CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Rui-hong Liang,Ya Li,Li Huang,Xue-dong Wang,Xiao-xue Hu,Cheng-mei Liu,Ming-shun Chen,Jun Chen
Ethylenediamine-modified pectins (EPs) with different degrees of amidation (DA) were prepared and characterized by Fourier Transform Infrared spectra (FTIR), elemental analysis, X-ray photoelectron spectroscopy (XPS). The prepared EPs were then used to remove Pb 2+ from the aqueous solution. It was found that EPs with the highest DA (EP 48 ) exhibited great removal efficiency of Pb 2+ (≥94 %) at low concentrations of 40−80 mg/L. The zeta potential analysis showed that EP 48 had the fastest increase in zeta potential when Pb 2+ was continuously added and was the first to be electroneutralized. Particle size analysis further confirmed that EP 48 was the first precipitated and formed a larger EP 48 -Pb 2+ complex. The FTIR and XPS analyses indicated that Pb 2+ was adsorbed via the ion exchange of carboxylic groups and chelation with acylamino and amino groups. These results suggested that the EP 48 might be a promising adsorbent for the removal of low concentrations of Pb 2+ in contaminated water.
研究领域:
环境科学
·
材料科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Hanyu Wang,Yehong Chen,Padonou-Kengue Patrick Dorsel,Chaojun Wu
In this study, carbon dots (CDs) were prepared by a one-pot hydrothermal method using tempo-oxidized cellulose nanocrystals (TOCNC) and polyethylenimine (PEI). The CDs were self-assembled with a microsphere adsorbent prepared using TOCNC and sodium alginate (SA). CDs-TOCNC/SA—an environmentally friendly, fluorescent-sensitive, and recyclable microsphere adsorbent—was obtained. FTIR analysis showed that PEI successfully modified the CDs. In addition, the fluorescence quenching of CDs was observed when the concentration of Pb 2+ was 0.0001–100 mg/L, indicating that CDs can dynamically monitor Pb 2+ . CDs-TOCNC/SA can produce blue fluorescence under 365 nm UV light and selectively and efficiently adsorb Pb 2+ . When the concentration of Pb 2+ was 0.0001–100 mg/L, fluorescence quenching of the adsorbent was observed, indicating that CDs-TOCNC/SA could visually adsorb Pb 2+ . The adsorption isotherm and kinetic parameters show that the adsorption process conforms to the Langmuir isotherm model at 298 K, and the maximum adsorption capacity of Pb 2+ was 190.1 mg/g at pH = 5. Moreover, CDs-TOCNC/SA could still obtain 78.99 % Pb 2+ after five sorption-desorption cycles. The adsorption mechanism may involve ion exchange, electrostatic attraction, intra-particle diffusion, and chemical complexation.
研究领域:
环境科学
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材料科学
·
分析化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2017
·
IF 3.671
Yaoge Huang,Zhuqing Wang
A novel Ethylenediamine-Modified Calcium Alginate Aerogel (ECAA) was synthesized by freeze-drying method, and used to remove Pb 2+ and Cu 2+ from aqueous solutions. The prepared adsorbent was characterized by using the FTIR spectra, SEM analysis and XPS analysis . The effects of the pH, initial metal ion concentration, adsorption kinetics , and isotherms had been studied systematically. Moreover, the ECAA can be regenerated by simple acid treatment and used repeatedly. It is interesting to note that almost no Ca 2+ can be detected after the first cycle that confirmed the adsorption process involves ion exchange.The XPS spectra analyses further indicated that Pb 2+ and Cu 2+ were adsorbed via the chelation of −CO-NH, −NH 2 and −OH. The results from these studies indicated the aerogel is a promising adsorbent to separate and recover the heavy metal ions from contaminated water.
