查找使用阿拉丁产品的科研文献

Na6MQ4 (M=Zn, Cd; Q=S, Se): Promising New Ternary Infrared Nonlinear Optical Materials

Yi Huang,Le Gao,HaoHai Yu,Zhihua Yang,Junjie Li,Shilie Pan

Graphical Laser damage limitation : Promising ternary infrared nonlinear optical (NLO) materials, Na 6 MQ 4 (M=Zn, Cd; Q=S, Se), with unique [NaQ 4 ] NLO-active groups, are successfully prepared. Theoretical calculations and statistical analyses indicate that the second-harmonic generation effect and band gap in the compounds originate mainly from the distorted NaQ 4 NLO-active units with a short Na−S bond length. Four sodium-based ternary IR nonlinear optical (NLO) materials, Na 6 MQ 4 (M=Zn, Cd; Q=S, Se), were prepared through a high-temperature flux method. The crystal structure of the compounds is built up of isolated [MQ 4 ] tetrahedra and a 3D framework formed by the NaQ n ( n =4, 5) units. The two selenides, Na 6 MSe 4 (M=Zn, Cd), as promising IR NLO materials, show moderate second-harmonic generation (SHG) responses (0.9 and 0.5×AgGaS 2 ) with good phase-matching behavior, as well as high laser damage thresholds (2 and 1.9×AgGaS 2 ). The two sulfides, Na 6 MS 4 (M=Zn, Cd), exhibit higher laser damage thresholds (13 and 4×AgGaS 2 ), but smaller SHG responses (0.3 and 0.2×AgGaS 2 ). Theoretical calculations and statistical analyses indicate that the SHG effect and band gap in the compounds originate mainly from the distorted NaQ 4 NLO-active units with a short Na−S bond length, which provides a new insight into the design of novel IR NLO materials.

Preparation, characterization and adsorption characteristics of diatom-based Cd(II) surface ion-imprinted polymer

Lili Huang,Lanqing Wang,Liang Gong,Qinglin Xie,Nanchun Chen

Cd(II)-based metal–organic framework-derived CdS photocatalysts for enhancement of photocatalytic activity

Ma Ligang,Ai Xiaoqian,Yang Xingming,Cao Xiaoxiao,Han Dianrong,Song Xiang,Jiang Huilin,Yang Wei,Yan Senlin,Wu Xiaoshan

CdS with band gaps of 2.4 eV is an essential semiconductor for optoelectronic and photocatalytic devices. In this study, Cd(II)-based metal–organic framework (MOF)-derived CdS photocatalysts are successfully synthesized using a facile chemical bath deposition method. CdS precursors are derived from Cd-based MOFs that H 2 S gas was bubbled into as S source. Four kinds of CdS nano-photocatalyst are obtained through controlling the thermal annealing process of CdS precursors. The excellent photocatalytic performance of CdS and the benefits of the porous and molecular sieving properties of MOFs are well integrated. The evolution of the morphology, microstructure, and optical properties are investigated by various characterization methods. The results indicate that the sample with an annealing temperature of 500 °C is primarily nanosheet structures with sizes ranging from 20 to 30 nm, which construct a porous network structure, Moreover, the best photodegradation activity is obtained by illuminating the catalyst in rhodamine-B dye solution for 80 min and reducing the absorption intensity to nearly zero. Finally, the pollutant degradation mechanism was analyzed in detail.

A novel technique for Cd removal from soil based on alginate-derived floatable spheres

Tian Hu,Wen-Zhao Chen,Huaitian Bu,Wei-Xiong Li,Zeng-Lin Li,Bu-Ning Liu,Ling-Min Lan,Chuigen Guo,Qingwen Wang,Gang-Biao Jiang

