FOOD CHEMISTRY
·
2025
·
IF 9.8
Lijun Wei,Bixiao Zhou,Mengdie Cai,Xinyu Wang,Guowen Zhang,Xianglei Cheng
Ethylene thiourea (ETU) and propylene thiourea (PTU), the degradation products of dithiocarbamates, are carcinogenic, teratogenic, and mutagenic. In this study, we developed an ultrasensitive method for the simultaneous detection of ETU and PTU using amidated carbon quantum dots (A-CDs) as chemiluminescent probes. The distinctive chemiluminescence (CL) mechanisms of the A-CDs were elucidated using CL spectroscopy, radical trapping experiments, and mass spectrometry. ETU or PTU are oxidized by Ce(IV) resulting in the formation of sulfur-based free radicals. Then the radicals are selectively recognized by the A-CDs accompanying with CL emission. The high-performance liquid chromatography-CL method was validated by quantifying ETU and PTU in vegetables, wherein the detection limit was 0.17 μg·kg −1 . Comparing with previous literatures, the proposed method demonstrated advantages with lower solvent use, shorter detection time, reduced matrix effects, higher accuracy and precision. The results indicated that ETU was really detected in tomatoes, implying the potential risk of public health.
研究领域:
分析化学
·
食品安全
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Wenhui Yan,Shijun Li,Jieyao Wang,Xingyu Ma,Mingxuan Zhang,Lei Li
The recovery of gold from electronic waste by absorption is a sustainable process owing to its easy operation, low cost, and negligible energy consumption. Thiourea groups demonstrate a strong affinity toward Au(III); therefore, microporous polythioureas (PTUs) are believed to be emerging absorbents and advantageous over other porous materials. Motivated by the successful preparation of porous organic polymers (POPs) via domino polymerization in our recent report, the one-pot strategy is introduced to the synthesis of microporous PTUs. During the polymerization process, thiourea knots are formed between the reaction of amino and diisothiocyanate monomers and integrated into networks by the simultaneous self-cross-linkage of alkynyl, acetyl, or double-bond groups on the amine monomers. Eventually, the family of POPs exhibits a maximum surface area of 561 m2 g–1. The thiourea groups and microporous structures endow the products with high Au(III) adsorption capacities (maximum: 1159 mg g–1) and remarkable adsorption selectivity. Even in actual electronic waste, where the concentration of Au(III) (0.18 mg L–1) is much lower than that of other interference ions (approximately 200 mg L–1), 100% removal efficiency is accomplished. This achievement not only verifies the versatility of the domino polymerization methodology for the construction of POPs but also sheds light on the potential application of high-performance gold adsorbents in real scenarios.
研究领域:
环境化学
·
材料科学
·
资源循环利用
·
吸附分离
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2014
·
IF 2.354
Hai-Mu Ye,Ke-Shuo Liu,Qiong Zhou
Study on the structure of PEO–thiourea binary system has been carried out by several groups, but there still remain some questions. In this study, PEO–thiourea complexes with different thiourea fractions were prepared through freeze-drying and characterized by differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXD), Fourier transform infrared (FTIR) microscopy and Raman scattering. A new PEO–thiourea complex with EO:thiourea molar ratio of 4:1 (form II) was demonstrated for the first time. Then the phase diagram of PEO–thiourea binary system was improved, containing two particular complexes at thiourea molar fraction of 0.4 (form I) and 0.2 (form II), respectively. Further analysis suggested that PEO–thiourea form II complex adopts orthorhombic unit cell, and probably takes channel structure with two side-by-side parallel PEO chains incorporated inside the thiourea clathrate. The form II complex is quite stable in pure state at room temperature; while gradually convert into from I by solid–solid transformation when a few form I complex serves as nucleator.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Xiaoqing Yang,Huimin Xiang,Jianying Huang,Chuan Zhou,Ran Ran,Wei Wang,Wei Zhou,Zongping Shao
