PURE AND APPLIED CHEMISTRY
·
2017
·Vol. 89
·期 7
·921-929
·
IF 2.626
Zhi Peng Cai,Wen Li Wang,Louis Conway,Kun Huang,Faisal Nureldin Awad,Li Liu,Josef Voglmeir
We herein demonstrate the use of 1,3-di(2-dipyridyl)propan-1,3-dione (DPPD) as a fluorogenic label for oligosaccharides. A number of milk-derived oligosaccharide standards were successfully labeled with this reagent, with the advantage of greatly simplified sample preparation compared to other commonly used fluorescent tags. DPPD shows a selectivity for oligosaccharides which do not possess a 2-acetamido-2-deoxy-hexose moiety at the reducing terminus, potentially aiding in the identification of complex mixtures of carbohydrates. The use of DPPD for the structural determination of oligosaccharides through exoglycosidase treatment, quantitative analysis of reactions, and in the synthesis of labeled oligosaccharides was also explored. This reagent has, in addition to the analysis of individual and mixed oligosaccharides, potential applications in the study of glycosidases and glycosyltransferases and as such represents a valuable addition to the tools available to the glycoscientist.
研究领域:
糖生物学
·
分析化学
·
生物化学
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DOI
高影响因子
PURE AND APPLIED CHEMISTRY
·
2020
·Vol. 92
·期 10
·1673-1682
·
IF 1.919
Wanjing Cui,Hongfang Hou,Jiaojiao Chen,Yafei Guo,Lingzong Meng,Tianlong Deng
Densities of the sodium arsenate aqueous solution with the molality varied from (0.04165 to 0.37306) mol · kg −1 were determined experimentally at temperature intervals of 5 K from 283.15 K to 363.15 K and ambient pressure using a precise Anton Paar Digital vibrating-tube densimeter. The apparent molar volumes ( V
ϕ
), thermal expansion coefficient ( α ) and partial molar volume
(
V
¯
B
)
were obtained based on the results of density measurement. The 3D diagram of apparent molar volume against temperature and molality as well as the diagram of thermal expansion coefficient and partial molar volume against molality were plotted, respectively. On the basis of the Pitzer ion-interaction equation of apparent molar volume model, the Pitzer single-salt parameters (
(
β
M,X
(
0
)
v
,
β
M,X
(
1
)
v
,
β
M,X
(
2
)
v
and
C
M,X
v
,
M
X
=
N
a
3
A
s
O
4
)
and their temperature-dependent correlation F ( i , p , T ) = a
1 + a
2 ln( T /298.15) + a
3 ( T – 298.15) + a
4 /(620 – T ) + a
5 /( T – 227) (where T is temperature in Kelvin, a
i
is the correlation coefficient) for Na 3 AsO 4 were obtained on account of the least-squares method. Predictive apparent molar volumes agree well with the experimental values, and those results indicate that the single-salt parameters and their relational coefficients of temperature-dependence for Na 3 AsO 4 obtained are reliable.
研究领域:
物理化学
·
热力学
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DOI
高影响因子
PURE AND APPLIED CHEMISTRY
·
2020
·Vol. 92
·期 10
·1683-1694
·
IF 1.919
Di Duan,Baogen Su,Zongbi Bao,Qiwei Yang,Yiwen Yang,Qilong Ren
Various toxic metal ions were successfully removed from solid matrix into supercritical CO 2 (scCO 2 ) by open-chain crown ether bridged diphosphates at 313.15 K and 20 MPa, these diphosphates with different ester side chains and different length of ethylene oxide bridge group are highly soluble in supercritical CO 2 . The extraction efficiency ( E %) of heavy metals is between 55 and 89%. Mulliken charge distribution of ligand’s P=O coordination group was calculated to indicate the stability of metal complex. The ligand structure effects and the rationale for different selectivity were discussed. In addition, binding property of these diphosphates towards the alkaline earth metals was further studied following the same extraction procedures. Alkaline earth metal ions Ca 2+ , Sr 2+ and Ba 2+ were extracted with E % at 49–74%, 50–73% and 16–64%, respectively. DFT calculations were performed to investigate the interaction energy of the complexes and the correlation with the E % was discussed.
