NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 21
·8315-8324
·
IF 3.069
Hui Yang,Rui Wang,Yaozu Wang,Jianzhong Jiang,Xingzhong Guo
Macroporous europium-doped Ca12Al14O33 (C12A7:Eu3+) was prepared via a sol–gel method followed by heat-treatment, and the crystal structure, luminescence performance and metal ion luminescence sensing of C12A7:Eu3+ were investigated and evaluated in detail. The process of the sol–gel method and heat-treatment promotes the formation of a single mayenite phase C12A7:Eu3+, and the Eu3+ ions are incorporated into the crystal lattice and replace the position of the Ca2+ ions without destroying the lattice structure of C12A7. The interconnected macropores not only increase the lighting area but also reduce the concentration quenching effect, leading to a significant enhance of luminescence intensity. The resultant macroporous C12A7:Eu3+ can be used as a luminescence performance sensor and displays the potential practical application for metal ion detection. The macroporous C12A7:Eu3+ sensor has a good response to Pb2+ ions, whose linear equation between concentration (CPb) and luminescence intensity (F) of (F0 − F)/F0 = 1.412 + 0.3428 log10(CPb) can be obtained.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 13
·15188-15197
·
IF 3.056
Dai Chaomeng,Zhou Hui,You Xueji,Duan Yanping,Tu Yaojen,Liu Shuguang,Zhou Feng,Hon Leong Kah
Transport of environmental pollutants in groundwater systems can be greatly influenced by colloids. In this study, the cotransport of Pb 2+ and silica (SiO 2 ) colloids at different Pb 2+ concentrations was systematically investigated by batch adsorption and saturated sand column experiments. Results showed that SiO 2 colloids had low adsorption capacity for Pb 2+ (less than 1% of the input) compared with sands. In saturated porous media, SiO 2 colloids showed a high mobility; however, with the increase of Pb 2+ concentration in the sand column, the mobility of SiO 2 colloids gradually decreased. Notably, SiO 2 colloids could facilitate Pb 2+ transport, although they did not serve as effective carriers of Pb 2+ . Under the condition of low Pb 2+ concentration, SiO 2 colloids promoted the Pb 2+ transport mainly through the way of “transport channel,” while changing the porosity of the medium and masking medium adsorption sites were the main mechanisms of SiO 2 colloid–facilitated Pb 2+ transport under the condition of high Pb 2+ concentration. The discovery of this non-adsorption effect of colloids would improve our understanding of colloid-facilitated Pb 2+ transport in saturated porous media, which provided new insights into the role of colloids, especially colloids with weak Pb 2+ adsorption capacity, in Pb 2+ occurrence and transport in soil-groundwater systems.
研究领域:
环境科学
·
地下水污染研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Xihui Shan,Yi Zhang,Xulong Lv,Yanjie Liang
Far ultraviolet-C (far-UVC; 200–230 nm) luminescent materials have garnered significant interest in recent years, driven by the growing demands for applications such as disinfection and solar-blind imaging due to their distinct wavelength features. However, the research and development of far-UVC persistent phosphors are lacking. Here, we report the realization of far-UVC persistent luminescence in CaSO4:Pr3+ and CaSO4:Pb2+ phosphors, which show emissions peaking at 220 nm and 230 nm with a long persistence time of >24 h after ceasing X-ray excitation. This is by far the shortest UVC afterglow emission to the best of our knowledge. The far-UVC afterglow from the charged phosphors can be readily detected by a solar-blind UV camera in both indoor-lighting and outdoor environments owing to the absence of background noise from ambient light. The continuous photostimulation of indoor white LED light and outdoor sunlight has different impact on the far-UVC afterglow performance of CaSO4:Pr3+ and CaSO4:Pb2+ phosphors, which is elucidated by the decay time-dependent thermoluminescence (TL) curves in different light conditions. This study expands the field of persistent luminescence to the far-UVC spectral region and will inspire the discovery of more excellent far-UVC persistent phosphors.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Huijin Li,Shuang Ding,Jie Yuan
