JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2014
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IF 3.107
Xiao-kun OuYang,Ru-Na Jin,Le-Ping Yang,Zheng-Shun Wen,Li-Ye Yang,Yang-Guang Wang,Chong-Yu Wang
A novel porous succinylated bioadsorbent was prepared by the partial enzymatic hydrolysis of bamboo (Phyllostachys heterocycla) and its subsequent modification with succinic anhydride. Pb(II) removal from solutions that also contained sodium chloride and an amino acid was investigated using the bioadsorbent. Enzymatic hydrolysis increased the number of accessible hydroxyl groups and surface area of the raw bamboo, and created many pores within the material. The porous succinylated bioadsorbent exhibited high efficiency for Pb(II) binding. The sodium chloride content significantly decreased the Pb(II) adsorption capacity, whereas a minor effect was observed in the presence of arginine. The experimental data could be accurately described by a pseudo-second-order kinetics model, and the adsorption proceeded via an ion exchange mechanism. Even in a solution containing sodium chloride and arginine, the maximum adsorption capacity of Pb(II) by the porous succinylated bioadsorbent was 99.5 mg/g at 303 K.
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POLYMER
·
2017
·
IF 3.684
Yanli Ma,Ling Lv,Yuanru Guo,Yujie Fu,Qian Shao,Tingting Wu,Sijie Guo,Kai Sun,Xingkui Guo,Evan K. Wujcik,Zhanhu Guo
Lignin grafted N, N′-methylene-bisacrylamide (LM) was copolymerized with acrylic acid (AA) to fabricate lignin based poly (acrylic acid) (LBPAA) nanocomposites, and organo-montmorillonite (OrgMMT) was uniformly dispersed in LBPAA by ultrasonic method. The water absorbency in KCl solution was 302.9 g/g for LBPAA/OrgMMT (3 wt% OrgMMT, 43.65 wt% LM, and 53.35 wt% poly(acrylic acid) (PAA)), higher than PAA/OrgMMT (104.5736 g/g), and PAA (131.8 g/g). The Pb 2+ adsorption for LBPAA/OrgMMT was demonstrated to be pH-dependent and followed Freundlich multilayer adsorption , with the removal following a pseudo-second-order kinetic model . The Pb 2+ absorption capacity of LBPAA (PAA 48.50/48.50 LM)/OrgMMT (3 wt%) was 1.0803 mmol·g −1 , the highest among the composites. When the mole ratio of Na + and Pb 2+ was less than 0.21, the Pb 2+ adsorption capacity of LBPAA/OrgMMT decreased slightly. The negative ΔG 0 indicated that the Pb 2+ adsorption process for composite hydrogel and PAA was spontaneous. XPS analysis data indicated that Pb 2+ ions formed Pb-O bonds by hydroxyl groups and carboxyl groups for efficient lead ion adsorption. This study demonstrates that LBPAA/OrgMMT can be used as a water retention agent with salt tolerance and as an adsorbent for removing Pb 2+ ions from industrial waste water .
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CHEMICAL ENGINEERING JOURNAL
·
2016
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IF 5.31
Wei Wang,Yilong Hua,Shaolin Li,Weile Yan,Wei-xian Zhang
A common concern in the approval of nanotechnology for water treatment is whether there are advantages of these nanomaterials over conventional water treatment reagents. In this work, nanoscale zero-valent iron (nZVI) is compared with lime (Ca(OH) 2 ), the most widely used heavy metal precipitant, for Pb(II) and Zn(II) removal, in laboratory and field experiments. Water chemistry, treatment efficiencies and reaction products of the two reagents are compared and the study shows that the moderate solution pH of nZVI and its seed effect play vital roles in producing high-quality effluents. The results are then verified in a field continuous-flow experiment using tons of lime and kilos of nZVI. The results show that sub-ppm levels (∼0.1 mg/L) of Pb(II) and Zn(II) could not be achieved via lime precipitation alone, due to the solubility limits of metal hydroxides and their re-dissolution caused by the strong alkalinity of lime. In comparison, stable and lower levels of Pb(II) and Zn(II) were easily attained using nZVI, due to its multifunctional properties and good tolerance for influent fluctuation enabled by its inherent pH-stabilizing nature. SEM characterizations, particle size analyses and quiescent settling experiments show the ability of nZVI to generate large and consolidated solids that are amenable to gravitational separation. The study shows several key advantages of nZVI over lime technology in Pb(II) and Zn(II) removal. As lime is widely used for heavy metal removal, this work provides an effective advanced treatment process to supplement lime-based treatment methods.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2017
