ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Peishan Hu,Yuxuan Zhang,Haiyan Wei,Wei Zhang,Liqun Song,Mengping Zhang,Xiao Meng,Ming Shang,Cuijuan Wang
Phthalic acid esters (PAEs) are ubiquitous environmental contaminants, and their real-time monitoring and removal remain challenging. Herein, a point-of-use (POU) device integrating adsorption, surface-enhanced Raman spectroscopy (SERS), and removal strategy was developed and realized ultrafast on-site determination of PAEs and cleanup of them from water. A piece of flexible melamine sponge (MS) was coated with gold nanostars (AuNSs) and metal–organic frameworks (MOFs), thus obtaining SERS activity and adsorption capacity. Based on this multifunctional AuNSs@MOFs/MS composite, clear trends were observed between SERS signal intensity and concentration of di(2-ethylhexyl)phthalate (DEHP) and dibutyl phthalate (DBP). The method detection limits of DEHP and DBP were calculated to be 0.75 × 10–7 and 0.67 × 10–7 M in water, respectively, proving good sensitivity. Furthermore, this POU device exhibited satisfactory adsorption capacity (∼82.3 g/g for DBP and ∼90.0 g/g for DEHP), high adsorption efficiency (equilibrium in 100 s), and good regeneration capability (removal efficiency >70% after 5 cycles). The applicability of this device was verified by its good determination and removal performance in real environmental water matrices. The whole process could be completed within 5 min. This approach provides a new POU alternative for real-time monitoring and removal of PAEs in water.
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DESALINATION
·
2026
·
IF 9.9
Lihong Lu,Fang Yang,Xingyu Zhong,Hongfa Shi,Junran Zhang,Xin Liu,Wenqing Zhang,Lingfan Zhang
In the present work, a novel Congo red/Chitosan@Melamine Sponge composite (CRCS@MS) was successfully fabricated via a facile crosslinking strategy, adhering to the “waste control by waste” concept, for the efficient elimination of U(VI) from aqueous systems. Systematic physicochemical analyses confirmed the successful grafting of amino and sulfonic acid groups within the preserved three-dimensional porous skeleton of the material. Batch adsorption tests demonstrated that U(VI) adsorption onto CRCS@MS complied with the Sips model, indicating a monolayer-dominated adsorption process. A removal efficiency of 98.58% was achieved under optimized conditions. The composite maintained over 90% removal after four consecutive cycles, which indicated that it exhibited a certain degree of reusability, and it exhibits stable adsorption performance in real seawater and river water environments with certain uranium concentrations. Mechanistic studies revealed that the adsorption process was primarily dominated by electrostatic interactions between sulfonic acid groups and U(VI), with amino and hydroxyl groups synergistically enhancing the adsorption through hydrogen bonding or coordination interactions, thereby achieving certain U(VI) uptake. Furthermore, machine learning techniques were employed to model the adsorption behavior, with seven models systematically evaluated including Support Vector Regression (SVR) with various kernels, Random Forest (RF), and Artificial Neural Network (ANN). Results demonstrated that the RF model outperformed others, achieving a test set R 2 of 0.9422 with the lowest prediction errors, validating the effectiveness of machine learning in effectively capturing the intricate relationships within adsorption processes. This work provides methodological support for the development of sustainable and efficient adsorbents for radionuclide remediation.
