Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Chunlai Liu,Na Wang,Zelin Meng,Mingyang Song,Heming Zhao,Jianglei Hu,Fengwei Shi
The Knoevenagel reaction is one of the most significant reactions in the industrial synthesis of organic materials, pharmaceuticals, and biological compounds. In this study, 2-cyanoethyltriethoxysilane (CTES) was employed as a functionalizing agent to prepare carboxyl-functionalized silica (SBA-16-Cx) using a one-pot method. Subsequently, carboxyl groups served as anchoring points for Cr³⁺, and MOFs-modified SBA-16 (SBA-16-Cx@MIL) was obtained by in situ synthesis. The resulting materials were characterized using FT-IR, XPS, XRD, N 2 adsorption-desorption analysis, SEM, TEM, 13 C MAS NMR, and TG, which confirmed the successful synthesis of MIL-101 on the support. Meanwhile, the pore size of the composite was reduced from 5.1 nm (SBA-16) to 0.6 nm (SBA-16-C1.0@MIL). The condensation reaction of benzaldehyde with malononitrile was selected as a model reaction. The effects of various factors, including solvents, reactants molar ratios, temperature, catalyst dosage, and reaction time, on the reaction were studied. Under optimized conditions, the conversion rate of benzaldehyde reached 100 % and the catalyst demonstrated excellent stability for repeated use. The reaction follows second-order kinetics (R 2 >0.99), and the activation energy of the reaction was 17.18 kJ/mol. Finally, the mechanism of the catalytic process was proposed. This work provides a green catalytic route for the synthesis of α,β-unsaturated carbonyl compounds.
研究领域:
材料科学
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催化化学
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有机合成
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产品关联
DOI
高影响因子
Polymers
·
2017
·Vol. 9
·期 12
·681
·
IF 3.364
Jianbo Tan,Xueliang Li,Jun He,Qin Xu,Yuxuan Zhang,Xiaocong Dai,Liangliang Yu,Ruiming Zeng,Li Zhang
Herein, we report a photoinitiated reversible addition-fragmentation chain transfer (RAFT) dispersion copolymerization of methyl methacrylate (MMA) and methyl methacrylic (MAA) for the preparation of highly monodisperse carboxyl-functionalized polymeric microspheres. High rates of polymerization were observed, with more than 90% particle yields being achieved within 3 h of UV irradiation. Effects of reaction parameters (e.g., MAA concentration, RAFT agent concentration, photoinitiator concentration, and solvent composition) were studied in detail, and highly monodisperse polymeric microspheres were obtained in most cases. Finally, silver (Ag) composite microspheres were prepared by in situ reduction of AgNO3using the carboxyl-functionalized polymeric microspheres as the template. The obtained Ag composite microspheres were able to catalyze the reduction of methylene blue (MB) with NaBH4as a reductant.Keywords:carboxyl-functionalized microspheres;RAFT polymerization;photoinitiated dispersion polymerization
研究领域:
材料科学
·
高分子化学
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Hanmeng Yuan,Lu Xing,Jia Wei,Zhimin Zhao,Junlei Wang,Hongshuai Gao,Yi Nie
Heavy metal contamination is widely present in the spinning field. Some heavy metal ions such as Fe 3+ may accumulate in the coagulation bath using ionic liquids (ILs) as green solvents to prepare regenerated cellulose fibers (RCFs), which seriously affect the performance of RCFs and the subsequent regeneration of ILs. This study proposed a new strategy to selectively adsorb Fe 3+ from ILs aqueous solution using carboxyl-functionalized wood microchannel (CW). The CW was optimized by citric acid concentration, reaction time, and temperature using carboxyl group contents as an indicator. The physic-chemical properties of CW were characterized, and its adsorption performance for Fe 3+ was also evaluated in a water system. Furthermore, the adsorption selectivity of CW for Fe 3+ and ILs was investigated. The results demonstrate that the CW had a high adsorption ratio for Fe 3+ (94.73%), while that for ILs was 4.20%. The selective adsorption mechanism, in which the Fe 3+ is mainly separated from ILs aqueous solution by complexation with carboxyl group, was confirmed by FTIR, XPS, MIP, and DFT calculation. Accordingly, this paper may provide a new strategy to selectively adsorb Fe 3+ from ILs aqueous solution, thus offering an economical and efficient method for ILs recovery and water purification .