Lead-free inorganic Cs 2 AgBiBr 6 double perovskites have emerged as promising materials in perovskite solar cells (PSCs) to tackle the inferior stability and toxicity issues of organic–inorganic hybrid PSCs. However, the power conversion efficiencies (PCEs) of Cs 2 AgBiBr 6 solar cells are remarkably restricted by the intrinsic and extrinsic defects of Cs 2 AgBiBr 6 films. More specifically, the fast crystallization process in the formation of Cs 2 AgBiBr 6 films strongly prevents the homogeneous growth of perovskite crystals, leading to inferior Cs 2 AgBiBr 6 film quality. This work introduces a facile strategy to retard the crystallization of Cs 2 AgBiBr 6 perovskites by introducing Lewis base additives into the precursor solution. The incorporation of a strongly coordinated thiourea additive with a sulfur donor leads to the generation of a Lewis acid base adduct, which retards the crystallization process for Cs 2 AgBiBr 6 crystals, improves the quality of the Cs 2 AgBiBr 6 film, decreases the defect density and inhibits charge carrier recombination. After optimization, the cell delivers a superior PCE of 3.07%, surpassing that reported for most Cs 2 AgBiBr 6 -based solar cells in the literature, and exhibits outstanding stability with a PCE retention rate of 95% after 20 days of storage in air. This work provides an effective strategy for further improvements in the performance of inorganic lead-free Cs 2 AgBiBr 6 -based photovoltaic cells .
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yanxi Chen,Fanyun Su,Yuqing Rang,Guangli Liu,Xinxing Xu,Yayun Ma,Jingjing Tang,Xiangyang Zhou,Juan Yang
With the explosive growth in demand for lithium-ion batteries (LIBs), the recycling of the valuable metal components in them has become particularly important. However, in the previous recycling of spent LIBs, lithium is easily lost resulting in wasted resources. In this paper, a new simple and efficient selective lithium extraction strategy is developed, which uses a thiourea-assisted subcritical water system to achieve preferential extraction of lithium from spent LIBs. Due to the enhancement of the lithium extraction process by subcritical water and the synergistic effect of S and N in thiourea on the spent LiNi x Co y Mn z O 2 (NCM) cathode powder, 99.9% of lithium is selectively leached into water. Meanwhile, the transition metals (Ni, Co and Mn) in the leaching residue can be leached out by dilute acid, and the corresponding leaching rates are 99.8%, 99.7%, and 99.9%, respectively. In addition, LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) cathode material with good electrochemical performance is successfully regenerated. The process has been economically and environmentally assessed as greatly simplifying the recycling process and establishing a highly efficient recycling route for spent LIBs with low environmental impact.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 33
·19669-19685
·
IF 3.119
Shuting Zhang,Guoqiang Li,Liyuan Duan,Hongyu Wang,Yongle Zhao,Yongfa Zhang
Graphitic carbon nitride (g-C3N4) was prepared by a simple thermal polymerization method in this work. The effects of precursor type, thermal polymerization temperature, constant temperature time and atmosphere on the crystal structure, morphology, elemental composition, valence distribution, light absorption properties and photocatalytic activity of the prepared photocatalytic materials were investigated. Taking rhodamine B (RhB) as the target degradant, the blue light catalytic activity of the photocatalytic material was studied in detail. The experimental results showed that the final pyrolysis temperature and constant temperature time are positively related to the adsorption characteristics and photocatalytic ability of the prepared materials. In addition, the adsorption capacity and photocatalytic activity of the products obtained in Ar and H2 atmospheres are better than those produced in CO and CH4, which can be attributed to the combined effect of large specific surface area and structural defects of the materials. The sample's large specific surface area, wide band gap, and excellent photogenerated carrier separation and transfer capabilities make the adsorption performance and photocatalytic performance of the products obtained with ammonium thiocyanate and thiourea as precursors better than those prepared from melamine and dicyandiamide. g-C3N4 prepared by using ammonium thiocyanate as precursor at 550 °C for 5 h under a hydrogen atmosphere showed the best catalytic activity for the degradation of RhB under blue light. It was demonstrated that g-C3N4 prepared exhibited good stability and reusability after four repeat experiments. The active components that play major roles in the degradation of RhB described herein were holes and superoxide radicals, which was inferred by free radical trapping experiments. This work provides a theoretical basis for the idea of converting the mixed salts of desulfurization waste liquid containing ammonium thiocyanate into an excellent photocatalyst g-C3N4 with visible light response.
