JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2011
·Vol. 16
·期 2
·449-456
·
IF 2.234
Han Ruixia,Cui Lin,Ai Shiyun,Yin Huanshun,Liu Xianggang,Qiu Yanyan
A tyrosinase (Tyr) biosensor has been constructed by immobilizing tyrosinase on the surface of Mg–Al–CO 3 hydrotalcite-like compound film (HTLc) modified glassy carbon electrode (GCE) for the determination of polyphenols. The negatively charged tyrosinase was adsorbed firmly on the surface of a positively charged HTLc/GCE by electrostatic interactions and retained its activity to a great degree. The modified electrode was characterized by cyclic voltammetry and AC impedance spectra. Polyphenols were determined by a direct reduction of biocatalytically generated quinone species. The different parameters, including pH, temperature, and enzyme loading were investigated and optimized. Under the optimum conditions, Tyr/HTLc electrode gave a linear response range of 3–300, 0.888–444, and 0.066–396 μM with a detection limit (S/N = 3) of 0.1, 0.05, and 0.003 μM for catechol, caffeic acid, and quercetin, respectively. In addition, the repeatability and stability of the enzyme electrode were estimated. Total polyphenol contents of real samples were also determined to study the potential applicability of the Tyr/HTLc/GCE biosensor.
研究领域:
生物传感器
·
酶学分析
·
电化学检测
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 38
·21084-21091
·
IF 2.936
D. Zhang,X. Y. Liu,H. T. Zhao,L. Yang,T. Lü,M. Q. Jin
Radioactive iodine is quite mobile in soil and poses threats to human health and the ecosystem. Many materials, including layered double hydroxides (LDH), have been synthesized to successfully capture iodine from aqueous environments. However, limited information is available on the application of LDH in soil to immobilize iodine species. In the present study, the feasibility of using Mg–Al–NO3 LDH for retention of soil iodate (IO3−) in both batch and column systems was analyzed. The 2 : 1 Mg–Al–NO3 LDH exhibited the greatest removal efficiency of IO3− from aqueous solution, compared with 3 : 1 and 4 : 1 Mg–Al–NO3 LDH. The Mg2–Al–NO3 LDH demonstrated a strong affinity for IO3−, with a high sorption capacity of 149 528 mg kg−1 and a Freundlich affinity constant KF of 21 380 L kg−1. The addition of Mg2–Al–NO3 LDH in soil resulted in significant retention of IO3− in both the batch and column experiments. The affinity parameter KF of soil with the addition of 1.33% Mg2–Al–NO3 LDH was 136 L kg−1, which was 28.6 times higher than soil without LDH added. Moreover, the eluted iodate percentage was only 12.9% in the soil column with the 1.33% Mg2–Al–NO3 LDH addition, whereas almost 43.5% iodate was washed out in the soil column without LDH addition. The results suggested that Mg2–Al–NO3 LDH could effectively immobilize iodate in soil without obvious interference.
研究领域:
环境科学
·
放射性污染控制
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·
IF 1.5
Lu Sen,Yin Yuqiang,Bao Jiacheng,Wang Hongqiang,Lei Zhiwu,Hu Eming,Xin Qi,Quan Yihao,Wang Qingliang
In this study, tin sulphide (SnS 2 ) and nickel–chromium hydrotalcite (NiCr-LDH) complexes (SnS 2 /NiCr-LDH) were used for the simultaneous removal of U(VI) and humic acid (HA) from U(VI)-containing wastewater. The results showed that the adsorption of HA by the SnS 2 /NiCr-LDH was greatly enhanced, which was 4.07 and 2.94 times higher than that of pure SnS 2 and NiCr-LDH, respectively, and the highest U(VI) adsorption quantity over SnS 2 /NiCr-LDH increased from 127.81 to 446.68 mg g −1 when HA was present. Density functional theory (DFT) calculations revealed that the enhanced U(VI) adsorption on SnS 2 /NiCr-LDH was facilitated by the formation of a robust inner-sphere surface complex between U(VI) and HA.