This paper proposes a fast, facile and eco-friendly strategy for removing Cd from soil. By combining two types of floatable alginate-derived multifunctional spheres: magnetic hollow carbon composite (MHCC) and calcium alginate aerogel (CAA) spheres, the fixed state Cd in soil is activated and removed sequentially. MHCC spheres activate and desorb the solid phase anchored Cd into mobile Cd 2+ ions, and CAA spheres effectively absorb the free Cd 2+ ions from the liquid phase via the massive absorption sites of carboxy and hydroxy groups. The remediation results of 5-round successive MHCC-CAA treatments (1.5 g MHCC-0.45 g CAA in 60 g soil) show that 44.02% of Cd is removed from the soil. MHCC spheres demonstrate excellent recyclability of 88.87 and 94.45% in flooding and non-flooding soil, respectively. The texture, cation exchange capacity (CEC) and pH value of the remediated soil suggest that the MHCC-CAA system has little interference on the soil properties. No remarkable hindrance of microbial growth by MHCC or CAA spheres is observed in the eco-toxicological test, indicating the ecological friendliness of MHCC-CAA remediation system.

Effects of different metal ions (Ca, Cu, Pb, Cd) on formation of cyanobacterial blooms

Peng Gu,Qi Li,Weizhen Zhang,Zheng Zheng,Xingzhang Luo

Eastern China is a typical region that suffers from harmful cyanobacterial blooms. Numerous studies have focused on bloom formation mechanisms; however, the detailed mechanisms remained unclear. Our study explored the influence of four metal ions (Ca, Cu, Pb and Cd) on Microcystis aeruginosa to determine their effects on bloom formation. We found that Ca concentrations higher than 100 mg L −1 contributed to cyanobacterial bloom formation. The presence of Ca triggered the anti-oxidation process and promoted the secretion of extracellular polysaccharides , thus inducing aggregation of algal cells and enhancing their buoyancy 2.1-fold more than the control ( p ＜0.05). The reverse regulation of dissolved CO 2 to bicarbonate by carbonic anhydrase formed a large amount of carbonate and decreased the growth rate by 38–56%. Cu (>0.1 mg L −1 ) presented significant toxicity to algal cells while Pb (>1 mg L −1 ) suppressed the algal growth rate due to the acidic condition. Cd (<0.1 mg L −1 ) exhibited no apparent toxicity to the algae. Furthermore, as the buoyancy increased, Cd was likely to facilitate the formation of cyanobacterial blooms, which needs further research. These findings can provide a theoretical basis for eutrophic lake management and contribute to the development of water quality and wastewater discharge standards.

A recyclable AChE-nanoprobe based on nano-Fe3O4@CHO-β-CD for trichlorfon detection

Jianfang Jiang,Kuaqian Deng,Fanglin Dao,Panyang Li,Jiali Huang

Trichlorfon (TCF) is an important chemical for pest and parasite control, but it poses risks to public and environmental health. Thus, the detection of TCF is of great value. In this study, we report a strategy to prepare an AChE-nanoprobe for detecting TCF. Benefiting from the unique and excellent structure of CHO-β-CD, this AChE-nanoprobe can wrap nano-Fe 3 O 4 and covalently bind AChE. As a proof of concept, we prepared an AChE-nanoprobe with a hydrated particle size of 717 nm and a saturation magnetic strength of 64.11 emu/g Fe. The properties were studied in detail. Its catalytic activity was 90 % of that of free AChE, and it had broadened pH, thermal, organic solvents and storage in addition to good reusability, with a residual catalytic activity of 42 % after the 10th cycle and a cumulative catalytic activity 6.9 times higher than that of the free enzyme. The AChE-nanoprobe exhibited good performance in TCF detection; the linear range of TCF was 40–4000 ng/L, and the limit of detection for TCF was 2.8 ng/L. Furthermore, our results suggest that the AChE-nanoprobe has several attractive features, such as easy preparation, outstanding stability and reusability, providing a novel and promising tool for the analysis of TCF.

