Arabian Journal of Chemistry
·
2020
·
IF 4.762
Hang Yu,Jing Wang,Jun-xia Yu,Yi Wang,Ru-an Chi
Adsorption performance and stability of the carboxyl groups modified straws and their extracts of cellulose, lignin, and hemicellulose for Pb 2+ were investigated, and the optimum pH range for Pb 2+ adsorption was determined by considering both the stability and capacity of the modified biosorbents for the first time. Results showed that adsorption capacity and stability of the straws and extracts were both improved significantly after modification. Adsorption capacities of the modified straws and extracts followed the order: modified hemicellulose > modified lignin, modified straw > modified cellulose, while stability of them followed the reverse order. In the optimum pH range from 4.0 to 5.0, modified rape and cotton straw showed better stability than the modified maize straw, and total organic carbon (TOC) values determined from the two modified straws and extracts were lower than 5.0 mg L −1 even after adsorption for 30 days, which reached the drinking water standard in China.
研究领域:
环境科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Hongye Huang,Meiying Liu,Junyu Chen,Liucheng Mao,Guanjian Zeng,Yuanqing Wen,Jianwen Tian,Naigen Zhou,Xiaoyong Zhang,Yen Wei
Recently, fullerene (C 60 ) and its derivatives have attracted tremendous research interest in diverse fields owing to their excellent fluorescence and biological properties. In this work, the carboxyl groups containing fluorescent C 60 COOH nanoparticles have been prepared via a one-step thiol-ene click reaction for the first time. Then, we would further demonstrate that C 60 COOH nanoparticles possess excellent water dispersibility, low cytotoxicity, outstanding fluorescence properties and uniform minuscule based on various characterization techniques. On account of these advantages, we further evaluate their performance in cell imaging. Furthermore, the carboxyl groups on the surface of C 60 COOH nanoparticles could not only improve their water dispersibility, but also be potentially used to conjugate with various biomolecules and drug molecules. Based on these carboxyl groups, we loaded the anticancer agent cisplatin on C 60 COOH nanoparticles and further explore their potential for controlled drug release. Taken together, we have developed a novel thiol-ene click reaction for preparation of carboxyl groups functionalized fluorescent C 60 based nanoparticles, which showed great potential for biological imaging and potential for intracellular controlled drug delivery. More importantly, this strategy developed in this work should also be expanded for fabrication of other fluorescent C 60 based nanoparticles through utilizing different thiol-containing compounds and other fluorescent carbon nanoparticles. Therefore, this work will provide some novel ideas for the preparation of various fluorescent carbon nanoparticles for theranostic applications.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2024
·Vol. 47
·期 11
·2400013
·
IF 2.8
Bingmei Lai,Haoyun Hu,Ningli Tang,Yipeng Huang,Guihua Ruan
In this study, monodisperse, uniform, and spherical covalent organic frameworks (COFs) were synthesized using 1,3,5-tris (4-aminophenyl) benzene and 1,3,5-tricarboxaldehyde benzene at room temperature. Post-modification of 6-aminocaproic acid on the COFs yielded carboxyl-modified COFs (COFs-COOH). The modification enhanced the hydrophilicity and adsorption efficiencies of COFs-COOH for malachite green (MG) and crystal violet (CV). A COFs-COOH-based dispersive solid-phase extraction coupled with high-performance liquid chromatography was developed for the analysis of MG and CV. The method showed a linear range from 10 to 1000 ng/mL with detection limits of 1.82 and 0.70 ng/mL for MG and CV detection, respectively. The recoveries of MG and CV from water samples collected from fish farms and markets ranged from 91.63% to 107.10% with relative standard deviations below 5%. Reproducibility tests demonstrated that the adsorption efficiencies of COFs-COOH were maintained at above 85.86% over 15 cycles. The study verified the potential of COFs-COOH as sorbents for the enrichment and separation of triphenylmethane dyes from complex samples.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Shiwen Song,Jing Ai,Aibin Hu,Guiying Liao,Dongsheng Wang
In this study, we employed hyper-cross-linked porous polymer (HCP-MAH) as precursor to prepare carboxyl-modified hyper-cross-linked polymer (HCP-COOH) through mild alkaline modification. The prepared HCP-COOH had excellent dispersity in water, high specific surface area and abundant pore structures, resulting in highly-efficient adsorption of tetracycline (TC). The TC adsorption capacity of HCP-MAH and HCP-COOH was calculated to be 273.22 mg·g −1 and 418.41 mg·g −1 , respectively. Moreover, both of HCP-MAH and HCP-COOH showed excellent adsorption capacities towards dyes and phenols . The electrostatic attraction, pore filling, hydrogen bond , ions exchange and π-π interaction were responsible for TC adsorption. In addition, it was found that the dissolved organic matter (DOM) in the secondary wastewater could promote the removal of TC, which contributed to higher adsorption removal of TC by HCP-MAH and HCP-COOH compared to that in pure water system. This study not only provided a simple method to fabricate an eco-sufficient adsorbent with rich carboxyl groups for TC removal, but also evaluated the application of the adsorbents in the treatment of water-soluble organic pollutants in actual wastewater, which has a great potential in practical use.
