Analytical Methods
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2014
·Vol. 6
·期 12
·4102-4106
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IF 1.938
Tianyu Yao,Qin Tu,Xiang Han,Longlong Zhang,Dong-En Wang,Manlin Li,Sheng Chen,Jinyi Wang
Based on the formation of a red [Cd-diphenylcarbazide] complex, a simple and visible method for Cd2+ colorimetric detection was developed by doping SiO2 nanoparticles and diphenylcarbazide in polymethylmethacrylate electrospun fibers. Benefiting from the large surface area due to the addition of SiO2 nanoparticles, the color of the fibrous film changed clearly even in the presence of extremely low concentrations of Cd2+. The detection limit was found to be 1 × 10−8 M. Investigation of the selectivity of the fibrous film on the detection of various metal ions showed that only Cd2+ could induce a yellow-to-red color change. The results demonstrated that SiO2 and diphenylcarbazide doped polymethylmethacrylate fibrous films could act as highly selective strips for the detection of Cd2+ with little interference from other metal ions.
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JOURNAL OF HAZARDOUS MATERIALS
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2025
·
IF 11.3
Wenjie Li,Pengfei Mao,Xuwen Chen,Wanting Ling,Chao Qin,Yanzheng Gao
Developing efficient passivating sorption materials for the treatment of combined pollution by phthalate esters (PAEs) and Cd 2+ has become a critical focus in environmental protection and soil remediation. In this study, biochar-sulfhydryl modified montmorillonite composites (BC-SHMMT) were synthesized, characterized, and evaluated for the co-sorption of PAEs (DMP, DEP) and Cd 2+ . The integration of sulfhydryl-modified montmorillonite (MMT-SH) with biochar improved the material's surface structure, enhancing both co-sorption capacity and structural stability. Molecular dynamics simulation indicated a monolayer chemical sorption of pollutants by BC-SHMMT, in alignment with the sorption theoretical model. In the co-sorption system, the coexistence of pollutants increased the adsorption of Cd 2+ and decreased the sorption of PAEs. The smaller molecular size and higher diffusion coefficient of Cd 2+ facilitated its pore filling and interaction with oxygen-containing functional groups of the material, leading to competition with PAEs for sorption sites. Notably, the ion exchange and complexation of Cd 2+ adsorption by MMT-SH are pivotal in enhancing BC-SHMMT co-sorption capacity. These findings provide valuable insights into the development of eco-friendly novel materials and the improvement of co-pollution remediation efficiency.
研究领域:
环境科学
·
土壤修复
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RSC Advances
·
2017
·Vol. 7
·期 13
·7996-8003
·
IF 3.108
Shuibin Cen,Weiming Li,Shiying Xu,Zhihong Wang,Youwen Tang,Haishui Wang,Chaohai Wei
This work demonstrates a simple strategy for producing highly selective adsorption magnetic ion imprinted mesoporous silica (MIIMS) nanocomposites. They have been functionalized by a γ-(aminoethylamino)propyl chelating group for specific recognition and rapid removal of toxic heavy metal ions from wastewaters. The superparamagnetic Fe3O4 nanocrystal was encapsulated in an imprinted mesoporous organosilica shell via a co-condensation synthesis method. The results of transmission electron microscopy (TEM) and small angle X-ray diffraction (XRD) confirmed that the imprinted mesoporous organosilica shell preserved a highly ordered 2D mesostructure. The Brunauer–Emmett–Teller (BET) analysis found the surface area was 946 m2 g−1. The saturated adsorption capacity of MIIMS toward cadmium reached up to 25.2 mg g−1 (0.224 mmol g−1) at pH 5.0. The adsorption of cadmium reached an equilibrium within 4.5 min. The results of a selectivity study revealed that the adsorption capacity for Cd2+ is much high than other co-existing heavy metal ions. The adsorption efficiency of MIIMS was above 94.2% after six extraction-stripping cycles. The MIIMS can efficiently remove cadmium ions in water treatment applications.
