MOLECULES
·
2019
·Vol. 24
·期 24
·4534
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IF 3.06
Yixin Cai,Liming Liu,Huafeng Tian,Zhennai Yang,Xiaogang Luo
Adsorption and desorption behaviors of tetracycline hydrochloride by activated carbon-based adsorbents derived from sugar cane bagasse modified with ZnCl2were investigated. The activated carbon was tested by SEM, EDX, BET, XRD, FTIR, and XPS. This activated carbon exhibited a high BET surface area of 831 m2g−1with the average pore diameter and pore volume reaching 2.52 nm and 0.45 m3g−1, respectively. The batch experimental results can be described by Freundlich equation, pseudo-second-order kinetics, and the intraparticle diffusion model, while the maximum adsorption capacity reached 239.6 mg g−1under 318 K. The effects of flow rate, bed height, initial concentration, and temperature were studied in fixed bed adsorption experiments, and adsorption data were fitted with six dynamic adsorption models. The results of characterizations and the batch experiments were analyzed to study the adsorption and desorption mechanisms. Tetracycline hydrochloride and activated carbon were bonded together by π–π interactions and cation–π bonds. Ethanol was used as an eluent which bonded with 10 hydrogen bond acceptors on tetracycline hydrochloride to form a complex by hydrogen bonding to achieve recycling.Keywords:adsorption;desorption;mechanism;sugar cane bagasse;activated carbons;tetracycline
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
You Wu,Yuqi Li,Huan Li,Hai Guo,Qi Yang,Xiaoming Li
Cu 2 O is an attractive material for the architectural design of integrated nanomaterials in photocatalysis. Herein, a contrastive study was carried out to explore the influence of morphology/exposed Cu 2 O facets on the template growth process and the difference of fabricated composites in photocatalysis performance. A series of Cu 2 O@HKUST-1 with core–shell structure was developed via a self-confinement strategy, in which Cu 2 O nanocrystals with various shapes (cube, truncated octahedron and octahedron) act as self-confinement template to grow Cu-based metal–organic frameworks (HKUST-1) shell. It was revealed that the growth of HKUST-1 on Cu 2 O crystal depended on the original Cu 2 O crystal. The exposure of (1 1 1) facet in Cu 2 O was more favorable to the growth of HKUST-1 than (1 0 0) crystal plane. Optical and photoelectrochemical characterizations revealed that the cubic Cu 2 O@HKUST-1 exhibited the outstanding light response and most efficient interfacial charge transfer and separation among three types of composites. As a result, the degradation rates of tetracycline hydrochloride (TC-HCl) by cubic Cu 2 O@HKUST-1 under the visible light irradiation was 95.35% within 60 min, which was much higher than truncated octahedral Cu 2 O@HKUST-1 (78.81%) and octahedral Cu 2 O@HKUST-1 (66.58%). Mechanism explorations including radical capture experiments, electron paramagnetic resonance and band structure analysis showed that type II heterojunction was formed in cubic Cu 2 O@HKUST-1 and truncated octahedral Cu 2 O@HKUST-1, which was conducive to the separation and transfer of photo-generated carriers. However, type I heterojunction existed in octahedral Cu 2 O@HKUST-1 lead to the recombination of photocarriers. These findings revealed the interface-dependent photocatalytic performance in Cu 2 O@HKUST-1 and provided useful guidance for controllable construction of photocatalysts with heterojunction structure.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 17
·24704-24715
·
IF 4.223
Chen Yue,Shi Yahui,Wan Dongjin,Zhao Jihong,He Qiaochong,Liu Yongde
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 Fe 0 /SBE@C prepared after zero-valent iron loading was adopted to remove TCH in water for the first time. The combination of nano Fe 0 /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 Fe 0 load, nano Fe 0 /SBE@C dosage, solution initial pH, and PS/TCH molar ratio on TCH removal efficiency in nano Fe 0 /SBE@C + PS system were studied. The results indicate that the optimal reaction conditions are 5% nano Fe 0 load, 0.2 g/L nano Fe 0 /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 Fe 0 was loaded on SBE@C, TCH removal efficiency in Fe 0 /SBE@C + PS system increased to 78.2%, in which TCH was first adsorbed on the surface of nano Fe 0 /SBE@C, and then was degraded by the oxidation of SO 4 •− and •OH. Totally, the nano Fe 0 /SBE@C + PS system displayed excellent TCH removal efficiency, good stability and reusability, exhibiting a promise toward TCH removal.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
CHEMICAL PHYSICS LETTERS
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2025
·
IF 3.1
Simin Li,Ziran Chang,Fengbing Tang,Tianshuo Sui,Lemin Li,Jingbo Mu,Zhennan Shi
The QS@PDA/Co-Mn-ZIF catalyst, synthesized using quartz sand as a base material, effectively degrades TCH through the activation of PMS. The Co-Mn-ZIF component activates PMS, while PDA ensures the adhesion of ZIF to quartz, facilitating catalyst recovery. This design enhances electron transport and metal ion redox reactions, generating reactive species that degrade TCH. It achieves a 94 % TCH removal rate from a 100 mg/L solution within 40 min, demonstrating stability under various pH and water conditions. The catalytic mechanism was elucidated·through radical trapping experiments and electron paramagnetic resonance analysis. QS@PDA/Co-Mn-ZIF shows great potential for treating recalcitrant and high-concentration organic wastewater.
