WASTE MANAGEMENT
·
2021
·
IF 7.145
Huayi Chen,Xingjian Yang,Yonglin Liu,Xueming Lin,Jinjin Wang,Zhen Zhang,Na Li,Yongtao Li,Yulong Zhang
Waste chicken feathers are the ideal precursor for the production of low-cost N-enriched biochar. KOH-modified N-enriched biochar (KNB) containing 15.92 wt% N was successfully prepared using waste chicken feathers. The adsorption kinetics results showed that KNB had rapid Cd (2 h) and Pb (1 h) adsorption rates. The Cd and Pb adsorption capacities of KNB (the values of K F were 22.324 (Cd) and 119.654 (Pb) mg 1−(1/n) ·L 1/n ·g −1 ) were 7.07 and 26.52 times higher than those of the original biochar based on the adsorption isotherm results. The KNB was stable at pH 3–6 and had stronger co-adsorption capacities in double-ion systems. Based on the adsorption experiments and various characterization methods, we concluded that the primary Cd and Pb adsorption mechanisms of KNB involved electrostatic interactions, cation-π interactions, complexation, and K + exchange. The precipitation mechanism could partially account for Pb adsorption but not for Cd adsorption. KOH modification enhanced the electronegativity of biochar and then increased the electrostatic attraction. Surface O- and N-containing functional groups were involved in Cd and Pb adsorption. Graphitic-N, oxidised-N, and O C O were the main active adsorption groups, the relative contents of which increased after KOH modification, thus increasing the Cd and Pb adsorption performance. Therefore, KNB can be used as a fast and highly efficient adsorption agent to remove Cd and Pb from wastewater containing either Cd and Pb or a combination of these two metals.
研究领域:
环境科学
·
材料科学
·
废水处理
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Liping Wang,Xinyi Cao,Zaiqi Liu,Yuqiong Wang,Puxian Xiong,Wen Gao,Bo Tang
Exploring excellent near infrared-II (NIR-II) emitting materials is desirable for the advancement of high quality bioimaging, in virtue of the lower scattering, deep penetration and high sensitive of biological components in the second optical transmission window. Colloidal Ag 2 X (X = S, Se) nanocrystals exhibit tunable NIR photoluminescence in the second NIR region. However, the lack of highly efficient broadband NIR emitting Ag 2 X (X = S, Se) nanocrystals limits their spectroscopy applications. Herein, cadmium (Cd) doped Ag 2 X (X = S, Se) nanocrystals were prepared through a facile hydrothermal method at room temperature . The NIR luminescence was efficiently enhanced through controllable doping a little amount of Cd ions into the Ag 2 X (X = S, Se) quantum dots (QDs). Simultaneously, the great broadening of NIR emission was achieved in the Cd doped Ag 2 Se QDs, and the maximum full width at half maximum could reach up to 530 nm. Following the general principles of photoluminescence light-emitting diode (LED) devices, the fabricated NIR mini LEDs) light sources based on Cd doped Ag 2 Se QDs exhibited broadband NIR electroluminescence and superior optoelectronic stability, and were successfully employed for clear vessel imaging. The works proves the feasibility of NIR mini LEDs in non-invasive bioimaging, and paves way for the miniaturized broadband NIR light sources.