研究领域:
材料科学
·
环境科学
·
光催化技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
HYDROMETALLURGY
·
2022
·
IF 4.217
Chaopeng Liu,Zhongxian Song,Yanli Mao,Xiaole Yan,Zhaoyang Li,Yuzhong Liu,Mengxia Ma,Haiyan Kang,Xu Yan,Deming Gu,Xia Zhang,Zhenzhen Huang
A thiourea-modified weak base anion exchange resin, ZGA451 (thiourea@ZGA451), was prepared. Thiourea@ZGA451 exhibited excellent potential for Au(III) adsorption. The maximum adsorption capacity of Au(III) by thiourea@ZGA451 was 995.6 mg/g at 298 K. The adsorption process followed the Freundlich and pseudo-second-order models, which are monolayer and chemisorption adsorption, respectively. The adsorption mechanism of Au(III) on thiourea@ZGA451 involves electrostatic attraction, chelation, and redox. Thermodynamic experiments showed that the reaction exhibited spontaneous endothermic behavior. Thus, thiourea@ZGA451 possesses outstanding Au(III) adsorption properties.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2017
·Vol. 9
·期 10
·3568-3575
·
IF 7.367
Hong Zhi Zhang,Rong Sheng Li,Peng Fei Gao,Ni Wang,Gang Lei,Cheng Zhi Huang,Jian Wang
Gold nanorods (GNRs) have opened up promising applications based on their reshaping, due to the fact that a tiny change in shape or size could directly lead to optical changes. Herein, we report chemical reshaping of GNRs induced by the coupling reaction between Au, ferric chloride and thiourea. In the coupling reaction, Fe3+ oxidizes the GNRs to yield Au(I), which complexes with the thiourea ligand, lowering the Gibbs free energy of the gold species and promoting the reaction equilibrium to enable the chemical reshaping of the GNRs. This coupling reaction process was monitored using a light-scattering dark-field microscopy (DFM) imaging technique and scanning electron microscopy (SEM). The light scattering underwent a colour change from bright red to yellow and finally to green, and the GNRs underwent a morphological change from rod-shaped to fusiform and finally to spherical, which is somewhat different from the results of other chemical etching processes of GNRs. It is believed that the coupling reaction induced chemical reshaping of GNRs not only provides an alternative way to monitor the coupling reaction, but also offers a facile way to obtain a desirable GNR morphology, which is important for the preparation of fusiform nanostructures.