Current research focuses on extracting humic acid (HA) compounds from low-rank coals to obtain high value-added products. In this study, HAs with high purity and low heavy metal content were obtained from lignite by combining acid pretreatment with hydrothermal treatment. Scanning electron microscopy, elemental analysis (EA), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction, and inductively coupled plasma optical emission spectrometry (ICP–OES) were used to analyze raw lignite and HAs. The effects of acid and hydrothermal treatments on the inorganic elements, functional groups, and yield of HAs were examined. The results showed that acid treatment reduced the ash content of lignite from 20 to 9%, and hydrothermal treatment increased the yield of HAs from 36 to 68%. The chemical properties of HAs exhibited an increase in molecular weight and improved aromaticity after acid and hydrothermal treatments. The results of ICP–OES analysis suggested that the combined method of acid and hydrothermal treatments resulted in a significant reduction of heavy metal elements in HAs. FTIR analysis confirmed the results and demonstrated that the extracted HA from nitric acid pretreated and hydrothermal generation of lignite PHA was rich in carboxyl and phenolic functional groups. PHA was applied to biochar as an activator for the adsorption of heavy metal ions. The experimental results showed that PHA was successfully loaded onto biochar and introduced a large number of functional groups, and the adsorption capacity of the modified biochar for Pb2+ was effectively improved.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2017
·Vol. 23
·期 42
·10092-10099
·
IF 5.317
Jing Zhang,Qing Tang,Zhong-Zheng Gao,Sheng-Chao Qiu,Ying Huang,Zhu Tao
Graphical Uniquely responsive : The interaction of thiazole orange (TO) with twisted cucurbit[14]uril ( t Q[14]) was investigated, and formation of a stable fluorescent t Q[14]/TO complex was observed. The t Q[14]/TO complex exhibited unique fluorescence responses to Hg 2+ , Ba 2+ , and Pb 2+ cations in different aqueous media (see figure). Thus, a fluorescent sensor for three heavy-metal ions was developed. A water-soluble fluorescent sensor based on the interaction of twisted cucurbit[14]uril ( t Q[14]) and thiazole orange (TO) in aqueous solution was developed. Formation of the t Q[14]/TO complex gives rise to stronger fluorescence in both neutral and acidic aqueous solutions compared with that of free TO. Further experiments on the interaction of the t Q[14]/TO complex with metal ions revealed that, from a series of nineteen selected common metal ions, 1) only Hg 2+ can lead to fluorescence enhancement and then quenching of the t Q[14]/TO (2:1) complex in neutral aqueous solution; 2) only Ba 2+ can induce fluorescence quenching of the t Q[14]/TO (2:1) complex in aqueous HCl solution (pH 2); furthermore, the t Q[14]/TO/Ba 2+ systems exhibit reversible changes in fluorescent intensity on successively adding SO 4 2− and Ba 2+ ; and 3) only Ba 2+ or Pb 2+ can induce fluorescence quenching of the t Q[14]/TO (15:1) complex in aqueous HCl solution (pH 2). Thus, the t Q[14]/TO complex can act as a supramolecular fluorescence-based sensor for the determination of Hg 2+ , Ba 2+ , and Pb 2+ ions.
