Tetracycline Hydrochloride In Water Research Articles

Mechanochemical Ball Mill Goethite to Activate Sodium Persulfate for the Treatment of Organic Wastewater Containing Tetracycline Hydrochloride

The contamination of aquatic systems by tetracycline hydrochloride (TC) has emerged as an urgent environmental concern necessitating immediate intervention. Herein, a mechanochemical approach was utilized to synthesize a FeOOH@AC nanocomposite through the co-grinding of goethite (FeOOH), hydroxylamine hydrochloride (NH2OH⋅HCl), and activated carbon (AC). The FeOOH@AC nanocomposite acted as a catalyst for the activation of sodium persulfate (PS), producing strong oxidizing radicals for the removal of TC from water. The results demonstrated that the physicochemical properties and crystal structure of FeOOH were altered via ball-milling treatment. The activation of PS-generated sulfate radicals (SO[Formula: see text] and hydroxyl radicals ([Formula: see text]OH) synergistically degraded TC. Additionally, the degradation rate of TC in a 50[Formula: see text]mg/L solution reached 91.26% after the addition of FeOOH@AC and PS. This work offers a theoretical and technical foundation for the mechanochemical ball milling preparation of FeOOH@AC, facilitating PS activation for the degradation of TC in water.

Iron–Cobalt Bimetallic Metal–Organic Framework-Derived Carbon Materials Activate PMS to Degrade Tetracycline Hydrochloride in Water

Organic pollutants entering water bodies lead to severe water pollution, posing a threat to human health. The activation of persulfate advanced oxidation processes using carbon materials derived from MOFs as substrates can efficiently treat wastewater contaminated with organic pollutants. This research uses NH2-MIL-101(Fe) as a substrate, doped with Fe2+ and Co2+, to prepare Fe/Co-CNs through a one-step carbonization method. The surface morphology, pore structure, and chemical composition of Fe/Co-CNs were investigated using characterization techniques such as XRD, SEM, TEM, XPS, FT-IR, BET, and Raman. A comparative study was conducted on the performance of catalysts with different Fe/Co ratios in activating PMS for the degradation of organic pollutants, as well as the effects of various influencing factors (the dosage of Fe/Co-CNs, the amount of peroxymonosulfate (PMS), the initial pH of the solution, the TC concentration, and inorganic anions) on the catalyst’s activation of persulfate for TC degradation. Through radical quenching experiments and post-degradation XPS analysis, the active radicals in the FeCo-CNs/PMS system were investigated to explain the possible mechanism of TC degradation in the Fe/Co-CNs/PMS system. The results indicate that Fe/Co-CNs-2 (with a Co2+ doping amount of 20%) achieves a degradation rate of 93.34% for TC (tetracycline hydrochloride) within 30 min when activating PMS, outperforming other Co2+ doping amounts. In addition, singlet oxygen (1O2) is the main reactive species in the reaction system.

Heterogeneous Activation of Sulfite by a Three-Dimensional Printed Hierarchically Porous Copper Catalyst for the Degradation of Tetracycline Hydrochloride in Water

Heterogeneous Activation of Sulfite by a Three-Dimensional Printed Hierarchically Porous Copper Catalyst for the Degradation of Tetracycline Hydrochloride in Water

Methodological aspects of the use of Chlorella vulgaris green algae in biotesting the environment of industrial facilities

Excessive and uncontrolled use of tetracycline antibiotics in animal husbandry and poultry farming is the cause of their toxic effects on the body of employees of the enterprise. The fact of indirect exposure confirms the presence of background concentrations of antibiotics in the urine of workers of livestock and poultry complexes. To assess the toxic effect of background concentrations of antibiotics during inhalation and oral exposure, there is a need to improve the methodological tools of biotesting.
 The study aims to evaluate the methodological possibilities for biotesting water and air samples containing tetracycline hydrochloride (THC) in different concentrations using the green algae Chlorella vulgaris as a test object.
 The authors considered the main methodological aspects of assessing the toxic effect of tetracycline group antibiotic — tetracycline hydrochloride by bioassay using green algae Chlorella vulgaris as a test object. The criterion for assessing toxicity was the change in the optical density of the algae culture during the day. We have based the criteria for the use of chlorella vulgaris in the biotesting method for assessing the toxic effect of tetracycline hydrochloride concentrations contained in water and air.
 Toxicological studies have shown a very high correlation (R=0.99; R2=0.98; A=0.23, p=0.045) between the indicator of the optical density of the algae culture and the concentration of tetracycline hydrochloride in water in the range from 0.006 to 0.1 mg/ml. We have the methodological capabilities of biotesting tetracycline hydrochloride in air at the maximum permissible concentration (MPC) (0.1 mg/m3) and above.
 The study showed that the growth reaction of the Chlorella vulgaris green algae culture to the effects of tetracycline hydrochloride makes it possible to develop a methodological apparatus for assessing the toxicity of the antibiotic in concentrations created in working areas at livestock and poultry facilities.
 Ethics. The research did not require the conclusion of the Ethics Committee.