研究领域:
环境科学
·
材料科学
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Jianzhe Ma,Mingzhu Xia,Sidi Zhu,Fengyun Wang
In this paper, a new nanobiomaterial, alendronate hydroxyapatite (AL-HAP), was synthesized by the conventional co-precipitation method with alendronate (AL) as dopant, and applied in the removal of heavy metal contaminants for the first time. The characterization results showed that the crystallinity of the AL-HAP nanocomposite biomaterials after doping has been greatly deteriorated, and the pore volume and pore size increased. When the doping amount of AL was 10 %, the maximum adsorption capacity of AL-HAP for Pb 2+ , Cd 2+ and Cu 2+ can reach 1431.8, 469 and 226.6 mg/g, respectively, which was much higher than that reported in other literature. Meanwhile, the adsorption mechanism of AL-HAP for heavy metal ions was discussed from both the views of experimental and Multiwfn program theoretical calculation based on density functional theory (DFT). Quantitative molecular surface analysis was carried out for the first time to study the minimum points and the positions of electrostatic potential (ESP) and average local ionization energy(ALIE), as well as the exact values, giving more accurate and reliable analysis conclusions for the reaction sites and binding mode. In addition, the independent gradient model (IGM) method was also firstly applied to investigate the interactions between AL and HAP or AL-HAP nanocomposite with metal ions. AL-HAP is a potential adsorption material for heavy metal wastewater treatment and soil remediation because of its advantages such as convenient synthesis, excellent adsorption performance and no secondary pollution.
研究领域:
材料科学
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环境科学
·
生物医学
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2014
·
IF 3.552
Zhichao Sun,Yunguo Liu,Yuanqing Huang,Xiaofei Tan,Guangming Zeng,Xinjiang Hu,Zhongzhu Yang
In this study, the removal of Cd 2+ and Pb 2+ from aqueous solutions was investigated using a novel chelating material. The first part described the synthesis of ethylene glycol-bis(2-aminoethylether)-N,N,N′,N′-tetraacetic acid dianhydride (EGTAD), mercerization treatment of ramie fiber (MRF), and the MRF was then reacted with EGTAD to prepare the new material (ERF). The obtained material was characterized by weight gain, SEM, FTIR, and elemental analysis. The results of FTIR and elemental analysis confirmed that ester bond, carboxyl and amine groups were introduced onto ERF. The adsorption capacity of metals on ERF was evaluated at different contact times, pH values, initial metal concentrations, and temperatures in the second part. The adsorption equilibrium was reached within 5 min for Cd 2+ and Pb 2+ . Adsorption isotherm could be well fitted by the Langmuir model, and the maximum adsorption capacities were 159.11 and 273.78 mg g −1 for Cd 2+ and Pb 2+ at 298 K, respectively. Thermodynamic analysis showed that the adsorption process was spontaneous and endothermic. The molar ratio of adsorbed cation to grafted EGTA is close to 1.8:1, which confirmed that the adsorption was chemical process involving both surface chelation reaction and ion exchange. In addition, the absorbent was successfully regenerated using HCl and ultrasonic treatment.
研究领域:
环境科学
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材料科学
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Nanomaterials
·
2022
·Vol. 12
·期 1
·151
·
IF 5.719
Ivan D. Skurlov,Wenxu Yin,Azat O. Ismagilov,Anton N. Tcypkin,Haohang Hua,Haibo Wang,Xiaoyu Zhang,Aleksandr P. Litvin,Weitao Zheng
Metal halide perovskite nanocrystals (NCs) attract much attention for light-emitting applications due to their exceptional optical properties. More recently, perovskite NCs have begun to be considered a promising material for nonlinear optical applications. Numerous strategies have recently been developed to improve the properties of metal halide perovskite NCs. Among them, B-site doping is one of the most promising ways to enhance their brightness and stability. However, there is a lack of study of the influence of B-site doping on the nonlinear optical properties of inorganic perovskite NCs. Here, we demonstrate that Cd2+doping simultaneously improves both the linear (higher photoluminescence quantum yield, larger exciton binding energy, reduced trap states density, and faster radiative recombination) and nonlinear (higher two- and three-photon absorption cross-sections) optical properties of CsPbBr3NCs. Cd2+doping results in a two-photon absorption cross-section, reaching 2.6 × 106Goeppert-Mayer (GM), which is among the highest reported for CsPbBr3NCs.Keywords:perovskite;nanocrystal;doping;nonlinear optical properties;photoluminescence;two-photon absorption
研究领域:
材料科学
·
光学
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Bingxiang Liu,Tong Chen,Bing Wang,Shaoqi Zhou,Zihang Zhang,Yucheng Li,Xiaoxue Pan,Ning Wang
The sesame straw-derived biochar was successfully prepared via alkaline hydrogen peroxide (AHP) pretreatment in this study. Systematic experimental characterizations, 15 relevant batch and column adsorption models, combined with density functional theory (DFT) calculation were used to investigate the performances and micro-mechanisms of Cd 2+ adsorption onto biochar. We found AHP-pretreatment could greatly improve the adsorption performance of biochar for Cd 2+ . The maximum Cd 2+ adsorption capacity of AHP-pretreated biochar (87.13 mg g −1 ) was much larger than that of unpretreated biochar. Cd 2+ adsorption was mainly dominated by the chemisorption of the homogeneous surface monolayer. The hydroxyl and carboxyl groups on the surface of biochar provided preferential adsorption sites, and liquid film diffusion and intra-particle diffusion were two dominant rate-controlling steps. Our results showed that ion exchange, co-precipitation, surface complexation, and Cd 2+ -π interaction were the dominant adsorption mechanisms. Especially, DFT calculations well-identified that lone-pair electrons during complexation and π electrons during coordination were provided by oxygen-containing functional groups and aromatic rings, respectively. The experimental breakthrough curves fitted better with the theoretical value of the BJP model, compared to Thomas, Yoon-Nelson, and EXY models. Overall, our study provides a promising method for Cd 2+ removal from wastewater and resource utilization of agricultural wastes.