研究领域:
环境科学
·
材料科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 16
·1238
·
IF 4.3
Bingbing Zheng,Shuaigang Ge,Lingli Chen,Yijia Wen,Kaihuang Huang,Bingsuo Zou
Cd-based perovskite materials have the advantages of high emission efficiency and tunable emission, as well as broad application prospects in the field of optoelectronics. However, achieving multimode dynamic luminescence under UV light excitation in a single system is a great challenge. Here, we successfully prepared Sb3+/Pb2+co-doped Cs7Cd3Br13crystals by a simple hydrothermal method. Tunable emission from orange to white and then to blue, covering the wavelength range between 370 and 800 nm, was achieved by varying the doping concentration of Pb2+ions in Cs7Cd3Br13:0.5%Sb3+. Temperature-dependent photoluminescence (PL) spectra and density functional theory (DFT) calculations confirm that the wide-band white-light emission of Cs7Cd3Br13: Sb3+/Pb2+crystal comes from the first self-trapped exciton (STE1) of undoped Cs7Cd3Br13intrinsic capture state and the emission of free excitons (FEs) and STE2 induced by the confining effect and the Jahn–Teller effect by Pb2+incorporation, as well as the Sb triplet self-trapped exciton (STE3). More specifically, the samples with the best co-doped ratio exhibit significant excitation-wavelength-dependent luminescence characteristics and can realize the conversion of the emission color from white and blue to orange. Based on the tunable emission characteristics of three emission colors, the material has good prospects in encryption and anti-counterfeiting applications. This work provides a new strategy for the application of Cd-based halides in the field of anti-counterfeiting.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
物理化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Hongxu Guo,Dongfang Wang,Jianhua Chen,Wen Weng,Minqiang Huang,Zishan Zheng
A novel metal-organic framework (MOF) material, flake-like NH 2 -MIL-53(Cr), was prepared by a simple reflux method and then characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The as-prepared MOF was found to be an effective material for the selective electrochemical detection of microgram levels of Pb 2+ in aqueous solution. Detection was performed by square wave anodic stripping voltammetry. The NH 2 -MIL-53(Cr)-modified electrode showed excellent selectivity and stability for Pb 2+ detection. The electrochemical properties and applications of the modified electrode were studied. Operational parameters such as pH, deposition potential, and deposition time, were also optimized to detect trace amounts of metal ions. This method offers a new strategy for heavy metal detection using MOF materials.
研究领域:
材料科学
·
环境科学
·
分析化学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2017
·
IF 6.065
Wang Ren,Ying Zhang,Yu Zhu Fan,Jiang Xue Dong,Nian Bing Li,Hong Qun Luo
A resonance Rayleigh scattering (RRS) aptasensor was fabricated for detection of Pb 2+ via hairpin-like label-free substrate and G-wire for signal amplification. A hairpin-like DNA substrate contains a sequence in the loop labeled with ribonucleobase A and c-myc sequence in the stem. When hybridized with 8–17 DNAzyme in the presence of Pb 2+ , the sequence in the loop was activated and cleaved. Hundreds of c-myc sequences departing from the 8–17 DNAzyme yield nanowires superstructure called G-wire in the presence of Mg 2+ . The polymer G-wire was demonstrated by the RRS spectrum, polyacrylamide gel electrophoresis, and AFM. The RRS intensity was enhanced by the product G-wires, and the RRS signal at 370 nm was linear with the logarithm of Pb 2+ concentration in the range of 2.0 nM to 5.0 μM. This method was selective for Pb 2+ even coexisting with other metal ions at high concentrations and was successfully applied to the determination of Pb 2+ in real samples. The aptasensor holds a great promise for universal RRS sensing platform for sensitive detection of various metal ions just by changing the sequence of the probe in the loop and DNAzyme.
研究领域:
分析化学
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环境科学
·
生物化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2014
·Vol. 21
·期 3
·1-8
·
IF 1.897
Geng Tong-Mou,Wu Da-Yu,Huang Wei,Huang Rong-Yi,Wu Gen-Hua
A monomer 1-acrolyl-2-rhodamine 6G hydrazide (AR6GH) was synthesized by the heterogeneous reaction of acryloyl chloride with rhodamine 6G hydrazide (R6GH) and characterized by 1 H NMR, FTIR and elememtal analyses. Then it was micellar copolymerized with acrylamide (AM), acrylic acid (AA) to obtain a water-soluble fluorescent copolymers (poly(AM-AA-AR6GH)) which were characterized by the method of FTIR and 1 H NMR. The viscosity average molecular weight M
η
– of poly(AM-AA) and poly(AM-AA-AR6GH)s were 1.76 × 10 6 , 8.58 × 10 4 and 7.68 × 10 4 g/mol, respectively. The fluorescent characteristic of the aqueous solutions of copolymers was investigated both in varied pH and in the presence of metal cations. The poly(AM-AA-AR6GH) was found to be a selective chemosensor for Hg 2+ , Cd 2+ , Fe 2+ , Pb 2+ ions. Obvious fluorescence enhancement was due to the photophysical response of the copolymer to the presence of Hg 2+ , Cd 2+ , Fe 2+ , or Pb 2+ ions. In addition, the ability of the copolymer to detect different metal cations (Ag + , Ba 2+ , Co 2+ , Cd 2+ , Cr 3+ , Cu 2+ , Fe 2+ , Fe 3+ , Hg 2+ , K + , Mg 2+ , Mn 2+ , Na + , Ni 2+ , Pb 2+ , Zn 2+ ) in aqueous solution was studied. The results suggest that copolymer may offer potential application for sensors of Hg 2+ , Cd 2+ , Fe 2+ , or Pb 2+ ions in aqueous solution.
