ANALYTICAL CHEMISTRY
·
2017
·
IF 6.32
Boyin Yan,Zhiquan Liu,Rui Huang,Yongpeng Xu,Dongmei Liu,Tsair-Fuh Lin,Fuyi Cui
There is a serious dispute on the existence of β-N-methylamino-l-alanine (BMAA) in water, which is a neurotoxin that may cause amyotrophic lateral sclerosis/Parkinson’s disease (ALS/PDC) and Alzheimer’ disease. It is believed that a reliable and sensitive analytical method for the determination of BMAA is urgently required to resolve this dispute. In the present study, the solid phase extraction (SPE) procedure and the analytical method for dissolved BMAA in water were investigated and optimized. The results showed both derivatized and underivatized methods were qualified for the measurement of BMAA and its isomer in natural water, and the limit of detection and the precision of the two methods were comparable. Cartridge characteristics and SPE conditions could greatly affect the SPE performance, and the competition of natural organic matter is the primary factor causing the low recovery of BMAA, which was reduced from approximately 90% in pure water to 38.11% in natural water. The optimized SPE method for BMAA was a combination of rinsed SPE cartridges, controlled loading/elution rates and elution solution, evaporation at 55 °C, reconstitution of a solution mixture, and filtration by polyvinylidene fluoride membrane. This optimized method achieved > 88% recovery of BMAA in both algal solution and river water. The developed method can provide an efficient way to evaluate the actual concentration levels of BMAA in actual water environments and drinking water systems.
研究领域:
环境科学
·
分析化学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2019
·
IF 4.046
Kai Luo,Jun Li,Qing Han,Zhongyuan Lu,Xin Deng,Li Hou,Yunhui Niu,Jun Jiang,Xiaoying Xu,Pan Cai
As an ideal cementitious material for the maintenance of historic buildings and the replacement of interior decoration mortars, the widespread application of natural hydraulic lime (NHL) is expected to play an important role in CO 2 capture and utilization. Structures and properties of NHL2 mortars with nano-SiO 2 (NS) under carbonation were researched in this paper. NHL mortars could capture CO 2 during hardening process of air-hardening contents, and the captured CO 2 would be fixed in the matrix to form CaCO 3 . Carbonation percentage and extent of NHL2 mortars increased by the addition of NS whatever in atmospheric or accelerated carbonation condition. Much more compacted carbonation surfaces than that of the uncarbonated region for NHL2 mortars with NS was observed. The addition of NS will reduce the porosity and big pores (approximately 1 μm) while increase the mesopores (approximately 50 nm) of the mortars. Carbonation reaction of NHL2 mortars seemed to be improved by the addition of NS, which would be beneficial to the collection, solidification and further utilization of CO 2 .
研究领域:
建筑材料学
·
环境科学
·
土木工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Jinglong Li,Fu Liu,Yan Qin,Jidong He,Zhu Xiong,Gang Deng,Qiang Li
Different from intensively used anticoagulant heparin, hirudin as a representative of natural bio-molecular inhibitors can form specific hirudin-thrombin complex and function as a serine proteinase to efficiently prevent blood coagulation with less bleeding adverse effect, no allergic reaction and immune of non-toxic reaction. We aim to develop a novel anticoagulant polylactide (PLA) membrane via immobilizing natural hirudin through the hydrogen bonding interaction. High amount of PVP (17.4 wt%) was first immobilized on the membrane surface through the interfacial crosslinking of P(VP-VTES). The abundant carbonyl groups with high inter-association constant (K=6000) on the membrane surface dominated the hydrogen bonding interaction with the carboxyl groups of hirudin [44] . The anti-clotting activity of PLA membrane increased with the active hirudin concentration. XPS, ATR-FTIR was conducted to confirm the chemistry evolution of PLA membranes immobilized by PVP and hirudin respectively. The intermediate PVP spacer promoted the hydrophilicity and effectively inhibited the platelet adhesion. While the enhanced hemocompatibility was distinctly revealed by the blood concretion four items (APTT, PT, TT and FIB) mainly thanks to the surface immobilization of hirudin. The anti-clotting stability of PLA membrane was evaluated with varied incubation time. The complement activation was also measured in terms of C3a and C5a. The anti-clotting PLA membrane showed excellent dialysis performances in terms of cleaning urea, creatinine, lysozyme while preserving BSA respectively.