Activation of periodate by chalcopyrite for efficient degradation of tetracycline hydrochloride

Activation of periodate (PI) has been widely recognized as an efficient and economical technique for the elimination of contaminants. In this study, a novel system with PI triggered by chalcopyrite (CuFeS2) was applied in the decomposition of tetracycline hydrochloride (TC). Effects of CuFeS2 dosage, PI concentration, pH value, inorganic anions, valence state change of Iodine ions (I-) were tested. The experimental findings demonstrated that the CuFeS2/PI system could successfully decompose TC in water under mild alkaline conditions (89.5 %, pH = 8). Compared with the other catalysts and the other CuFeS2/peroxide systems, CuFeS2/PI system exhibited more superior decontamination performance. Involvement of multiple reactive oxygen species such as superoxide radical (·O2–), hydroxyl radical (*OH) and singlet oxygen (1O2) in TC decomposition was confirmed by Electron spin resonance (ESR) tests and quenching experiment, and the interactions between Cu(Ⅱ)/Fe(III) and Cu(I)/Fe(Ⅱ) was confirmed. Based on a calculation using the density functional theory (DFT), the active sites of CuFeS2 for PI activation were revealed. Additionally, the analysis of degradation intermediates was conducted, with the toxicity of the intermediates analyzed. The CuFeS2/PI system was then applied in the treatment of real water samples, and the reusability of CuFeS2 was also investigated. This research presents a novel strategy as well as a theoretical foundation for CuFeS2 triggered PI to remove antibiotic contaminants.

Turn-off luminescence sensing activities of amide-functionalized Zn-MOF toward biomarker (2-methoxyethoxy)acetic acid and antibiotic tetracycline

One Zn-MOF, namely, {[Zn(L)0.5(bpy)0.5(H2O)]·H2O·DMF}n (LCU-123), was synthesized from an amide-containing carboxylic acid N,N’’-(3,5-dicarboxylphenyl)benzene-1,4-dicarbox-amide (H4L) and 4,4’-bipyridine. The carboxylate ligand and 4,4’-bipyridine connect Zn(II) centers to form two-dimensional layers. Adjacent 2D layers are stacked to form a stable supramolecular structure with one-dimensional channels. Luminescence measurements indicated that the complex exhibited excellent multiple sensing activities toward biomarker (2-methoxyethoxy)acetic acid (MEAA) and antibiotic tetracycline hydrochloride (TC). It is worth noting that the LOD for MEAA and TC were as low as 18.030 and 0.552 μM, respectively. Investigations on the sensing mechanism indicated that the luminescence quenching of MEAA was due to the weak interaction and dynamic quenching mechanism, while the quenching sensing of TC was attributed to competitive absorption and PET effect. The recoveries for the sensing analytes are satisfactory from 102.8 to 109.8% (toward MEAA in simulated urine) and 99.3 to 106.0% (toward TC in water), indicating the complex possesses acceptable reliability for monitoring the above two analytes in real samples.

Tetracycline hydrochloride degradation by activation of peroxymonosulfate with lanthanum copper Ruddlesden-Popper perovskite oxide: Performance and mechanism

