JOURNAL OF MOLECULAR LIQUIDS
·
2015
·
IF 2.515
Xiaoli Sun,Xiguang Liu,Bujun Yang,Lianchi Xu,Shaoming Yu
Chrysotile nanotubes (ChNTs) synthesized under hydrothermal conditions were functionalized by surface grafting in toluene with 3-mercaptopropyltrimethoxysilane (MPTMS). The mercapto functionalized ChNTs (ChNTs-SH) were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and N 2 adsorption–desorption. The adsorption of Pb(II) and Cd(II) on ChNTs-SH was investigated systematically by evaluating the effects of contact time, adsorbent dosage, initial pH and temperature. Initial pH could play an important role on the adsorption of Pb(II) and Cd(II) onto ChNTs-SH. The adsorption kinetics and isotherms of Pb(II) and Cd(II) on ChNTs-SH indicated that the kinetic data of adsorption reactions were well described by the pseudo-second-order model (R 2 = 0.9960 and 0.9970, respectively) and the adsorption isotherms were fitted well by the Langmuir model ( q m Pb(II) = 83.96 mg/g, q m Cd(II) = 39.23 mg/g at 298 ± 1 K). The thermodynamic parameters (Δ G , Δ H and Δ S ) indicated that the adsorption process of Pb(II) and Cd(II) on ChNTs-SH was spontaneous and endothermic. ChNTs-SH could obviously improve the adsorption capacity for Pb(II) by 225.4% and for Cd(II) by 123.5% as compared with ChNTs. Overall, ChNTs-SH could provide a potential remedy for heavy metal contamination in wastewater.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 10
·26191-26207
·
IF 5.19
Lu Yanrong,Lin Hai,Zhang Ye,Dong Yingbo
In this study, sodium lignosulfonate modified illite (LS-ILT), an environmentally friendly adsorbent, was prepared by hydrothermal modification. An extensive study of Pb(II) and Cd(II) adsorption behavior and the mechanisms were conducted by evaluating the effects of initial pH value, sorbents dosage, and initial concentration of Pb(II) and Cd(II). Results showed that the adsorption characteristics of Pb(II) and Cd(II) by LS-ILT were well described by quasi-second-order kinetics and the Freundlich model, and the maximum adsorption capacity of Pb(II) and Cd(II) was 42.3 mg/g and 17.0 mg/g, respectively. The optimal application conditions for adsorption equilibrium were the dosage of 4 g/L and reaction pH = 5.5–5.8. The adsorption stability of Pb(II) by LS-ILT was better than that of Cd(II), and most of the existence of coexisting cations had no obvious inhibitory effect on the removal of Pb(II) and Cd(II). Furthermore, the dynamic adsorption results showed that LS-ILT can meet the ultra-low emission standard, and the adsorption capacity could maintain over 50% after four cycles, further providing certain guiding significance for the treatment of wastewater with ultra-low concentrations of heavy metals Pb(II) and Cd(II).
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Minerals
·
2023
·Vol. 13
·期 10
·1337
·
IF 2.5
Jiaqian Zhang,Zhe Wang,Ying Luo,Zhenlong Zhang,Xiyang Feng,Qiuping Zeng,Duan Tian,Chao Li,Yongde Zhang,Shu Chen
To enhance the sorption efficacy of attapulgite for heavy metals, mercapto-functionalized attapulgite (ATP-SH) was synthesized with mercaptan functional groups. When the mass-to-volume ratio of calcined attapulgite (ATP-C) to 3-Mercapropyltrimethoxysilane (MPTMS) was 1 g:0.5 mL (ATP-SH-0.5) and the pH was set to 8, a strong adsorption capacity for Cd (II) and Pb (II) was demonstrated. This indicates excellent adsorption performance for these heavy metals. ATP-SH-0.5 exhibited a maximum adsorption capacity of 43.81 mg/g and 274.83 mg/g for Cd (II) and Pb (II), respectively, in a single ion system. In a binary ion system, the maximum adsorption capacity was 31.86 mg/L and 254.45 mg/L for Cd (II) and Pb (II), respectively. Various characterizations and experiments showed that the adsorption of Cd (II) and Pb (II) onto ATP-SH-0.5 involves ion exchange reactions involving hydroxyl and thiol functional group complexation reactions. This adsorption process follows a single-molecule layer adsorption mechanism. XPS results indicate that hydroxyl and grafted thiol functional groups on the surface of mercapto-functionalized attapulgite participated in surface complexation reactions with Cd (II) and Pb (II), resulting in the formation of Cd-S and Pb-S species. Overall, this study provides a promising mercapto-functionalized modification material for the remediation of polluted water and soil.Keywords:attapulgite;thiol functional group;heavy metal;adsorption mechanism;XPS qualitative analyses