研究领域:
生物材料学
·
医学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Architectural Heritage
·
2024
·
IF 2.3
Xiaohong Wei,Yumei Chai,Yunfeng Li,Wenwen Wang,Hongjie Luo,Biao Zhang,Yuxing Qin
Cracks are one of the common diseases on the surface and inside of stone cultural relics. The research and application of grouting materials are crucial for crack conservation of cultural relics. This work mainly studies the modification of Natural Hydraulic Lime (NHL2), a commonly used crack grouting material for stone cultural relics. Diethyl Carbonate (DEC) is used to modify Natural Hydraulic Lime to provide a carbon source within the system, and it can produce the raw material (CO2) needed for the reaction to maintain the continuous occurrence of hydration and carbonation reactions. Diethyl Carbonate-modified Natural Hydraulic Lime (DEC-NHL2) can keep the original physical phase and composition unchanged, refine the grain size, and increase the product of the hydration and carbonation reaction. In addition, it can promote the synchronous carbonation of the inner and surface parts, accelerate the coagulation rate of the slurry and improve the compressive strength, thus substantially enhancing the reaction continuity and stability of the NHL2 slurry, and avoiding the repair damage caused by stress concentration. It provides a new idea for grouting and protection of stone cultural heritages.
研究领域:
材料科学
·
文物保护
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2017
·
IF 4.208
Yiping Feng,Qingyun Song,Wenying Lv,Guoguang Liu
Ketoprofen (KET) is a mostly used nonsteroidal anti-inflammatory drug that has been frequently detected in wastewater effluents and surface waters. In this study, we investigated the degradation of KET by sulfate radical (SO 4 - ) based advanced oxidation processes (SR-AOPs) in aqueous solution. The degradation kinetics, mechanisms, and effects of natural water matrices on thermally activated persulfate (TAP) oxidation of KET were systematically investigated. Increasing the temperature and persulfate (PS) concentrations greatly enhanced the degradation of KET. KET degradation is pH-dependent with an optimum pH of 5.0. Reactions in the presence of radical quenchers revealed the dominant role of SO 4 - in oxidizing KET. Water matrix significantly influenced the degradation of KET. The common inorganic anions present in natural waters exhibited inhibitory effect on KET degradation, and the inhibition followed the order of Cl − > CO 3 2− > HCO 3 − > NO 3 − ; however, no significant inhibition of KET degradation was observed in the presence of Ca 2+ and Mg 2+ cations. The presence of natural organic matter (NOM) suppressed KET degradation, and the suppression increased as NOM concentration increase. Products identification and mineralization experiments revealed that KET and its degradation intermediates were finally transformed into CO 2 and H 2 O. The results of this study indicated that applying SR-AOPs for the remediation of KET contaminated water matrix is technically possible.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Junfeng Yang,Jingfeng Wu,Jun Xiong,Yu Wen,Shengyan Yin,Qin Zhang
Herein, utilizing cheap carbonated beverage (Fanta) as the carbon source, the multiphasic TiO 2 /Cu-C composites are successfully designed and prepared for efficient photocatalytic H 2 generation. Excitingly, the controllable preparation of triphasic, biphasic and rutile phase TiO 2 can be achieved by adjusting the reaction temperature. As expected, under ultraviolet–visible light irradiation, the triphasic TiO 2 /Cu-C-5 exhibited the best photocatalytic H 2 evolution rate (HER, 28.53 mmol g −1 h −1 ), which is about 21.45 and 1.65 times as high as than that of triphasic TiO 2 and P25/Cu-C-5, respectively. In addition, the HER reached 7.67, 12.47 and 3.46 mmol g −1 h −1 in Tianyi lake water, Ganjing river water and Bohai seawater, respectively. Furthermore, the experiment of inorganic salt ions effect on HPR shows that NO 3 − and SO 4 2 - ions have great negative influence. This transient photocurrent response, photoluminescence and photoluminescence lifetime experiments indicate that the carrier Cu-C and the construction of heterophase junctions are conducive to the separation of photogenerated charges and reducing their recombination efficiency, resulting in the improvement of the photocatalytic hydrogen evolution performance. Meanwhile, the Cu-C sample contains hollow spheres, which facilitate the refraction of light and enhance its absorption. These advantages strongly prove that the triphasic TiO 2 /Cu-C photocatalyst has potential application prospects in the field of catalytic hydrogen evolution in deionized water and natural water.
