the sonophotocatalytic degradation of Tetracycline (TC) antibiotics as a model contaminant was carried out over a rod-like g-C3N4/V2O5 (RCN-VO) nanocomposite. RCN-VO nanocomposite was synthesized via ultrasound-assisted thermal polycondensation method. The results showed that the RCN-VO nanocomposite could completely remove the TC in water within 60 min under simultaneous irradiation of visible light and ultrasound. Moreover, the sonophotocatalytic TC degradation (a synergy index of ∼1.5) was superior to the sum of individual sonocatalytic and photocatalytic degradation using RCN-VO nanocomposite. Besides, the enhanced sonophotocatalytic activity of RCN-VO can be attributed to the 1D/2D nanostructure and the S-scheme heterojunction formation between RCN and VO where the electrons migrated from RCN to VO across the RCN-VO interface. Under irradiation, the built-in electric field, band edge bending and Coulomb interaction can synergistically facilitate the unavailing electron-hole pair recombination. Thereby, the cumulative electron in RCN and holes in VO can actively take part in the redox reaction which generates free radicals and attack the TC molecules. This study provides insight into a novel S-Scheme heterojunction photocatalyst for the removal of various refractory contaminants via sonophotocatalytic degradation.