·Vol. 24
·期 23
·19194-19200
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IF 2.741
Chen Tingru,Liu Xiaoyan,Zhang Xinying,Hu Xiaoxin,Cao Liya
To understand the accumulation and uptake of polycyclic aromatic hydrocarbons (PAHs) and heavy metals by plants is an important part of the assessment of phytoremediation for PAHs and heavy metals co-contaminated soil. This study was an investigation of the accumulation and uptake of pyrene and lead (Pb) by Scirpus triqueter under the condition of alkyl polyglucoside (APG) and nitrilotriacetic acid (NTA) combined application. The results indicated that the accumulation of Pb by S. triqueter was significantly improved by NTA and APG addition into the soil. The pyrene accumulation in plant was also increased after application of APG when compared to the control treatment. However, the pyrene accumulation was decreased when APG was applied together with NTA. SEM and TEM images of root surface suggested that more Pb in the soil transferred to the plant by combined application of APG and NTA. More importantly, TEM images of xylem cells of S.triqueter root showed that permeability of cell membrane was improved by application of APG.
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INORGANIC CHEMISTRY
·
2017
·
IF 4.857
Yi-Gang Chen,Nan Yang,Xing-Xing Jiang,Yao Guo,Xian-Ming Zhang
The first lead tellurate–nitrate nonlinear-optical (NLO) crystal, Pb9Te2O13(OH)(NO3)3, featuring a 3D anionic diamondlike toplogical structural motif formulated as [Pb9O13]8– constructed by unique nonanuclear basket-shaped Pb@Pb8O14 clusters has been hydrothermally achieved, in which the Pb@Pb8O14 cluster shows a core–shell structure with one PbO10 polyhedron enclosed by eight PbOx (x = 3 and 4) polyhedera via edge and face sharing. The hexavalent Te in TeO5(OH) octahedra is linked to a [Pb9O13]8– cluster to form a rare [Pb9Te2O13(OH)]3+ cationic framework. The compound demonstrates a powder second-harmonic-generation (SHG) response of about 1.2 times that of KH2PO4 (KDP) as well as a wide transparency range. Calculations on the local dipole moment and SHG coefficient reveal that the net polarization is zero because of a Kleinman-forbidden point group. Further analysis shows that the SHG response results from structure-induced variations by thermal vibrations of the lattice rather than the intrinsic dipole moment, which offers another insight on the design of new NLO materials.
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JOURNAL OF HAZARDOUS MATERIALS
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2017
·
IF 6.065
Qinghua Xu,Yulu Wang,Liqiang Jin,Yu Wang,Menghua Qin
A novel nanocomposite based on black wattle (BW) tannin and nanocellulose was prepared and applied in heavy metal ions adsorptive removal from aqueous solutions. Firstly, nanocrystalline cellulose was oxidized by sodium periodate to get dialdehyde nanocellulose (DANC). BW tannin was then covalently immobilized onto DANC, which was used as both the matrix and crosslinker, to obtain tannin-nanocellulose (TNCC) composite. The resulting nanocomposite was characterized using FTIR, AFM, and TG. The successful immobilization was confirmed by the chromogenic reaction between FeCl 3 and TNCC and FT-IR analysis. AFM images revealed that TNCC was ellipsoidal particles with lengths ranging from 100–400 nm. Zeta potential measurement showed that TNCC was negative charged at a pH range from 1–12. Compared to the original tannin, the thermal stability of TNCC was slightly increased by the addition of nanocellulose. TNCC demonstrated the maximum adsorption efficiency at pH 2 for Cr(VI) and pH 6 for Cu(II) and Pb(II), respectively. The adsorption for these three metal ions followed pseudo second-order kinetics, indicating the chemisorption nature. The adsorption isotherms all fitted well with the Sips model, and the calculated maximum adsorption capacities were 51.846 mg g −1 , 53.371 mg g −1 and 104.592 mg g −1 for Cu(II), Pb(II) and Cr (VI), respectively.