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Inorganic and Nano-Metal Chemistry
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2021
·
IF 1.716
Weiqiang Xu,KaiKai Hu,Shouwen Jin,Yuting Zhang,Daqi Wang
Transition metal carboxylates with O- and N-donor ligands are interesting for their structural features. Seven novel isonicotinamide(inic)-based metal complexes of [Cd(inic)2(L1)2(H2O)2] · 2H2O (1) (L1 = 2-chloronicotinate), [Cd(inic)2(L2)2(H2O)2] (2) (L2 = 2,4-dichlorobenzoate), [Cu(inic)2(L3)2] (3) (L3 = 4-chlorophenoxyacetate), [Cu3(inic)6(L4)2(HL4)2(H2O)2] · 2H2O (4) (L4 = azelate), [Zn(inic)2(L1)2(H2O)2] · (inic) · H2O (5), [Zn(inic)(L5)(H2O)4] (6) (L5 = 3-nitrophthalate) and [Zn2(inic)2(L6)2] · 5H2O (7) (L6 = 1,4-cyclohexanedicarboxylate) have been obtained by the introduction of the carboxylates by the common solution method and are structurally featured by different techniques of EA, IR spectra, TG and SCXRD analysis. The X-ray studies told that these complexes display mononuclear to trinuclear structures with octahedral/square-pyramidal geometry around the Zn2+, trigonal bipyramidal/octahedral at the Cu2+ and octahedral for the Cd2+. The inic in 1–7 are coordinated only in monodentate fashion with its ring N, while 5 has the lattice inic. The carboxylates coordinated to the metal in monodentate, chelating bidentate and bridging bidentate fashions. The pair of complementary N-H···O H-bonds from the CONH2 of the inic were found in all compounds except 7. Except 1 and 2, all other compounds bear the CH-O contacts from the pyridine CH of the inic. The intricate intra- and intermolecular classical H-bonds, CH-N, CH-O, CH-Cl, CH2-O, O-N, O-O, Cl-O, Cl-Cl, CH-π, CH2-π, C-π, N-π, Cl-π and π-π associations are elucidated by the X-ray crystallographic studies, which push the discrete complexes into high-dimensional ordered supramolecular structures.
研究领域:
化学
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材料科学
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晶体学
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DOI
高影响因子
BMC Chemistry
·
2023
·Vol. 17
·期 1
·1-14
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IF 4.6
Li Xingjie,Xiao Qiusheng,Shao Qin,Li Xiaopeng,Kong Jiejie,Liu Liyan,Zhao Zhigang,Li Rungen
Biosorbents have been extensively studied for heavy metal adsorption due to their advantages of low cost and high efficiency. In the study, the living and non-living biomass of Cupriavidus necator GX_5 previously isolated were evaluated for their adsorption capacity and/or removal efficiency for Cd (II) through batch experiments, SEM and FT-IR investigations. The maximum removal efficiency rates for the live and dead biomass were 60.51% and 78.53%, respectively, at an optimum pH of 6, a dosage of 1 g/L and an initial Cd (II) concentration of 5 mg/L. The pseudo-second-order kinetic model was more suitable for fitting the experimental data, indicating that the rate-limiting step might be chemisorption. The Freundlich isotherm model fit better than the Langmuir isotherm model, implying that the adsorption process of both biosorbents was heterogeneous. FT-IR observation reflected that various functional groups were involved in Cd (II) adsorption: –OH, –NH, C=O, C–O and C–C groups for the living biomass and –OH, –NH, C–H, C = O, C–N and N–H groups for the dead biomass. Our results imply that non-living biosorbents have a higher capacity and stronger strength for absorbing Cd (II) than living biomass. Therefore, we suggest that dead GX_5 is a promising adsorbent and can be used in Cd (II)-contaminated environments.