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DESALINATION
·
2026
·
IF 9.9
Lihong Lu,Fang Yang,Xingyu Zhong,Hongfa Shi,Junran Zhang,Xin Liu,Wenqing Zhang,Lingfan Zhang
Organic azo dyes were employed for the first time to modify chitosan-based composite materials for uranium removal. • Pearson analysis identified initial U(VI) concentration and adsorbate volume as key features. • Good reusability (>90% after 4 cycles) and stable performance in real water matrices. • Mechanism: sulfonic acid groups coordinated with U(VI), synergistically enhanced by amino and hydroxyl groups. • Random Forest model accurately predicted adsorption capacity (R 2 = 0.9422). In the present work, a novel Congo red/Chitosan@Melamine Sponge composite (CRCS@MS) was successfully fabricated via a facile crosslinking strategy, adhering to the “waste control by waste” concept, for the efficient elimination of U(VI) from aqueous systems. Systematic physicochemical analyses confirmed the successful grafting of amino and sulfonic acid groups within the preserved three-dimensional porous skeleton of the material. Batch adsorption tests demonstrated that U(VI) adsorption onto CRCS@MS complied with the Sips model, indicating a monolayer-dominated adsorption process. A removal efficiency of 98.58% was achieved under optimized conditions. The composite maintained over 90% removal after four consecutive cycles, demonstrating good reusability, and exhibited stable adsorption performance in real seawater and river water matrices. Mechanistic studies revealed that the adsorption process was primarily dominated by electrostatic interactions between sulfonic acid groups and U(VI), with amino and hydroxyl groups synergistically enhancing the adsorption through hydrogen bonding or coordination interactions, thereby achieving efficient U(VI) uptake. Furthermore, machine learning techniques were employed to model the adsorption behavior, with seven models systematically evaluated including Support Vector Regression (SVR) with various kernels, Random Forest (RF), and Artificial Neural Network (ANN). Results demonstrated that the RF model outperformed others, achieving a test set R 2 of 0.9422 with the lowest prediction errors, validating the effectiveness of machine learning in effectively capturing the intricate relationships within adsorption processes. This work provides methodological support for the development of sustainable and efficient adsorbents for radionuclide remediation. Download: Download high-res image (144KB) Download: Download full-size image
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ACS Applied Engineering Materials
·
2026
·
IF 3.5
Xiaorong Liu,Rui Wang,Mingyun He,Hongji Li,Xiaona Li,Kaili Wang,Xinwu Xu,Jianzhang Li
Although soybean meal (SM) adhesive holds promising prospects as an eco-friendly alternative to formaldehyde-based resins, its practical application remains constrained by issues such as poor bonding strength and inadequate water resistance. In this work, a multifunctional SM-based adhesive (SMG/CKF/MP), featuring high bonding strength, water resistance, flame retardancy, and antimildew, was successfully fabricated via the integration of in situ regenerated cellulose nanofiber-anchored kenaf fibers (CKF) and supramolecular self-assembled melamine-phytate nanoplates (MP). When subjected to external forces, CKF with its surface-loaded nanofiber structure effectively promoted interfacial bonding with the SM matrix by generating efficient mechanical interlocking and extensive hydrogen bonding interactions. Meanwhile, the two-dimensional rigid architecture of MP bridged soybean protein chains and CKF through electrostatic and hydrogen bonding interactions, enhancing load transfer and energy dissipation. As expected, the wet shear strength and fracture toughness of the plywood prepared by the modified SMG/CKF/0.5MP adhesive increased to 1.15 MPa and 618 mJ, which are about 379% and 2587% higher than those of the unmodified SM adhesive. Meanwhile, the SMG/CKF/MP adhesive exhibited superior flame retardancy and antimildew properties. This study provides a green and low-cost preparation strategy for high-performance biomass adhesives, further expanding the development and application of biomass adhesives.
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TALANTA
·
2023
·
IF 6.1
Yuanyuan Chen,Peng Zhao,Yi Liang,Yi Ma,Yiyi Liu,Jinsong Zhao,Jingzhou Hou,Changjun Hou,Danqun Huo
Herein, we developed a unique screen-printed carbon electrode (SPCE) with three-dimensional melamine-doped graphene oxide/MXene composite aerogel (3D MGMA) modification, which is used for the simultaneous and sensitive detection of three metal ions (Zn 2+ , Cd 2+ , and Pb 2+ ) in the environment. A self-assembly method was used to fabricate 3D MXene aerogels based on MXene, graphene oxide (GO), and melamine . Notably, the network-like 3D structure combining 2D MXene and rGO sheets can provide a high ratio of surface area and enriched functional clusters, which are beneficial for improving the electrical conductivity and promoting the uptake of heavy metal ions. In the linear range of 3–900 μg L -1 , the constructed innovative sensing platform can sensitively detect Zn 2+ , Cd 2+ , and Pb 2+ simultaneously, with detection limits of 0.48 μg L -1 ,0.45 μg L -1 and 0.29 μg L -1 respectively. This work reflects precision and reliability in the detection of three water samples (tap water, Minzhu lake and Yangtze River) and four cereal samples (sorghum, rice, wheat and corn), proposing a novel strategy for monitoring heavy metal ions in the natural environment.