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Bulletin of Engineering Geology and the Environment
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2024
·Vol. 83
·期 9
·1-16
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IF 3.7
Gao Yuhao,Li Jianzhong,Yang Zhongping,Li Xuyong,Wang Zhitao
The sanitary landfill method remains the primary disposal of municipal waste in developing countries. Effective landfill barriers in intercepting pollutants are warranted to avoid soil and groundwater contamination by leachate leakage from those landfills that threaten human health. This work focuses on enhancing the capability of reticulated red clay barriers to intercept Pb(II) by incorporating activated charcoal and bentonite. The impacts of additives on the hydraulic behavior and Pb(II) blocking efficacy of composite reticulated red clay were explored through hydraulic conductivity and leachate concentration tests, respectively. The microstructural evolution of barrier materials was revealed through scanning electron microscope (SEM) and mercury intrusion porosimetry (MIP) tests. Results suggest that the formulated activated charcoal-bentonite-reticulated red clay composite barrier exhibited significantly better performance than those with the additives individually. The permeability coefficient and Pb(II) leachate concentration of the activated charcoal-bentonite-reticulated red clay barrier with 5% activated charcoal, 16% bentonite, and 79% reticulated red clay were found to be 13.20% and 23.97% of pure reticulated red clay, respectively. The pore size distribution (PSD) curve indicates that the activated charcoal -bentonite-reticulated red clay barrier contains only nanoscale pores. In addition, the activated charcoal and bentonite in the composite barrier form a tortuous network structure that binds the clay aggregates together. This results in more intricate flow paths, enhancing adsorption and ion exchange effects, ultimately reducing hydraulic conductivity and improving the barrier’s ability to intercept contaminants.
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JOURNAL OF MOLECULAR LIQUIDS
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2024
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IF 5.3
Yong Zeng,Yingdi Dong,Xiongxing Zhang,Zhongbao Hua,Xiqing Wu,Wei Sun,Haisheng Han,Li Wang,Honghu Tang
In the flotation separation of Mo-Pb bulk concentrate and the purification process of Pb-containing molybdenite concentrate, depressants are typically added to depress galena or molybdenite, aiming to obtain high-quality flotation products. Previous studies have focused on the depression of galena. In this study, gallic acid (GA) was utilized as a molybdenite depressant during Mo-Pb flotation separation. Single mineral flotation experiments showed that pH notably influenced galena and molybdenite flotation with GA, particularly at pH 10, displaying the most substantial recovery difference. Mixed mineral flotation experiments revealed GA’s selective depression on molybdenite. At the optimal dosage of GA, the Mo recovery was reduced by 76.62 percentage points, while the Pb recovery remained unaffected. The depression and separation mechanisms of GA were investigated using contact angle, infrared spectroscopy, Zeta potential, inductively coupled plasma optical emission spectrometer (ICP-OES), X-ray photoelectron spectroscopy (XPS) analysis, first-principles calculations analysis, and interface interaction free energy calculations. The results indicate that GA treatment significantly reduces the hydrophobicity of molybdenite surfaces; however, it slightly enhances the hydrophobicity of galena surfaces. At pH 10, the primary species in GA solution is HGA 3- . It adsorbs on PbO species of the galena surface as Pb-GA complexes and tends to detach from the surface at high adsorption capacity, resulting in galena not being depressed by GA. Differently, GA adsorbs on the molybdenite surface through hydrophobic attraction force, rendering it hydrophilic. Additionally, after treatment with potassium butyl xanthate (PBX), the hydrophobicity of GA-treated galena is significantly enhanced, while the hydrophobicity of GA-treated molybdenite is not restored. This is because PBX can adsorb stably on GA-treated galena, but its adsorption on GA-treated molybdenite is hindered by the pre-adsorbed GA.
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Chemical Science
·
2024
·
IF 7.6
Wei-Xing Chen,Zi-Sheng Li,Harry W. T. Morgan,Cong-Cong Shu,Zhong-Ming Sun,John E. McGrady
We report here the synthesis and characterization of two endohedral Zintl-ion clusters, [Fe4Sn18]4− and [Fe4Pb18]4−, which contain rhombic Fe4 cores. The Fe–Fe bond lengths are all below 2.5 Å, distinctly shorter than in the corresponding Cu clusters, indicating the presence of Fe–Fe bonding. Subtle differences in the structure of the Fe4 core between the two clusters suggest that the change in tetrel element causes a change in electronic ground state, with a very short Fe–Fe bond length of 2.328 Å present across the diagonal of the rhombus in the lead case.