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 51
·期 3
·1344-1353
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IF 2.371
Yang Xia,Meng Nannan,Zhu Yuanchao,Zhou Yifeng,Nie Wangyan,Chen Pengpeng
In this work, molybdenum disulfide (MoS 2 ) nanosheets were employed to enhance the mechanical and thermal properties of chitosan (CS), which was one of the most promising biomaterials. In order to promote a homogeneous dispersion of MoS 2 and improved interface interactions between CS and fillers, carboxyl functionalization was subjected to the exfoliated MoS 2 nanosheets by chemical conjugation with thioglycolic acid before compositing with CS. Afterward, the CS/MoS 2 – g –COOH composite films were prepared by a simple solution blending method. Micromorphology characterizations showed that MoS 2 – g –COOH nanosheets dispersed much better than unmodified MoS 2 nanosheets, which was considered to be quite beneficial for the enhanced properties of CS nanocomposites. DMA results indicated that the mechanical properties of CS were improved by incorporating with MoS 2 – g –COOH nanosheets compared with neat CS and unmodified MoS 2 -filled CS. The thermal stability of CS/MoS 2 – g –COOH was also improved. This work demonstrated a promising route to prepare MoS 2 -based polymer nanocomposites with excellent performances.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
Materials Today Communications
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2024
·
IF 3.7
Peihang Shen,Zelong Liu,Yibo Zhang,Zelin Meng,Mingyang Song,Heming Zhao,Jianglei Hu,Fengwei Shi
Vinyl-functionalized SBA-15 was synthesised using a one-pot co-condensation method followed by carboxylation via nitric acid, with the intermediate product named SBA-15C. MIL-68 was then synthesised in-situ by adsorption of Al 3 + ions via carboxylate groups on SBA-15C to give the composite xMIL-68(Al)@SBA-15C. A series of characterizations were conducted by Fourier transform infrared spectroscopy, Brunner-Emmet-Teller measurements, X-ray diffraction, X-ray photoelectron spectroscopy, Scanning electron microscope, and Transmission Electron Microscope. xMIL-68(Al)@SBA-15C maintained robust catalytic performance in the NaBH 4 -mediated reduction of 4-nitrophenol to 4-aminophenol, with no significant decrease in activity after five cycles of reuse.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2024
·
IF 4.8
Chunlai Liu,Wei Wang,Na Wang,Zelong Liu,Peihang Shen,Jianglei Hu,Fengwei Shi
Wastewater containing heavy metal ions, such as Cu 2+ , that are released into the environment will cause irreparable damage to the nature and human health of living. It is, therefore, absolutely crucial to remove these toxic ions from water. Herein, this paper utilizes the cyano group as a functional reagent to prepare carboxyl-functionalized SBA16 for adsorbing Cu 2+ in water. In this paper, 2-cyanoethyltriethoxysilane is employed as a functionalizing reagent to prepare carboxyl-functionalized SBA16 through a one-pot method. The prepared material was characterized using various techniques, such as WXRD, TEM, FT-IR, and XPS. The results indicated that the introduction of the functionalizing reagent did not disrupt the original cage-like cubic mesoporous structure (Im3m symmetry) of SBA16. Crucial adsorption factors, namely pH, adsorbent dosage, Cu 2+ initial concentration, and contact time, affecting the removal of Cu 2+ were monitored and the optimum adsorption conditions were determined. Isotherm and kinetic investigations were conducted and a non-linear fitting method of experimental data was used to obtain isotherm and kinetic parameters. Maximum adsorption capacity reaches 181.3 mg g −1 was achieved in 60 min at pH = 3. Adsorption kinetics and adsorption isotherm followed the pseudo-second-order (R 2 = 0.999) and Langmuir (R 2 = 0.999) models, respectively. This suggests that the adsorption process primarily involves chemisorption and monolayer coverage. Thermodynamic parameters showed the spontaneous and endothermic nature of the adsorption process. After 5 cycles, the adsorbent still maintains a good adsorption capacity for Cu 2+ . This suggests promising applications for the adsorbent in treating wastewater containing Cu 2+ .
