JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Chaolei Yuan,Fangbai Li,Wenhua Cao,Zi Yang,Min Hu,Weimin Sun
We successfully accounted for the dynamics of cadmium (Cd) solubility in paddy soil that contained a realistically low total Cd concentration (0.36 mg kg −1 ) after submergence and redrying by monitoring multiple chemical and microbial soil properties. The addition of rice straw promoted greater microbial iron reduction and induced a greater increase in soil pH after submergence, compared to the control and treatments with added gypsum or hematite. Consequently, dissolved Cd decreased to under the detection limit in one week in the straw-amended treatment but remained high even after eight weeks in the other three treatments. The Cd solubility strongly correlated with soil pH and was unlikely to decrease due to Cd precipitation in secondary iron minerals. After five weeks of redrying, the dissolved Cd content was still the lowest, and the putative iron-reducing bacteria Geobacter remained the most abundant in the straw-amended soil. The results suggest that the addition of organic matter can efficiently immobilize soil Cd at an environmentally realistic concentration by stimulating the microbial reduction of native oxidized soil components after submergence, while adding extra iron oxide or sulfate alone is not effective because it does not eliminate the limitation imposed by electron donors on microbial reduction.
研究领域:
土壤科学
·
环境微生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Pengtao Cai,Tong Chen,Mingxiu Zhan,Xiaojun Ma,Masaki Takaoka,Chen Sun,Xiaodong Li
Per- and polyfluoroalkyl substances (PFAS) are known for their strong C-F bonds, which make them highly persistent in the environment and resistant to degradation. Among PFAS, perfluorobutane sulfonate (PFBS), a short-chain PFSA widely used as a replacement for long-chain PFAS like perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS), has garnered attention due to its environmental persistence and toxicity. Although PFBS has lower bioaccumulation potential than its long-chain counterparts, it remains a significant pollutant with limited data available on its degradation mechanisms. To address this, the present study investigates PFBS degradation under subcritical water hydrothermal conditions. Various alkaline substances and additives were tested, and degradation products were analyzed by liquid and gas chromatography-mass spectrometry. Results show that 2 M NaOH at 325°C achieved an ∼99.4 % PFBS removal rate, and the degradation pathway began with the breakdown of the S-C bond, followed by C-F bond cleavage, resulting in the formation of smaller fluorinated compounds, including trifluoroacetic acid. Density functional theory (DFT) calculations provided detailed insights into the degradation mechanism, identifying hydroxide ion attack on the sulfonic acid group as the initial step and elucidating three distinct pathways for subsequent reactions. This study provides key insights into PFBS degradation mechanisms, emphasizing the synergistic effect of alkaline bases and additives. The findings support the optimization of subcritical hydrothermal treatment for PFAS removal, providing a scalable and environmentally sustainable solution.
研究领域:
环境科学
·
化学工程
·
理论计算
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产品关联
DOI
PubMed
高影响因子
ChemElectroChem
·
2024
·Vol. 11
·期 10
·e202300710
·
IF 3.5
Hussein A. Younus,Heba Emam,Nazir Ahmad,Mosaad Negm,Muneerah Alomar,Fatma M. Elantabli,Mohammed M. El-Rabiei,Rashid Al Hajri,Shiguo Zhang,Mohammed Al Abri
Graphical Copper Glycine Schiff Base Catalyst : Mimicking natural processes, this dinuclear copper catalyst with a Schiff base ligand efficiently catalyzes HER from neutral water, showcasing remarkable rate and stability. It reaches ~19 mA cm −2 at −0.7 V vs. RHE ( i c /i p =166), corresponding to a k obs of ~27,000 s −1 , one of the highest TOFs for an earth-abundant molecular catalyst under similar coditions. The development of an efficient and stable electrocatalyst for the hydrogen evolution reaction (HER), based on earth-abundant components, represents a crucial step toward cost-effective and environmentally friendly hydrogen production. This study presents the utilization of a dinuclear copper catalyst, denoted as [Cu-Gly-SB] (Complex 1 ), for HER under both aqueous and non-aqueous conditions. In non-aqueous settings, the catalyst achieves excellent HER performance, requiring only a 270 mV overpotential when acetic acid is used as the proton donor. Notably, in fully aqueous conditions, complex 1 attains a remarkable current density of 18.8 mA ⋅ cm −2 at −0.7 V vs . RHE in cyclic voltammetry. The k obs value of ≈2.7×10 4 s −1 in aqueous solution at pH 7.0 further underlines the superior catalytic performance of 1 , outperforming most non-noble-metal molecular catalysts functioning in fully aqueous solutions. The robust stability of 1 is demonstrated through controlled potential electrolysis (CPE) over a span of 48 hours, achieving an impressive catalytic current of 11.0 mA ⋅ cm −2 at −0.39 V. Moreover, the catalytic current gradually increases with higher reduction potentials, reaching a substantial 100 mA ⋅ cm −2 at an overpotential of 590 mV during CPE >48 hours. Thorough characterizations further confirm the molecular nature of the catalyst.
