International Journal of Chemical Reactor Engineering
·
2025
·
IF 1.4
Huan Xi,Lu Wang,Haimeng Huang
Antibiotics in water body pose a threat to the ecosystem and human health, and the removal of antibiotics in water is imperative. Ti 3 C 2 T
x
has high specific surface area and structural stability, but suffers from low catalytic activity and insufficient utilization of active sites. In this paper, Ti 3 C 2 T
x
/Bi 2 S 3 composites (named PTB and STB, respectively) were prepared by in situ synthesis and physical composite method. The introduction of Bi 2 S 3 extends the light absorption of the composites to the visible region. Meanwhile, the electron migration resistance in PTB is smaller and the photoresponse current is larger. PTB exhibited better adsorption-photocatalytic performance than STB and pure Ti 3 C 2 T
x
, with a removal efficiency of 89 %. In addition, the study investigated the effects of water quality parameters and proposed a possible photocatalytic mechanism. Finally, the tetracycline adsorption and photocatalytic performance of PTB in real water samples showed good results, especially in lake water and tap water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Sihan Ma,Xian Luo,Guang Ran,Yipeng Li,Ziqi Cao,Xinyi Liu,Guoqiang Chen,Jianghua Yan,Lin Wang
Optical antibacterial agents present great potential in eliminating infectious pathogens. It is of great significance to construct effective photonic antibacterial agents with outstanding light absorption properties. Herein, 2D engineering defect nanosheets BiOI/Bi with Bi decoration and defect engineering (BiOI-DE) are constructed to perform photonic sterilization. On the one hand, the rational designed BiOI-DE can effectively promote the broad-spectrum light absorption ability to enhance the light utilization rate. On the other hand, the substantive structure can simultaneously harvest the enhanced photonic carriers and thermal effect when irradiated with high penetration ability NIR, further exhibiting higher activity in killing Escherichia coli (E. coli) than that of single BiOI with poor light absorption. The sterilization efficiency is over 99%. Moreover, the causes of the photothermal effect are discussed, indicating that the change of BiOI bandgap and surface bismuth decoration displays a critical role in enhancing light absorption and creating heat energy. In the meantime, the structural advancement of BiOI-DE effectively improves the photocatalytic activity, the synergistic photothermal-catalytic process establishes a favorable condition for improving antibacterial performance. This system provides rational design and potential inspiration for high efficient antibacterial strategy by employing defect engineering approaches.
研究领域:
材料科学
·
生物医学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 10
·4507-4520
·
IF 2.7
Luhua Wang,Yi Ren,Hongfang Zhao,Hongxia Li,Xiaohui Niu,Deyi Zhang,Haiyan Fan,Kunjie Wang
To address the water pollution problem caused by hexavalent chromium, this study took advantage of a multi-defect adsorption mechanism and constructed a multiple defect-containing type-II heterojunction material, CuS/Cv-CNNs. This material has simultaneous sulfur vacancies, copper vacancies, and carbon vacancies, which were used to accelerate the removal of chromium from wastewater. Attributed to the formation of electron-rich structures and free-moving ions by the construction of multiple defect sites, the photogenerated carriers generated by CuS/Cv-CNNs-70 were efficiently separated, and a high amount of physical Cr(VI) adsorption was achieved by electrostatic attraction and ion exchange, consistent with a Freundlich isothermal adsorption model. Studies on the adsorption thermodynamics demonstrate that CuS/Cv-CNNs-70 prefers to adsorb Cr(VI) when temperatures are raised. In addition, the removal of Cr(VI) (120 mg L−1) by CuS/Cv-CNNs-70 reached 97.10% after 60 minutes through the synergistic effect of adsorption and visible-light photocatalysis. This finding indicates that the synergistic effect between the multilocation defects stimulated the combined potential of adsorption and photocatalysis of CuS/Cv-CNNs-70 to realize the full utilization of the defects. In conclusion, this study confirms the prominent role of a multiple defect mechanism in wastewater treatment and environmental protection.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2019
·
IF 3.683
Jie Chen,Yan Xiong,Ming Duan,Xiang Li,Jun Li,Shenwen Fang,Sha Qin,Run Zhang