研究领域:
环境科学
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催化化学
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DOI
高影响因子
CHEMOSPHERE
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2021
·
IF 7.086
Zhi-Peng Ma,Linnan Zhang,Xue Ma,Yu-Hang Zhang,Fa-Nian Shi
High electron transfer rates and a higher number of electron transfer active sites play important roles in inhibiting the recombination of photogenerated electron-hole pairs. In the experiments described in this article, the g-C 3 N 4 /BC/Bi 25 FeO 40 composite material was prepared to use biochar (BC) as the conductive channel. The presence of BC significantly increases the electron transfer rate due to its excellent electrical conductivity and can provide more electron transfer active sites. At the same time, BC provides a larger surface area and has a loose porous structure, which lead to excellent adsorption performance. Based on various characterization results, it was confirmed that the Z-scheme heterojunction was successfully constructed between g-C 3 N 4 and Bi 25 FeO 40 . The photocatalytic experiment results showed that the degradation efficiency of g-C 3 N 4 /BC/Bi 25 FeO 40 on the tetracycline hydrochloride (TCH) could reach 92.2% within 60 min. Parameters such as circulation stability, pH value of the solution and the amount of composite materials were studied. The synthesized composite material has good reusability and high efficiency in a wide pH range of 3–11. Its excellent photocatalytic activity is attributed to the formation of an effective Z-scheme heterostructure, as well as the rapid photoelectron transfer and excellent adsorption capacity of BC. This work provides a way to design new photocatalysts using semiconductor composite materials and BC materials.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Lijun Gao,Dongmei Han,Zhihua Wang,Fubo Gu
Tubular carbon-covered cobalt-doped bi-crystalline phase In 2 O 3 (denoted as CoInO-x) was synthesized by one-step calcination of the metal-organic framework cobalt-doped MIL-68(In)-NH 2 precursor. The photocatalytic activity of CoInO-x was investigated using tetracycline hydrochloride (TCH) degradation. The removal of TCH by CoInO-500 obtained by calcination at 500 °C under visible light irradiation was 90.1% after 70 min, which was significantly higher than that of In 2 O 3 . The reaction rate constant of CoInO-500 was 11.02 times higher than that of In 2 O 3 and could maintain a better photocatalytic performance after four cycles. The effects of photocatalyst dosing, pH, and inorganic anions on photocatalytic degradation were studied. The mechanism of photocatalytic degradation was analyzed in detail by reactive radical trapping experiments, Mott-Schottky measurements, and electron paramagnetic resonance (EPR) signal characterization. Enhanced photocatalytic performance is mostly attributed to the cobalt doping creating impurity energy levels and narrowing the forbidden bandwidth of In 2 O 3 , enhancing the visible light utilization and the photogenerated charge separation efficiency. Carbon covering can serve as a bridge for charge transport, accelerating the rapid transport of photogenerated charges.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
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2024
·
IF 6.3
Jianan Dai,Chao Wu,Jing Ma,Shu-Hao Chang,Weiwei Liu
The conventional heterojunction formed by combining two different semiconductors is associated with issues of low compatibility, restricted intimate contact, and limited charge anti-recombination process. To address these issues, a simple strategy was adopted to fabricate a hetero-phase junction flanked with two dissimilar crystal phases of a single semiconducting material . This study employed TiB 2 as the initial material to fabricate an anatase/rutile TiO 2 hetero-phase junction material (AR-TiO 2 ), followed by its combination with highly conductive monolayer Ti 3 C 2 nanosheets to develop an AR-TiO 2 /Ti 3 C 2 composite photocatalyst . The photocatalyst displayed a wide range of light absorption and a remarkable capability for separating photogenerated carriers. The closely interconnected hetero-phase junction surface, formed by the