研究领域:
化学
·
材料科学
·
催化科学
✓ 已验证
DOI
高影响因子
Chemical Science
·
2020
·Vol. 11
·期 15
·3978-3985
·
IF 9.346
Jing Cao,Wenjie Ma,Kangjie Lyu,Lin Zhuang,Hengjiang Cong,Hexiang Deng
We report the design and synthesis of a titanium catecholate framework, MOF-217, comprised of 2,4,6-tri(3,4-dihydroxyphenyl)-1,3,5-triazine (TDHT) and isolated TiO6 clusters, with 2-fold interpenetrated srs topology. The dynamics of the organic linker, breaking the C3h symmetry, allowed for reversible twist and sliding between interpenetrated frames upon temperature change and the inclusion of small molecules. Introduction of 28 wt% imidazole into the pores of MOF-217, 28% Im-in-MOF-217, resulted in four orders of magnitude increase in proton conductivity, due to the appropriate accommodation of imidazole molecules and their proton transfer facilitated by the H-bond to the MOF structure across the pores. This MOF-based proton conductor can be operated at 100 °C with a proton conductivity of 1.1 × 10−3 S cm−1, standing among the best performing anhydrous MOF proton conductors at elevated temperature. The interframe dynamics represents a unique feature of MOFs that can be accessed in the future design of proton conductors.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Ximeng Zhang,Yue Zhou,Fangbo Zhao,Chengbao Geng,Zhiguo Li,Jiaming Zhang,Ye Yang,Hongxu Chen
There are positively charged Ca 2+ and Mg 2+ , negatively charged colloids and lots of bacteria in seawater. The different surface potentials of ultrafiltration membranes may lead to different adsorption properties for contaminants in seawater when ultrafiltration membranes were applied to the pretreatment of Reverse Osmosis process. Herein, this work prepared modified ultrafiltration membranes with different surface potentials using three GO-based materials, and investigated the anti-fouling of Ca 2+ , Mg 2+ , humic acid, the anti-bacterial adhesion performance and mechanisms of modified ultrafiltration membranes under simulated seawater conditions. Results showed that the modified membranes exhibited enhanced hydrophilicity, anti-fouling performance, antibacterial property and permeability compared with the unmodified polyvinylidene fluoride membrane. Conspicuously, with the highest surface potential among all membranes, quaternized graphene oxide modified ultrafiltration membrane (QGO-M) presented the best anti-fouling property to Ca 2+ , Mg 2+ , humic acid and antibacterial property. In particular, the flux recovery rate against the simulated seawater solution containing humic acid and the surface bacteriostatic rate against salt-tolerant bacteria of QGO-M were 95.7% and 97.9%, respectively. The results can provide an important reference for the investigation of modified ultrafiltration membranes suitable for seawater filtration.
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
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 29
·14644-14652
·
IF 11.301
Yong-Jun Chen,Yifa Chen,Chang Miao,Yi-Rong Wang,Guang-Kuo Gao,Ru-Xin Yang,Hong-Jing Zhu,Jian-Hui Wang,Shun-Li Li,Ya-Qian Lan
Microplastics are a worldwide problem that poses a giant threat to organisms in the ecosystem and even to human health. The removal of microplastics is a severe challenge that needs to be solved urgently. Herein, a series of zirconium metal–organic framework-based foam materials with interpenetrated pores, high MOF uniformity and excellent durability have been successfully fabricated and applied in simulated microplastics removal in water or seawater conditions. They can be applied to various types and concentrations of microplastics suspensions. It is worth noting that the best of them, UiO-66-OH@MF-3, can efficiently remove microplastics with an efficiency of up to 95.5 ± 1.2% and can maintain high performance in recycling and large-quantity filtration experiments. Besides, we proposed an automatic filtration system powered by sunlight and accomplished it on the lab-scale. The high performances of these foam materials combined with the new concept of automatic filtration systems might shed some light on the development of novel techniques for microplastics removal.