研究领域:
环境科学
·
材料科学
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Case Studies in Construction Materials
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2026
·
IF 6.9
Jiale Yu,Jiayang Zhu,Cheng Wang,Binmeng Chen
This study evaluated the feasibility of using cadmium-containing wastewater (CCW) as mixing water for cement paste and elucidated the coupled relationship among hydration evolution, pore structure evolution, permeability variation, and Cd 2+ transport under different pH conditions. The results demonstrated that the initial pH of CCW significantly influenced cement hydration and pore connectivity, thereby controlling Cd 2+ transport and leaching behavior. Specifically, H + ions inhibited cement hydration and etched the hydration products, resulting in a porous structure while OH - ions accelerated the hydration and increased the amount of hydration products, refining the pore structure. It is worth noting that as the pH increases, the dominant Cd species gradually shifted from the highly mobile free Cd 2+ (which prevails under strongly acidic conditions, though minor hydroxy complexes like Cd(OH) + may also coexist) towards less soluble hydroxide complexes and ultimately to stable precipitates such as Ca 0.67 Cd 0.33 CO 3 , which further enhanced pore tortuosity and inhibited Cd 2+ migration. Furthermore, the Katz-Thompson model revealed the pH-regulated evolution of permeability-controlling pore structures, showing a strong linear correlation with Cd leaching (R 2 =0.979). Permeability-controlling pores shifted from bimodal distributions (1–10 μm and 0.003–0.01 μm) under acidic conditions to a concentrated micropore range (0.003–0.01 μm) under alkaline conditions. These findings established a predictive permeability-controlled framework that quantitatively links micro structure to leaching behavior, providing theoretical support for the safe utilization of CCW in construction materials.
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DALTON TRANSACTIONS
·
2026
·
IF 3.3
Xin Wang,Linlin Zhou,Xin-Mei Hou
Anthropogenic and industrial activities release toxic and non-biodegradable heavy metal ions (HMIs) into the environment, posing severe ecological risks even at trace concentrations and necessitating their critical detection. Voltammetry has been widely adopted as a mainstream analytical technique for this purpose, driving the demand for low-cost electrode materials that offer high sensitivity, low detection limits, and excellent stability. Low-dimensional silicon carbide (SiC) materials hold great promise for electrochemical applications owing to their abundant active sites, large specific surface area, facile surface functionalization, and exceptional robustness in harsh environments including extreme temperatures, strong acids, and strong alkalis. Despite these advantages, studies on the application of low-dimensional SiC materials for HMIs detection remain limited. In this work, we successfully synthesized modified SiC nanosheets and nanowires for the simultaneous electrochemical detection of Pb2+, Cd2+, Cu2+, and Hg2+. The as-prepared SiC-based electrodes exhibited lower detection limits and enhanced sensitivity compared to conventional electrodes. Moreover, they demonstrated excellent stability and reproducibility, underscoring their considerable potential for practical electrochemical sensing applications.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2026
·
IF 5.7
Libin Wang,Min Li,Kaixuan Liu,Chunyuan Liu,Bo Ren
An RF spacer creates a void between NaA and a mesoporous silica shell. • Shell thickness tunes curcumin loading in yolk–shell NaA@HMSNs. • NaA@HMSN-2 loads 124.0 mg/g curcumin and adsorbs Cd 2+ in vitro. • Curcumin release and Cd 2+ adsorption occur in the same buffer system. • HepG2 viability remains above 90% up to 64 μg/mL after 48 h. Cadmium contamination is an environmental and health concern. Here, a yolk–shell composite was constructed using sodium A-type zeolite (NaA) as the microporous yolk and a hollow mesoporous silica nanoparticle (HMSN) layer as the separated shell. Removal of a resorcinol–formaldehyde spacer generated an internal void, and three shell thicknesses were prepared. The NaA component provided