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
GREEN CHEMISTRY
·
2021
·Vol. 23
·期 12
·4560-4566
·
IF 10.182
Yunhao Gao,Zhiyuan Zhou,Xi Chen,Yuyang Tian,Yan Li,Huachen Wang,Xuan Li,Xueyang Yu,Yongsong Cao
Volatilization and leaching are two critical pathways for pesticide transportation from their applied areas to non-target regions. Nanocarrier-based formulations can improve the use efficiency and reduce the off-target effects of pesticides, however, the complicated preparation process seriously restricts the large-scale application of nanopesticides in the agricultural field. In this work, taking 2-(2,4-dichlorophenoxy) acetic acid (2,4-D), 2-methyl-4-chlorophenoxyacetic acid (MCPA), and 3,5-dibromo-4-hydroxybenzonitrile (bromoxynil) as model herbicides, herbicide-intercalated Zn–Al hydrotalcites (herbicide@HTlcs) were facilely fabricated by a modified co-precipitation method without heating, aging, organic solvents, and inert gas. The obtained herbicide@HTlcs showed high entrapment efficiencies (71.7%–86.7%), a sheet structure with an average size of 339.4 nm, and positive surface charges (+40.5). The volatilities of herbicide@HTlcs were reduced more than 3-fold compared with those of pure herbicides. The release rates of 2,4-D@HTlcs were in line with the selectivity sequence of HTlcs for the anions and controlled by non-Fickian diffusion. The leaching experiments performed in two agricultural topsoils collected from Beijing and Yunnan province and a grassland soil from Neimenggu province all demonstrated that the developed 2,4-D@HTlc nanosheets could evidently retard 2,4-D leaching through the soil. Additionally, 2,4-D@HTlcs exhibited no delay in the control efficacy against Amaranthus retroflexus compared with free 2,4-D sodium salt. This study provides a novel insight into the facile fabrication of controlled release formulations of pesticides that can reduce the volatilization and leaching risks simultaneously.
研究领域:
农业科学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Science Bulletin
·
2019
·
IF 6.277
Junbo Zhang,Xiaolin Li,Ming Xu,Yusen Yang,Yinwen Li,Ning Liu,Xiaoyu Meng,Lifang Chen,Shuxian Shi,Min Wei
Glycerol (GLY) aerobic oxidation in an aqueous solution is one of the most prospective pathways in biomass transformation, where the supported catalysts based on noble metals (mainly Au, Pd, Pt) are most commonly employed. Herein, Pt nanoparticles supported on rehydrated Mg x Al 1 -hydrotalcite (denoted as re-Mg x Al 1 -LDH-Pt) were prepared via impregnation-reduction method followed by an in situ rehydration process, which showed high activity and selectivity towards GLY oxidation to produce glyceric acid (GLYA) at room temperature. The metal-support interfacial structure and catalyst basicity were modulated by changing the Mg/Al molar ratio of the hydrotalcite precursor, and the optimal performance was achieved on re-Mg 6 Al 1 -LDH-Pt with a GLY conversion of 87.6% and a GLYA yield of 58.6%, which exceeded the traditional activated carbon and oxide supports. A combinative study on structural characterizations (XANES, CO-FTIR spectra, and benzoic acid titration) proves that a higher Mg/Al molar ratio promotes the formation of positively charged Pt δ + species at metal-support interface, which accelerates bond cleavage of α-C–H and improves catalytic activity. Moreover, a higher Mg/Al molar ratio provides a stronger basicity of support that contributes to the oxidation of terminal-hydroxyl and thus enhances the selectivity of GLYA. This catalyst with tunable metal-support interaction shows prospective applications toward transformation of biomass-based polyols.