ABO3-type perovskite oxides have been regarded as a kind of potential catalyst for peroxymonosulfate (PMS) activation. But some limitations such as specific pH conditions and coexisting ion interference restrict its practical application. Herein, a lanthanum copper Ruddlesden-Popper perovskite oxide (La2CuO4) was successfully synthesized through the sol-gel process and applied in the activation of PMS. And for the first time the La2CuO4/PMS system was used for tetracycline hydrochloride (TC-HCl) degradation. Results showed that La2CuO4 was a potential PMS activation catalyst in the removal of antibiotics. At optimized condition (0.2 g/L catalysts, 1 mM PMS, pH0 6.9), 96.05% of TC-HCl was removed in 30 min. In experiments of debugging control conditions, over a wide pH range of 3–11, more than 90% of TC-HCl can be removed. In the natural water treatment process, TC-HCl removal rates of about 84.2% and 70.3% were obtained in tap water and River water, respectively. According to the reusability and stability tests and the results of FTIR and XPS analysis, La2CuO4 had high structural and chemical stability. Electron paramagnetic resonance (EPR) suggested that the active species including ·OH, SO4−· and 1O2 were detected in degradation reaction. Finally, reasonable reaction mechanisms and possible degradation pathways of TC-HCl were proposed. These results indicate that La2CuO4 can act as a potential catalyst for PMS activation to degrade TC-HCl in water.

Waste to value transformation: Converting Carica papaya seeds into green fluorescent carbon dots for simultaneous selective detection and degradation of tetracycline hydrochloride in water

Rampant use of antibiotics has resulted in their seepage into groundwater and ultimately ending up in the food chain, causing antimicrobial resistance. To address this issue, it is imperative to not only quantitatively detect but eliminate them from water. An eco-friendly, one-step microwave-induced pyrolysis of waste papaya seeds (PS) with ethylenediamine (EDA) for just 5min gave green fluorescent nitrogen-doped carbon dots (PS-CDs), which are capable of detecting and photocatalytically degrading TC. The fluorescence properties of PS-CDs displayed that it has high sensitivity and selectivity towards sensing of TC with a detection limit as low as 120 nM. Also, the method gave satisfactory recovery results when extrapolated to determine TC in spiked milk, orange juice, tap water, and honey samples. On the other hand, PS-CDs alone potentially function as an efficient photocatalyst for the degradation of TC. PS-CDs' dual functionality provides an effectual method for the simultaneous detection and degradation of TC by a single nanoprobe.

Facile synthesis of nanostrip-structured pseudo-boehmite “nest” for nano-TiO2/γ-Al2O3 construction to remove tetracycline hydrochloride in water

A particular bird’s nest-like pseudo-boehmite (PB) composed of cohesive nanostrips was prepared by a novel and facile approach based on the reaction of Al–Ga–In–Sn alloy and water, together with ammonium carbonate. The PB possesses a large specific surface area (465.2 m2 g−1), pore volume (1.0 cm3 g−1), and pore diameter (8.7 nm). Subsequently, it was utilized as a precursor to form the TiO2/γ-Al2O3 nanocomposite for tetracycline hydrochloride removal. The removal efficiency can reach above 90% at TiO2:PB = 1:1.5 under the Sunlight irradiation simulated by a LED lamp. Our results indicate that the nest-like PB is a promising carrier precursor for efficient nanocomposite catalysts.

Anchoring TiO2@CsPbBr3 on g-C3N4 nanosheet for enhanced photocatalytic degradation activity of tetracycline hydrochloride

The development of catalysts for efficient photocatalytic antibiotic residue degradation has received considerable attention. Herein, we report the effective preparation of an innovative g-C3N4-TiO2@CsPbBr3 composite by anchoring TiO2@CsPbBr3 on the surface of g-C3N4. An investigation was undertaken to determine the microstructure, electrochemical and optical characteristics of the photocatalyst as well as its ability to degrade tetracycline hydrochloride in water. The experimental results demonstrated increased light-harvesting capability and more efficient charge carrier separation was achieved for the as-prepared g-C3N4-TiO2@CsPbBr3 catalyst. Consequently, the sample displayed outstanding photocatalytic performance for the degradation of tetracycline hydrochloride. Its degradation rate reached 75.6 % in 120 min, which is 2.30 and 2.03 times that of TiO2@CPB and pure g-C3N4. Moreover, it was discovered that •O2− is the dominant active specie in the photocatalytic degradation process. Based on the results, a possible photocatalytic mechanism for the degradation of tetracycline hydrochloride was described in detail. This research inspires the construction of CsPbBr3-based photocatalysts and broadens their applications in tetracycline degradation.

