INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
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IF 6.953
Zhiying Shao,Jilai Lu,Jian Ding,Fengjiao Fan,Xinyang Sun,Peng Li,Yong Fang,Qiuhui Hu
Chitosan-pectin gel beads (CPBs) were synthesized via a facile and green method and applied to remove heavy metals from aqueous solution. The structural characteristics of CPBs were investigated by SEM and FTIR, the mechanical strength of CPBs was measured by Texture Analyzer and the stability of CPBs was evaluated in acidic solution. To study the adsorption characteristics, the effect of pH, contact time, initial heavy metals concentration, temperature, adsorption mechanism and regeneration were systematically investigated. The adsorption kinetics fitted well pseudo-second-order model, and the adsorption isotherms were well described by Langmuir model. The maximum adsorption capacities of Cu(II), Cd(II), Hg(II) and Pb(II) were 169.4, 177.6, 208.5 and 266.5 mg/g, respectively. The adsorption-desorption experiments revealed that the CPBs exhibited a great reusability. Thus, the synthesized CPBs in this study had the potential to be utilized as an environment-friendly and green adsorbent for the removal of heavy metals.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Bo Huang,Xiangmei Liu,Zhaoyang Li,Yufeng Zheng,Kelvin Wai Kwok Yeung,Zhenduo Cui,Yanqin Liang,Shengli Zhu,Shuilin Wu
Rapid bacteria killing and tissue repair are critical for the fast healing of bacteria-infected wounds, especially under poor sanitation without antibiotics. Herein, we prepared a novel xerogel constructed by thioether as a main chain and embedded by Ag nanoparticles (NPs) and ZnO NPs decorated by N-doped carbon dots (N-CD@ZnO). This hybrid xerogel not only has good mechanical properties without swelling but also has the ability to capture bacteria rapidly by the disulfide group through electrostatic interaction. Under 808 nm near-infrared (NIR) light irradiation for 15 min, this hybrid xerogel killed 99.9% Escherichia coli and 99.85% Staphylococcus aureus by the synergistic action of released Ag + and reactive oxygen species (ROS) produced by N-CD@ZnO using up-conversion technology (N-CD reduces the biotoxicity of ZnO and changes its photocatalytic response region from the 368 nm ultraviolet (UV) region to the 808 nm NIR region). In addition, the biotoxicity of Ag + is limited by the Ag-S covalent bond, which ensures good biocompatibility for the xerogel. Finally, in wound repair experiments in vivo , this xerogel is able to completely repair the wound within 10 days. This work will open up a new avenue for xerogel antibacterial materials.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2021
·Vol. 31
·期 5
·2043-2053
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IF 3.543
Huang Weihong,Liu Yanmeng,Wang Ningwei,Song Guangsan,Yin Xifeng,Zhang Liming,Ni Xiaoni,Xu Wanzhen
A novel electrochemical sensor based on ion imprinted polymers and gold nanoparticles was fabricated for selective and sensitive determination of Cd (II) ion in real samples. Ion imprinted polymers synthesized by conventional precipitation polymerization methods may have the problem in embedding the imprinting sites too deeply. Thereby, the surface imprinting technology by attaching the imprinted material on the surface of the silicon sphere was used to increase the quantity of the imprinting site, and enhances the adsorption performance of the imprinted material. Moreover, thiosemicarbamide functionalized chitosan and methacrylic acid were selected as functional monomers to synthesize the ion imprinted polymers, which enhanced the coordination ability of Cd (II) ions. Also, the electrochemical performance of the electrochemical sensor was well improved by doping gold nanoparticles in the polymer. The morphologies of the obtained imprinted composites were characterized by scanning electron microscopy, transmission electron microscopy. The electrochemical behavior of the imprinted polymers was characterized by CV, DPV and EIS. As a result, the fabricated sensor showed a good selectivity toward target Cd (II) ions. Under optimized experimental conditions, the electrochemical sensor showed a good linear relationship in the range of 10 –9 to 10 –4 mol/L with a low limit detection of 1.43 × 10 –10 mol/L. The improved sensor not only possesses good selectivity and high sensitivity, but also exhibits excellent repeatability and stability. Finally, the proposed electrochemical sensor was successfully applied to the determination of trace Cd (II) ions in real samples.