The adsorption of dye molecules is an important process for the photodegradation removal of dye pollutants. In this work, a semiconductor photocatalyst of Cr-doped ZnO nanorods (Cr–ZnO NRs) was synthesized, and its adsorption–photocatalysis synergy (APS) effect was investigated for anionic methyl orange (MO–) and cationic methylene blue (MB+). The detailed thermodynamic information (including adsorption maximum capacity qmax, adsorption equilibrium constant Kads and adsorption efficiency AE %) and dynamic information (including adsorption rate constant ka, degradation rate constant kd and degradation efficiency DE %) were obtained to evaluate the different reaction performances for MO– and MB+. With qmax(MB+) = 40.59 mg g–1 > qmax(MO–) = 15.95 mg g–1, ka(MB+) = 20.61 min–1 > ka(MO–) = 4.62 min–1, and AE(MB+) = 40% > AE(MO–) = 9%, Cr–ZnO NRs showed much superior adsorption performance for MB+ than MO–. With kd (MB+) = 0.0430 min–1 > kd (MO–) = 0.0014 min–1 and DE(MB+) = 98% > AE(MO–) = 20%, Cr–ZnO NRs also showed much superior photodegradation performance for MB+ than MO–. The APS mechanism of Cr–ZnO NRs is revealed to be multiple π–π interactions and stronger electrostatic attractions dominant for enhanced adsorption of MB+ and higher AE and more photocatalytic active species dominant for enhanced photodegradation of MB+. The APS was furthermore characterized and verified by zeta potential analysis, Fourier transform infrared investigation, and fluorescence imaging. The results indicate that Cr–ZnO NRs are promising adsorbent and photocatalyst candidates favorable for positive MB+ than negative MO–. Such an APS investigation can effectively help to improve the photodegradation treatment performance of photocatalysts for dye pollutant removal.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 7
·1-18
·
IF 2.8
Du Ze,Li Yanmei,Kuang Daihong,Wang Wenquan,Yang Fangyuan,Yang Jiadong,Hou Liang
BiFeO 3 @GO nanocomposite fibers were successfully synthesized by the electrospinning and simple ultrasound method. The structure, morphology, optical, composition and magnetic properties of BiFeO 3 @GO samples were characterized by XRD, FT-IR, SEM, TEM, UV–Vis and XPS analyses. The results showed that the removal of organic dye pollutants was enhanced by novel BiFeO 3 @GO fibers through the adsorption–photocatalytic synergy. The removal rates of methylene blue (MB), Congo red (CR), Rhodamine B (RHB) and norfloxacin (NOR) dyes were increased by 64.5%, 33.6%, 43% and 61.1%, respectively. Then it was a benefit to remove MB when the pH is between 6.0 and 10.0, while it was favorable for adsorption in a neutral environment and photocatalysis in an acidic or alkaline environment. The adsorption process of MB dyes was more in line with the pseudo-second-order kinetic model for BiFeO 3 @GO nanocomposite sample with 3 mg graphene oxide weight (GO 3 ). The adsorption data were well fitted by Langmuir adsorption isotherm, which indicated that the adsorption process was a monolayer adsorption. The adsorption of MB dyes on GO 3 nanocomposite fibers appeared to be a favorable process (0 < R L < 1). Moreover, the trapping experiments showed that · OH was the main active substance during photocatalysis, and the FT-IR tests indicated that nanocomposite fibers can degrade MB into CO 2 and H 2 O under the synergistic effect of adsorption and catalysis.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yingjie Guo,Jiayi Yan,Zan Chen,Cuijia Duan,Claudia Li,Yinhui Li,Sibudjing Kawi
The tendency of small-sized covalent organic framework (COF) nanoparticles to easily agglomerate, and the propensity of photo-generated carriers in α -Fe 2 O 3 to recombine pose challenges in the efficient removal of tetracycline (TC) through adsorption-photocatalysis synergy. This study addresses these challenges by introducing MIL-101, known for its excellent chemical stability and large specific surface area. The amino functional group facilitates the in-situ growth of acyl chloride-covalent organic framework (AC-COF) on the surface of MIL-101, resulting in the fabrication of AC-COF@MIL-101 with a core-shell structure. Loading α -Fe 2 O 3 through structural regulation leads to the preparation of the final α -Fe 2 O 3 /AC-COF@MIL-101 ternary nanocomposite. In α -Fe 2 O 3 /AC-COF@MIL-101 composites, the high surface energy of AC-COF is mitigated by the strong chemical energy of N C-N, reducing AC-COF aggregation and decreasing the recombination rate of photogenerated carriers in α -Fe 2 O 3 . The heterojunction structure between AC-COF@MIL-101 and α -Fe 2 O 3 enhances the degradation of TC, attributed to the synergistic effect of adsorption and photocatalysis. Experimental results demonstrate that α -Fe 2 O 3 /AC-COF@MIL-101 has a maximum adsorption capacity of 135.14 mg/g, achieving a 100% TC removal rate within 30 min. Compared to AC-COF, MIL-101, and α -Fe 2 O 3 , α -Fe 2 O 3 /AC-COF@MIL-101 exhibits higher adsorption capacity and photocatalytic activity. Specifically, its adsorption capacity is 2.1 times that of AC-COF, 1.8 times that of MIL-101, and 10.6 times that of α -Fe 2 O 3 . Additionally, its degradation ability is 8.6 times that of α -Fe 2 O 3 . The adsorption of TC by α -Fe 2 O 3 /AC-COF@MIL-101 occurs through monolayer chemical adsorption, and the process is exothermic. The main active species involved in the photocatalytic degradation process are h + and ·OH. This study introduces a new ternary composite multifunctional material with high adsorption and photocatalytic performance for TC, offering a potential strategy for enhancing the synergistically adsorption-photocatalytic effect in ternary composite systems.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Advances
