Sustainability
·
2023
·Vol. 15
·期 15
·11867
·
IF 3.9
Na Chai,Lihui Gao,Shulei Li,Zilong Ma,Lingni Li,Ming Hu
Modified persimmon peel–montmorillonite composites (PMHC-KOH/NaHCO3) for efficient and rapid removal of methylene blue (MB) were synthesized using hydrothermal carbonization and simple alkali impregnation. The surface properties and material compositions of the hydrochars were determined with SEM, zeta potential, and XRD, and the adsorption mechanism of MB on two modified hydrochars was analyzed with FTIR, XPS, and DFT calculation. The results showed that modified hydrochars with a rough surface structure and rich oxygen-containing groups exhibited a strong affinity for MB, and the adsorption capacity of PMHC-NaHCO3and PMHC-KOH for MB reached 121.28 mg/g and 278.41 mg/g, respectively, with PMHC-KOH achieving more rapid adsorption of MB, at a rate of 0.043 g/mg/min. After five adsorption/desorption cycles, the two modified hydrochars still maintained a high adsorption rate of MB (92.32%/98.43%). The excellent adsorption performance of the modified hydrochars was attributed to hydrogen bonding, π-π interaction, electrostatic attraction, and ion exchange. DFT calculations revealed that oxygen-containing groups of the modified hydrochars played an important role in the adsorption of MB and confirmed that electrostatic attraction, hydrogen bonding, and π-π interactions were the key forces for rapid and efficient adsorption of MB. The prepared adsorbents gave full play to the regenerative applicability of agricultural waste, the simple alkali impregnation method eliminated the need for the additional cost of pyrolysis and activation, and their application in MB adsorption realized the treatment of waste with waste.Keywords:alkali-modified hydrochar;methylene blue;oxygen-containing functional groups;adsorption
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
MATERIALS RESEARCH INNOVATIONS
·
2015
·
IF 0.83
J. Fu,C. Wei,W. Wang,J. L. Wei,J. Lv
This article describes the preparation of graphene oxide sheet by ball milling of graphite oxide (prepared by modified Hummer's method) using water as the medium. The structure and properties of the graphene oxide sheet samples were characterised by Fourier transform infrared spectroscopy, X-ray diffraction, Raman, X-ray photoelectron spectroscopy and SEM. The results indicated that the alignment of graphite oxide degraded as the duration of ball milling increased. The graphite oxide was completely exfoliated after being ball-milled for 30 h and graphene oxide sheet were obtained. Also, it was found that the oxygen-containing functional groups such as carbonyl and epoxy groups on the surface of graphene oxide sheet could be effectively removed by ball milling through its mechanochemical effect. In summary, the proposed ball milling method is a facile and effective method for graphene oxide sheet preparation.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Wenbin Gao,Yuzhen Chen,Jiahao Rao,Zhan Hu,Yan Tan,Yujiao Wen,Yifan Wang,Zhi Zhou,Yongfa Zhu,Nan Zhou
Biochar currently served as the support for dispersed metal nanoparticles and cooperated with pyrite to generate more reactive radicals in organic pollution degradation system. But the mechanism of interaction between biochar and pyrite has not been elucidated. In this paper, biochar with oxygen-containing functional groups (OFGs) served as a stable dispersant to prepare nano-Fe x S y loaded biochar materials (BC OFGs @nano-Fe x S y ). BC OFGs coordinated with nano-Fe x S y to overcome its drawbacks, boosting QNC removal efficiency from 28.64% to 100%. The XPS and the linear sweep voltammetry (LSV) results revealed higher Fe(II) content and higher electron transfer rate on used BC OFGs @nano-Fe x S y , further validating that hydroxyl functional groups on biochar surface provided electrons to Fe(III) to achieve efficient Fe(II)/Fe(III) cycling. Based on comparative experiments and studies on the roles of iron, S(II) species and OFGs, we clearly revealed that OFGs on biochar materials surface coordinated with nano-Fe x S y to catalyze the degradation of QNC. The degradation efficiency of BC OFGs @nano-Fe x S y for QNC was still as high as 91.39% after five cycles, providing full demonstrations that OFGs and S(II) as the abundant electron donor coordinated with Fe species for QNC catalytic degradation and further enhanced the catalytic performance and stability of nano-Fe x S y .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Environmental Chemistry and Ecotoxicology
