CELLULOSE
·
2019
·Vol. 27
·期 1
·415-428
·
IF 3.917
Zhao Yushuang,Jing Shuangshuang,Peng Xinwen,Chen Zehong,Hu Yijie,Zhuo Hao,Sun Runcang,Zhong Linxin
Abstract Carbon dots (CDs), with high photostability, tunable excitation and emission wavelength, excellent biocompatibility, and environmental friendliness, attract great interest because of their promising applications in various fields. The synthesis of CDs from renewable biomass is especially attractive due to its sustainable and cost-efficient feature. However, one of the major problems for this route is the low yield of CDs. To overcome this issue, we propose a facile, universal, and highly effective synthesis method to prepare fluorescent CDs from various biomass hydrothermal carbons (HTCs). As compared with the current methods for synthesizing biomass derived CDs, our approach offers ultrahigh yield (42.5% based on the weight of biomass and 99.0% based on the weight of HTC) that is much higher than those obtained from other methods. The physiochemical properties of the as-prepared CDs can be tuned by reaction temperature. Furthermore, the PL quantum yield is high up to 16.6%, and is correlated with the surface chemical groups and conjugated π-domains of the carbon core in CDs. The fluorescence of CDs is effectively and selectively quenched by Cu 2+ , which enables CDs applying as fluorescent Cu 2+ nanoprobe with a linear range of 0–30 μmol L −1 and a detection limit of 85 nmol L −1 . Due to simple operation, mild condition, and low cost of the process, this method have a great potential in the large-scale synthesis and application of CDs from biomass. Graphic abstract
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2015
·Vol. 31
·期 5
·730-735
·
IF 0.875
Xu Panpan,Wang Chunfeng,Sun Dong,Chen Yujuan,Zhuo Kelei
A facile approach was reported for the synthesis of nitrogen- and sulfur-co-doped carbon dots(N/S-CDs) by the sulfuric acid carbonization of 1-butyl-3-methylimidazolium 2-amino-3-mercaptopropionic acid( L -cysteine) salt([C 4 mim][Cys]) ionic liquid. The as-prepared N/S-CDs exhibited a good solubility, excitation-dependent emission behavior, and high resistance to photobleaching. Furthermore, the N/S-CDs were employed as a fluorescent probe for detecting Cu 2+ in real water samples with satisfactory recovery.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Shuo Geng,Shu Min Lin,Nian Bing Li,Hong Qun Luo
As an important heavy metal ion, copper has the negative influence on otherwise healthy individuals, so establishing a valid way for the highly efficient, sensitive, and quantitative determination of Cu 2+ ion becomes an emergency in the environmental analysis. In the present work, water-soluble luminescent ZnO quantum dots (QDs) capped by polyethylene glycol (PEG) have been synthesized by a simple solution method. The PEG capped ZnO QDs (PEG@ZnO QDs) showed yellow fluorescence. High-resolution transmission electron microscopy, UV–vis absorption spectroscopy, Fourier transform infrared spectroscopy, and luminescence spectroscopy were applied to elucidate the properties of the PEG@ZnO QDs. In addition, the yellow fluorescence of the PEG@ZnO QDs was quenched when Cu 2+ ion was added to the PEG@ZnO QDs solutions. Therefore, a novel fluorescent probe was designed to detect Cu 2+ in water solution. The linear relationships were 10–200 nM and 2–10 μM, respectively, with the detection limit for Cu 2+ at 3.33 nM according to 3σ/slope (where σ denotes the standard deviation of the blank measures). The proposed sensor of the PEG@ZnO QDs has also been used in natural water samples to examine the availability of this method. In addition, the quenching mechanism was discussed, which may be attributed to the aggregation induced quenching.