·
2023
·
IF 0
Min Li,Xudong Liu,Zhinan Xie,Chunfang Du,Yiguo Su
A one-step thermal polymerization approach was adopted to combine C3N5 with montmorillonite nanosheets (MMT Ns) to form xCN-MMT for the degradation of pollutants in water. Benefitting from the abundant hydroxyl groups on the MMT surfaces, double defects (–CN and N defects) were introduced in xCN-MMT catalysts to promote the adsorption of tetracycline (TC), peroxymonosulfate (PMS), and oxygen. 10CN-MMT exhibited superior adsorption performance toward TC, with the adsorption capacity being 5.65-fold that of MMT Ns and 2.64-fold that of C3N5. Further, 10CN-MMT exhibited better PMS activation performance than MMT Ns and C3N5, which could degrade 95% of TC within 120 min. Moreover, the total organic carbon (TOC) removal efficiency of the present system reached 81.1%, and the chemical oxygen demand (COD) decreased from 50.7 to 12.2 mg L−1. The degradation process of TC was characterized using liquid chromatography-tandem mass spectrometry (LC-MS), and a reasonable degradation pathway and catalytic mechanism were given by combining with active species analysis. The toxicological analysis of the degradation products also showed a significant decrease in toxicity. The degradation experiments in different water environments were also simulated, and it was found that 10CN-MMT showed good adsorption effects. This study provides a green metal-free clay-based catalyst and shows good applicability in removing antibiotics.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
Catalysts
·
2022
·Vol. 12
·期 11
·1449
·
IF 4.501
Haiqin Lu,Guilu Xu,Lu Gan
In the present study, nitrogen doped biochar (N-PPB) and nitrogen doped activated biochar (AN-PPB) were prepared and used for removing bisphenol A (BPA) in water through activating peroxymonosulfate. It was found from the results that N-PPB exhibited superior catalytic performance over pristine biochar since nitrogen could brought about abundant active sites to the biochar structure. The non-radical singlet oxygen (1O2) was determined to be the dominant active species responsible for BPA degradation. Having non-radical pathway in the N-PPB/PMS system, the BPA degradation was barely influenced by many external environmental factors including solution pH value, temperature, foreign organic, and inorganic matters. Furthermore, AN-PPB had richer porosity than N-PPB, which showed even faster BPA removal efficiency than N-PPB through an adsorptive/catalytic synergy. The finding of this study introduces a novel way of designing hieratical structured biochar catalysts for effective organic pollutant removal in water.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 47
·41420-41427
·
IF 3.289
Guohui Li,Avinav G. Nandgaonkar,Keyu Lu,Wendy E. Krause,Lucian A. Lucia,Qufu Wei
The engineering of supports for enzyme immobilization while retaining competent functionality is nontrivial. We attempted to enhance the removal efficiency of organics by adopting a relatively novel approach involving a synergy from the adsorption capabilities of a support incorporated with organically modified montmorillonite (O-MMT) and catalytic properties of immobilized laccase. Electrospun polyacrylonitrile (PAN)/O-MMT membranes after alkaline hydrolysis and carboxyl activation were chosen as the support system for laccase immobilization. A confocal laser scanning microscope confirmed a uniform enzyme distribution along with the fibers' longitudinal surface. After enzyme immobilization, the optimum pH shifted from 3 to 3.5, while the optimum temperature remain unchanged at 50 °C. Its stability was preserved despite a large fluctuation in pH (50% of its initial activity retained over the pH range 2–6) and temperature (more than 80% of its initial activity retained over 30–70 °C). Compared to free laccase, the thermal stability of the immobilized laccase was improved after being under 30 °C and 50 °C for 8 h. The operational stability was 68% of the initial one after 10 times repeated usage, while also demonstrating 80% storage stability of the initial activity even after two months. The immobilized laccase showed a high removal efficiency of crystal violet at an optimum pH of 5 and temperature ∼40 °C as well as an initial substrate concentration of 100 mg L−1. Compared with that of the individual support and the free laccase, the removal efficiency by an immobilized enzyme is far higher to confirm a synergy in the immobilized enzyme and support system.