·
2025
·
IF 8.2
Yanhua Wang,Zhengli Tang,Yingnan Liu,Yilin Qian,Shuo Yang,Anqi Wang,Zhibao Dong,Baoshan Xing
Microplastics (MPs) aggregation critically governs their environmental transport, yet interactions with mineral surfaces remain underexplored. In this study, polyethylene (PE) MPs were employed as model particles to prepare both pristine PE and bovine serum albumin (BSA)-coated PE (B-PE). The heterogeneous aggregation of these particles with inorganic minerals (goethite, hematite, pyrite, magnetite) and clay minerals (kaolinite, montmorillonite) was systematically investigated under varying pH conditions (3.0, 6.0, 9.0) and ionic strengths (NaCl 5–300 mmol/L, CaCl 2 1–50 mmol/L). Results demonstrated that positively charged inorganic minerals exhibited significantly stronger heterogeneous aggregation with negatively charged PE, exhibiting aggregation capacities 2.97 times higher than those of negatively charged clay minerals. The introduction of oxygen-containing functional groups such as COOH and OH on the B-PE surface not only enhanced electrostatic attraction but also facilitated ligand exchange and hydrogen bonding, further improving aggregation efficiency. At pH 3.0, removal efficiencies of PE and B-PE for inorganic minerals exceeded 90 %, while aggregation was nearly completely inhibited at pH 9.0. With increasing NaCl concentration, the critical coagulation concentration (CCC) of B-PE decreased by 29.6 %–42.6 % compared to pristine PE. Moreover, Ca 2+ ions exhibited a stronger promoting effect on aggregation via cation bridging than Na + ions. These findings reveal the synergistic regulatory effects of mineral type, protein coating, and environmental factors on microplastic-mineral heterogeneous aggregation, providing a theoretical foundation for predicting the transport and fate of microplastics in complex natural aquatic environments, as well as for developing biomolecule-based sustainable remediation strategies.
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 THE ENERGY INSTITUTE
·
2024
·
IF 5.6
Meilu Hao,Peng Liang,Miaomiao Tian,Songze Li,Yue Gao,Yaqing Zhang,Xizhuang Qin,Wenrui Zhang,Tiantian Jiao
To efficiently utilize the oxygenated structures in lignite and obtain value-added oxygenated compounds, this study proposes a low carbon cascading utilization of Zhaotong lignite (ZT) through thermal dissolution and pyrolysis. The selectivity of ethanol (ET), tetrahydrofuran (THF) and ethyl acetate (EA) for oxygenated compounds in thermal dissolution, and the enrichment of thermal dissolution-pyrolysis on oil phases were investigated. The results show that sequential thermal dissolution is selective for different oxygenated compounds in ZT. ET shows selectivity for esters at 350 °C-2 MPa and for phenols at 350 °C-6 MPa. THF and EA are selective for naphthols and esters at 350 °C-6 MPa, respectively. Compared with the single process of thermal dissolution or pyrolysis, thermal dissolution-pyrolysis can significantly increase the oil phases yield with high value-added, in which ET, THF and EA increase the oil phase yields by 24.81 wt%, 13.66 wt% and 7.90 wt%, respectively. In particular, 59.15 wt% of the oxygen is distributed in light oil, and 9.79 % phenols as well as 1.56 % esters are enriched into light oil during thermal dissolution-pyrolysis process of ET. High value-added oxygenated compounds can be selectively enriched by appropriate solvents, at the same time, the quality of pyrolysis tar can be improved and the carbon emissions could be reduced.