研究领域:
环境科学
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生物技术
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微生物学
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化学工程
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水处理
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DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2026
·Vol. 237
·期 17
·1000
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IF 3.5
Yan Shiying,Zhang Jian,Liu Yimeng,Chen Yiping,Jiang Tianlan,Gao Yu,Zhang Jie,Gao Jingqi,Li Fosheng,Zhao Jian,Feng Su
This study presents a composite biosorbent, Nano-Fe—SA—XB, synthesized by immobilizing a consortium of Shewanella putrefaciens and Serratia sp. B16 (XB) within a sodium alginate (SA) matrix reinforced with Nano-Fe 3 O 4 (Nano-Fe). A preliminary orthogonal formulation screening identified 4% Nano-Fe, 4% SA, 30 g/L XB biomass, and 4 h crosslinking as the selected preparation condition. At pH 7, using a wet dosage of 0.6 g (equivalent to a calculated dry mass of ~ 0.03 g), Nano-Fe—SA—XB achieved an 80.51% removal efficiency at a 20 mg/L initial Cd(II) concentration. Normalized to dry weight, the experimental maximum adsorption capacity was 72.5 mg/g at 150 mg/L, while the Langmuir-estimated capacity reached 87.8 mg/g. Kinetic and isotherm fitting suggested that Cd(II) uptake was consistent with pseudo-second-order kinetics and Sips/Langmuir-type adsorption behavior. SEM–EDS and FTIR analyses suggested that Cd(II) removal was associated with surface complexation and ion-exchange interactions involving hydroxyl, amide/carboxyl, phosphate, and calcium-containing sites. XRD showed no detectable new crystalline Cd-containing precipitates after adsorption. The material also showed NaCl-regeneration potential and 30-day Cd(II) retention/release stability. Overall, Nano-Fe—SA—XB shows potential as a reusable biosorbent for Cd(II)-contaminated water, while further mechanical, thermodynamic, surface-charge, pore-structure, magnetic, and chemical-state characterization is still needed. Graphical
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高影响因子
JOURNAL OF ANALYTICAL CHEMISTRY
·
2017
·Vol. 72
·期 6
·682-688
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IF 0.723
Pan Yan,Dong Yong-Ping,Chu Xiang-Feng,Ding Hou-Cheng
Polypyrrole-sepiolite ( PPy/SPL ) nanofibers were prepared by in situ chemical oxidation polymerization in the presence of sepiolite. A PPy/SPL composite modified glassy carbon electrode ( PPy/SPL/GCE ) was prepared and characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and electrochemical methods. Differential pulse anodic stripping voltammetry for the simultaneous determination of trace Pb(II) and Cd(II) was carried out at the PPy/SPL/GCE. Operational parameters such as the deposition potential and time, the amount of modified suspension, and the pH values were optimized for the purpose of determination of trace metal ions in 0.10 M acetate buffer solution. Under the optimal conditions, the stripping peak currents showed good linear relationships with Pb(II) and Cd(II) at concentration ranges of 5.0 × 10 –9 ‒1.2 × 10 –6 M and 5.0 × 10 –9 ‒1.2 × 10 –7 M, and the detection limits were 1.2 and 1.5 nM, respectively. The proposed method is applicable to the simultaneous determination of trace Pb(II) and Cd(II) in real water samples with the relative standard deviations of less than 4.4% and the recovery rates of 97.9‒102.2%.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2018
·
IF 2.795
Lelin Zeng,Yan Liu,Tao Yang,Yunquan Yang,Kewen Tang
Low selectivity and weak stability constantly restrict the industrial application of emulsion liquid membrane (ELM) for metal ions separation. This study proposed an improved ELM system, in which selectivity and stability were simultaneously enhanced for separation of Cd(II)/Cu(II) by adding citric acid and its salt as retardant and buffer difunctional additives. Initially, the separation coefficient ( β Cd/Cu ) in the blank experiment was only 1.15 in 15 min, which indicated that P507 exhibited a poor selectivity as a carrier. After adding citrate additives, the β Cd/Cu of the improved ELM system increased to more than 395.19 for two reasons. Firstly, the selectivity was enhanced by the selective chelation of citrate radicals on the Cu(II) ions, which were trapped in feed solution. Conversely, the Cd(II) ions were preferentially extracted by the P507 and then stripped into internal phase. Secondly, the stability was also improved, because the pH variation in the feed solution caused by the instability of membrane breakage was effectively controlled by the citrate additives as a pH buffer. Important variables in the citrate-enhanced ELM system including total citrate concentration, P507 concentration, dosage ratio of H 3 Cit to Na 3 Cit, H 2 SO 4 concentration, and metal ion concentration were studied, respectively. The scale-up continuous experiment was executed in a pilot-scale modified rotating disc contactor with β Cd/Cu of 859.61, which indicated that the citrate-enhanced ELM has considerable industrial application potential for efficient and steady separation of Cd(II)/Cu(II).
研究领域:
环境科学
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化学工程
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DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Weili Wang,Qi Lu,Xiaoliang Ren,Canxiang Liu,Juan Jin,Shuyuan Yin,Jiming Zhang,Jianhua Zhou
A novel chitosan derivative was synthesized by crosslinking reaction of chitosan Schiff base and sodium alginate, and then used as adsorbent for Cd(II) ion. The structure of chitosan derivative was fully characterized and the adsorption behavior of Cd(II) ion was also investigated. The equilibrium and kinetic data fitted well the Langmuir and pseudo-second-order model. The estimated maximum adsorption capacity is 262.47 mg/g. Thermodynamic parameters indicates that at higher temperatures, the process is spontaneous, hence the adsorption is easy. Additionally, the regenerated adsorbent after five cycles could retain 87.15% of the adsorption capacity compared with the freshly prepared adsorbent.