研究领域:
材料科学
·
光催化
·
能源化学
·
环境科学
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Yuanfu Ma,Chen Wang,Qing Feng
In this study, we aimed to magnetically separate phosphate from natural water and change its source-to-sink conversion to prevent eutrophication. To this end, a promising material in terms of phosphate removal efficiency and magnetic separability was developed. Nine types of magnetic composite P-removal agents were prepared by changing the types of metal salts (i.e., Zn 2+ , Cu 2+ , Mg 2+ , Al 3+ , Fe 3+ , Zr 4+ , Y 3+ , Ce 3+ , and La 3+ ), and the optimal agent was determined to be La 3+ /poly (acrylamide-co-acryloyloxyethyl thimethylammonium chloride)/Fe 3 O 4 [La 3+ /CPAM/Fe 3 O 4 ] based on phosphate removal efficiency. The optimal synthesis conditions, including reaction time (4 h), reaction temperature (65°C), and the content of metal salts (12.96 mmol), were determined. The synthesized material was characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, and vibrating-sample magnetometry. The results showed that the material featured a core–shell structure and exhibited good magnetic response. The experimental results showed that the removal process was rapid and completed within 20 min. Moreover, the material could greatly reduce P concentration, with phosphate removal efficiency reaching 90.07%. This material could effectively separate phosphate under the action of an external magnetic field and change the source-to-sink conversion of P, thereby preventing the risk of eutrophication.
研究领域:
环境科学
·
水处理技术
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
POLYHEDRON
·
2025
·
IF 2.6
Haoyun Lu,Kun Zhang,Liping Gao
The high-efficient detection of specific inorganic ions in H 2 O is extremely important, and monitoring S 2− and Ag + is of great significance because their abnormal levels will lead to many environmental and health problems. Herein we propose a long-wavelength absorbing carbocyanine dye DIDS-Li as a colorimetric probe to detect S 2− and Ag + based on color changes induced by structural changes of DIDS-Li. Sensing results suggest that the S 2− will cause the azure DIDS-Li to become colorless and the Ag + causes DIDS-Li to become bright yellow. This colorimetric probe also shows the good immunity to interference, a wide linear response range, and quantitative accuracy of S 2− and Ag + detections in natural water samples. Meanwhile, we also develop a smartphone analysis method that greatly improves the real-time detection ability of DIDS-Li for S 2− and Ag + . This work elucidates the relationship between carbocyanine dye and inorganic ions which offers a new means for efficient detection of S 2− and Ag + and the new idea for the application of carbocyanine dyes in colorimetric detection.
研究领域:
分析化学
·
环境监测
·
无机离子检测
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 12
·4927-4933
·
IF 1.821
Yi-Liang Cao,Yan Li,Fei Zhang,Jian-Zhong Huo,Xiao-Jun Zhao
Thiourea (TU) has been widely used in agriculture, industry and other application fields. Due to its serious toxicity and hazard to the environment, it is necessary to find a sensitive and selective method for detecting thiourea. Herein, a facile, fast, and specific colorimetric method was established for the determination of thiourea with high sensitivity based on leaching of gold nanoparticles (Au NPs) by thiourea. In hydrochloric acid media, the absorbance of the Au NPs at 519 nm decreased with the increase in the concentration of thiourea. The color change of the Au NPs with different concentrations of thiourea could make it convenient to be observed by the naked eye. This method allowed the determination of thiourea in the range of 5–350 nM with a detection limit of 2.14 nM. Various foreign species did not interfere with the determination. This method was found to be sensitive and selective and was applied for the determination of thiourea in natural water, industrial waste water and fruit juices.
