SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Yingxin Zhao,Cailian Zhao,Ying Yang,Zhuoran Li,Xiaojie Qiu,Junzhi Gao,Min Ji
As a widely used antibiotic, sulfamethoxazole (SMX) has attracted increasing research attention. However, acidic condition was normally required for efficient SMX removal, and the energy variation of adsorption system is not fully elucidated. In this study, based on a typical mineral adsorbent of volcanic rock (VR), anion exchange was introduced by Polypyrrole (PPy) modification to overcome the electrostatic repulsion in alkaline environment, and site energy distribution (SED) theory was applied to explore adsorption behavior and mechanism on SMX from an energy perspective. The batch adsorption experiments and a series of complementary characterization were combined, confirming that pore filling and hydrogen bonding are the dominant adsorption mechanisms for SMX removal by VR. While the adsorption distinction between PPy supported VR (PPy-VR) and VR could be explained by electrostatic attraction, π-π electron donor-acceptor interaction (π-π EDA) and ion exchange, which further explained the wide pH application potential of modified sorbent. Moreover, Dubinin-Ashtakhov (DA) model was used to calculate the energy distribution, and PPy-VR exhibited a stronger adsorption affinity ( E m = 8.55–11.57KJ/mol) and energy heterogeneity ( δ e *=2.15–2.57) for SMX. The high-energy adsorption centers increased significantly (92.63%) after modification, which mainly attributed to π-π EDA and ion exchange introduced by PPy loading. The surface modification method provides a feasible idea for the improvement of application environment of adsorbents, and the analysis of SED is expected to promote the understanding of the connection between site energy and adsorption mechanism.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
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2023
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IF 6.9
Zizheng Huangfu,Wei Ju,Yunhan Jia,Ruijun Ren,Zhenbei Wang,Chen Li,Xiaomeng Shang,Yujie Li,Hongnan Liu,Yu Wang,Hao Zheng,Fei Qi,Amir Ikhlaq,Jolanta Kumirska,Ewa Maria Siedlecka
Catalytic ozonation is an effective wastewater purification process. However, the low ozone mass transfer in packed bubble columns leads to low ozone utilization efficiency (OUE), poor organic degradation performance, and high energy consumption. Therefore, there is an urgent need to develop efficient supported catalysts that can enhance mass transfer and performance. However, the reaction mechanism of the support on ozone mass transfer remains unclear, which hinders the development of catalytic ozonation applications. In this study, lava rocks (LR)-supported catalysts, specifically CuMn 2 O 4 @LR and MnO 2 Co 3 O 4 @LR, were proposed for catalytic ozonation of IBP degradation due to their superior catalytic activity, stability, and high OUE. Addition of CuMn 2 O 4 @LR or MnO 2 Co 3 O 4 @LR increased IBP removal efficiency from 85% to 91% or 88%, and reduced energy consumption from 2.86 kWh/m 3 to 2.14 kWh/m 3 or 2.60 kWh/m 3 , respectively. This improvement was attributed to LR-supported catalysts enhancing mass transfer and promoting O 3 decomposition to generate •OH and •O 2 − , leading to IBP degradation. Furthermore, this study investigated the effects of ozone dose, supporter sizes, and catalyst components on ozone-liquid mass transfer. The results revealed that the size of the supporter influenced stacked porosity and consequently affected ozone mass transfer. Larger-sized LR (kLa= 0.172 min −1 ) exhibited better mass transfer compared to smaller-sized supports. Based on these findings, it was concluded that both CuMn 2 O 4 @LR and MnO 2 Co 3 O 4 @LR are potential catalysts for catalytic ozonation in residual IBP degradation of pharmaceutical wastewater, and LR showed good credibility as a catalyst supporter. Understanding the effects of supporters and active components on ozone mass transfer provides a fundamental principle for designing supported catalysts in catalytic ozonation applications.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Yang Liu,Qiang Ru,Yuqing Gao,Qinyou An,Fuming Chen,Zhenglu Shi,Minhui Zheng,Zikang Pan
Potassium-ion batteries are considered as one of safe and low-cost alternatives to the traditional lithium-ion batteries. However, the sluggish potassium ion kinetics, drastic volume variation and inferior cyclic reversibility hinder the further development for the commercial applications. Herein, a new type of polyimide-inspired volcanic rock-like carbon is synthesized by pyrolyzing N/O-rich polymer precursor of polymeric 1, 4, 5, 8-Naphthalenetetracarboxylic dianhydride (PNTCDA). The synergetic effect of the mesoporous construction, the prominent capacitance and the ameliorated conductivity endows PNTCDA@900 with boosted potassium-ion electrochemical properties. As anodes for PIBs, the discharge capacity of 185.3 mAh g −1 can be achievable after 100 cycles at a current density of 0.05 A g −1 , and the superior reversible capacity of 81 mAh g −1 is obtained even after 4000 cycles at a high current density of 2 A g −1 . The cell can be operated in a reliable environmental adaptability with 115–205 mAh g −1 from −5 °C~70 °C at 0.1 A g −1 . Furthermore, when applied to potassium-ion hybrid capacitors with active carbon as cathode, PNTCDA@900 delivers a reversible capacity of 53.5 mAh g −1 after 800 cycles at 2 A g −1 . The current work will be significant for the development of potassium-ion storage.