研究领域:
环境化学
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材料科学
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水处理
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吸附技术
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Jiajun Wen,Zhongwu Li,Changsheng Jin,Jia Chen,Changqing Cai
Dissolved organic matter (DOM) or iron/manganese (hydro)oxides were important factors in the migration of Cd in sediments of wetlands. DOM and Fe oxides simultaneously affect the longitudinal and transverse migration of Cd in wetlands sediments of plants was still unclear. In this study, a 14-day rhizobox experiment was conducted and the result showed that the rhizosphere effect of Cd migration was only limited to the upper layer of sediments (− 2 to − 4 cm). Fe with fulvic acid (FA) simultaneously existed can precipitate Cd(II) from supernatant to sediments downward. Fe oxides at sediment concentration could effectively prevent Cd(II) from migrating to root surface (0.21 vs 0.02 at%). While Fe oxides with FA together at sediment concentration could effectively promoted the migration of Cd(II) to root surface (0.07 vs 0.08 at%). The formation of organo-metallic complexes of Fe in the presence of FA profoundly proved this finding (increased by ~33.0%). And the polysaccharides and aromatics in organic matter were the chief functional groups participating in the incorporation of Cd and Fe oxides. The findings reveal the migration rules of Cd(II) in sediments by FA and Fe oxides and give an insight into the mechanisms of Cd(II) migration to the root surface around wetland plants.
研究领域:
环境科学
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植物学
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DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 41
·23474-23483
·
IF 3.049
Chunsheng Xie,Shoulian Wei,Dan Chen,Wenying Lan,Zijun Yan,Zhenxing Wang
In this work, a magnetic ion imprinted polymer (MIIP) with specific recognition capability toward cadmium was prepared by a sol–gel method using waste beer yeast, which is a macromolecule biomass, as a functional monomer. The obtained Cd(II)-MIIP was characterized using scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy and adsorption experiments. Then, a MIIP adsorbent based magnetic solid phase extraction (MSPE)-graphite furnace atomic absorption (GFAA) method was established to analyze the cadmium content in food and environmental samples. The maximum cadmium adsorption capacities by the MIIP and magnetic non-imprinted polymer (MNIP) were 62.74 and 32.38 mg g−1, respectively. The absorption by the MIIP was fitted using a pseudo-second-order kinetic model. The Cd(II)-MIIP demonstrated superior absorption capability for selective removal cadmium. The recovery rate of the MIIP was 90.7% after four adsorption–desorption cycles. The calculated Cd(II) detection limit (S/N = 3) was 0.18 μg L−1 with the relative standard deviation (RSD) equal to ∼3.5% for 10 μg L−1 of Cd(II) standard solution. Our proposed method was successfully used in detecting Cd(II) in aqueous samples. The results obtained in this work suggest that the Cd(II)-MIIPs might be promising adsorbents to remove harmful cadmium ions from aqueous samples.
研究领域:
环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
·
2022
·
IF 2.731
Ling Yu,Jing-Wei Wan,Xian-Zhu Meng,Hui-Wen Gu,Ying Chen,Hong-Chao Yi
The establishment of a simple and effective method for determination of heavy metal ions has great significance due to the high hazard of heavy metal ions to public health and environments. Herein, we developed a facile way to synthesise a nanocomposite comprised of carbon nanotubes (CNTs) and metal-organic frameworks (MOFs), and explored its application in constructing an electrochemical (EC) sensor for detection of Cd2+ in aqueous solutions. The sensing surface was simply fabricated by casting a drop of CNTs-MOFs nanocomposite onto the electrode. After drying at room temperature, the modified electrode was immersed in a Cd2+-containing acetate buffer solution to accomplish the EC measurement. The morphology of materials was characterised by SEM. The EC characterisations validated the good conductivity and excellent Cd2+-responsive property of CNTs-MOFs. As expected, the analytical performance for Cd2+ determination was satisfactory with a wide linear detection range of 0.3 μM-150 μM, a limit of detection (LOD) of 0.2 μM and good selectivity. Detection of Cd2+ in real samples was also realised. Moreover, if under other potentials, even the analysis of other heavy metal ions such as Pb2+ and Cu2+ can be achieved with our sensing platform. This work provided a versatile way for detecting heavy metal ions in complicated samples.
研究领域:
环境科学
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分析化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）