研究领域:
材料科学
·
分析化学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 22
·13425-13434
·
IF 3.269
Tingting Gan,Nanjing Zhao,Gaofang Yin,Mengdi Tu,Jianguo Liu,Wenqing Liu
In this study, highly water-soluble Mn-doped ZnS quantum dots (QDs) capped by 3-mercaptopropionic acid (MPA) were successfully synthesized by three different synthetic methods. By comparison, QDs prepared by hydrothermal synthesis method at 100 °C heating for 2 h had the best phosphorescence emission properties. Room-temperature phosphorescence (RTP) could be remarkably and selectively quenched by Pb2+ in a pH 3.8 NaAc–HAc buffer solution. Based on the abovementioned finding, a simple, sensitive, and selective phosphorescence method for rapid detection of Pb2+ was successfully developed using MPA-capped Mn-doped ZnS QDs as a probe. Under the optimized conditions, the RTP intensity ratio of P0/P had a good linear relationship with Pb2+ concentration in the concentration ranges of 4 × 10−8–90 × 10−8 mol L−1 and 90 × 10−8–600 × 10−8 mol L−1 with the correlation coefficients of 0.9967 and 0.9970, which well followed the Stern–Volmer quenching equation, and the Stern–Volmer quenching constants were 8.41 × 105 L mol−1 and 3.452 × 106 L mol−1, respectively. The detection limit was 3.69 × 10−8 mol L−1, and the relative standard deviation for 11 repeated detections of 60 × 10−8 mol L−1 Pb2+ was 2.8%. According to the analysis of the Stern–Volmer quenching equation, UV-Vis absorption spectra, decay curves of phosphorescence emission, and phosphorescence lifetime, the quenching mechanism may imply that energy transfer and charge transfer in the interaction of MPA-capped Mn-doped ZnS QDs at the excited state with Pb2+ made QDs lose excitation energy. This resulted in phosphorescence of QDs causing dynamic quenching. The proposed method was successfully applied to detect Pb2+ in real water samples with satisfactory results, and the recoveries ranged from 93% to 109.3%. The developed method was simple, rapid, and specific and could effectively avoid fluorescence interference of the system, which opened up a promising prospect for the sensitive, convenient, and fast sensing and monitoring of small molecule pollutants in water based on phosphorescence sensors.
研究领域:
分析化学
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yingying Fang,Wenbo Zhou,Yihuan Cheng,Yuge Zhang,Tingting Yu,Shaoxian Song
The high-value utilization of steel pickling waste liquid (SPWL) is an important direction in the resourceful utilization of hazardous waste. In this study, nano-Fe 3 O 4 prepared from SPWL (S-Fe 3 O 4 ) was hydrothermally compounded with MnO 2 as Fe 3 O 4 -MnO 2 (SFM), which were compared with Fe 3 O 4 -MnO 2 (CFM) prepared by chemical reagents. The synthetic materials were evaluated by SEM, VSM, BET, XRD, and zeta potential, the results show that the spherical S-Fe 3 O 4 was encapsulated by spiny spherical shell-like MnO 2 , and the SFM has a high saturation magnetization and specific surface area (159.91 m 2 /g). The adsorption experiments demonstrated that the adsorption effect of SFM on Pb 2+ is highly similar to that of CFM. The maximal adsorption capacity of SFM reached 129.74 mg/g under ideal composite ratio and pH conditions, and the adsorption process was unaffected by competing heavy metal ions coexisting in the environment. Moreover, the high saturation magnetization strength of the SFM makes it simple to separate materials under a magnetic field. The pseudo-second-order kinetics and Langmuir isotherm models provided a good description of the Pb 2+ adsorption on SFM. XPS and FTIR analysis provided evidence that the adsorbent surface has a high concentration of -OH functional groups, and that O atoms serve as Pb 2+ binding sites, suggesting that ion exchange occurs during the SFM adsorption process. In this paper, we developed a cheap SFM with high adsorption performance and provided a novel approach to the high-value application of SPWL.