研究领域:
环境分析
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 4
·3097-3101
·
IF 3.201
Qiaoling Liu,Nan Zhang,Haoying Shi,Wenyan Ji,Xiaoqian Guo,Wen Yuan,Qin Hu
Highly fluorescent carbon dots (CDs) are prepared by a one-step microwave heating method using citric acid, L-cysteine and dextrin as the precursors. The average size of the CDs is 2.61 nm with good water dispersibility and photostability. Compared with undoped CDs, small amounts of nitrogen (N) and sulfur atom (S) co-doped CDs exhibit a red shift of the absorption spectra to the visible region and lead to a high quantum yield of 22%. Due to the large amount of carboxyl and hydroxyl groups (−COOH and −OH) on the surface of the CDs, Cu2+ is selectively detected in aqueous solution at pH 7.0 with a detection limit as low as 20 nM, which is much lower than the maximum concentration of Cu2+ in drinking water (∼20 μM) permitted by the US Environmental Protection Agency (EPA). Moreover, the application in tap water samples further demonstrates that the as-synthesized CDs are good candidates for the monitoring of Cu2+ in environmental water samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Bo Lv,Zeya Zhao,Xiaowei Deng,Chaojun Fang,Baolin Xing,Bobing Dong
The removal of copper ions from wastewater is of great significance for reducing pollution of surrounding environments and ensuring the quality of drinking water . In this study, a liquid–solid fluidized bed with nutshell activated carbon was used to adsorb copper ions from wastewater. The fluidization characteristics and adsorption performance of the liquid–solid fluidized bed were investigated through batch, cyclic, and continuous adsorption experiments. The results showed that nutshell activated carbon had a strong adsorption capacity for copper ions in wastewater by the electrostatic adsorption function of its oxygen-containing groups, and the adsorption isotherm was fitted by the Langmuir isotherm model ( R 2 reached 0.98), which indicated a positive single-layer adsorption. The pseudo-second-order model described the adsorption process well, and the adsorption process was controlled by a continuous migration step with internal and external diffusion. The high-frequency contact between adsorbent and adsorbate in the fluidized bed layer increased its external diffusion rate, thereby promoting improved adsorption efficiency of 96% compared with 76% of the packed bed. The weight of the particle bed was the factor influencing adsorption performance the most, followed by fluidization number, and then initial concentration, indicating that the fluidization characteristics determined the adsorption efficiency. The breakthrough curve showed that the adsorption saturations of the fluidized and packed bed were 0.694 and 0.660 g/g, respectively, which demonstrated the superiority of the fluidized bed in the adsorption process.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Bihua Shen,Zhengli Guo,Bingqing Huang,Guoguang Zhang,Peng Fei,Shirong Hu
In this study, pectin (Pe) with different esterification degrees was used as raw materials to prepared hydrogel adsorbents via free radical polymerization. The effect of Pe esterification degree on hydrogel structure and adsorption performance was studied by FTIR , SEM and XPS characterization and copper ion adsorption experiment. The results demonstrated that the carboxyl group in the hydrogels was bonded to Cu 2+ through electrostatic force and coordination, which was an important factor in its adsorption capacity. The hydrogels prepared from Pe with low esterification degree had finer pores and higher carboxyl content, so the adsorption capacity on both water and Cu 2+ was stronger. The preparation of hydrogels from low-ester Pe was more conducive to the adsorption of copper ions. Besides, the adsorption behavior of the hydrogels on Cu 2+ was investigated through the adsorption thermodynamics and kinetics. The results indicated that the adsorption kinetics of the hydrogels was in accordance with the quasi-second-order model. The adsorption of Cu 2+ by hydrogels was the result of physical and chemical adsorption, which was endothermic under natural condition, and a higher temperature will result in more favorable spontaneous adsorption.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yajie Bai,Shuyu Gao,Wanru Xie,Zhenyuan Fang,Hongye Bai,Weiqiang Fan
Photoelectrochemical nitrate ions (NO 3 − ) reduction reaction (PEC NITRR) to produce ammonia (NH 3 ) at ambient conditions could not only solve the problem of NO 3 − pollution, but also transform the NO 3 − to hydrogen carrier (NH 3 ). Herein, we introduced Cu 2+ by construction of BiVO 4 /CuPc, effectively adsorbed target reactant NO 3 − and further promote its effective conversion to NH 3 . This unique catalyst structure leads to a desirable NH 3 yield (r NH3 = 12.98 μg h −1 cm −2 ) and Faraday efficiency (FE = 20.36%) at 0.1 V vs. RHE. Therefore, this work provides a new perspective for establishing a low energy consumption PEC NITRR to achieve sustainable transformation of pollutants.
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
RSC Advances
·
2023
·Vol. 13
·期 43
·30176-30189
·
IF 3.9
Wei Yang,Lei Zhang,Meng Li,Ting Zhang,Yue Liu,Juan Liu
In this work, bamboo charcoal (BC) is prepared by pyrolysis of bamboo. Then, KOH modification and surface deposition of Goethite (α-FeOOH) are performed to obtain a new KOH-modified BC loaded with α-FeOOH (FKBC) adsorbent for copper (Cu2+) and fluoride (F−) ion adsorption from aqueous solution. Surface morphology and physiochemical properties of the prepared adsorbent are characterized by scanning electron microscopy-energy dispersive spectrometer, X-ray diffraction, and N2 adsorption–desorption. The effect of pH, contact time, adsorbent dosage, and initial concentration on Cu2+ and F− adsorption is also investigated. In addition, adsorption kinetics and isotherms are fitted to pseudo-second-order kinetics and Langmuir model, respectively. Thermodynamic parameters suggest that the adsorption process is spontaneous and endothermic. The adsorption mechanism is further characterized by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The Cu2+ absorption mainly occurs through ion exchange, coordination reactions, and surface precipitation, while the F− adsorption mainly occurs via ion exchange and hydrogen bonding. The selective adsorption experiments reveal that FKBC has good selectivity for Cu2+ and F−. The adsorption–desorption experimental results indicate that FKBC can be reused for Cu2+ and F− adsorption after regeneration. Results indicate that FKBC can be a promising adsorbent for Cu2+ and F− removal from aqueous solutions.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Linyue Zhang,Jiewen Deng,Jieli Ou,Gaofeng Zhou,Yongsheng Fu,Yiqing Liu
In this paper, it was found that boric acid (BA) could improve the degradation of rhodamine B (RhB) by Cu(II)-activated peroxymonosulfate (PMS). At pH 8.5, the addition of BA could stabilize pH and generate the highly active complexes with Cu(II), which could accelerate the reduction of Cu(II) by PMS. The formed Cu(I) could activate PMS to form sulfate radical (SO 4 – ) and/or be oxidized to Cu(III). According to the results on radical scavenging experiments, SO 4 – and Cu(III) both participated in the degradation of RhB in BA/Cu(II)/PMS system. Because the binding ability of BA with Cu(II) is pH-dependent, the promotion effect of BA in Cu(II)/PMS process occurred only under weakly alkaline conditions. The presence of HCO 3 – and natural organic matter (NOM) both had an inhibition effect on RhB degradation in BA/Cu(II)/PMS system, while Cl – could promote the removal of RhB. This study provides a new idea to enhance PMS activation by Cu(II).