rutile and anatase phases of AR-TiO 2 , combined with the incorporation of highly conductive Ti 3 C 2 nanosheets , synergistically increased the availability of multi-dimensional active sites and increased the efficacy of separating photogenerated electron pairs. The optimized AR-TiO 2 /Ti 3 C 2 achieved a degradation efficiency of 91.49 % for tetracycline hydrochloride (TCH) within 2 h and produced 1005.81 μmol of hydrogen in 6 h. The impacts of initial pH, co-existing anions, initial TCH concentration, initial temperature, and various pollutant species on the catalytic efficiency were also investigated. pH was shown to have the greatest impact on the photocatalytic performance of AR-TiO 2 /Ti 3 C 2 for TCH degradation. •O 2 − , and h + were identified as the primary reactive species that enabled the photocatalytic performance of AR-TiO 2 /Ti 3 C 2 through trapping experiments. This study presents a novel method to synthesize hetero-phase junction photocatalysts and suggests that Ti 3 C 2 has potential prospects for use in photocatalysis .
研究领域:
材料科学
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环境科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 21
·10191-10200
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IF 3.925
Fang-Di Wu,Jyh-Cherng Chen,Zi-Tao Yang
A C/Ho co-doped TiO2 catalyst was prepared by the precipitation–calcination method using Ti3C2Tx as the precursor and carbon source. X-ray diffractometry, transmission electron microscopy, X-ray photoelectron spectroscopy, N2 adsorption–desorption isotherms, UV-Vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, and photoelectrochemical measurements were used for characterization. The C doped anatase TiO2 prepared by calcining Ti3C2Tx maintained the two-dimensional lamellar structure of the Ti3C2Tx precursor, and the carbon dopant was present on the surface of TiO2 in the form of C–O and CO, whereas Ho3+ was mainly doped into the lattice of TiO2, forming Ho–O bonds with oxygen instead of Ti4+. The band gap of the C/Ho co-doped TiO2 photocatalyst was reduced as compared to that of pristine TiO2, which can improve the utilization efficiency of visible light. When the doping ratio of Ho was 5% (CHT-0.05), the photocatalyst had the highest photocurrent and degradation efficiency of tetracycline hydrochloride (86.4%). The reaction mechanism for the photocatalytic degradation of TCH by the C/Ho co-doped TiO2 photocatalyst was investigated and showed that superoxide radicals (˙O2−) and holes (h+) were the main species that influenced the results. The prepared photocatalyst had good catalytic performance over four cycles, and it was stable and suitable for wastewater treatment.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
S. Gong,W. Lu,W. Zhang,Y. Zhang,T. Gan,H. Hu,Z. Huang
Poor visible light (VSL) absorption capacity and severe photogenerated carrier recombination rate are the two major problems limiting the application of g-C 3 N 4 (CN). In this work, a novel 2D/1D Bi 2 O 2 Se/tubular g-C 3 N 4 (TCN) Schottky junction photocatalyst was prepared by combining 2D Bi 2 O 2 Se with TCN at room temperature. The degradation rate of tetracycline hydrochloride (TCH) catalyzed by 5% Bi 2 O 2 Se/TCN composite was 85.3% within 30 min under VSL illumination, and the degradation kinetic constant reached 0.0570 min −1 , which was 9.6, 3.3, and 21.9 times higher than those of CN (0.0059 min −1 ), TCN (0.0173 min −1 ), and Bi 2 O 2 Se (0.0026 min −1 ), respectively. When 2D Bi 2 O 2 Se was combined with TCN as a cocatalyst, the Schottky junction was formed at the interface, which could efficiently transfer the photogenerated electrons in TCN to Bi 2 O 2 Se for enhancing photocarriers separation. In addition, Bi 2 O 2 Se enhanced the VSL light absorption performance of TCN. The main active species produced by Bi 2 O 2 Se/TCN under VSL illumination were h + and •O 2 − . Based on the results of LC-MS, a new degradation path of TCH catalyzed by Bi 2 O 2 Se/TCN was proposed. Therefore, this work proposed a novel Bi 2 O 2 Se/TCN Schottky junction photocatalyst for highly efficient removal of TCH.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Wenbin Li,Zhijian Zhou,Zhili Chen,Li Chen,Jin Tang,Lizhao Zhang