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RSC Advances
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2021
·Vol. 11
·期 55
·34487-34497
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IF 3.361
Hui Cao,Pu Yang,Tai Ye,Min Yuan,Jinsong Yu,Xiuxiu Wu,Fengqin Yin,Yan Li,Fei Xu
Edible vegetable oils are easily contaminated by heavy metals, resulting in the oxidative degradation of oils and various health effects on humans. Therefore, it is very important to develop a rapid and efficient method to extract trace heavy metals from vegetable oils. In this work, a highly hydrophobic ion-imprinted polymer (IIP) was synthesized on a novel raspberry (RS)-like particle surface. The synthesized IIP@RS was characterized and used in solid-phase extraction (SPE) for the selective and fast adsorption of Cd(II) from vegetable oils. The results showed that IIP was successfully coated onto RS particles with a high specific surface area (458.7 m2 g−1) and uniform porous structure. The contact angle (θ) value (141.8°) of IIP@RS was close to the critical value of super-hydrophobic materials, which is beneficial to their adsorption in hydrophobic vegetable oils. The IIP@RS also exhibited excellent adsorption ability and selectivity to Cd(II) with a maximum adsorption capacity of 36.62 mg g−1, imprinting factor of 4.31 and equilibrium adsorption rate of 30 min. According to isothermal titration calorimetry results, the recognition behavior of IIP@RS for Cd(II) was mainly contributed by Cd(II)-induced cavities during gel formation and coordination between Cd(II) and –SH groups in imprinted cavities. Furthermore, the adsorption process driven by entropy and enthalpy was spontaneous at all temperatures. In real vegetable oil samples, IIP@RS-SPE adsorbed approximately 96.5–115.8% of Cd(II) with a detection limit of 0.62 μg L−1. Therefore, IIP@RS has wide application prospects in enriching and detecting Cd(II) from vegetable oil.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Xiaogong Lv,Chengjun Zhu,Yiming Wang,Lei Wang,Jianming Shi
Kesterite Cu 2 Zn 1- x Cd x Sn(S,Se) 4 (CZCTSSe) alloy thin films were fabricated by the water-based solution approach. The influence of Cd doping on the morphology, phase structure, element valence states, optical, electrical, and device performance were comprehensively examined. Cd was clearly alloyed into the Cu 2 ZnSn(S,Se) 4 (CZTSSe) absorber layer to form the CZCTSSe compound. By controlling the relative Cd content, band gap values ( E g ) of the CZCTSSe thin films were engineered between 1.10 eV and 1.21 eV. In addition, doping with Cd led to the enhancement of grain growth as well as improvement of the conductivity and photoelectric property of the absorber layer. In particular, the CZCTSSe ( x = 0.4) absorber layer exhibited a pure phase, larger grain size, compact and uniform topography, suitable band gap, Cu-poor and (Cd+Zn)-rich composition, higher conductivity and better photoelectric response. Power conversion efficiency (PCE) is improved from 4.37% of the CZCTSSe ( x = 0.0) device to 5.16% of CZCTSSe ( x = 0.4) device, and the increases of short-circuit current ( J sc ) achieved to 8.94 mA/cm 2 . The encouraging results suggest that doping of Cd is an effective way to improve CZTSSe film properties and promote device efficiency.
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JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
·
2021
·
IF 3.981
Yutong Dai,Qingman Li,Shurong Zhang,Shan Shi,Yang Li,Xudong Zhao,Liping Zhou,Xin Wang,Yijian Zhu,Wei Li
Efficient accumulation and on-demand intracellular drug release in the desired site are a crucial issue in developing ideal drug delivery systems (DDSs). Glutathione (GSH)/pH dual-bioresponsive degradable Nanosponges were developed based on β-CD-appended hyper-cross-linked polymer by one-pot polymerization of acryloyl-6- ethylenediamine-6-deoxy-β-Cyclodextrin (β-CD-NH-ACy), acrylic acid (AA) and N , N -bis(acryloyl)- cystamine (BACy) as cross-linker to deliver doxorubcin (DOX) and investigated for GSH/pH triggered DOX release, in which the massive carboxyl and amino groups, and disulfide bonds were used as pH and GSH bioresponsive fragments, respectively. In the proposed DDSs, DOX was readily incorporated into the three dimensional networks of the Nanosponges either as inclusion complexes or as non-inclusion complexes, with a high drug loading capacity of 22.6%. In vitro release studies suggested that the Nanosponges exhibited GSH/pH triggered disintegration and drug release performance, in which DOX release was significantly accelerated in acidic (pH5.0) and cytosolic reduction (10 mM GSH) conditions, with ~77.0% of DOX release. The morphology changes of DOX@Nanosponges in releasing media (pH5.0, 10 mM GSH) were further studied by TEM . Confocal microscopy observation demonstrated that DOX was delivered and released into cytoplasm and nucleus of A549 cells in 7 h incubation with DOX@Nanosponges. MTT assays manifested that the Nanosponges exhibited low cytotoxicity up to a concentration of 1000 μg/mL and DOX@Nanosponges had high anti-tumor activity. These findings demonstrated that the dual-bioresponsive Nanosponges may function as a promising platform for targeted delivery and intracellular drug controlled release in tumor therapy.