研究领域:
纳米材料科学
·
光学成像
·
化学动力学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yingqi Xia,Lijia Liu,Yudan Wang,Chunhong Zhang,Yawen Liu
CH 3 Hg + in water is a neurotoxin that is difficult to eliminate and is readily absorbed by the human body through food chains. In this study, thioctic acid was grafted onto the surface of NH 2 -MIL-101 via an amidation reaction to prepare an adsorption material for the rapid and effective removal of CH 3 Hg + , which is designated as LA-MIL-101.The synthesis of LA-MIL-101 was confirmed through analyses including FT-IR, XRD, SEM, TGA, and XPS. BET results indicate that the specific surface area of LA-MIL-101 is 464.92 m 2 ·g −1 . The ideal conditions for CH 3 Hg + adsorption were explored by varying environmental factors such as pH, contact time, and temperature. Furthermore, the introduction of sulfur significantly enhanced the adsorption capacity for CH 3 Hg + . Batch adsorption experiments demonstrate that LA-MIL-101 exhibits an exceptionally rapid adsorption rate, achieving over 88.3 % of the total removal rate within just one minute. Additionally, LA-MIL-101 shows remarkable adsorption efficacy across a broad pH range. The adsorption behavior of LA-MIL-101 for CH 3 Hg + aligns with the Elovich and Langmuir models, with a maximum adsorption capacity reaching 1391.77 μg·g −1 . LA-MIL-101 also displays a strong anti-interference capability in environments containing humic acid or Na + . Notably, it maintains high removal efficiency under conditions involving coexisting cations, as well as in simulated surface water, simulated groundwater, and natural seawater. Moreover, LA-MIL-101 demonstrates good stability and recyclability, retaining effective adsorption after five adsorption/desorption cycles. XPS results elucidate the adsorption mechanism of CH 3 Hg + , highlighting interactions with sulfur (S) and nitrogen (N) atoms. Overall, LA-MIL-101 exhibits high practicality and significant potential for application in the emergency treatment of CH 3 Hg + in aquatic environments.
研究领域:
环境科学
·
材料科学
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2016
·
IF 1.947
Li-Li Xi,Hong-Bing Ma,Guan-Hong Tao
CdSe/CdS quantum dots (QDs) functionalized by thiourea (TU) were synthesized and used as a fluorescent sensor for mercury ion detection. The TU-functionalized QDs were prepared by bonding TU via electrostatic interaction to the core/shell CdSe/CdS QDs after capping with thioglycolic acid (TGA). It was observed that the fluorescence of the functionalized QDs was quenched upon the addition of Hg 2+ . The quantitative detection of Hg 2+ with this fluorescent sensor could be conducted based on the linear relationship between the extent of quenching and the concentration of Hg 2+ added in the range of 1–300 μg L −1 . A detection limit of 0.56 μg L −1 was achieved. The sensor showed superior selectivity for Hg 2+ and was successfully applied to the determination of mercury in environmental samples with satisfactory results.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2017
·
IF 1.932
Hai-Mu Ye,Liu-Ting Hong,Yang Gao,Jun Xu
Herein, we demonstrated that poly(ethylene oxide) (PEO), urea and thiourea can crystallize into novel ternary complex with the molar ratio of guest polymer and host small molecule as 3:2, and proved that the ternary complex behaves isomorphism phenomenon by varying the ratio between urea and thiourea for the first time. This observation gives a boost to prepare co-crystals of different small molecules that cannot be obtained by direct mixing without the aid of polymer chains.
研究领域:
材料科学
·
高分子化学
·
晶体学
✓ 已验证
产品关联
DOI
高影响因子
Sustainability
·
2022
·Vol. 14
·期 22
·15290
·
IF 3.889
Jiaqi Bu,Lu Yuan,Hongru Jiang,Chongqing Wang
A novel adsorbent (GO-TOA) was prepared by condensation and self-assembly of graphene oxide (GO) and thiourea, and it was characterized systematically. The results revealed that thiourea has anchored on graphene oxide (GO) successfully. The results showed that GO-TOA had a higher adsorption capacity (641.724 mg/g) and adsorption rate (92.32%) than GO (196.8 mg/g and 65.6%), indicating that the introduction of thiourea greatly improved the adsorption capacity of GO. Adsorption kinetics, adsorption thermodynamics isotherm, and adsorption thermodynamics were used to study the adsorption mechanism. The results show that GO-TOA still has an adsorption rate of 90.44% compared with 0 cycles (92.32), indicating that GO-TOA has good activation and regeneration capacity. In addition, ethanol and dilute hydrochloric acid were used for the desorption of MB, and the effect of desorption was found very well. Through reusability experiments, we also found that GO-TOA has excellent application potential. We believe that GO-TOA will be a potential adsorbent for MB.Keywords:adsorbent;methylene blue;thiourea;graphene oxide;self-assembly
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）