Cd 2+ adsorption sites, whereas the amino-functionalized HMSN compartment was used for curcumin loading. N-NaA@HMSN-2, with an approximately 100 nm shell, loaded 124.0 mg/g curcumin. In buffer containing 100 mg/L Cd 2+ , Cur/N-NaA@HMSN-2 released 34.8% and 39.5% curcumin and adsorbed 73.8% and 67.8% Cd 2+ at pH 7.4 and 1.2, respectively. In HepG2 assays, all three NaA@HMSN carriers maintained more than 90% relative cell viability at concentrations up to 64 μg/mL after 48 h. These findings demonstrate coupled Cd 2+ adsorption and curcumin release under in vitro conditions and support further evaluation of this bifunctional material platform. Download: Download high-res image (96KB) Download: Download full-size image
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Zhenzhen Xie,Wei Jia,Xingzhen Li,Lei Pan,Shihao Xu,Changlong Jiang
Cadmium ion (Cd 2+ ) pollution poses severe environmental and health risks due to its high toxicity, bioaccumulation potential, and persistence. Although traditional detection methods require bulky instruments and complex procedures, limiting the suitability for rapid on-site analysis. The paper introduces aptamer-based fluorescent probes and double-stranded fluorescent probe based on an aptamer and its complementary DNA (cDNA). The former is composed of aptamers and SYBR Green dyes. The detection range of Cd 2+ is 0–8 μM, and limit of detection (LOD) is 15 nM. The probe consists of a double-stranded structure formed by a 5′-FAM-labeled Cd 2+ aptamer and a 3′-BHQ1-modified cDNA. By combining this probe with a hydrogel matrix, a smartphone-based sensing platform is constructed, which enables highly sensitive and convenient detection of Cd 2+ . It indicated that the detection range of the probe for Cd 2+ is 0–50 μM, with the LOD of 27.6 nM. Molecular dynamics simulations (MD) disclosed the binding mechanism of the aptamer and Cd 2+ : the specific recognition by nucleobases such as G9, C12, and T17 in the Coulomb force-driven double-twisted folding conformation plays a crucial role. Further integrating the probe into the hydrogel matrix constructed the dsDNA@hydrogel platform successfully achieved real-time visual detection of Cd 2+ in environmental samples. It not only offers a highly sensitive and cost-effective new approach for heavy metal detection, but promotes the advancement of portable environmental monitoring technologies through the innovation of the aptamer-hydrogel system.
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CHEMOSPHERE
·
2019
·
IF 5.108
Shuang Ren,Zhaofu Meng,Xiuxian Sun,Haoyuan Lu,Mengfei Zhang,Altaf Hussain Lahori,Shuaibin Bu
Organic-magnetic bentonites (OMBts), i.e., amphoteric modified MBt (BS-MBt), amphoteric-cationic modified MBt (BS-CT-MBt) and amphoteric-anionic modified MBt (BS-SDS-MBt), obtained by modifying magnetic bentonite (MBt) with amphoteric surfactant (BS), cationic surfactant (CT) and anionic surfactant (SDS) were investigated with the aim to remove cadmium (Cd 2+ ). The modifier contents, surface charge and Cd 2+ adsorption performances of OMBts were compared, and the influences of pH, temperature and ionic strength on Cd 2+ removal were evaluated. Results showed that modifier contents of OMBts increased in the order: BS-CT-MBt > BS-MBt > BS-SDS-MBt. Although CEC of adsorbents increased in the order: MBt > BS-MBt > BS-SDS-MBt > BS-CT-MBt. The BS-MBt exhibited the highest Cd 2+ adsorption capacity (233.19 mmol kg −1 ) than other adsorbents. The adsorption isotherms could be well described by Langmuir model. The Cd 2+ adsorption capacities on MBt and OMBts increased with an increase in pH, temperature and with a decrease of ionic strength. According to characterizations (FT-IR and XPS) and experiments, Cd 2+ adsorption on MBt and OMBts most possibly involved electrostatic interaction, ion exchange, and surface complexation. Furthermore, the adsorption of Cd 2+ on BS-MBt was also attributed to the chelation. The amidocyanogen group of BS-CT-MBt inhibited adsorption of Cd 2+ due to electrostatic repulsion, while Cd 2+ was adsorbed on BS-SDS-MBt through electrostatic attraction induced by the sulfo group.
研究领域:
环境科学
·
材料科学
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危险品化学品经营许可证（带存储）