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Jia Wen,Xiaohong Hu
Recently, the developments of MOFs and their applications on heavy metal removal have attracted much attention. In this paper, we focused on the influence of co-existing ions on the adsorbability of epigallocatechin gallate (EGCG) modified ZIF-8 in a multi-metal system (Cd(II), Cu(II), Ni(II), and Cr(VI)). It was found that the adsorption of Cd(II), Cu(II), Ni(II), and Cr(VI) on the ZIF-8-EGCG fitted well with the pseudo second-order kinetic model and Langmuir isotherm. The adsorption selectivity of ZIF-8-EGCG in the mixed metal solution followed the order of Cu(II) ≫ Cr(VI) > Cd(II) > Ni(II). Besides, Cu(II) was the most attractive substance with a maximum capacity of 232.97 mg·g −1 . Copper also disturbed the adsorption of Cd(II) and Ni(II) and contributed the most to the Cr(VI) removal. The natural anions (e.g., Cl − , NO 3 – , AsO 2 − , SO 4 2− ) significantly impeded Cr(VI) adsorption, while low concentrations of natural cations (e.g., K + , Na + , Ca 2+ , and Mg 2+ ) facilitated the adsorption of Cd(II), Cu(II) and Ni(II).
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JOURNAL OF MOLECULAR LIQUIDS
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2020
·
IF 5.065
Xiang Meng,Rui Hu
Nitrogen/phosphorus enriched biochars with enhanced porosity were prepared through a one-step pyrolysis of bamboo sawdust activated by guanidine phosphate (GP). The thermal decomposition of GP released alkaline gas and hydrogen proton to create more micropores in biochar matrix which were extended to be mesopores further. Nitrogenous/phosphorous moieties of GP were introduced into biochars efficiently via cross-linking with the carbon skeleton. GP-activated biochar pyrolyzed at 450 °C exhibited enriched surface functional groups (11.3 at.% for N, 4.1 at.% for P), resulting in high sorption capacities for aquatic Pb(II) (166.2 mg/g), Cu(II) (81.7 mg/g), and Cd(II) (60.3 mg/g). Pb(II) was passivated fast with the formation of minerals including Pb 5 (PO 4 ) 3 OH and Pb 5 (PO 4 ) 3 Cl. Cu(II) was strongly coordinated with the N-containing species especially pyridinic N. Cd(II) was also captured efficiently due to the chemical complexation, cation exchange and cation-π bonds. GP-activated biochars could be well-recycling used to capture these heavy metals. Regarding these, the activation of biomass residuals could be an efficient approach to functionalize the surface of biochars with enhanced porosity, which is great benefiting for the immobilization of heavy metals from contaminated water.
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Biomass Conversion and Biorefinery
·
2021
·Vol. 13
·期 9
·8277-8286
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IF 4.987
Wang Dongmei,Luo Weiye,Zhu Jingyi,Wang Tengfei,Gong Zhengjun,Fan Meikun
In this study, a novel alkali-modified biochar prepared from ginkgo leaves was produced by simply one-step pyrolysis and was investigated as an adsorbent for the removal of Pb, Cd, and Cu from aqueous solutions. After modified by alkali, ginkgo leaves biochar exhibited abundant surface functional groups and large porosity, resulting in high adsorption capacities for Pb (589.32 mg·g −1 ), Cd (563.55 mg·g −1 ), and Cu (81.7 mg·g −1 ). Simulation results showed that pseudo-second-order model and Langmuir model were better fitted to analyze the heavy metals adsorption process by alkali-BC, indicating that multilayer adsorption was the main reason for heavy metals removal. Besides, effect of pH and coexisting cations on adsorption of Pb, Cd, and Cu by alkali-BC was studied. Moreover, competitive adsorption of the three heavy metal ions by alkali-BC in binary system was also explored. Finally, the removal mechanism of Pb, Cd, and Cu in aqueous solution was analyzed and summarized. Due to the good performance in a wider pH range and high absorption capacity, alkali-BC would be an efficient adsorbent for heavy metals in real environmental samples.