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
CARBON
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2023
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IF 10.9
Shenquan Yang,Lu Tang,Hanjun Wei,Jimei Xue,Zhijun Wang,Qingyuan Wang,Feng Zhao
Creating porous structures is a practical method for enhancing the impedance matching and interfacial polarization of dielectric materials , which in turn leads to improved electromagnetic (EM) wave absorption performance . However, the use of nanoparticles , nanorods , and two-dimensional materials to construct a simple porous structure typically has a minor effect on the EM parameters and interface polarization. To improve impedance matching and reduce the reflection of EM waves while simultaneously enhancing interfacial polarization, a more rational structure for dielectric materials is desired. Herein, a ytterbium oxide/reduced graphene oxide (Yb 2 O 3 /rGO) composite with a volcanic rock-like structure is proposed to exhibit outstanding impedance matching and loss capacity and achieve high EM wave performance. The addition of Yb 2 O 3 is utilized to induce the formation of porous structures with varying morphologies. Yb 2 O 3 not only significantly improves the polarization loss but also facilitates volcanic rock-like structure construction, thus improving the EM wave performance. As a result, the Yb 2 O 3 /rGO composites with a volcanic rock-like structure exhibit outstanding EM absorption performance, including three-band absorption (C, X, and Ku bands), as evidenced by their minimum reflection loss (RL min ) of −57.2 dB (equivalent to 99.9999% effective absorption) at 11.6 GHz when the matched thickness is 2.1 mm and an effective absorption bandwidth (EAB) of 4.2 GHz. Simulations in the CST microwave studio further validate the benefits of the composite's unique structure, which shows a radar cross-section (RCS) reduction value of up to 38.1 dB m 2 . This work offers valuable insights for the development of next-generation EM wave absorption materials through the implementation of a well-designed and distinctive structure.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
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2025
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IF 7.7
Bo Song,Zhenxing Shen,Qingzhu Tian,Guiling Zhou,Qin Peng,Hao Fan,Jia Liu
Volcanic rock is a natural mineral with a porous structure and rich in various metal oxides. It has been used in environmental applications such as water and soil pollution remediation as stable chemical properties and low cost. In this work, volcanic rock was used in the field of nitrogen oxide control, and the feasibility of preparing NH 3 - Selective Catalytic Reduction catalyst was evaluated. The catalyst AVR-10Mn-450 was prepared by acidification-impregnation-calcination process, and it can achieve more than 90 % denitration effect at 175 °C, 25000 h −1 . It removes nitrogen oxides through the Eley–Rideal and Langmuir–Hinshelwood pathways. AVR-10Mn-450 has the advantages of simple preparation and low cost compared with the mainstream nano-denitration catalysts. It can be applied to the pretreatment of industrial flue gas such as cement plant or glass plant, thereby extending the service life of the precious metal or nano-catalyst at the back end. This work not only realizes the high-value resource utilization of volcanic rock, but also reduces the production cost of denitration catalyst.
研究领域:
环境科学
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催化化学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Xiurong Zhu,Lei Ge,Wei Yan,Shengjiong Yang,Gen Wang,Delu Miao,Pengkang Jin
Heterogeneous activation of peroxymonosulfate (PMS) has been frequently proposed for the degradation of organic pollutants via the generation of reactive oxygen species (ROS). Spinel ferrite such as CoFe 2 O 4 shows great advantage for PMS activation but suffers from aggregation problem and lack of microstructure. Herein, network-like CoFe 2 O 4 immobilized on volcanic rock was synthesized for PMS activation for degrading sulfamethoxazole (SMX). The immobilized CoFe 2 O 4 network exhibited good catalytic performance for SMX removal. Systematic investigations, including in situ ATR-FTIR and Raman spectroscopy analysis, chemical quenching experiments and electron paramagnetic resonance (EPR) tests, revealed that a redox cycle of Co 2+ /Co 3+ induced the generation of ROS (SO 4 •− , OH • and 1 O 2 ) that participated in the degradation of SMX. Background constituents (e.g., inorganic ions and natural organic matters) exhibited limited influence on SMX removal. A continuous flow-through reaction in a fixed-bed column revealed the immobilized CoFe 2 O 4 network could efficient degrade SMX with long-term durability, which therefore can be a promising catalyst for PMS activation for the degradation of SMX.
研究领域:
环境科学
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催化
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水处理
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材料科学
✓ 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）