研究领域:
生物技术
·
环境科学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Xiang Li,Wei Li,Shiyu Xie,Guoming Zeng,Sarfaraz Khan
Despite low exposure level in the water, environmental hormone pollutants can still inflict significant biological effects that endanger ecological safety and human reproduction. However, they are unable to be effectively removed using ordinary water treatment methods, which makes the deposition of environmental residues highly likely. In light of this demand, this study synthesized metal-doped g-C 3 N 4 composite photocatalysts and coupled them with nitrogen doped ordered mesoporous (NMC) carbon to treat water contaminated by environmental hormone micropollutants. The experimental results show that AgIn 5 S 8 /g-C 3 N 4 (25%) makes the prime candidate for degrading bisphenol A (BPA), displaying the highest degradation rates of 82%. Moreover, h+ and·O 2− were found to be the main active substances in the photocatalytic process, while the degradation rate of BPA by AgIn 5 S 8 /g-C 3 N 4 (25%) was still over 80% after 5 repeated photocatalyses. When the nitrogen doped ordered mesoporous carbon was coupled with AgIn 5 S 8 /g-C 3 N 4 (25%), the degradation and removal rates of BPA were greatly improved, demonstrating up to 94.8% removal rate in batch treatment. Furthermore, NMC/AgIn 5 S 8 /g-C 3 N 4 also exhibited good adsorption–photocatalytic synergy under continuous flow conditions of the fluidized bed, and the highest removal rate of BPA in the dark-free adsorption experiment was about 98.1%.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2019
·
IF 4.888
Mantang Chen,Nan Wang,Lihua Zhu
Single-atom catalysts with a maximum atomic utilization are promising in wastewater treatment. Herein, a single-atom dispersed Co-N-C catalyst was prepared by a calcination-acid treatment method. The obtained Co-N-C was confirmed to possess excellent performances of both adsorption and catalytic ability of activating peroxymonosulfate (PMS). It was found that the adsorption performance was related to the surface area and pore volume and the removal of bisphenol A (BPA) was determined by the defect density of the catalyst. It was observed that a calcination temperature of 900 °C yielded the best Co-N-C catalyst named Co-N-C-900. All the added BPA (80 mg L −1 ) was completely degraded in 3 min by using 0.5 g L −1 Co-N-C-900 and 0.3 g L −1 PMS with a degradation rate constant ( k ) of as high as 2.81 min −1 . In this single-atom catalytic system, the main reactive species were confirmed to be singlet oxygen. A mechanism study suggested that the fast and efficient degradation of BPA was attributed to the synergistic effect between fast adsorption of mesoporous carbon and efficient catalysis of single-atom Co-N x complex.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2023
·
IF 4.5
Shuyan Zhang,Yueqi Pan,Yihan Chen,Zhiwei Yang,Dongcai He,Nan Feng,Weijie Wang,Yunfeng Li,Danna Chen,Xianchun Chen,Jing Zhang
Graphical BP/MoS 2 heterojunction is prepared by solvothermal method using NMP, BP nanosheets and (NH 4 ) 2 MoS 4 . Under NIR irradiation, BP/MoS 2 can be heated up to 51.8 °C within 5 minutes by photothermal conversion. In addition, the existence of ⋅O 2 − and 1 O 2 in BP/MoS 2 -NIR system is verified to sterilize efficiently. With a loading content of 10 wt % MoS 2 , bacterial cells, especially drug-resistant bacteria (10 6 cfu ⋅ mL −1 ) completely can lose the viability within 10 min of NIR irradiation. In this research, a high-efficiency nano-fungicide with synergistic effect was obtained by combining polycrystalline MoS 2 with layered nano-BP to form heterojunction, which had a new photothermal-photocatalytic antibacterial mechanism to Gram-positive bacteria, Gram-negative and drug-resistance bacteria under NIR. BP/MoS 2 whose lethality of bacteria could reach nearly 100 % at 400 μg/L, exhibited the highest photothermal lysis efficiency against E. coli, B. pumilus and A. baumannii. It was found that the heterojunction could be heated up to 51.8 °C within 5 minutes by photothermal conversion, and it also had an excellent performance of photothermal cycle. High temperature and stability of the material endowed it with an outstanding and long-lasting bactericidal effect. In addition, a series of in vitro free radical experiments was designed, the existence of ⋅O 2 − and 1 O 2 in BP/MoS 2 -NIR system was verified. And the Way of ROS production and the mechanism of action were discussed by EPR test. Subsequently, two mechanisms of synergistic antibacterial action were summarized, that is, abundant ROS and high temperature could destroy cell wall damage and lysis of bacteria effectively. This study provides a theoretical basis for the synergistic antibacterial action of NIR photothermal and photocatalysis of BP system.
研究领域:
材料科学与工程
·
生物医学工程
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）