Dielectrophoresis-assisted removal of Cd and Cu heavy metal ions by using Chlorella microalgae

Kai Zhao,Xun Zhao,Tianbo Gao,Xuan Li,Guanqi Wang,Xinxiang Pan,Junsheng Wang

A novel dielectrophoresis (DEP)-assisted device for the bioremediation of heavy metal ions by using Chlorella microalgae is presented in this paper. To generate the DEP forces, pairs of electrode mesh were inserted in the DEP-assisted device. By applying DC electric field via the electrodes, the inhomogeneous electric field gradient is induced and the strongest non-uniform electric field exists near the mesh cross-corner. After the adsorption of Cd and Cu heavy metal ions by Chlorella , the Chlorella chain were trapped along the vicinity of the electrode mesh. Then, the effects of Chlorella concentration on the adsorption of heavy metal ions, and the applied voltage and electrode mesh size on the removal of Chlorella are conducted. In the co-existing Cd and Cu solutions, the individual adsorption ratio of Cd and Cu reaches as high as approximately 96% and 98%, respectively, showing excellent bioremediation capability of multiple heavy metal ions in wastewater. By adjusting the applied electric voltage and the mesh size, the Chlorella adsorbed with Cd and Cu are captured by negative DC-DEP effects and the removal ratio of Chlorella reach an average of 97%, providing a method for the removal of multiple heavy metal ions in wastewater by using Chlorella microalgae.

Boosted capture of trace Cd(II) with a magnetic dual metal-organic-framework adsorbent

Jiehong Chen,Yan Li,Gangfeng Liang,Na Ma,Wei Dai

The microcrystalline powders of metal-organic frameworks (MOFs) are usually difficult to be separated and reused, restricting their applications for cadmium ions (Cd(II)) removal from water. Thus, it is imperative to develop the magnetic adsorbents with high adsorption performances and excellent recoverability. Herein, a novel type of magnetic dual MOFs composite for Cd(II) capture has been successfully synthesized with (ZIF-67)-on-(PMA@MIL-125-NH 2 ) as the adsorption mainstay and Fe 3 O 4 nanoparticle as the magnetic component. The advantages of the combination and its synergistic effect are achieved through the self-assembly process. Owing to the associate effect of abundant adsorption sites and high porosity, (ZIF-67)-on-(PMA@MIL-125-NH 2 @Fe 3 O 4 ) exhibits a significant adsorption capacity (152 ​mg ​g −1 ) and rapid adsorption rate (20 ​min) towards Cd(II). The adsorption data are well fitted by the Freundlich and pseudo-second-order kinetic models. The adsorption mechanism involves the critical contributions of π-π interaction, Lewis's acid-base, surface adsorption, electrostatic attraction, etc. Moreover, the adsorbent could be easy obtained from liquid through Fe 3 O 4 magnetism , exhibiting a good reusability. This work provides a new perspective on the synthesis of high-efficiency adsorbents for the Cd(II) capture from water.

Bacterial activation level determines Cd(II) immobilization efficiency by calcium-phosphate minerals in soil

Yonghui Xing,Wenjing He,Changshui Cai,Song Liu,Yi Jiang,Shuxin Tan,Chenchen Qu,Xiuli Hao,Peng Cai,Qiaoyun Huang,Wenli Chen

Soil mineral properties significantly influence the mobility of Cd(II) within the soil matrix. However, the limited understanding of how microbial metabolism affects mineral structure at the microscale poses challenges for in situ remediation. Here, we designed a model calcium-phosphate system in a urea-rich environment to explore the impact of different microbial activation levels on Cd(II) fixation at mineral interfaces. Findings indicate that bacteria affected the morphological structure of the minerals and the amount of carbonate incorporation (average 5.4 %), thereby enhancing Cd(II) immobilization capacity (up to 9.6 times). This process is influenced by the intensity of bacterial activation, as reflected in their urease activity. Extracellular substances secreted by bacteria are also essential for activating minerals, contributing to a sustained decrease in their surface potential. The introduction of activated minerals in potting experiments markedly stimulated the soil urease activity, promoting the enrichment of functional bacteria and facilitating Cd(II) passivation, thereby reducing Cd(II) uptake by vegetables. An extensive soil survey further corroborated a linkage between soil total phosphorus and urease activity, indirectly emphasizing the universality of phosphate mineral-urease microbial interactions and their critical role in the morphological transformation of Cd(II). Our findings highlight the functional dynamics of urease microorganisms in shaping soil mineral landscapes and regulating heavy metal mobility, with broad implications for soil microscale remediation strategies.