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
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2017
·
IF 6.035
Huijuan Zhang,Bin Li,Jiefeng Pan,Yawei Qi,Jiangnan Shen,Congjie Gao,Bart Van der Bruggen
Novel carboxyl-functionalized graphene oxide (CFGO)/polyamide (PA) nanofiltration (NF) membranes were prepared via interfacial polymerization (IP) of piperazine (PIP) and trimesoyl chloride (TMC). CFGO was fabricated by a chemical modification (ring opening followed by esterification) to the epoxide ring of GO. CFGO was then introduced in the PIP aqueous phase as an additive in the IP reaction. Compared with a pristine PA reference membrane, both the GO/PA and CFGO/PA membrane have an enhanced permeability (the optimum concentration of GO and CFGO in the membrane was 0.05% and 0.07%, and the corresponding water flux is 96.5 and 112.1 L/m 2 /h, respectively),with a slight decrease of the salt rejection. In dye desalination experiment, the permeation flux of 0.05%GO/PA membrane is only 75.5 L/m 2 /h, with 98.1% rejection of New Coccine (a dye with negative charge) and 28.7% retention for NaCl. For 0.07%CFGO/PA membrane, it can cut off 25.0% NaCl and 95.1% New Coccine, and its permeation flux can reach 110.4 L/m 2 /h, which shows that the CFGO/PA membrane could be potentially applied to the dye desalination and concentration process . The CFGO/PA membrane shows better performances in permeability and dye desalination than GO/PA membrane, due to the significantly increased hydrophilicity and enhanced surface charge density.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Chenghan Ji,Mujian Xu,Hang Yu,Lu Lv,Weiming Zhang
The development of heavy metal adsorbents with high selectivity has become a research hotspot due to the interference of coexisting ions (e.g., Na + , Ca 2+ ) in the actual wastewater, but the more difficult regeneration caused by high adsorption selectivity severely limits its practical applications. Herein, a carboxyl adsorbent, MIL-121, demonstrated high adsorption selectivity for heavy metals at 10,000 mg/L of Na + (removal > 99% for Cu 2+ ) as well as unexpected easy regeneration (desorption > 99%) at low H + concentration (10 −3.5 –10 −3.0 M), which is hundreds of times lower than that of ever reported selective adsorbents (> 10 −1 M H + ). X-ray photoelectron spectrometry (XPS), extended X-ray absorption fine structure (EXAFS) coupled with Density functional theory (DFT) simulation unveil that the -COOH groups in MIL-121 for heavy metals adsorption is specific inner-sphere coordination with higher binding energy (1.31 eV for Cu), and less energy required for regeneration (0.26 eV for H). Similar high selectivity and easy regeneration were also satisfied with other heavy metals (e.g., Pb 2+ , Ni 2+ ), and removal of heavy metals remained > 99% in 10 consecutive adsorption-desorption cycles. For actual copper electroplating wastewater treatment , MIL-121 could produce ~ 3600 mL clean water/g sample, outperforming 300 mL that of the benchmark commercial adsorbent D-113. This study shows the potential of MIL-121 for heavy metal wastewater treatment and provides mechanistic insight for developing adsorbents with high selective adsorption and easy regeneration.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Tuckyun Cheang,Wenbin Huang,Weiping Li,Siyu Ren,Haihui Wen,Ting Zhou,Yongcheng Zhang,Weihao Lin
Exploring efficient adsorbent for heavy metals remediation from wastewater and contaminated soil is a pursuing issue. Robust functionalized metal-organic frameworks (MOFs) represent one of burgeoning scavengers because of their tunable structural topology , designable functionalities and extraordinary affinity for heavy metal ions . In this present work, we report a facile and versatile strategy to synthesize a series of carboxyl-functionalized MIL-101(Fe) derivatives by microwaving a solution of organic ligands with varying carboxyl number and Fe 3+ ions. The resulting MIL-101(Fe) derivatives were characterized using various techniques including scanning electron microscope (SEM), powder X-ray diffraction, Fourier transformed infrared, Brunauer–Emmett–Teller specific surface area and X-ray photoelectron spectroscopy. The intrinsically carboxyl-rich characteristic and large surface area of MIL-101-(COOH) 2 afford fast adsorption kinetics (< 15 min) and high saturation capacity (467.6 mg/g) for Pb(II). Strikingly, it can efficiently capture Pb(II) possessing impressive adsorption efficiencies (> 90%) over a wide pH range of 4.5–11.0. Moreover, the resulting MIL-101-(COOH) 2 simultaneously exhibited high affinity toward different types of heavy metal ions, including borderline Lewis acid (Pb(II), Cu(II) and Ni(II)), soft Lewis acid (Cd(II) and Hg(II)) and hard Lewis acid (Eu(III) and Cr(III)). Such impressive treatment for Pb(II)-contaminated lead-acid battery industrial wastewater (more than 96.7%) can be attributed to the coordination arising from abundant carboxyl groups in the pores of MIL architecture with target heavy metal ions. Significantly, these findings validate the exceptional potential of carboxyl-functionalized MIL-101(Fe) derivatives in the application of heavy metal ions remediation.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 17