研究领域:
化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
Coatings
·
2021
·Vol. 11
·期 7
·850
·
IF 2.881
Kaixin Fu,Yi Li,Xiumin Chen,Wenhui Ma,Ziheng Yang,Tong Wang,Jiasen Liu,Zhuang Ma,Ran Chen,Xiuhua Chen,Shaoyuan Li
In this study, amino group surface-functionalized porous silicon adsorbent was successfully prepared for the first time using diamond wire saw silicon powder (DWSSP) as raw material through copper-assisted chemical etching (Cu-ACE) and organic functional group grafting. Amino-functionalized porous silicon adsorbent (TEPA-GTS-NPSi) can be used for removing As(V) from water. The properties and mechanism of the new adsorbent were characterized by infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (FE-SEM), Brunauer–Emmett–Teller analysis (BET), and thermogravimetric analysis (TGA). The concentration of metal ions in the solution was determined by inductively coupled plasma spectrometry. Meanwhile, the effects of initial pH, adsorption time, initial concentration and adsorbent dosage on the removal of As(V) in an aqueous solution were studied by intermittent adsorption experiments. The results showed that the adsorption equilibrium could be reached rapidly after 30 min soaking. Under the optimized pH of 7, the maximum adsorption capacity was 13.2 mg/g, and the minimum adsorption limit was 3 mg/L. The adsorbent shows good adsorption performance after five successive regenerated cycles. Based on the density functional theory (DFT) analysis results, the adsorption mechanism is attributed to hydrogen bond interaction between the NH2group and As(V) ions.Keywords:silicon cutting powder;copper-assisted chemical etching;surface modification;waste recycling;arsenic removal
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Molbank
·
2022
·Vol. 2022
·期 2
·M1373
·
IF 0
Jialuo Chen,Lili Duan,Kunming Liu,Jin-Biao Liu
This short note elaborates a concise protocol for the synthesis of two novel vicinal haloethers bearing a malonontrile group, 2-bromo-2-(methoxy(phenyl)methyl)malononitrile (1) and 2-iodo-2-(methoxy(phenyl)methyl)malononitrile (2). The structures of the synthesized compounds were confirmed by 1H, 13C-NMR spectroscopy. The final products indicate that methanol not only acts as solvent but also participates in and dominates the reaction result.Keywords:β;β-dicyanostyrene;difunctionalization;vicinal haloether
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Yanling Feng,Yufei Liu,Chen Su,Xinghu Ji,Zhike He
Silicon nanodots (SiNDs) are currently appealing to extensive studies due to their low toxicity and unique optical and electrical properties. In this work, we obtained label-free SiNDs via a facile hydrothermal method. The approach offers advantages in terms of cheap reactants, easy operation and a short time. The quantum yield (QY) of the SiNDs is up to 32.8%, and the as-prepared nanoparticles exhibit strong fluorescence (FL), higher photostability and obviously longer FL lifetime. More importantly, these label-free SiNDs can be used as a highly sensitive pH sensor, which FL respond rapidly to pH fluctuations and reveal a good linear relationship. Also, a superior pH-reversibility was demonstrated. Different salt ions show a little influence on the pH-responsive behavior. The pH of real water samples were tested on the basis of the proposed SiNDs sensor and the results are satisfactory. Further, traditional SiNDs with Si H or Si C surfaces make them less water-soluble or sensitive to the pH. Whereas, our SiNDs feature amino-terminated surface and these amino groups are conducive to the pH sensitivity. In a word, this new, cheap, low-toxic, and effective fluorescent pH sensor based on label-free SiNDs would be a promising candidate in biological field.
研究领域:
生物化学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2020
·
IF 8.821
Xiaoxiao Chen,Dengguo Lai,Baoling Yuan,Ming-Lai Fu
Oxygenated groups in graphene oxide (GO) have significant influences on the physicochemical properties of GO. Accurate identification and manipulation of oxygenated groups should be essential for sheets functionalization and assembly, but remains challenging. Herein a novel design of oxygenated groups on GO via a facile alkali-annealing strategy is reported to rationally “unlock” specific groups and increase covalent bonding density on sheets. The structural evolution of epoxy and enriched in hydroxyl are well monitored and verified. Based on the fact that hydroxyl is widely regarded as active sites for cross-linker polyvinyl alcohol, a well interweaved graphene aerogel (GA) with ordered “layer-strut” bracing architectures is successfully fabricated. The constructed GA possesses an ultralow density of 1.73 mg cm −3 , exceptional resilience with 85% compressive strength recovery even after 1000 cycles, and high conductivity of 17.1 S m −1 , demonstrating the significantly reinforced interplays between adjacent layers. The highest specific conductivity (σ/ρ) of the optimized GA reaches 98.8 S cm 2 g −1 , which is far superior to conventional GA assembled by GO in as-prepared form and exceeding most graphene-based aerogels reported. This new insight into precise engineering oxygenated structures will provide inspirational ideas towards more elaborate graphene-related architectures and a better overall understanding of GO structure.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Panpan Chang,Jie Zheng,Yongbing Cen,Fan Yang,Xuguang Li,Qingruo Xie,Jinshi Dong