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOM
·
2020
·Vol. 72
·期 12
·4458-4465
·
IF 2.054
Lv Xiangyong,Liang Guangfen,Wang Qinzheng,Li Yandong,Duan Huamei,Chen Dengfu,Long Mujun,Hu Qingqing,Han Funian,Li Linpei
In this study, we prepared reduced graphene oxide (rGO) from natural graphite by a redox method. The salts Cu(NO 3 ) 2 and Ni(NO 3 ) 2 , Cu(NO 3 ) 2 and Zn(NO 3 ) 2 , Cu(NO 3 ) 2 , Ni(NO 3 ) 2 , and Zn(NO 3 ) 2 are loaded onto rGO by an impregnation method. The support material is calcined to obtain the fresh catalyst. The catalysts are analyzed by thermogravimetric analysis, x-ray diffraction, x-ray photoelectron spectroscopy, Raman analysis, and scanning and transmission electron microscopic imaging. The results showed that Ni and Zn are evenly distributed on the carrier. The size of the copper crystals in CuNi-rGO and CuZn-rGO is smaller than that of Cu-rGO. The smaller the copper crystal, the more easily Cu 2+ can be reduced to Cu 0 and Cu + .
The addition of Ni and Zn can promote reduction of Cu 2+ to Cu 0 and Cu + and may significantly improve the catalytic performance.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Dong Zhang,Xiaohui Pang,Xinfu Zhu,Yi Wang,Meiqing Zhu
Background Although copper ions (Cu 2+ ) and glyphosate (GLY) tend to exist in the environment or living organisms at low doses, they gradually accumulate with exposure time and may eventually cause irreversible damage to living organisms. The existing detection methods are effective, but most of them lack the ability to detect multiple pollutants simultaneously or suffer from low sensitivity and poor selectivity. Therefore, it is important to develop a sensor that can efficiently and sensitively detect copper ions and glyphosate, but also has the potential for practical applications. Results In this study, a novel hydrazide-based DHBC capable of sequentially detecting Cu 2+ and glyphosate (GLY) was developed. The DHBC forms a complex with Cu 2+ , causing fluorescence quenching. Upon exposure to GLY, functional groups such as carboxyl, phosphate, and amino groups coordinate with Cu 2+ , displacing DHBC and restoring fluorescence intensity. The mechanism has been validated by various characterization methods such as HRMS and Job curves, DFT calculation, etc. The DHBC has excellent detection performance, including high selectivity, strong anti-interference, fast response (less than 1 min), and high sensitivity (Cu 2+ : 0.09 μM, GLY: 0.05 μM). The quantitative analysis of Cu 2+ /GLY in cycling experiments and actual samples demonstrated the great potential of DHBC for practical applications. The DHBC successfully imaged Cu 2+ /GLY in live models such as HeLa cells and zebrafish, demonstrating its broad applicability and stability in a wide range of biological models. Significance The high accuracy of DHBC in environmental pollution monitoring and its stable performance in biological modeling make it an important tool for assessing the impact of pollutants on ecosystems and human health. In addition, the wide applicability and real-time imaging capability of DHBC provide reliable technical support for environmental science, toxicology, and health risk assessment and have important prospects for scientific research and practical applications.
研究领域:
环境科学
·
生物化学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Xuyong Tang,Fengxi Li,Sijun Huang,Li Xu,Lei Wang,Yi Guo
Nicotinamide-adenine dinucleotide (NADH) as biomimetic units combined with copper ion to form laccases mimics (Cu-NADH). Cu-NADH has the enhanced activity of copper center to mediate aryl C–H amination using air as green oxidants. It could successfully catalyze oxidative coupling between different aromatic compounds and 4-phenylurazole (yield: 72 ∼ 91 %). Recycling catalytic ability (up to 6 times) showed its excellent stability. The Cu-NADH nanozyme was certificated to catalyze C–H amination effectively, and highlighted that it was a proper way to design catalysts according to enzyme-like catalyzing non-natural reaction.
研究领域:
生物化学
·
催化化学
·
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）