研究领域:
环境科学
·
材料科学
·
生态学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Ruiqi Yan,Sen Lin,Weinan Jiang,Xia Yu,Lei Zhang,Wentao Zhao,Qian Sui
Magnetic nanotechnologies have been shown to be an efficient approach to the reduction of microplastic (MP) pollution in aquatic environments. However, uncertainties remain regarding the relationship between particle stability and MP removal under varying water conditions, hindering the practical application of magnetic nanotechnologies for MP removal. Herein, the influence of particle aggregation behavior on nano-scale MP removal by Fe 3 O 4 nanoparticles (FNPs) was investigated, by monitoring dynamic light scattering parameters and analyzing the microstructures of particle aggregates. Results showed that 83.1 %–92.9 % of MPs could be removed by FNPs within 1 h, and MP removal exhibited a high degree of Pearson correlation ( R = 0.95; P = 0.04) with particle aggregation behavior mediated by the FNPs dosage. Furthermore, pH-dependent electrostatic interactions significantly influenced particle aggregation behavior and the removal of MPs. Under pH <6.7 conditions, electrostatic attraction between electropositive FNPs and electronegative MPs led to charge neutralization-induced aggregation and efficient removal MP performance. Under increasingly saline conditions, compression of the electrical double layer enhanced the self-aggregation behavior of MPs, weakening the electrostatic repulsion between FNPs and MPs under alkaline conditions. Therefore, salinity improved the MP removal efficiency, especially under alkaline conditions, with MP removal increasing from 4.47 % to 55.1 % when the mass fraction of NaCl was increased from 0 % to 1 %. These findings further our understanding of the effect of aggregation behavior on MP removal by FNPs and highlight the potential for magnetic nanotechnology application in the removal of nano-scale MPs from aquatic environments, while also providing valuable insights for the design of FNP-based materials.
研究领域:
环境科学
·
纳米技术
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Xinbo Wang,Pengcheng Ma,Cong Yu,Junjie Bian,Xianglong Meng
Oil shale is a promising unconventional energy source whose processed oil products exhibit a H/C ratio comparable to that of crude oil. This study introduced a purely organic acid-base bifunctional porous material, HCP-BBA-S, and conducted a comprehensive investigation of its catalytic performance in the hydrothermal pyrolysis of oil shale under near-critical water conditions. Upon incorporation of the HCP-BBA-S catalyst, shale oil yield increased by 4.61–19.22 %, accompanied by a shift in oil composition towards lower carbon numbers and lower boiling points. Oxygen content in the products decreased significantly, improving oil quality and calorific value. Under optimized conditions, shale oil yield reached 41.85 %, with an H/C atomic ratio of 1.8 and a calorific value of 41.42 MJ/kg. These results highlight HCP-BBA-S as a highly effective catalyst for enhancing both the yield and quality of shale oil, offering a sustainable approach to unconventional energy resource utilization.
研究领域:
能源化学
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Yuxiao Li,Meishan Zhang,Xueyan Wang,Zhun Li,Lianhua Zhao
Sulfonated poly (ether ether ketone) (SPEEK, SP) with tetraethoxysilane (TEOS) and diethylethylammonium trifluoromethanesulfonate ([dema] [OTf]) were used to make SP/SiOx/OTf inorganic–organic composite membranes by the sol–gel method. The composite membranes were studied with respect to their structural, thermal, ionic liquid leeching (ILs), mechanical, and proton conduction properties. Fourier transform infrared spectroscopy (FT-IR) results showed that there exist intermolecular forces between the sulfonic groups, silica, and ILs in the composite membrane. Thermogravimetric (TG) results showed that the thermal stability of the SP/SiOx/OTf composite membrane is better than that of the pristine SPEEK membrane. IL leaching studies showed that the sulfonic group could help to reduce the loss of ILs. The introduction of silica in the SP/SiOx/OTf composite membrane could further reduce the loss of ILs, and also reduce the swelling degree of the composite membrane. Dynamic mechanical analysis (DMA) data showed that the introduction of silica can increase the flexibility of membranes, and improve the mechanical properties. A proton conductivity of 2.003 × 10 −2 S/cm was obtained for a 50 wt% [dema][OTf] doped SP-66/SiOx/OTF-50 composite membranes at 220 °C under anhydrous conditions.