Application of Bi/PEDOT composite modified electrode in high-performance Cd (II) detection sensor

Lin Yang,Yijing Ai,Shihui Xu,Lisi Wang,Xiaoping Zhang,Wei Sun

In this paper, Bismuth/poly(3,4-ethylenedioxythiophene) (Bi/PEDOT) modified electrochemical modified electrodes were prepared by electrochemical deposition method, and the electrochemical performance of the electrode was investigated using cyclic voltammetry under the optimal experimental conditions. The PEDOT polymer has high conductivity, and bismuth can form an alloy with cadmium ions. Bi/PEDOT nanocomposite materials have a larger specific surface area and more active sites, which is more conducive to absorbing more cadmium ions (Cd 2+ ). The Differential pulse anodic stripping voltammetry method was used to study the electroanalytical performance of the sensor for Cd 2+ . The data show that the oxidation peak current of cadmium ions in the Bi/PEDOT modified electrode is significantly higher than that of other electrodes, due to the synergistic effect of the composite conductive materials. In the concentration range of 1 nM-40 μM, the concentration of cadmium ions shows a good linear relationship with the peak current, and the lowest detection limit is 0.33 nM. In addition, the sensor also exhibits good stability, reproducibility and very low detection limit, which can be used for rapid determination of trace cadmium ions, with a recovery rate in actual sample analysis of 101.4 %-104.0 %.

Bamboo-derived porous bioadsorbents and their adsorption of Cd(II) from mixed aqueous solutions

Xiao-kun OuYang,Ru-Na Jin,Le-Ping Yang,Yang-Guang Wang,Li-Ye Yang

Two porous bioadsorbents were successfully prepared from the partial enzymatic hydrolysis of bamboo and subsequent chemical modification with succinic anhydride. We investigated the abilities of the partially enzymatically hydrolyzed bamboo (PEB) and the porous succinylated bamboo (PSB) to adsorb Cd(II) from a solution containing sodium chloride and an amino acid. The partial enzymatic hydrolysis created many pores within the raw bamboo, and both the porous structure and the post-succinylation carboxyl group content were important for high adsorption capacity. The presence of sodium chloride and the amino acid markedly decreased the adsorption capacities of the bioadsorbents. The experimental data could be described perfectly with the Langmuir adsorption isotherm model and pseudo second-order kinetics model. Even in solutions containing sodium chloride and arginine, the maximum Cd(II) adsorption capacities at 303 K were 38.18 and 120.34 mg g−1 for PEB and PSB, respectively.

High-Performance Proton Field-Effect Transistor Based on Two-Dimensional Cd Vacancy-Resided Cd0.85PS3Li0.15H0.15

Wenhao Shi,Xitang Qian,Chuankai Zou,Meng Zhang,Chenhui Huang,Xiangshui Miao,Lei Ye

Ion transport is a critical phenomenon underpinning numerous biological, physical, and chemical systems. Proton transistors leveraging proton transport face significant limitations, such as a low on–off ratio and deficient carrier mobility, which restrict their applicability in biological and other scenarios. This study explores the use of two-dimensional (2D) vacancy-residing transition metal phosphorus trichallcogenide-based membranes as the active layer for proton field-effect transistors. The synthesized Cd0.85PS3Li0.15H0.15 membrane exhibits a well-organized layered structure and high hydrophilicity, with nanometer-sized interlayers containing interconnected water networks. These distinct features facilitate proton conduction, leading to a high proton conductivity value of 0.83 S cm–1 at 98% relative humidity and 90 °C, with an activation energy of 0.26 eV. The Cd0.85PS3Li0.15H0.15-based proton transistor demonstrates tunability via gate voltage, thereby enabling effective modulation of proton flow across source and drain electrodes. The transistor notably showcases superior switching characteristics, with an on/off ratio surpassing 5.51 and a carrier mobility of 8.84 × 10–2 cm2 V–1 s–1. The underlying mechanism for this performance enhancement is attributed to electric-field-induced switching in Cd vacancies. This research boosts the development of highly versatile ionotropic devices by introducing advanced 2D ion-conductive membranes.