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Analytical Methods
·
2023
·Vol. 16
·期 3
·411-419
·
IF 3.1
Xiaohui Ren,Xinyue Song,Lili Wang,Wenjie Ma,Xin Li
The reliable and accurate detection of unauthorized additives in food is significant to prevent health risks. In recent years, surface-enhanced Raman spectroscopy (SERS) with fast, simple, and sensitive capabilities has been widely used for food safety analysis. In order to detect illegally added dye molecule rhodamine 6G and small molecule melamine in food, we have proposed a fast, convenient, and label-free SERS detection technology using flower-like Ag/ZnO as the SERS substrate. The structure and morphology of the flower-like Ag/ZnO were characterized by scanning electron microscopy, energy dispersive spectrometery, transmission electron microscopy, and X-ray diffraction analysis. We investigated the SERS effect and sensitivity of flower-like Ag/ZnO toward rhodamine 6G and melamine. The synergistic effect of flower-like Ag/ZnO provides high SERS activity for the detection of rhodamine 6G and melamine at the lowest detection concentrations of 0.5 ng mL−1 and 1.0 ng mL−1, respectively. Therefore, flower-like Ag/ZnO with good sensitivity and uniformity has potential for improving the detection of illegal food additives.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 28
·8071-8079
·
IF 4.478
Wei Wei,Lu Zenghui,Wu Ting,Wang Haibo,Han Qiang,Liang Qionglin
In this study, a covalent organic framework (COF)-TpBD-supported melamine sponge (MS) was fabricated through a one-step hydrothermal method. The obtained monolithic column was then applied in in-syringe solid-phase extraction (IS-SPE) for the separation of three volatile ingredients from serum samples. Given credit for the superior adsorption capacity of the COF and the homogeneous microporous property of MS, the developed column exhibited satisfactory separation of the targets. And the dominating adsorption mechanism was the hydrophobic interaction forces between TpBD and targets and the high mass transfer efficiency provided by the large pore structure of MS. The results of dynamic adsorption showed that the MS@TpBD column displayed much better adsorption performance than blank MS and TpBD. And it has featured great reusability up to 5 cycles and obtained satisfied recovery values (87.9 ~ 110.3%) in serum samples. As a result of sample clean-up, this column offers low limit of detections (LODs) down to 0.014, 0.010, and 0.020 μg/mL, respectively. In summary, we believe that this convenient separation column has prominent application promise in the fields of separating activity ingredients in biological samples.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 9
·51724
·
IF 3.125
Xiaoqing Qiu,Daqian Wang,Qing Li,Xiaoyue Li,Xiaowei Zhao,Zhiwei Li,Xiaohong Li,Zhijun Zhang
Melamine-formaldehyde (MF) foam has wide applications due to good flame retardancy, excellent sound absorption, and high thermal stability. However, the recycling of MF foam wastes remains a challenge due to its thermosetting nature. Here, we demonstrate a new strategy for discarded foams as solid adsorbents for removing tin ions in simulated tin-containing wastewater. Results showed that the removal rate of tin in simulated wastewater is as high as 99.996%. Moreover, after simple calcination, as-obtained products can be used as high-efficiency flame retardants for flexible poly(vinyl chloride) (PVC), reducing the peak of heat release rate and total smoke production of PVC by 51.8% and 45.8%, respectively, under the condition of 2.5 wt.% addition. In short, this strategy successfully converted MF foam and tin wastewater to valuable flame retardants, opening the way for the environmentally friendly recycling of MF waste and the simultaneous treatment of tin-containing wastewater.
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BIOSENSORS & BIOELECTRONICS
·
2018
·
IF 8.173
Yue Hua,Min Liu,Shuai Li,Fengjuan Liu,Yuanyuan Cai,Huan Liu,Yuqi Wan,Xiaoxia Lv,Hua Wang
An electroanalysis strategy has been developed for probing glutathione (GSH) separately in hela and yeast cells based on the displacement reaction route using melamine-copper (MA-Cu) nanocomposites . Herein, MA-Cu nanocomposites were initially synthesized by the controlled supermolecular self-assembly process showing various morphological structures depending on the MA-to-Cu ratios used. It was discovered that the electrodes modified with rod-like MA-Cu nanocomposites could achieve the stable electrochemical output of solid-state CuCl at a low potential, which might circumvent the possible interference from co-existing electroactive substances in complicated backgrounds like cells. More importantly, the yielded CuCl signals would decrease selectively induced by GSH through the specific Cu-GSH interaction that would trigger the displacement of CuCl into non-electroactive complex. The MA-Cu nanorods-modified electrodes can allow for the detection of GSH with the concentrations linearly ranging from 0.010 to 300.0 μM. Subsequently, the feasibility of the developed electroanalysis strategy was demonstrated for the evaluation of GSH separately in the extractions of hela and yeast cells, promising the wide applications in the clinical and food analysis fields.