Al3+ doped CuFe2O4 efficiently activates peroxymonosulfate for long-term and stable degradation of tetracycline: Synergistic and regulatory role of Al3+

The water pollution caused by the proliferation of tetracycline hydrochloride (TC) has seriously harmed human beings and the environment. Therefore, it is necessary to design a catalyst that can effectively remove TC and immobilize it for practical applications. Spinel catalysts can effectively resolve the problem of TC contamination in water. In this research, in order to solve the problems of poor dispersion, inferior performance and weak stability of copper ferrate (CuFe2O4). Al3+-doped CuFe2O4 was prepared by the one-step sol–gel-combustion method and used as a peroxymonosulfate (PMS) activator to promote the degradation of tetracycline (TC). A series of degradation experiments and characterization indicated that Al3+-doped CuFe2O4 could remove more than 95 % of TC within 20 min, its first-order kinetic degradation constant was 2.5 times higher than that of CuFe2O4. The mechanism by which Al3+ could improve the degradation of CuFe2O4 may be as follows: the presence of Al3+ increased the electron transfer rate of the metal; effectively increased the specific surface area of the catalyst, provided more active sites; the Al-O-Fe and Al-O-Cu bonds generated by Al3+ immobilized the highly reactive metal ions, reducing ion leaching and improving the stability of the catalyst. Electron paramagnetic resonance and quenching experiments identified the synergistic effect of both radicals and non-radicals in the reaction. Electrochemistry and X-ray photoelectron spectroscopy (XPS) further verified the possible catalytic mechanism. Furthermore, by further immobilization, the 1 g of catalyst could continuously degrade 9 L of TC in water without stirring, showing excellent practical applications. This work provides a reference for improving the catalytic performance of ferrite spinel materials and solving the difficult problem of catalyst recovery in the real environment.

A novel BC/g-C3N4 porous hydrogel carrier used in intimately coupled photocatalysis and biodegradation system for efficient removal of tetracycline hydrochloride in water

Intimately coupled photocatalysis and biodegradation (ICPB) is a promising technology to remove refractory contaminants from water. The key to successful ICPB is a carrier capable of accumulating biofilm and adhering photocatalyst firmly. Herein, BC/g-C3N4 was prepared into a three dimensional porous hydrogel and used as a carrier in ICPB system for the first time. Degradation experiments revealed that the removal rate of tetracycline hydrochloride (TCH) in water by the ICPB system was 96.0% after 10 h, which was significantly higher than that by the photocatalysis (PC, 76.3%), biodegradation (B, 32.5%), adsorption (AD, 17.2%), and photolysis (P, 5.0%) systems. Photo-electrochemical tests confirmed that ICPB system had superior electron transfer ability between photocatalysts and microorganisms. The removal efficiency of COD proved that microorganisms played an important role in the mineralization process of TCH by the ICPB system. After the ICPB degradation experiment, microorganisms maintained high activity and Pseudomonas, Burkholderiaceae and Flavobacterium which had TCH degradation or electron transport ability, were enriched. In conclusion, the novel ICPB carrier overcame shortcomings of the traditional ICPB carrier and the novel ICPB system had superior degradation performance for TCH. This study provided a possible method to promote the practical application of ICPB technology.

Highly Efficient Degradation of Tetracycline Hydrochloride in Water by Oxygenation of Carboxymethyl Cellulose-Stabilized FeS Nanofluids.

The transformation of organic pollutants by stabilized nano-FeS in oxic conditions is far less understood than in anoxic states. Herein, carboxymethyl cellulose-stabilized FeS (CMC-FeS) nanofluids are prepared at a CMC-to-FeS mass ratio of 1/2 and their performance of tetracycline hydrochloride (TC) degradation under oxic conditions was investigated. Here, we showed that TC could be efficiently removed by oxygenation of CMC-FeS nanofluids at neutral initial pH. We found that CMC-FeS dosages as low as 15 mg/L can achieve the TC removal efficiency as high as 99.1% at an initial TC concentration of 50 mg/L. Oxidative degradation plays a predominated role in TC removal (accounting for 58.0%), adsorption has the second importance (accounting for 37.0%), and reduction has minor impact (accounting for 4.1%) toward TC removal. Electron spin resonance assays, fluorescent detection using coumarin as a probe, and radical scavenging experiments confirm that hydroxy radicals (•OH), both in free and surface-bound forms, contribute to oxidation of TC. Humic acids brought detrimental effects on TC removal and therefore should be biologically degraded in advance. This work offers a facile and cost-effective solution to decontaminate TC in natural and engineered water bodies.