研究领域:
分析化学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Junfeng Yang,Jinsong Lu,Liangsheng Xie,Jingfeng Wu,Yu Wen,Qin Zhang
Herein, the SrTiO 3 -TiO 2 -CaTiO 3 /Cu 2 O quaternary composite has been designed and prepared via one-step hydrothermal process followed by a NaBH 4 reduction treatment. By comparing the H 2 production rate (HPR) of Sr-Ti-Ca/Cu samples prepared by different Cu sources, it is found that Sr-Ti-Ca/Cu has the best H 2 production performance when CuCl 2 is as Cu source. As expected, the highest HPR of Sr-Ti-Ca/Cu sample is up to 5.088 mmol g −1 h −1 , which is 195.7 times as higher as that of the Sr-Ti-Ca sample (0.026 mmol g −1 h −1 ) under the same conditions. Moreover, the HPR reached 0.692, 0.530 and 0.647 mmol g −1 h −1 in tap water, lake water and river water, indicating that the photocatalyst has high practicability in natural water sources. In addition, the experiment of the tap water composition effect on H 2 production performance shows that NO 3 − and SO 4 2− ions have great negative influence on the HPR. Compared with Sr-Ti-Ca, the light absorption of Sr-Ti-Ca/Cu extends over the entire visible region, the interface resistance decreases, and the photocurrent density increases. These results suggest that the well-designed dual p-n heterojunctions and dual type-II heterojunctions in Sr-Ti-Ca/Cu sample can enhance the light absorption in the ultraviolet region and realize the rapid separation and migration of photogenerated charge, thereby accelerating the production of H 2 . This work shows the strong advantage and potential of non-precious metal efficient photocatalyst system for producing H 2 from deionized water and natural fresh water.
研究领域:
材料科学
·
化学
·
环境科学
·
能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Zijun Dong,Chengchun Jiang,Jingxin Yang,Xi Zhang,Weili Dai,Pengwei Cai
This work investigates the transformation of iodide (I − ) by Fe(II)-activated peroxydisulfate (PDS). The transformation of I − into iodate (IO 3 − ) is a two-step process, involving reactive iodine species, such as hypoiodous acid (HOI), as a key intermediate, and IO 3 − as the final product. In the first step, SO 4 •- produced by Fe(II)-activated PDS is mainly responsible for the transformation of I − into HOI. In the second step, Fe(IV) formed by the reaction of Fe(III) with PDS is required, to facilitate the further oxidation of HOI to IO 3 − . The disproportionation of HOI and the oxidation by PDS alone contribute negligibly to IO 3 − formation. The IO 3 − yield increases to a maximum, before decreasing gradually, with increased PDS and Fe(II) dosages. The transformation of I − into IO 3 − is favored by lower pH and higher temperature, due to the greater SO 4 •- production by the reaction of Fe(II) with PDS under these conditions. Humic acid , as a representative natural organic matter, scavenges the formed HOI to form iodinated disinfection byproducts , which largely inhibit the transformation of I − into IO 3 − . In addition, the transformation of I − into IO 3 − and iodinated disinfection byproducts by Fe(II) activated PDS was confirmed in the natural waters.
研究领域:
环境化学
·
水处理
·
高级氧化过程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Wei Li,Yuxin Li,Deyun Zhang,Yeqing Lan,Jing Guo
CuO-Co 3 O 4 @CeO 2 nanoparticles used as a heterogeneous catalyst were prepared via a sol-gel method and characterized by various techniques. For comparison, a series of oxides was investigated for activating peroxymonosulfate (PMS) during the degradation of 2,4-dichlorophenoxyacetic acid (2,4-D). The results indicated that CuO-Co 3 O 4 @CeO 2 exhibited the highest catalytic performance among the catalysts. Complete degradation of 2,4-D (20 mg/L) was realized within 45 min at 1 mM PMS, CuO-Co 3 O 4 @CeO 2 loading of 0.07 g/L, and pH of 6. Recycling experiments confirmed that CuO-Co 3 O 4 @CeO 2 was very stable, and the 2,4-D degradation efficiencies ranged from 100% to 97.5%, decreasing by only 2.5% after the fifth run. The outstanding catalysis of CuO-Co 3 O 4 @CeO 2 resulted from the synergy of cerium, cobalt, and copper. Electron paramagnetic resonance and radical scavenger experiments confirmed the production of SO 4 • − and • OH radicals in the CuO-Co 3 O 4 @CeO 2 /PMS system, which were responsible for efficient decomposition of 2,4-D. Furthermore, the combination of CuO-Co 3 O 4 @CeO 2 andPMS was applied to treat natural water containing 2,4-D, and a high 2,4-D removal rate was also achieved. Based on these results, it was deduced that CuO-Co 3 O 4 @CeO 2 can be utilized as a catalyst to activate PMS and destroy organic contaminants in aqueous solution.
研究领域:
环境科学
·
催化
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）