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
CELLULOSE
·
2019
·Vol. 26
·期 8
·5051-5063
·
IF 3.917
Wang Xue,Jiang Shengjun,Cui Sheng,Tang Yinhan,Pei Zifan,Duan Haoran
Abstract The pore structure of the regenerated cellulose hydrogel was used as a microreactor for generating magnetic MnFe 2 O 4 nanoparticles via in situ co-precipitation technology. Sodium periodate and sodium chlorite were used as oxidants, and the carboxyl modification of magnetic cellulose aerogels was achieved through a two-step oxidation reaction. The method used was convenient and environmental-friendly, and the raw materials were also green and non-toxic. The addition of magnetic nanoparticles promoted the adsorption and enabled the recycling of materials. The results showed that the adsorption equilibrium time was only 120 min and adsorption capacity could be increased by increasing the adsorption temperature. The maximum adsorption capacity of Cu(II) was 73.70 mg/g at 25 °C when the initial concentration of solution was150 mg/L. The adsorption behaviour towards Cu(II) followed the pseudo-secondary reaction kinetics and the Langmuir isotherm adsorption model. According to the results of XPS, carboxyl and hydroxyl groups were the main active adsorption sites for Cu(II). Moreover, all the composite aerogels exhibited good reusability and could be easily separated from the water after adsorption. Graphical abstract The pore structure of the regenerated cellulose hydrogel was used as a microreactor for generating magnetic MnFe 2 O 4 nanoparticles via in situ co-precipitation technology. Sodium periodate and sodium chlorite were used as oxidants, and the carboxyl modification of magnetic cellulose aerogels was achieved through a two-step oxidation reaction. According to the results of XPS, carboxyl and hydroxyl groups were the main adsorption sites for Cu(II). Moreover, all the composite aerogels exhibited good reusability and could be easily separated from the water after 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
JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Yan Wang,Bin Peng,Yuanyuan Gong,Yingrong Xie,Tingting Feng,Xiaolin Liu,Bowei Chen,Yong Zhang
High-efficient and fast extraction of uranium is of great significance not only for environmental remediation, but also meeting the shortage of uranium storage. A novel type of porous indole-based polymer (PHTPIAAs) decorating with amino acid and carboxyl groups was fabricated by a simple Friedel-Crafts acylation reaction. The as-prepared PHTPIAAs possessed encouraging and effective elimination properties for uranium in aqueous solution by taking advantages of the cooperativity of cation-π interaction and complexation. The experimental results showed that the PHTPIAA-2 exhibited ultrafast uptake rate (50.0 min) to uranium with a high removal efficiency of 97.2%, and the maximal uptake capacity was up to 457 mg g −1 calculated by Langmuir model at 298 K. The regeneration of PHTPIAA-2 was fulfilled expediently with hydrochloric acid (HCl, 0.1 mol L −1 ) as eluant, and the removal efficiency of the reborn PHTPIAA-2 maintained 80.2% after 5 cycles. These findings demonstrated that this new indole-based polymer could be considered as a valuable material in the extraction and recovery of uranium from various uranium-containing aqueous solutions.