Construction of hydrostable cesium lead bromide-titania for visible-light degradation of tetracycline hydrochloride in water

The poor stability of metal halide perovskite in water is one of the main obstacles restricting its practical application. Hydrostable cesium lead bromide-titania heterojunction was synthesized by the solvothermal method with the following sintering process and applied for the visible-light-driven photodegradation of tetracycline hydrochloride (TC-HCl) in water. The introduced TiO 2 components effectively protect CsPbBr 3 nanoparticles from phase transition which spurs significantly improved photocatalytic performance and stability on CsPbBr 3 –TiO 2 heterojunction in water. The structure of synthesized CsPbBr 3 –TiO 2 photocatalyst is characterized by XRD , SEM, and TEM . The photoelectric characteristics of prepared photocatalysts investigated through photoelectrochemical and photoluminescent analyses indicate that the enhanced photocatalytic property may be related to the optimized light response and electron-hole separation on heterojunction composites. The active substances in the photocatalytic process are determined through capture experiments, indicating that holes (h + ) and superoxide radicals (• O 2 − ) are responsible for photocatalytic activity . A reaction mechanism is suggested in the end. This work provides an alternative for the construction of water-resistant halide perovskite to break through the poor water stability and opens novel applications for halide perovskite-based materials in aqueous environmental control. Hydrostable CsPbBr 3 –TiO 2 composite has been successfully prepared by solvothermal method, which shows enhanced photocatalytic performance for visible-light degradation of tetracycline hydrochloride in an aqueous system with good stability. • Hydrostable CsPbBr 3 –TiO 2 composite is synthesized by solvothermal method. • CsPbBr 3 –TiO 2 shows prominent visible-light photodegradation of aqueous TC-HCl. • The photocatalytic activity and water resistance are related to CsPbBr 3 /TiO 2 ratios.

GNR@CeO2 heterojunction as a novel sonophotocatalyst: Degradation of tetracycline hydrochloride, kinetic modeling and synergistic effects

Tetracycline hydrochloride (TCH) is an antibiotic whose presence in aqueous environments, even in trace concentrations, is unsafe for living beings. This work reports the fabrication of a promising sonophotocatalyst, graphene nanoribbon-cerium oxide (GNR@CeO2) heterojunction, for the UV-light driven sonophotocatalytic degradation of TCH. First, GNR@CeO2 heterojunction was fabricated by the simple sonication assisted 1:1 (w/w) doping of cerium oxide (CeO2) nanomaterial onto graphene nanoribbons (GNRs) surface. Further, the GNR, CeO2 and GNR@CeO2 heterojunctions (20 mg L−1 each) were separately investigated as catalysts in the sonocatalytic (40 kHz ultrasound), photocatalytic (390–400 rpm, UV: 365 nm) and sonophotocatalytic (40 kHz ultrasound, 390–400 rpm, UV: 365 nm) processes for the degradation of TCH (70 mL of 20 mg L−1stock). Among the treatment modes, the GNR, CeO2 and GNR@CeO2 heterojunction catalyzed sonophotocatalytic modes recorded the highest TCH removals with 72.9%, 68.3% and 91.2% respectively in 120 min duration. Degradation rates and dynamics obeyed pseudo-first-order kinetics in all the treatment modes. However, GNR@CeO2 catalyzed sonophotocatalytic mode showed the highest degradation rate with the rate constant k = 0.0290 min−1 and correlation coefficient R2 = 0.999, suggesting that the proposed heterojunction acts as effective sonophotocatalyst. The synergy index calculated from the kinetic data also suggests excellent inter-process and inter-catalyst synergy for GNR@CeO2 catalyzed sonophotocatalytic mode. Further, GNR@CeO2 heterojunction also showed high reusability and stability in the sonophotocatalytic process, suggesting that the heterojunction coupled with ultrasound and UV-light serve as practically reliable decontamination system for the removal of TCH in water and wastewaters.

Controllable Synthesis of Iron-Introduced Cobalt-Iron Bimetallic Mofs for Rapid Removal of Tetracycline Hydrochloride in Water

Controllable Synthesis of Iron-Introduced Cobalt-Iron Bimetallic Mofs for Rapid Removal of Tetracycline Hydrochloride in Water

2D/2D SnS2@Ti3C2 MXene heterojunction photocatalyst with a superior efficiency for tetracycline hydrochloride elimination

In this work, two-dimension (2D) SnS2@Ti3C2 MXene heterojunction was constructed by in-situ hydrothermal growing method. Ti3C2 MXene with unique stratified structure could provide plenty of proper sites for 2D SnS2 nanosheets (200–500 nm). The numerous heterojunctions acted as the highly efficient separating channels of photogenerated electron on the SnS2@Ti3C2 photocatalyst. Therefore, the 2D SnS2@Ti3C2 nanocomposite had the higher efficiency than pure 2D SnS2 for tetracycline hydrochloride degradation, which could photocatalytic degrade 96% tetracycline hydrochloride in water during 60 min. On the other hand, the strong interaction on heterostructure interfaces guaranteed the terrific stability of the SnS2@Ti3C2 photocatalyst.