研究领域:
化学工程
·
催化科学
·
生物质转化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Chunhao Wang,Xiang Xu,Yang Guo,Fan Zhou,Hongyu Chen,Haoyang Li,Zheng Zeng,Liqing Li
The cobalt carbide (Co2C) innovatively prepared from Co–Mn layered double hydroxide (CoMn LDH) has been investigated and evaluated toward its alternative synthesis conditions and different catalytic performances. Along with various characterization techniques, the preparation basically contains four steps (synthesis of CoMn LDH, calcination, reduction, and crystallization) that transform CoMn LDH to CoMn spinel and then to Co2C. Catalyst evaluation toward toluene pyrolysis was conducted. The sample with Co2C exhibited almost 100% conversion rate of toluene, where the resulting hydrogen yield (∼1.8%) is 6 times more than that of the blank test by using silica sand (∼0.3%), realizing the full transfer of hydrogen element from toluene to hydrogen molecule. Furthermore, based on the textural analysis and density functional dispersion correction calculation, which theoretically explained the easy accessibility of toluene to the crystal surface of Co2C(001) with a relatively high adsorption energy (about −280 kJ mol–1), it suggested that Co2C may expand more extensive applications in the field of catalysis.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Pan Miao,Yuxuan Deng,Chen Wang,Rongqin Chen,Jiayu Ma,Dongshen He,Junfeng Zhou
In this study, magnesium-aluminum layered double hydroxides (LDHs-MgAl) were controllable synthesized via coprecipitation and calcined at 400°C (LDHs-400-MgAl) for adsorption of glyphosate (Gly) from wastewater. The experiments showed that LDHs-400-MgAl exhibits outstanding adsorption capacities and stability within the range of pH 3.0 to 10.0. Particularly, LDHs-400-MgAl displayed excellent equilibrium and maximum adsorption capacities, measuring 192.31 mg/g and 259.85 mg/g respectively at 25°C compared with other adsorbents. Importantly, even in solutions containing diverse anions such as NO - 3 , CO 2- 3 , SO 2- 4 , and Cl - with concentrations as high as 0.1 mol/L, LDHs-400-MgAl exhibited exceptional anti-interference capability. Moreover, the adsorption process of Gly with LDHs-400-MgAl is in accordance with the pseudo-second-order kinetic model and Langmuir model, simultaneously showing the spontaneous and endothermic thermodynamics. According to the characterization analysis such as XRD, FTIR, SEM-EDS, TEM, TG-DSC, and zeta potential, the adsorption mechanism of Gly by LDHs-400-MgAl is mainly attributed to the combined effect of electrostatic attraction, surface coordination, ion exchange and ion intercalation. In addition, LDHs-400-MgAl can be reused after 0.075 mol/L Na 2 CO 3 regeneration. Consequently, LDHs-400-MgAl has good adsorption capacity, selectivity, a broad pH range, and considerable scalability potential, enabling the effective removal of Gly from complex water environments.
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
APPLIED CLAY SCIENCE
·
2024
·
IF 5.3
Fulong Cheng,Jie Pan,Changxin Zhao,Wei Li,Yuting Peng,Zuo Zhang,Yanjuan Lin,Guowen Chen
Pure hydrotalcite (LDH) materials prepared from chemical reagents have been investigated as solid-phase phosphorus (P) inactivation materials (SPIM) to manage endogenous P loading in sediments. However, the efficacy and mechanism of LDH mixtures prepared by natural minerals and solid wastes in controlling sediment P release are unclear. Therefore, a Ca/Mg-Al-LDH (CMA-LDH) material was synthesized using sepiolite and cans, and its efficacy, mechanism, and ecological impact in controlling sediment P release were investigated. CMA-LDH-p was prepared as a control material using pure chemical reagents. The CMA-LDH and CMA-LDH-p were both composed of hydrotalcite and hydrocalumite. The maximum P adsorption capacity of CMA-LDH was 123.01 mg/g, comparable to that of CMA-LDH-p. The adsorbed P by CMA-LDH was mostly in the stable P form, accounting for 87.2 % of the total P. The adsorption capacity and immobilization ability of CMA-LDH for P were superior to other reported LDH-based SPIM. Both the CMA-LDH addition and capping successfully blocked sediment P release under anaerobic conditions. Passivation of mobile P in the sediment and DGT-labile P in the interstitial water was critical to preventing sediment P release by the CMA-LDH addition. The CMA-LDH capping inhibited sediment P release through the effective adsorption of CMA-LDH on DGT-labile P at the sediment/overlying water interface. The CMA-LDH addition and capping affected the abundance of microbial communities associated with iron and sulfur cycling, which might affect the stability of endogenous P. These results confirmed that CMA-LDH addition and capping treatments were effective methods for managing sediment P loading.