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CHEMICAL PHYSICS LETTERS
·
2024
·
IF 2.8
Yao Feng,Wenwen Liu,Chaoqun Mu,Lvling Zhong,Zhixian He,Liang Zhang,Juanqin Xue
Several issues plague polymer and calcium carbonate (CaCO 3 ) composites, including the tendency of CaCO 3 particles to aggregate and detach easily, as well as a limited number of adsorption sites. To address the aforementioned issues, a novel large-particle hollow shell-structured PVA-encapsulated nano-CaCO 3 aerogel (PCC) was prepared. The characterization results indicate that the PCC (∼3 mm) possess a three-dimensional network structure with a stereoscopic arrangement of big and small pores. The adsorption of Pb(II) adheres to pseudo-first-order adsorption kinetics and the adsorption equilibrium follows the Langmuir model with a maximum adsorption capacity of 482.85 mg/g at 313 K for Pb(II). The PCC exhibits good selectivity and stability of adsorption towards Pb(II), retaining 92.6 % of its initial adsorption capacity after seven cycles. The large-particle morphology of this material demonstrates significant potential for effectively removing Pb(II) in wastewater treatment applications.
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DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Yu Li,Yuxin Xu,Jiayu Zhu,Xianghui Meng,Shuang Ai,Meiling Zhang,Fan Yang,Huabing Yin,Kui Cheng
Heavy metal contamination, particularly from Pb(II), poses severe environmental and health risks due to its toxicity and persistence in ecosystems. This study presents an innovative and sustainable adsorbent composed of nitrogen doped carbon quantum dots (NCDs), derived from sodium alginate and immobilized on a sodium alginate hydrogel (HL-NCDs), for the efficient extraction of Pb(II) from water. The experimental results indicate that Pb N and Pb C interactions, particularly involving the N H moieties within the carbon quantum dots, are the predominant mechanisms facilitating Pb(II) removal, as confirmed by density functional theory (DFT) calculations. These interactions are substantiated by thermodynamic analyses and charge distribution studies, which highlight the enhanced affinity of HL-NCDs towards Pb(II) ions. The novel HL-NCDs composite material not only demonstrates excellent Pb(II) adsorption efficiency but also suggests broad applicability in water treatment technologies, marking a significant advancement in the use of biomass-derived materials for environmental remediation.
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ADVANCED MATERIALS
·
2024
·
IF 27.4
Liguo Jin,Hanpeng Liu,Chaofeng Wang,Congyang Mao,Shuilin Wu,Yu Zhang,Zhaoyang Li,Shengli Zhu,Hui Jiang,Zhenduo Cui,Yufeng Zheng,Xiangmei Liu
Due to their poor light penetration, photothermal therapy and photodynamic therapy are ineffective in treating deep tissue infections, such as osteomyelitis caused by Staphylococcus aureus ( S. aureus ). Here, a microwave (MW)-responsive magnetic targeting composite system consisting of ferric oxide (Fe 3 O 4 )/Prussian blue (PB) nanoparticles, gentamicin (Gent), and biodegradable poly(lactic-co-glycolic acid) (PLGA) is reported. The PLGA/Fe 3 O 4 /PB/Gent complex is used in combination with MW thermal therapy (MTT), MW dynamic therapy (MDT), and chemotherapy (CT) to treat acute osteomyelitis infected with S. aureus -infected. The powerful antibacterial effect of the PLGA/Fe 3 O 4 /PB/Gent is determined by the synergistic effects of heat and reactive oxygen species (ROS) generation by the Fe 3 O 4 /PB nanoparticles under MW irradiation and the effective release of Gent at the infection site via magnetic targeting. The antibacterial mechanism of the PLGA/Fe 3 O 4 /PB/Gent under MW irradiation is analyzed using bacterial transcriptome RNA sequencing. The MW heat and ROS reduce the activity of the protein transporters on the bacterial membrane, along with the transport of various ions and the acceleration of phosphate metabolism, which can lead to increased permeability of the bacterial membrane, damage the ribosome and DNA, and accompany the internal protein efflux of the bacteria, thus effectively killing the bacteria.
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