研究领域:
化学
·
分析化学
·
超分子化学
✓ 已验证
DOI
PubMed
高影响因子
Minerals
·
2019
·Vol. 9
·期 8
·463
·
IF 2.25
Yuqing Huang,Wanzhong Yin,Rongdong Deng,Dingquan Xing,Feng Rao
The conventional sulfidation-xanthate flotation process that consists of sulfidization with sodium sulfide, activation by heavy-metal ions, and collection with xanthate is not sufficiently efficient for treating hemimorphite, and the dosages of the sulfurizing reagent and metal ions are large. In this study, the sulfidation flotation (Pb2++ Na2S + Pb2++ xanthate) of hemimorphite was strengthened by pretreating with Pb2+before sulfidation. Microflotation test results indicated that the recovery of hemimorphite increased by 5–10% after pretreatment with Pb2+. The comprehensive results of adsorption experiments, scanning electron microscopy–energy-dispersive X-ray spectroscopy, atomic force microscopy, and X-ray photoelectron spectroscopy indicated that a large amount of Pb2+was adsorbed on the hemimorphite surface and entered the lattice, forming Zn(4−x)PbxSi2O7(OH)2·H2O. The newly formed component had an increased amount of surface sulfidation active sites and had the effect of induced crystallization, making the surface more effective for sulfidation. After the Pb2+was added to the pulp, a large number of uniform and dense PbS species were formed on the hemimorphite surface, increasing the number of adsorption sites for xanthate and reducing the competitive adsorption of residual S2−on the xanthate.Keywords:hemimorphite;flotation;strengthening sulfidation;pretreatment;lead ion
研究领域:
矿物加工工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2024
·
IF 7.5
Zhaoxuan Huang,Nan Tian,Shiyu Duan,Jicheng Zhang,Disheng Yao,Guoyuan Zheng,Yanhan Yang,Bing Zhou
Nickel oxide (NiOX) is an ideal inorganic hole transport material for the fabrication of inverted perovskite solar cells owing to its excellent optical and semiconductor properties. Currently, the main research on developing the performance of NiOX-based perovskite solar cells focuses on improving the conductivity of NiOX thin films and preventing the redox reactions between metal cations (Ni3+ on the surface of NiOX) and organic cations (FA+ or MA+ in the perovskite precursors) at the NiOX/perovskite interface. In this study, a new type of interface defects in NiOX-based CsPbI2Br solar cells is reported. That is the Pb2+ from CsPbI2Br perovskites can diffuse into the lattice of NiOX surface as the annealing temperature of perovskites changes. The diffusion of Pb2+ increases the ratio of Ni3+/Ni2+ on the surface of NiOX, leading to an increase in the density of trap state at the interface between NiOX and perovskites, which eventually results in a serious decline in the photovoltaic performance of solar cells.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2013
·
IF 4.593
Lingyun Dong,Shilie Pan,Ying Wang,Hongwei Yu,Xiaoyu Dong,Shujuan Han,Min Zhang
The structures of two new lead-containing oxyborate bromines, Pb2(O4Pb8)(BO3)3Br3 (1) and Pb2(O8Pb12)(BO3)2Br6 (2), are determined by single-crystal X-ray diffraction for the first time. Both of them crystallize in the space group C2/c of the monoclinic crystal system. Although the two compounds have the same type of fundmental building units (FBUs), the OPb4 anion-centered tetrahedra and BO3 triangles, they exhibit different connection modes. Compound 1 consists of single ∞1[OPb2] chains, while compound 2 possesses ∞1[O2Pb3] ribbons. Interestingly, large Br atoms profoundly influence the conformation of polyions based on the OPb4 anion-centered tetrahedra, resulting in single ∞1[OPb2] chains linked up by finite zweier chains with four OPb4 tetrahedra via the opposite edges in compound 1 and ∞1[O2Pb3] ribbons with sequential condensation of OPb2 chains in compound 2. A detailed description of the effect of large Br atoms on the conformation of polyions is discussed. IR spectroscopy, UV–vis–NIR diffuse reflectance spectroscopy, and thermal analysis are also performed on the reported materials.