研究领域:
材料科学
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纳米技术
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生物医学工程
·
光电技术
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产品关联
DOI
高影响因子
Nanoscale
·
2023
·Vol. 15
·期 11
·5345-5359
·
IF 6.7
Pengpeng Li,Biao Zhao,Kai Pan,Jianping Deng
Chiroptical nanomaterials including chiralized advanced functional nanofibers have attracted ever-increasing interest in multi-disciplinary fields. Nowadays, electronic circular dichroism (CD) is the most widely used technique to evaluate chiral properties. Numerous studies have shown that the occurrence of linear dichroism and linear birefringence (LDLB) phenomenon in chiral micro-/nano-architectures makes it challenging to distinguish their inherent chiral information. However, tactfully combining LDLB with true circular dichroism (true CD) may lead to a new class of chiroptical materials. In this study, we demonstrate that transparent nanofibrous films infiltrated with poor solvents can show unique LDLB properties, which allows achiral nanofibrous films to exhibit these features regularly opposite Cotton signals by simply flipping the two faces of the same film or even rotating the testing angles of the sample around its optical axis in a single face. More importantly, we can quantitatively distinguish the contribution of LDLB from true CD in the chiral composite nanofibrous system and even effectively combine them into a single unity. This kind of adjustable flexible film material shows outstanding value in the field of optoelectronics. Its large intrinsic LDLB feature and angle-dependent, non-reciprocal transmission for polarized lights are exploited to fabricate programmable polarized light-emitting devices through the resin encapsulation process. This study may provide an easy and powerful way for the construction and implementation of novel polarization optical materials towards future intelligent optical encryption and advanced anti-counterfeiting devices.
研究领域:
纳米技术
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光学
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材料科学
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光子学
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化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Long-Qi Yang,Xiao-Ming Jiang,Shao-Min Pei,Wen-Fa Chen,Bin-Wen Liu,Guo-Cong Guo
Exploring new infrared nonlinear optical (IR NLO) materials with superior overall properties is scientifically and technically important. However, large second-order harmonic generation (SHG) efficiencies and high laser-induced damage thresholds (LIDT) are incompatible, which makes realizing this goal a challenge. The IR NLO performance of an A-NIIB-MIIIA-Q (Q: chalcogen) system was optimized by simultaneously modulating A/(M + N) and M/N ratios (A: alkali metal; N, M: tetra-coordinated metals), and SHG–LIDT balance was achieved. Three new sulfides, KCd3Ga5S11 (1), RbCd4Ga3S9 (2), and Cs2Cd2Ga8S15 (3), containing the same CdS4 and GaS4 but with different A/(Ga + Cd) and Ga/Cd ratios were obtained. Among these compounds, compound 3 exhibits both the largest SHG efficiency (0.5 × AgGaS2) and LIDT (35 × AgGaS2), which can be ascribed to the Ga/Cd modulation for enhancing the NLO functional motif distortions and SHG efficiency as well as the A/(Ga + Cd) modulation for enlarging the band gap and LIDT. Remarkably, compound 3 is the first phase-matchable IR NLO material in the A-NIIB-MIIIA-Q family. This article proposes a novel avenue to explore infrared nonlinear materials with superior comprehensive properties by modulating the A/(M + N) and M/N ratios.
研究领域:
材料科学
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光学
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产品关联
DOI
PubMed
高影响因子
Minerals
·
2021
·Vol. 11
·期 3
·243
·
IF 2.644
Hongfei Lu,Dongmei Qiao,Yang Han,Yulong Zhao,Fangfang Bai,Yadan Wang
The use of low molecular weight organic acids (LMWOAs) for the phytoremediation of heavy metals has become a promising technique. We chose five kinds of organic acids (oxalic acid (OA), acetic acid (AA), tartaric acid (TA), malic acid (MA), and citric acid (CA)) with six application rates (1, 2, 3, 4, 5, and 6 mmol/kg) and planted sunflowers (Helianthus annuusL.) in Cd-polluted soil to study the efficiency of the phytoremediation of Cd and the degree of Cd toxicity to plants. Treatment with no acid application served as the control (CK). We analyzed the plant height dry matter and the Cd and nonprotein sulfhydryl (NPT) contents in the soil and plant tissues. OA, AA, TA, MA, and CA increased plant heights by 17.6–47.40%, 21.25–39.17%, 12.5–35.52, 5.10–30.50%, and 16.15–49.17%, respectively; shoot biomass of the sunflowers was increased except with MA. NPT decreased under LMWOA application, which, in the roots, increased with the increase in root Cd under LMWOA treatment; however, there was no obvious relationship in the stems and leaves. The composition of Cd in the soil changed significantly under the LMWOA treatments compared to the CK, and the changes in carbonate Cd and Fe-Mn oxide Cd were the most prominent. The plant Cd accumulation of OA, AA, TA, MA, and CA increased by 43.31%, 55.25%, 48.69%, 0.52%, and 32.94%, respectively, and the increase in root Cd content and shoot dry matter quality promoted the increase in Cd accumulation. The LMWOAs were more likely to affect the phytoremediation of Cd by changing total P (TP) rather than total N (TN).