In this study, a new adsorbent denoted as nAg/nZVI/AC was developed using activated carbon (AC) loaded with nanosized zero-valent iron (nZVI) and nanosilver (nAg). Then, the adsorption and degradation of tetracycline hydrochloride (TCH) in aqueous solutions using nAg/nZVI/AC was examined. At pH 3.8, the adsorbed amount of TCH on nAg/nZVI/AC was 191.18 mg/g, which is 78.95 mg/g higher than that adsorbed on the pristine AC support. The adsorption process could be explained adequately using the Freundlich (R 2 = 0.9641) and pseudo-second-order kinetic models (R 2 = 0.9967). Thermodynamic analyses revealed that TCH removal is a spontaneous chemisorption-dominated process. Free-radical-quenching experiments and electron paramagnetic resonance spectroscopic studies revealed that hydroxyl (·OH) and superoxide (·O 2 − ) radicals are the main species involved in the degradation of TCH. Finally, the intermediates generated during the degradation were examined using liquid chromatography-mass spectrometry, and possible deterioration pathways are proposed.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2021
·Vol. 70
·期 9
·1396-1403
·
IF 2.99
Tingxiao Li,Yifan Huang,Lei Wang,Binjie Xin
A bead-on-string structure with special beads at the microscale level could act as an effective carrier for solid drug particles as well as giving a continuous and sustained release profile. Tetracycline hydrochloride (TCH), used as solid model drug particles, was ground to obtain nanoscale and well-distributed size. Electrospun poly[lactic- co -(glycolic acid)] (PLGA) bead-on-string nanofibers loaded with TCH of different particle sizes were fabricated for controlled drug delivery. The morphology of TCH particles and bead-on-string nanofibers were observed using a particle sizer and scanning electron microscopy. The effects of drug particle size on the release behaviors of nanofibers were further investigated and analyzed using UV–visible spectrophotometry. In vitro release results suggested that bead-on-string nanofibers encapsulating ground TCH particles had higher total drug release quantity compared with unground particle-loaded nanofibers. Coating of the surface of PLGA/TCH nanofibers was investigated for controlled-release effects and the release mechanism to understand the drug–polymer carrier interaction. The results indicated that coating on both sides of nanofibrous membranes could effectively decrease the initial burst release. Bead-on-string nanofibers proved to be promising mats for drug delivery applications. © 2021 Society of Industrial Chemistry.
研究领域:
生物材料学
·
药剂学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Chi Fei,Zaocheng Dong,Houqi Zhou,Ting Xu,Keying Tang,Yilong Fan,Chunyu Chen,Dianchun Ju,Zuoqiao Zhu,Han Ma,Rui Mao
A “waste-to-waste” strategy was adopted by pyrolyzing waste sugarcane bagasse to synthesize biomass-derived carbon (AC) and utilizing diatomite (DTE) as a substrate to construct a high-performance three-dimensional carbon–silica-based bismuth oxychloride (AC-DTE@BiOCl) photocatalyst. The three-dimensional structure effectively prevents the agglomeration of BiOCl while providing additional active sites. Experimental results demonstrate that AC-DTE@BiOCl efficiently degrades 96.2 % of tetracycline hydrochloride (TCH) within 90 min, exhibiting excellent photocatalytic performance. Infrared spectroscopy analysis reveals that the symmetric stretching vibration peak of Si-O (804 cm −1 ) weakens and slightly broadens, while no characteristic peaks of TCH are detected, indicating its complete degradation. Density functional theory (DFT) calculations indicate that the carbonyl site in the TCH molecule exhibits the highest negative electrostatic potential, and O2, O4, O7, N1, O6, and O3 atoms are identified as the primary active sites for radical attack. Furthermore, the photocatalytic degradation of TCH mainly proceeds through hydroxylation, deamination, and ring-opening pathways. These findings provide valuable insights into the rational design and development of high-efficiency and stable photocatalytic materials for environmental remediation applications.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）