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
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Ruiyin Xie,Xiaohui Xing,Xin Nie,Xunsong Ma,Quan Wan,Qingsong Chen,Zixiong Li,Jingxin Wang
The ubiquitous nanoplastics (NPs) in the environment are emerging contaminants due to their risks to human health and ecosystems. The interaction between NPs and minerals determines the environmental and ecological risks of NPs. In this study, the deposition behaviors of carboxyl modified polystyrene nanoplastics (COOH-PSNPs) with goethite (α-FeOOH) were systematically investigated under various solution chemistry and organic macromolecules (OMs) conditions (i.e., pH, ionic type, humic acid (HA), sodium alginate (SA), and bovine serum albumin (BSA)). The study found that electrostatic interactions dominated the interaction between COOH-PSNPs and goethite. The deposition rates of COOH-PSNPs decreased with an increase in solution pH, due to the enhanced electrostatic repulsion by higher pH. Introducing cations or anions could compress the electrostatic double layers and compete for interaction sites on COOH-PSNPs and goethite, thereby reducing the deposition rates of COOH-PSNPs. The stabilization effects, which were positive with ions valence, followed the orders of NaCl ≈ KCl < CaCl 2 , NaNO 3 ≈ NaCl < Na 2 SO 4 < Na 3 PO 4 . Specific adsorption of SO 4 2− or H 2 PO 4 − caused a potential reversal of goethite from positive to negative, leading to the electrostatic forces between COOH-PSNPs and goethite changed from attraction to repulsion, and thus significantly decreasing deposition of COOH-PSNPs. Organic macromolecules could markedly inhibit the deposition of COOH-PSNPs with goethite because of enhanced electrostatic repulsion, steric hindrance, and competition of surface binding sites. The ability for inhibiting the deposition of COOH-PSNPs followed the sequence of SA > HA > BSA, which was related to their structure (SA: linear, semi-flexible, HA: globular, semi-rigid, BSA: globular, with protein tertiary structure) and surface charge density (SA > HA > BSA). The results of this study highlight the complexity of the interactions between NPs and minerals under different environments and provide valuable insights in understanding transport mechanisms and environmental fate of nanoplastics in aquatic environments.
研究领域:
环境科学
·
生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2017
·Vol. 33
·期 9
·1898-1904
·
IF 0.767
YAO Chan,LI Guo-Yan,XU Yan-Hong
Polar groups in the skeletons of conjugated microporous polymers (CMPs) play an important role in determining their porosity and gas sorption performance. Understanding the effect of the polar group on the properties of CMPs is essential for further advances in this field. To address
this fundamental issue, we used benzene, the simplest aromatic system, as a monomer for the construction of two novel CMPs with multi-carboxylic acid groups in their skeletons (CMP-COOH@1 and CMP-COOH@2). We then explored the profound effect the amount of free carboxylic acid in each polymer
had on their porosity, isosteric heat, gas adsorption, and gas selectivity. CMP-COOH@1 and CMP-COOH@2 showed Brunauer-Emmett-Teller (BET) surface areas of 835 and 765 m2·g-
1, respectively, displaying high potential for carbon dioxide storage applications.
CMP-COOH@1 and CMP-COOH@2 exhibited CO2 capture capabilities of 2.17 and 2.63 mmol·g-
1 (at 273 K and 1.05 × 105 Pa), respectively, which were higher than those of their counterpart polymers, CMP-1 and CMP-2, which showed CO2
capture capabilities of 1.66 and 2.28 mmol·g-
1, respectively. Our results revealed that increasing the number of carboxylic acid groups in polymers could improve their adsorption capacity and selectivity.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yue-Xin Song,Zheng Wang,Ying-Hui Zhang
The design of photocatalysts based on covalent organic frameworks (COFs) has attracted considerable interest. Nevertheless, the low efficiency in separating photogenerated carriers remains a substantial challenge. Herein, carboxyl modification is employed to enhance the separation efficiency of photogenerated carriers within imine-based porphyrin COFs through the resultant built-in electric field, thereby improving the photocatalytic performance of COFs in hydrogen evolution from water splitting. Spectroscopic and electrochemical analyses reveal that, compared with pristine two-dimensional porphyrin-based COFs (Por-COF), an isostructural carboxyl-modified COF (Por-COOH-COF) exhibits a prolonged excited-state lifetime, reduced exciton binding energy and decreased deactivation probability via radiative processes, and an improved photocurrent response. These improvements result in a hydrogen evolution of 12773 ± 297 μ mol⋅g −1 ⋅h −1 for Por-COOH-COF, approximately four times higher than that of Por-COF (3351 ± 197 μmol⋅g −1 ⋅h −1 ), positioning it among the most efficient metal-free COF photocatalysts reported to date. Density functional theory calculations and in situ X-ray photoelectron spectroscopy analyses indicate that carboxyl modification facilitates charge transfer from the porphine core to the active site of the imine bond (–C N–) under the ultraviolet–visible light irradiation, thereby contributing to the remarkable photocatalytic activity of Por-COOH-COF. This study elucidates how carboxyl groups positively influence photogenerated carrier separation within COFs and provides valuable insights into the development of high-performance metal-free COFs photocatalysts.