Biomass-derived porous carbons (BD-PC) have evoked wide attention in the field of supercapacitors . However, the oxygen-containing groups (OFGs) in BD-PC bring a great threat to the structural stability of porous carbons in organic electrolyte at the voltage window higher than 2.7 V. Therefore, it is a worthwhile challenge to construct BD-PC with very-low content of OFGs which can operate stably at the ultrahigh voltage window. Herein, the green and renewable fulvic acid biomass is used as carbon precursor to construct 3D hierarchical porous carbon (HPC) with high yield of 13.3% by KOH activation and annealing method. This HPC presents continuous carbon network with ultrathin nanosheets of 50 nm. It has high specific surface area of 3028 m 2 g −1 , good e -conductivity of 43 S m −1 , ultrahigh C/O ratio of 27.4 and high sp 2 carbon content of 90%. Thus, the voltage window upper limits can be raised up to 3 V in TEABF 4 /PC and 3.5 V in EMIMBF 4 electrolytes. In TEABF 4 /PC electrolyte, this HPC displays high C g of 124 F g −1 at 0.05 A g −1 with C 10/0.05 as high as 70.8% and ultralong lifespan of 94% after 20,000 cycles. In EMIMBF 4 electrolyte, the energy density can reach up to 56.6 Wh kg −1 .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 28
·期 5
·5149-5157
·
IF 3.056
Li Yingchao,Zhou Mengqi,Waterhouse Geoffrey I. N.,Sun Jianchao,Shi Weijie,Ai Shiyun
Carbon aerogels are attracting much attention as adsorbents due to their high specific surface and large accessible pores. Herein, we describe a successful synthesis of a magnetic carbon aerogel (MCA) using sodium alginate (SA) as the main carbon source, gelatin (G) as a cross-linking agent and secondary carbon source, and Fe 3 O 4 nanoparticles as the magnetic component. A simple pyrolysis treatment at 550 °C under N 2 transformed a Fe 3 O 4 /SA/G hydrogel precursor into the MCA. The obtained magnetic carbon aerogel possessed a high specific surface area (145.7 m 2 /g), a hierarchically porous structure, and an abundance of surface hydroxyl (–OH) and carboxyl (–COOH) groups, resulting in outstanding sorption properties for aqueous Cd(II) (an adsorption capacity of 143.88 mg/Lmg/g). The mechanism of Cd(II) adsorption by the MCA was investigated, with the results obtained suggesting that the MCA removed cadmium ions from water by both electrostatic adsorption and complexation. Since the MCAs contained Fe 3 O 4 nanoparticles, they could easily be separated and recovered from water using a magnet. This study thus identifies a promising and efficient technology for removing Cd(II) ions from aqueous solutions.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 4
·e202304217
·
IF 1.9
Jinfa Yu,Zhaoqin Luo,Xiangying Sun
Graphical NCDs-1, which is the first carbon dot by the microwave method using ethylenediamine and L-arginine, can serve as an efficient heterogeneous catalyst for the synthesis of cyclic carbonates from epoxides with CO 2 and Knoevenagel condensation under mild and solvent-free condition. A simple and convenient method for catalytic reactions with amine-terminated carbon dots was developed. Carbon dots (CDs) as new efficient catalysts have been developed for the Knoevenagel condensation reaction and the synthesis of cyclic carbonates under solvent-free conditions. Six kinds of carbon dots with different numbers of amino groups were synthesized. The amine-terminated carbon dot (NCDs-1) was synthesized using arginine and ethylenediamine by a microwave technique, and its catalytic action was studied. NCDs-1 with the highest numbers of amino groups was used as new metal-free and effective heterogeneous catalysts to perform essential Knoevenagel condensation and cycloaddition reactions in solvent-free conditions. 1 H NMR was used to demonstrate the Knoevenagel condensation mechanism, in situ Fourier infrared spectroscopy was used to investigate CO 2 cycloaddition and a catalytic mechanism was postulated. NCDs-1 showed a yield of 96.3±1.5 % for Knoevenagel condensation of benzaldehyde and malononitrile. In addition, NCDs-1/TBAB showed a yield of (97.0±1.0 %) of 4-phenyl-1,3-dioxolan-2-one for styrene oxide at 100 °C and 0.1 MPa in 1.5 h. A simple and convenient method for catalytic reactions with amine-terminated carbon dots was developed.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）