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 Cleaner Production
·
2023
·
IF 11.1
Yuanjing Ding,Junkai Gao,Zhongzhi Chen,Qian He,Mengsheng Xia,Pengtao Xu,Yan Cao,Yan Chen
Based on the durability of fibroin and the biocompatibility of sericin, researchers are exploring ways to maximize their advantages by combining them in the biomedical field . Fortunately, silk cocoon shell (SC) offers a natural composite material of fibroin and sericin. However, the inherent hydrophobicity of SC, the random arrangement connection of fibers, and the protection provided by the outer sericin limit its application in purifying oil wastewater. In this work, a cost-effective method was developed to improve the hydrophilicity of SC and the mechanical properties of SC by utilizing obsoleted SC as a matrix as well as by dissolving portions of sericin proteins. The polydopamine particle (PDP) was utilized as the intermediate modification layer and a supramolecular gel (SMG) was introduced to the surface of SC, further improving the surface's hydrophilicity of SC. The study indicated that SC@P-SMG has excellent mechanical properties, favorable anti-fouling properties, and superior self-cleaning ability. Furthermore, when the SC@P-SMG was applied in water purification , it could achieve multifunctional applications such as purifying wastewater containing emulsified oil and Pb 2+ ions, methylene blue (MB), and oil-water mixture separation. This work provided innovative ideas to maximize the benefits of combining fibroin and sericin.
研究领域:
材料科学
·
环境科学
·
生物医学
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产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 31
·20062-20073
·
IF 4.036
Lingkai Zhu,Yuyuan Yao,Dingzhou Chen,Ping Lan
Herein, we developed a low-cost fabrication route to prepare chemically grafted activated carbon fibers, which effectively removed Pb2+ from solution. Multiple characteristic results indicated that L-cyst-ACF had abundant nitrogen-containing and sulfur-containing functional groups. Based on the XPS and EDS analyses, the capture of Pb2+ was attributed to the abundant adsorption sites on the fiber surface. According to the analysis of the pseudo-second-order kinetic model and the Langmuir isotherm model, the adsorption process could be interpreted as monolayer adsorption and chemisorption, and the equilibrium adsorption capacity was determined to be 136.80 mg g−1 by fitting the pseudo-second-order kinetic model. The maximum adsorption capacity of L-cyst-ACF for Pb2+ was calculated to be 179.53 mg g−1 using the Langmuir model. In addition, the adsorption reaction was endothermic and spontaneous, as evidenced by the thermodynamic parameters. The outcomes of this study provide a low-cost and feasible strategy for the remediation of Pb2+ pollution in the environment.
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
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Limin Jing,Qijun Ding,Xia Li,Jiang Lou,Zhuqing Liu,Yifei Jiang,Wenjia Han,Zheng Cheng
In this work, fluorescent adsorbents that can efficiently detect and remove Pb 2+ were developed by integrating the designed amino-modified carbon quantum dots and carboxyl-modified collagen. The adsorption properties of the fluorescent adsorbent were further optimized and analyzed using a series of response surface experiments. The maximum adsorption concentration for Pb 2+ was 183 mg.g −1 . The adsorption isotherms fit well with the Langmuir model, and the adsorption kinetics fit with the pseudo-second-order model. The emission intensity of the fluorescent adsorbent gradually decreased with the increase of the concentration of Pb 2+ , and had a good linear correlation. In addition, the mechanism of detection and removal of Pb 2+ by fluorescent adsorbents was further demonstrated. The novel three-dimensional structured fluorescent aerogel can be used as a promising adsorbent with good adsorption concentration and sensing ability for Pb 2+ , which shows great prospects in wastewater.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 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）