研究领域:
植物学
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环境科学
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DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2018
·Vol. 229
·期 4
·1-10
·
IF 1.769
Dai Ying,Lv Riwen,Huang Dejuan,Tao Qinqin
Humic acid (HA) plays an important role in the migration and transformation of uranium in natural waters. To effectively remove uranium in the presence of HA, a bifunctional polymer, diethylenetriaminepentaacetic acid cross-linked β -cyclodextrin (DTPA- β -CD), was synthesized by polycondensation reaction. The sorption performance of DTPA- β -CD in functions of pH, ionic strength, contact time, initial time, and temperature were explored batch wise. Experimental results showed that DTPA- β -CD could concurrently sorb uranium and HA around pH of 3.0. The sorption strongly depended on pH and on ionic strength, demonstrating outer-sphere surface complex in nature. Two sorption kinetics well followed pseudo-second-order model. Sorption isotherm accorded with Sips model. Increasing temperature facilitated uranium and restrained HA sorption. This work demonstrated that DTPA- β -CD was a promising material for sorbing uranium in the presence of HA.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Wanli Lian,Guanghui Yu,Jie Ma,Juan Xiong,Cuiyun Niu,Ran Zhang,Haijiao Xie,Liping Weng
Despite extensive study, geochemical modeling often fails to accurately predict lead (Pb) immobilization in environmental samples. This study employs the Charge Distribution MUlti-SIte Complexation (CD-MUSIC) model, X-ray absorption fine structure (XAFS), and density functional theory (DFT) to investigate mechanisms of phosphate (PO4) induced Pb immobilization on metal (hydr)oxides. The results reveal that PO4 mainly enhances bidentate-adsorbed Pb on goethite via electrostatic synergy at low PO4 concentrations. At relatively low pH (below 5.5) and elevated PO4 concentrations, the formation of the monodentate-O-sharing Pb-PO4 ternary structure on goethite becomes important. Precipitation of hydropyromorphite (Pb5(PO4)3OH) occurs at high pH and high concentrations of Pb and PO4, with an optimized log Ksp value of −82.02. The adjustment of log Ksp compared to that in the bulk solution allows for quantification of the overall Pb-PO4 precipitation enhanced by goethite. The CD-MUSIC model parameters for both the bidentate Pb complex and the monodentate-O-sharing Pb-PO4 ternary complex were optimized. The modeling results and parameters are further validated and specified with XAFS analysis and DFT calculations. This study provides quantitative molecular-level insights into the contributions of electrostatic enhancement, ternary complexation, and precipitation to phosphate-induced Pb immobilization on oxides, which will be helpful in resolving controversies regarding Pb distribution in environmental samples.
研究领域:
环境科学
·
地球化学
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产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Ji Zhang,Chenguang Yang,Yan Xu
Hierarchical electrochemical sensors with specific recognition function have been widely applied for trace amounts detection of metal ions, showing great significance for monitoring environmental quality. Herein, a novel flower-like ytterbium benzene-1,3,5-tricarboxylate metal-organic framework (Yb-MOF-1) was prepared by a one-step solvothermal method, which was then cast on a glassy carbon electrode to construct a sensing platform. Compared to the traditional rod-like Yb-MOF-2 prepared at a lower pH (pH = 4.26), the Yb-MOF-1 assembled from ultrathin nanosheets has a large surface area (462.356 m²/g), showing simultaneous electrochemical detection performance towards Cd 2+ , Pb 2+ and Cu 2+ in aqueous solution with detection limits of 9.22, 1.69, 15.15 nM, respectively. The experimental results demonstrate its good anti-interference and repeatability. The reliable practical application of Yb-MOF-1 for Cd 2+ , Pb 2+ and Cu 2+ detection in real water samples shows good recovery rates ranging from 95.8 % to 103.5 %, proving the effective strategy in exploring efficient electrochemical sensing materials.