·6216
·
IF 4.6
Hongrui Yang,Chen Wang,Wenjuan Zhu,Pingning Jin,Fei Li,Jing Fan
A simple and efficient sample pretreatment technology is very important for the accurate determination of trace drug residues in foods to ensure food safety. Herein, we report a new carboxyl group-functionalized ionic liquid hybrid solid- phase adsorbent (PS-IL-COOH) for the highly efficient extraction and quantitative determination of diclofenac sodium (DS) residue in milk samples. It was found that the adsorption efficiency of PS-IL-COOH for the ppb level of DS was greater than 93.0%, the adsorption capacity was 934.1 mg/g, and the enrichment factor was 620.0, which surpass most of the previously reported values for DS adsorbents. The high concentration of salts did not interfere with the adsorption of DS. Importantly, the recovery of DS was above 90% after 16 adsorption–-regeneration cycles. The synergistic effect of the multiple interactions was found to be the main factor for the high efficiency of DS adsorption. The proposed method was applied to the extraction and detection of DS in milk samples, with the relative recovery ranging from 88.2 to 103.0%.Keywords:carboxyl group-functionalized ionic liquid;solid-phase extraction;diclofenac sodium;milk samples
研究领域:
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Wen He,Jizhou Cao,Feiyu Guo,Zhihao Guo,Peiguo Zhou,Rui Wang,Shuang Liang,Qunyan Pang,Bairen Wei,Yue Jiao,Tripti Singh,Qiliang Fu
Heavy-metal pollution is a significant environmental issue that has raised global concern due to its harmful impact on humans and the natural ecosystem. Heavy metal pollution poses several challenges in terms of remediation, including low adsorption capacity and efficiency, scale-up issues and non-degradability. Here, we developed an eco-friendly tunable dual-wavelength absorption mesoporous wood aerogel (TDWA) for removal of Cu 2+ ions from wastewater based on wood nanotechnology and carboxylated functionalization treatment. Nanostructured pores generated from the cell walls with carboxyl groups due to the removal of most lignin/hemicellulose and 2,2,6,6-tetramethylpiperidine oxidation. Mechanical compression was parallelly applied to the transverse direction of TDWA resulted in removing micron-scale cell cavity and intercellular, which significantly improved the dynamic adsorption performance with an excellent Cu 2+ adsorption capacity of 115 mg g −1 . This value is superior to most wood-based adsorption membrane as wastewater mainly flowed through the continuous microfibril network in the cell wall. The double-layer mesoporous TDWA membrane (5 mm) possessed a favorable removal efficiency (99.83 %) even after 5-cyclic adsorption (92.34 %). The invented nanostructured TDWA membrane in the current study has promising potential to substitute the present plastic-based membrane in the realistic Cu 2+ adsorption because of the facile technology, renewability and high removal efficient, as well as the complete biodegradability.
研究领域:
环境科学
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材料科学
·
纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2021
·
IF 3.196
Qi Yao,Ruifeng Zhan,Hegang Ren,Bo Yang,Ying Yang
Stringent water resources scarcity and severe environmental restriction requires environmentally friendly and efficient scale inhibitors exploitation. Functionalization of polyamidoamine dendrimers for scale inhibitor was performed using 2-phosphate-1, 2, 4-butane tricarboxylic acid (PBTCA) and succinic anhydride (SA). In this study, PBTCA modified polyamidoamine dendrimers (PAMAM-1), SA modified first and second generation polyamidoamine dendrimers (CAMAM-1 and CAMAM-2) are prepared. Static scale inhibition method is employed to assess the scale inhibition efficiency of linear low molecular polyacrylic (LPAA), PBTCA, PAMAM-1, CAMAM-1 and CAMAM-2 against CaCO 3 and CaSO 4 . The results show that carboxyl terminated polyamidoamine dendrimers has excellent scale inhibition performance comparable to PBTCA and PAMAM-1. Compared to LPAA and PBTCA, dendritic structure can effectively improve the scale inhibition performance of the scale inhibitor. Furthermore, the scale inhibition performance enhances with increasing generation of carboxyl-terminated polyamidoamine dendrimer. The inhibition efficiency of CAMAM-2 against CaCO 3 and CaSO 4 is about 96.3% and 95.2% at a concentration of 10 mg/ L. Moreover, The CAMAM-2 performs above 85% scale inhibition at Ca 2+ concentration is 4000 mg/L and 90% scale inhibition at border pH 5–9. The FT-IR, XRD and SEM-EDX results show that the CaCO 3 changes from stable calcite to metastable aragonite and vaterite, and the needle like structure of CaSO 4 is destroyed to small crystals. CAMAM-2 only occupies the crystallization site and distorts the lattice of calcium scale in the crystal growth process rather than adsorb on the final crystal surface. This paper provides data support for the application of phosphate or carboxyl terminated polyamidoamine dendrimer in scale inhibition.
研究领域:
材料科学
·
环境科学
✓ 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）