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Food Analytical Methods
·
2014
·Vol. 7
·期 9
·1763-1769
·
IF 1.802
Zhang Yanping,Ma Xiaoguo,Fan Yingming
A method for rapid and sensitive determination of melamine in aquatic products by gas chromatography–mass spectrometry with microwave-assisted derivatization was proposed in this paper. Melamine was extracted from aquatic product samples using methanol, and the extract was cleaned with a mixed-mode cationic exchange solid phase extraction column. After elution with 5 % ammonia–methanol solution and drying with nitrogen, the residue was derivatized using N,O-bis(trimethylsilyl)trifluoroacetamide containing 1 % trimethylchlorosilane under microwave irradiation for 1 min with a power of 420 W, then detected with gas chromatography–mass spectrometry, and quantified by the external standard method. Some important parameters such as extraction solvent, microwave irradiation power and time, and derivatization reagent volume were investigated and optimized. The results showed that methanol could effectively extracted melamine from aquatic products as well as precipitated the protein in samples. Under the optimum conditions, the detection limit for melamine was as low as 0.006 mg/kg, and the linear range was from 0.02 to 50 mg/kg with a correlation coefficient of 0.9997. The proposed method was applied to the analysis of melamine in aquatic products (fish, shrimp, clam, and winkle), and the recovery for melamine was 89.65–105.16 % with relative standard deviation of 3.0–6.0 %.
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MICROCHIMICA ACTA
·
2015
·Vol. 183
·期 1
·441-448
·
IF 3.741
Cao Gen-Xia,Wu Xiu-Ming,Dong Yu-Ming,Li Zai-Jun,Wang Guang-Li
We describe a colorimetric assay for the quantitation of melamine (MA). It relies on the observation that MA reverses the inhibition of the light-triggered activity of horseradish peroxidase (HRP) functionalized gold nanoclusters (HRP-Au NCs) by Hg(II) ions. The HRP-Au NCs catalyze the oxidation of the substrate 3,3’,5,5’-tetramethylbenzidine (TMB) by dissolved oxygen if exposed to visible light provided by a 300 W Xe lamp (λ ≥ 400 nm). The addition of Hg(II) suppresses the enzymatic activity due to the metallophilic interaction between Hg(II) and Au(I) present on the surface of the HRP-Au NCs. MA with its triazole ring can restore the catalytic activity of the HRP-Au NCs by inhibiting the metallophilic interaction. As a result of these findings, a colorimetric “turn-on” assay for MA was worked out that can be used to determine MA in the 0.2 to 15 μmol·L −1 concentration range and with a 72 nmol·L −1 detection limit, which is much lower than the established safety limit. The method was successfully applied to the quantitation of MA in (spiked) raw milk and milk powder, with recoveries ranging from 98.5 % to 101.5 %.
We describe a colorimetric assay for the quantitation of melamine (MA). It relies on the observation that MA reverses the inhibition of the light-triggered activity of horseradish peroxidase (HRP) functionalized gold nanoclusters (HRP-Au NCs) by Hg(II) ions.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2013
·Vol. 18
·期 1
·105-113
·
IF 2.279
Li Hongying,Wang Xueliang,Yu Zhangyu
An electrochemical sensor for simultaneous determination of dopamine (DA), uric acid (UA), guanine (G), and adenine (A) has been constructed by copolymerizing melamine monomer and Ag ions on a glassy carbon electrode (GCE) with cyclic voltammetry. The poly-melamine and nano Ag formed a hybridized film on the surface of the GCE. The morphology of the film was characterized by scanning electron microscope. The electrochemical and electrocatalytic properties of this film were characterized by cyclic voltammetry, linear sweep voltammetry, and square wave voltammetry (SWV). In 0.1 M phosphate buffer solution (pH 4.5), the modified electrode resolved the electrochemical response of DA, UA, G, and A into four well-defined voltammetric oxidation peaks by SWV; the oxidation peak current of DA, UA, G, and A increased 13-, 6-, 7-, and 9-fold, respectively, compared with those at the bare GCE and the SWV peak currents of DA, UA, G, and A with linear concentrations in the ranges of 0.1–50, 0.1–50, 0.1–50, and 0.1–60 μM, respectively. Based on this, a method for simultaneous determination of these species in mixture was setup. The detection limits were 10 nM for DA, 100 nM for UA, 8 nM for G, and 8 nM for A.
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