研究领域:
材料化学
·
晶体学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Science
·
2023
·Vol. 10
·期 13
·2207630
·
IF 15.1
Wen-Fa Chen,Bin-Wen Liu,Shao-Min Pei,Xiao-Ming Jiang,Guo-Cong Guo
In contrast to anionic group theory of nonlinear optical (NLO) materials that second-harmonic generation (SHG) responses mainly originate from anionic groups, structural regulation on the cationic groups of salt-inclusion chalcogenides (SICs) is performed to make them also contribute to the NLO effects. Herein, the stereochemically active lone–electron-pair Pb 2+ cation is first introduced to the cationic groups of NLO SICs, and the resultant [K 2 PbX][Ga 7 S 12 ] (X = Cl, Br, I) are isolated via solid-state method. The features of their three-dimensional structures comprise highly oriented [Ga 7 S 12 ] 3− and [K 2 PbX] 3+ frameworks derived from AgGaS 2 , which display the largest phase-matching SHG intensities (2.5−2.7 × AgGaS 2 @1800 nm) among all SICs. Concurrently, three compounds manifest band gap values of 2.54, 2.49, and 2.41 eV (exceeding the criterion of 2.33 eV), which can avoid two-photon absorption under the fundamental laser of 1064 nm, along with the relatively low anisotropy of thermal expansion coefficients, leading to improved laser-induced damage thresholds (LIDTs) values of 2.3, 3.8, and 4.0 times that of AgGaS 2 . In addition, the density of states and SHG coefficient calculations demonstrate that the Pb 2+ cations narrow the band gaps and benefit SHG responses.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yaqin Rong,Wenjun Yan,Zhongde Wang,Xiaogang Hao,Guoqing Guan
The slow accumulation of heavy metal in the sediment and aquatic food chain, leads to extremely bad health influence in human body. Most of the traditional adsorption materials have deficient adsorption capacity and selectivity. In this research, the TiO 2 /PANI composite material is synthesized successfully by intercalating 2HT (intercalating agent) and PANI into the interlayer of the TiO 2 nanosheet for the separation of Pb 2+ . During this synthesis process, the layer spacing of TiO 2 /PANI can be controlled precisely by adjusting the concentration of 2HT and PANI. The rapid Pb 2+ uptake/ release process is triggered through turning the redox states of composite film which can leads to the conversion between Ti 4+ and Ti 3+ and the conversion between –OH and -O-Pb covalent bond for maintaining the electrical neutrality. In addition, the directional H + proton migration, fast electronic transporting network and superfast Pb 2+ ion transport path both are benefit for the transmission and uptake of Pb 2+ . As a result, this composite film illustrates ultrahigh uptake capacity (1499.99 mg∙g −1 ) and selectivity (K D = 15.2 L·g −1 ). It can even treat real wastewater to a level lower than WHO. Hence, this composite film with superior electrochemical performance is a promising material, which could be used for uptake/release of Pb 2+ .
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
CARBON
·
2018
·
IF 7.082
Junxing Hao,Liudi Ji,Kangbing Wu,Nianjun Yang
To explore electrochemistry of the composites of ZnO and reduced graphene oxides (rGO), graphene oxide (GO) was in-situ reduced with Zn powders. The morphology and micro-structure of synthesized ZnO@rGO composites were characterized using scanning electron microscopy, transmission electron microscopy , and atomic force microscope . Energy dispersive spectroscopy, X-ray diffraction, Raman, and Fourier Transform infrared spectroscopy were employed to clarify the chemical composition of ZnO@rGO composites. Electrochemical properties of ZnO@rGO composites were studied using cyclic voltammetry and impedance, revealing a large surface area and many active sites. Accordingly, electrochemical sensing of a neutral organic dye Sudan I and a charged metal ion Pb 2+ was achieved on ZnO@rGO composites. The strategy of in-situ reduction of GO with Zn powders thus owns great application prospects in constructing a universal and sensitive electrochemical sensing platform.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Biobased Materials and Bioenergy
·
2018
·Vol. 12
·期 3
·266-270
·
IF 2.993
Wang Lijun,You Qianqian,Yao Shuangquan,Zhu Hongxiang,Li Xiaokun,Weng Mengling
In this study, the adsorption effect of Pb2+ and Cd2+ was investigated using amphoteric modified bagasse hemicellulose as adsorbent. The heavy metal ions adsorbed increased slowly after 30 min, and remained stable after 180 min. Application of level-2 dynamic model
describing the amphoteric modified bagasse hemicelluloses gave the adsorption capacity of lead and cadmium were at 65.79 mg · g–1 and 36.23 mg · g–1, respectively. At the temperature of 293 K, the pseudo-second-order dynamics equations for the
adsorption of Pb2+ and Cd2+ were as follows: dqt/dt = 0.0231(65.79–qt
)2, dqt/dt = 0.0428(36.23–qt
)2. Ion coexisting experiments showed that the affinity of Pb2+
was much higher than that of Cd2+.
研究领域:
环境科学
·
生物化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）