研究领域:
材料科学
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2018
·Vol. 317
·期 3
·1419-1428
·
IF 1.181
Ouyang Jinbo,Wang Yun,Li Tianqi,Zhou Limin,Liu Zhirong
The carboxyl-modified multiwalled carbon nanotubes were immobilized in chitosan-based composite membranes (CS-CNTs) which were used as efficient sorbents for U(VI) sorption. The incorporation of CNTs in the CS-CNTs membranes improves their mechanical strength as well as U(VI) sorption performance. XPS analysis indicates that both amine and carboxyl groups are responsible for the complexation of U(VI). The sorption kinetics followed the pseudo-second order equation, whereas the sorption isotherms fitted well with Langmuir model ( q m = 126.7 mg g −1 at 298 K). Moreover, the U(VI)-loaded CS-CNT8 can be effectively desorbed by 0.2 M acidified EDTA and reused.
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
APPLIED SURFACE SCIENCE
·
2012
·
IF 2.103
Ling Zhu,Xiaoyan Liu,Tong Chen,Zhigang Xu,Wenfu Yan,Haixia Zhang
The periodic mesoporous organosilicas (PMO) with an organobridged ( CH 2 ) was synthesized and functionalized with amino or carboxylic groups by post-synthesis methods. The functionalized PMO by changing the hydrophilic/hydrophobic property and the net charge could be used to selectively adsorb and purify proteins with different shapes and different isoelectric points (pI). The experimental result showed that Bovine serum albumin (BSA) was adsorbed quicker than hemoglobin (Hb) on the materials, and lysozyme (Lys) could not be adsorbed on these PMO materials at all. The adsorption capacity of amino groups modified PMO (PMO-(NH 2 ) 2 ) for BSA was 44.67 mg/g and 300.0 mg/gfor Hb on carboxylic groups modified PMO (PMO-(COOH) 2 ). The adsorption behavior of proteins was affected strongly by the interaction among different constituents in the mixture of proteins. In addition, it is found that the adsorption rate of (PMO-(NH 2 ) 2 for adsorption of proteins was much slower than PMO-(COOH) 2 .
研究领域:
生物材料
·
纳米医学
·
蛋白质工程
·
分离科学
·
生物化学
✓ 已验证
DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2024
·
IF 6.2
Meimei Ran,Xin Nie,Jingxin Wang,Ruiyin Xie,Xiaoping Lin,Hanjun Zhu,Quan Wan,Yuhong Fu
In aquatic environments, the deposition behaviors of nanoplastics (NPs) are closely associated with interfacial interaction between NPs and iron (hydr)oxides minerals, which are typically coupled with solution chemistry and organic matter. However, the roles of solution chemistry and organic matter in the deposition behavior of NPs with iron (hydr)oxides minerals and related interfacial interaction mechanism are still poorly understood. In this study, the deposition behaviors of carboxyl-modified polystyrene nanoparticles (COOH-PSNPs) with magnetite were systematically investigated. The results showed that electrostatic attraction, hydrogen bond, and charge-assisted hydrogen bond (CAHB) were the main forces for the deposition and interfacial interaction mechanism between COOH-PSNPs and magnetite. Increasing pH could significantly inhibit the deposition of COOH-PSNPs with magnetite. At pH 6.5, phosphate and dichromate significantly inhibited the deposition of COOH-PSNPs since their competitive adsorption for the surface sites on magnetite led to a potential reversal of magnetite, resulting in the strong electrostatic repulsion between COOH-PSNPs and magnetite. Moreover, when the concentration of phosphate exceeded 0.01 mM, the deposition of COOH-PSNPs was completely hindered. Organic macromolecules (OMs) markedly inhibited the interfacial interaction and deposition of COOH-PSNPs with magnetite by enhancing the electrostatic repulsion and steric hindrance between COOH-PSNPs and magnetite due to the formation of magnetite-OM associations. The inhibition abilities followed the order sodium alginate (0.1 mM) > humic acid (0.2 mM) > bovine serum albumin (5 mM). This study may provide insights for better understanding of environmental behaviors of COOH-PSNPs associated with magnetite and organic matter in natural environments at the molecular level.
研究领域:
环境科学
·
纳米材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）