Synergistic adsorption and advanced oxidation activated by persulfate for degradation of tetracycline hydrochloride using iron-modified spent bleaching earth carbon.

At present, tetracycline hydrochloride (TCH) is a widely used antibiotic, and is often detected in water, posing a serious harm to human and ecological health. In this study, spent bleaching earth (SBE) was pyrolyzed to obtain spent bleaching earth carbon (SBE@C) and the nano Fe0/SBE@C prepared after zero-valent iron loading was adopted to remove TCH in water for the first time. The combination of nano Fe0/SBE@C and PS, the strong adsorption of SBE@C coupled with the oxidation of free radicals could achieve TCH efficient removal. The effects of nano Fe0 load, nano Fe0/SBE@C dosage, solution initial pH, and PS/TCH molar ratio on TCH removal efficiency in nano Fe0/SBE@C + PS system were studied. The results indicate that the optimal reaction conditions are 5% nano Fe0 load, 0.2g/L nano Fe0/SBE@C dosage, initial pH of 3, PS/TCH molar ratio of 100:1. Under these conditions, TCH removal efficiency could reach 91%. Meanwhile, response surface methodology (RSM) was applied to predict optimal value of reaction conditions. The removal efficiency corresponding to the predicted optimal conditions was consistent with the actual removal efficiency obtained from the experiment. Moreover, six reaction systems were tested, and TCH removal efficiency in the SBE@C + PS system was 22.6%. When nano Fe0 was loaded on SBE@C, TCH removal efficiency in Fe0/SBE@C + PS system increased to 78.2%, in which TCH was first adsorbed on the surface of nano Fe0/SBE@C, and then was degraded by the oxidation of SO4•- and •OH. Totally, the nano Fe0/SBE@C + PS system displayed excellent TCH removal efficiency, good stability and reusability, exhibiting a promise toward TCH removal.

Magnetic porous biochar as a renewable and highly effective adsorbent for the removal of tetracycline hydrochloride in water.

In this study, discarded cigarette butts were used as a precursor for preparing magnetic porous biochar with a facile annealing method. The magnetic porous biochar was applied to remove tetracycline hydrochloride (TCH) from aqueous solution. It exhibited excellent adsorption capacity for TCH, which was much higher than various similar materials reported. At the same time, the adsorption kinetics and adsorption isotherms of TCH were well fitted to the pseudo-second-order models and Freundlich models, respectively. The thermodynamics experiments proved that the adsorption on magnetic porous biochar was an endothermic reaction. Furthermore, the adsorption mechanism was explored, and the outstanding adsorption ability was mainly dependent on the pore filling effect, electrostatic interaction, and π-π interaction. By using the magnetic porous biochar, the real water samples were treated and high removal efficiency to TCH was obtained. What's more, the excellent reusability endowed the magnetic porous biochar with great potential as adsorbents for practical application.

Ultrasmall Ag species decorated on α‐Fe2O3 nanorods toward high‐efficient photocatalytic degrading tetracycline hydrochloride in water

AbstractThe ultrasmall Ag species decorated on α‐Fe2O3 nanorods photocatalysts are prepared through a facile in situ photodeposition process. The obtained Ag/α‐Fe2O3 composite samples display more outstanding photocatalytic activity than original α‐Fe2O3 in the degradation of tetracycline hydrochloride (TC‐HCl) in water. The degradation rate constant of TC‐HCl over the Ag/α‐Fe2O3‐5 sample reaches up to 0.0118 min−1, which is about 6.21 times than that over original α‐Fe2O3 sample (0.0019 min−1). The structure characterizations, physicochemical properties, and photoelectrochemical measurements reveal that the visible light absorption ability and charge separation efficiency are improved dramatically owing to the decoration effect of ultrasmall Ag species on the surface of α‐Fe2O3 nanorods. The photocatalytic reaction mechanism investigations demonstrate that holes, ˙O2−, and ˙OH all are main active species and play important roles in the degradation process of TC‐HCl.