研究领域:
环境科学
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材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Bo Huang,Meice Lu,Dali Wang,Yiheng Song,Li Zhou
In this paper, we report a facile approach to prepare magnetic gel based on the simultaneous formation of Fe 3 O 4 nanoparticles and crosslinking of natural peach gum polysaccharide . The obtained magnetic gel with porous structure, high specific surface area and numerous oxygen-containing functional groups exhibited fast and efficient adsorption capability towards Pb 2+ and Cd 2+ ions. The adsorption isotherms and kinetics presented good correlation with Langmuir isotherm and pseudo-second-order model, respectively. The maximum adsorption capacity of the magnetic gel for Pb 2+ and Cd 2+ ions can reach 277.0 and 141.4 mg g −1 , respectively, which is much higher than many other reported magnetic adsorbents. In addition, the magnetic gel can serve as a magnetic support for in situ growth of Pt nanocatalyst with high catalytic activity, as demonstrated by the reduction of 4-nitrophenol. Moreover, the magnetic gel exhibited excellent magnetic separation capability and superior reusability both for the adsorption and catalysis applications.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOM
·
2024
·Vol. 77
·期 2
·822-829
·
IF 2.1
Wu Xuelian,Wang Yaping,Xia Xinxin,Ding Jianxiang,Zhang Yundeng,Li Gege,Ma Chengjian,Pan Long,Wang Jinlong,Liu Dongming
Cd-based coatings are prone to spontaneous Cd whisker growth, raising safety concerns, particularly short-circuit risk. Although various environmental driving forces exist, the intrinsic factors affecting whisker growth have been overlooked. Herein, we investigate the growth mechanism of Cd nano-whiskers on the Ti 2 CdC MAX phase, a substrate material. Our results demonstrate that both the number and length of Cd nano-whiskers increase rapidly with rising cultivation temperatures. Furthermore, even after leaving the controlled temperature environment, the growth behavior of the whiskers continues to be influenced by the initial cultivation temperature. We speculate that this temperature dependency is related to the migration of atomized Cd, driven by the easily disrupted weak Ti-Cd bonds within the Ti 2 CdC structure. Additionally, due to the thermally activated nature of atomized Cd migration, Cd nano-whiskers grow rapidly on Ti 2 CdC. This work expands our understanding of Cd whisker growth by emphasizing the role of the chemical environment of Cd atoms in the substrate material, highlighting the significance of atomized Cd, and refining the growth mechanism of nano-whiskers involving atomized Cd.
研究领域:
材料科学
·
纳米技术
·
固态化学
·
表面科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
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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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 3
·2093-2101
·
IF 2.993
Wu Yanzi,Ma Yujie,Xu Guanhong,Xia Tianyi,Liu Wenxuan,Dong Zezhong,Yuan Qing,Zhang Cong,Hu Qin
Two novel porous metal–organic frameworks (MOFs) Cu(TCPBDA) and Cd(TCPBDA) based on a new ligand, namely N,N,N′,N′-tetrakis(4-carboxyphenyl)biphenyl-4,4′-diamine (H 4 TCPBDA), were synthesized by solvent thermal method and characterized with scanning electron microscopy, powder X-ray diffraction, BET analysis and spectrofluorometry. The static adsorption of the two MOFs for lead ions (Pb 2+ ) was investigated. Cu(TCPBDA) showed a higher adsorption capacity for Pb 2+ compared with Cd(TCPBDA), and its maximum adsorption capacity was 300 mg/g. The adsorption performance of Cu(TCPBDA) was then further studied. It was found that the adsorption of Cu(TCPBDA) for Pb 2+ fitted the Freundlich model and pseudo-second-order equation very well. The adsorption ability of Cu(TCPBDA) was applied to fast and efficient adsorption for Pb 2+ in toner. The results indicates that Cu(TCPBDA) is a promising material in adsorption and removal of heavy metal ions.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）