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JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Jiahao Li,Shiyao Li,Jiaao Chen,Rong Cheng,Fangyuan Chen,Xuli Li,Xuemei Zhang,Tianyu Zeng,Haobo Hou
Many Industrial effluents contain high concentrations of Cd(II) and Pb(II), which are serious problems for causing threat to human health. Adsorption has drawn considerable attention owing to its high efficiency and easy operation. In this paper, nanoscale nitrogen-doped aerogel microspheres (NCA) was synthesised through polymerization of phenolic resin and melamine in an emulsion suspension system. Factors influencing the adsorption properties of NCA and carbon aerogels microspheres (CA) toward Cd(II) and Pb(II) ions were studied, namely, pH, adsorbent content, initial Cd(II) and Pb(II) concentrations, and contact time. Furthermore, three models isotherm including Langmuir, Freundlich, and Sipss and three kinetic models were used in interpreting the adsorption process. NCA exhibited an excellent adsorption property and maximum removal capacity of 935.56 mg·g −1 for Pb(II) and 282.07 mg·g −1 for Cd(II). Results from XPS analysis implied that the amount of Pb absorbed by NCA was higher than that of CA mainly because of the complexing effect of nitrogen-containing functional groups on Pb(II). Furthermore, density functional theory (DFT) calculations confirm that N doping is beneficial to Pb(II) adsorption. These results suggested that NCA can be used as an adsorbent for the removal of Cd(II) and Pb(II) from industrial effluents.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Ruomeng Zhu,Pengling Zhang,Xinxin Zhang,Mei Yang,Ruiqi Zhao,Wei Liu,Zhongyue Li
A key matter in heavy metal removal technology is to develop the adsorbents with efficient adsorption sites. In this study, an oxygen-rich covalent organic framework (JUC-505) was functionalized by carboxyl (−COOH) groups to form synergetic effects aiming for the removal of Cd(II) and Pb(II) ions. JUC-505-COOH shows a high Cd(II) uptake of 504 mg⋅g −1 surpassing most of the reported porous adsorbents. Meanwhile, the kinetics study shows a rapid adsorption process at a high initial concentration (100 mg⋅L −1 ), and the equilibrium can be reached within 5 min. We investigated the adsorption mechanism in-depth by density functional theory calculations, proving the synergistic effects of surface complexation and hydrogen-bond, which are from the post-modified −COOH groups and the in-situ oxygen atoms of JUC-505, respectively. Moreover, under the interference of common ions in natural water, the removal efficiency of Cd(II) is almost insusceptible, which sheds lights on the potential for the application in the natural water purification . In addition, the Pb(II) uptake (559 mg⋅g −1 ) and the adsorption kinetics also surpass most of the reported porous adsorbents.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 22
·22244-22258
·
IF 2.8
Yan Xuechao,Zhang Xiaoping,Li Qian
In this paper, an effective chitosan/beta-cyclodextrin/nanometer zinc oxide (CS/β-CD/Nano-ZnO) composite porous membrane was synthesized by sol-gel and polymer-assisted inverting method. Preparation conditions of CS/β-CD/Nano-ZnO were investigated by single-factor and Box-Behnken response surface methodology optimizing triethoxyvinylsilane (JH-V151), beta-cyclodextrin (β-CD), and nanometer zinc oxide (Nano-ZnO), and applied to study the adsorption characteristics of Cong red (CR) from aqueous solution using batch experiments. The optimum preparation conditions were determined that the volume fraction of JH-V151 alcohol solution was 11%, the ratio of β-CD to CS was 5.35, and the ratio of Nano-ZnO’s mass to solution’s volume was 0.36%. Different characterization methods including field-emission scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, UV-visible spectroscopy, and Universal Materials Tester were used to prove the appearance, crystallinity, functional groups, swelling degree, transmittance, and tensile property of CS/β-CD/Nano-ZnO. The optimized batch experimental parameters were 50 mg L −1 , 4 h, 7.0, 0.5 g L −1 , and 55.0 °C as initial concentration, contact time, pH, adsorbent dose, and temperature, respectively. The maximum adsorption capacity on CR reached 96.33 mg g −1 , which is 4.34 times with respect to CS. The batch experimental data were best described by a pseudo-second-order kinetics model and Langmuir isotherm model ( R 2 = 0.9965, theoretical saturated adsorption capacity 147.28 mg g −1 ). The values ∆G were − 2.09, − 4.73, and − 7.37 kJ mol −1 at 298, 308, and 318 K temperatures, respectively. The ∆H value was 76.68 kJ mol −1 , indicating the endothermic and spontaneous adsorption in nature. The ∆S value was 0.26 kJ mol −1 K −1 , a signal of entropy increase during adsorption. The adsorption capacity decreased only by 5.8% after six recycling runs, which indicated the reusability of CS/β-CD/Nano-ZnO. Therefore, the CS/β-CD/Nano-ZnO composite porous membrane is a promising membrane material for the efficient removal of CR from any water at large and economic scales at moderate concentration.
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