研究领域:
材料科学
·
高分子化学
·
能源材料
·
电化学
·
膜科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yongjoon Choe,Sungjun Cho,Chaemin Kim,Jongmuk Won,Susan E. Burns
Nonionic polyacrylamide (NPAM) is a water-soluble flocculant frequently used to immobilize toxic contaminants and for contaminant treatment. This study examines the influence of NPAM concentration (0–10 mg/L), cationic valence (NaCl or CaCl 2 solution), and clay mineralogy (kaolinitic and illitic clay) on the flocculation and post-settling behavior under water content ( w ) = 500–4000 %, using sedimentation and rheology experiments. The significant increase in settling velocity by NPAM treatment was observed, with a maximum of 92 % reduction in settling velocity. In addition, kaolinitic clay formed larger and faster-settling flocs than illitic clay, and CaCl 2 solution showed a stronger shear-thinning response than NaCl solution. The zero shear viscosity of NPAM-treated kaolinitic clay increased approximately 3-fold compared to untreated conditions, indicating strong intra-floc bonding of NPAM-treated kaolinitic clay. The high separation distance (up to 2.2 µm for kaolinitic clay) of stacked clay flocs at high NPAM concentration suggests that NPAM concentrations below 5 mg/L can be recommended for obtaining mechanical stability of settled clay after settling. Overall, these findings provide a comprehensive understanding of NPAM-clay interactions at varied cationic valence, clay type, and NPAM concentration under saline conditions.
研究领域:
环境科学
·
胶体与界面科学
·
土壤科学
·
高分子科学
·
化学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 46
·期 4
·4794-4807
·
IF 5.164
Shoulei Miao,Zhenrong Liu,Haiqiu Zhang
Summary 1,2,4-triazole is successfully grafted onto C═C bonds of graphene oxide surface with retained carboxylic acid, hydroxy, and epoxy groups. The structure of the resulting 1,2,4-triazole-doped graphene oxide (NGO) is proved by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy spectra. The polybenzimidazole (PBI)/NGO composite membranes (NGO content:0.5%, 1%, 3%, 5%) were also prepared and subjected to the absorption of various suitable amounts of phosphoric acid (PA). As expected, the composite membranes well maintained their superior mechanical properties (57-69 MPa) containing 2 PA molecules per PBI unit. The morphological characterization using the atomic force microscopy phase images and transmission electron microscopy analysis revealed a micro-phase separation, providing continuous ionic channels and ultimately enhancing the ionic conductivity. As a result, the maximum proton conductivity of 27 mS cm −1 is achieved for PBI/NGO-3 membrane (NGO content: 3%) at 160°C under anhydrous conditions, and the maximum power density of the cell using PBI/NGO-3 membrane is 254 mW cm −2 . These composite membranes displayed great potential for high-temperature proton exchange membranes under anhydrous conditions. The scanning electron microscopy images further showed the condensed structures with the suitable quantity of NGO in the composite membranes due to the hydrogen bonding and acid–base interactions between NGO and PBI. This condensed structure improved the mechanical properties, enhanced thermal stability, and increased oxidative stability of the composite membranes. Additionally, the PBI/NGO/PA composite membranes exhibit high thermal decomposition temperature (Td[5%] higher than 284°C) and superior tensile strengths (greater than 55 MPa). Remarkably, the membranes demonstrated exceptional oxidative stability and could maintain less than 15% quantity loss for more than 200 hours in Fenton's reagent (3 wt% H 2 O 2 , 4 ppm Fe 2+ ). Novelty statement The manuscript entitled “Enhanced Performance of High-Temperature Proton Exchange Membrane by Introducing 1,2,4-Triazole Functionalized Graphene Oxide into Polybenzimidazole” was written by Haiqiu Zhang In this work, 1,2,4-triazole is successfully grafted onto graphene oxide nanosheets by C═C bonds without damaging other groups, and condensed structure improved the oxidative stability effectively, meanwhile, with the low-acid-loaded quantity and gained higher proton conductivity under anhydrous condition.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）