研究领域:
环境科学
·
生态学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Xiaodong Yang,Minghui Li,Zhiyong Hou,Xuefei Yang,Yuanxia Guo,Shuaiqi Luo,Jin Zhao,Kai Wang,Pengkai Sun,Qiang Yang,Rui Chen,Shuo Yang,Xin Lu,Lulu Liu,Lili Wang,Ye Han,Fanming Zeng,Bin Gao
Norfloxacin, a quinolone antibiotic pollutant, posed a significant threat to environment and human being health. In this study, hydrotalcite-based g-C 3 N 4 composites were produced using electrostatic self-assembly and the structural memory effect of hydrotalcite to optimize their adsorption-degradation of norfloxacin under visible-light illumination. Optimized hydrotalcite and g-C 3 N 4 composite (750°C, 40 wt% of g-C 3 N 4 ) exhibited a highest photo-degradation rate constant of 1.8×10 −2 min −1 with 83.98 % norfloxacin degradation achieved within 1.5 h under visible-light, surpassing that of bare g-C 3 N 4 and hydrotalcite photocatalysts. The synergistic effects of the composite, such as uniform flower-like micro-morphology and rich mesoporous structure, resulted in a large specific surface area (58.67 m 2 /g), abundant active sites, and good photo-generated charge separation efficiency. All these facilitated both sorption (7.95 mg/g) and subsequent visible-light degradation of norfloxacin. Furthermore, the superior photocatalytic performance observed in the degradation of norfloxacin under visible-light illumination was assigned to the effective transport of photogenerated electrons and holes between hydrotalcite and g-C 3 N 4 components. The work highlights the potentials of hydrotalcite and g-C 3 N 4 composites as an excellent photocatalyst for environment remediation and water treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 7
·3535-3545
·
IF 3.591
Guanqing Zhang,Xun Kan,Yong Zheng,Yanning Cao,Shijiang Liang,Yihong Xiao,Fujian Liu,Lilong Jiang
A variety of MgAl-layered double hydrotalcites (MA-LDHs-x) with different Mg/Al molar ratios (1 : 3–5 : 1) were prepared by a novel solid-thermal approach. The obtained MA-LDH-x catalysts were characterized by various techniques. These results confirm the successful preparation of MA-LDHs-x with a high degree of crystallinity, large BET surface areas, and unique nanosheet structures with controllable hexagonal morphology. In addition, MA-LDHs-x possess tunable OH− group contents, which could be correlated with the molar ratio of Mg/Al. As a result, the MA-LDH-x catalysts exhibited better catalytic performance in carbonyl sulfide (COS) hydrolysis (COS conversion: 100% at 130 °C for MA-LDHs-3 : 1 vs. 38% at 130 °C for commercial Fe2O3) and H2S selective oxidation (H2S conversion: 100% at 150 °C for MA-LDHs-3 : 1 vs. 41% at 150 °C for commercial Fe2O3) than commercial desulfurization catalysts. Superior activities found in MA-LDH-x catalysts were attributed to their controllable 2D nanosheet structures, and the unique structural characteristics enhance the mass transfer of guest molecules. Notably, the exposed OH− base sites of MA-LDHs-x efficiently activate the acid COS and H2S, which facilitate the COS hydrolysis to H2S, and the selective H2S oxidation to elemental sulfur.
研究领域:
材料科学
·
环境催化
✓ 已验证
DOI
高影响因子
Catalysts
·
2018
·Vol. 8
·期 8
·296
·
IF 3.465
Shuqi Fang,Kang Bi,Qiao Zhang,Lingpeng Chen,Yongming Sun,Hongyu Huang,Longlong Ma,Chenguang Wang
Layered double hydroxide (LDH) is a layered solid containing positively charged layers with negatively charged anions as an interchangeable interlayer. In this research, Mg(Al)O supports were synthesized with three different Mg:Al molar ratios, and bimetallic PtSn catalysts were loaded onto the supports via the anion exchange method. The properties of ethane dehydrogenation of the PtSn/Mg(Al)O catalysts were investigated. The results show that the structure and properties of the PtSn/Mg(Al)O catalysts were influenced by the Mg:Al molar ratio of the hydrotalcites, which consequently influenced the ethane dehydrogenation performance. When the Mg:Al ratio was 5:1, the ethane dehydrogenation performance was optimal, relative to the Mg:Al ratios of 2:1 and 10:1.Keywords:hydrotalcite;Mg:Al molar ratio;anion exchange method;ethane dehydrogenation
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2023
·
IF 8.3
Shupei Liu,Xinfang Zhang,Jinsong Rao,Liang Yu,Wei Lu,Huan Zhou,Shibo Chen,Yuxin Zhang,Xiaoying Liu
Ni-Co Layered Double Hydroxide (LDH) shows great application potential in the field of anti-corrosion. However, the poor carrying capacity limits the performance of anticorrosion performance. In this study, Ni-Co hydrotalcite was grown on the surface of DE, and Ni-Co/DE@SP microcapsule with corrosion inhibitor loading up to 14.7% was successfully prepared. The adsorption capacity of Ni-Co/DE@SP for Cl − in 600 mmol/L NaCl solution was 6.72 mmol/g. It is worth noting that the impedance modulus of the prepared composite coating (EP/Ni-Co/DE@SP) is two orders of magnitude higher than that of the pure resin coating, and the wear resistance was improved by 33%.
研究领域:
材料科学
·
腐蚀与防护
·
表面工程
✓ 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）