研究领域:
化学
·
环境科学
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DOI
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Mengxin Yu,Yu Qian,Maofei Ni,Zhikang Wang,Ping Zhang
In this study, we examined the modulation of algae removal and algal organic matter (AOM) chemistry by potassium permanganate and poly-aluminum chloride (KMnO 4 -PAC) in simulated karst water. Specifically, we verified the compositional changes of AOM sourcing from Chlorella sp. and Pseudanabaena sp. in response to the presence of divalent ions (Ca 2+ and Mg 2+ ). Aromatic protein and soluble microbial products were identified as the primary AOM components. Divalent ions accelerated dissolved organic carbon (DOC) and UV 254 removal, particularly with Pseudanabaena sp. greater than Chlorella sp. (P < 0.05). Surface morphology analysis manifested that the removal of filamentous Pseudanabaena sp. was more feasible in comparison to globular Chlorella sp.. Our results highlight the significance of divalent ions in governing chemical behaviors and subsequent removal of both algae and AOM. This study upscales the understanding of the interactions among divalent ions, algae and AOM during preoxidation and coagulation process in algae-laden karst water.
研究领域:
环境科学
·
水处理
·
化学工程
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DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Xue Shen,Baoyu Gao,Kangying Guo,Chenghui Yu,Qinyan Yue
Precoagulation by polyaluminum chloride-poly dimethyl diallyl ammonium chloride (PAC-PDMDAAC) prior to ultrafiltration (UF) was conducted to evaluate the influence of PAC-PDMDAAC on controlling membrane fouling from typical natural organic matter (NOM) mixtures of humic acid (HA), bovine serum albumin (BSA) and sodium alginate (SA). Membrane flux decline and flux recovery after backwashing were investigated to evaluate the membrane fouling. The fouling mechanisms were determined from the floc size, floc structure and membrane resistance. PAC-PDMDAAC effectively alleviated membrane fouling caused by the HA, HA-BSA, HA-SA and HA-BSA-SA mixtures; furthermore, membrane fouling was better mitigated in the HA-SA and HA-BSA-SA mixtures. The untreated HA-SA and HA-BSA-SA mixtures caused much more serious total membrane resistance and fouling due to blocking and adsorption in the membrane pores by particles with sizes similar to those of the pores. The increased membrane flux and decreased irreversible resistance after the PAC-PDMDAAC pretreatment were attributed to the formation of flocs with a large size and small fractal dimension, which mainly formed a cake layer on the membrane surface. However, PAC-PDMDAAC was not particularly effective in reducing the irreversible membrane fouling originating from the HA and HA-BSA mixtures due to the formation of aggregates and pore blocking by microflocs.
研究领域:
环境科学
·
水处理工程
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DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Lucheng Li,Zehua Zhu,Jie Ni,Xiaojun Zuo
Phosphorus removal has been explored for a long time, however sustainable phosphorus adsorption and recovery with adsorbents recycling is rarely reported. This work proposes a sustainable phosphorus recycling route with calcium-modified powdered activated carbon with chitosan (Ca-PAC-CTS). The morphology, functional groups and crystal structure of Ca-PAC-CTS were characterized. The maximum phosphorus adsorption capacity was 16.73 mg/g Ca-PAC-CTS with Langmuir model at 298 K. Stable phosphorus sorption on Ca-PAC-CTS could be observed at the large range of pH (4– 10) when coexisting with NO 3 − , SO 4 2− , Cl − and F − , except HCO 3 − . 98.95 % The recovery of adsorbed phosphorus could get to 98.95 % using 0.05 M sulfuric acid solution, and the phosphate adsorption efficiency through Ca-PAC-CTS remained to be more than 80 % after five adsorption-desorption cycles, suggesting that Ca-PAC-CTS was one of the promising adsorbents for sustainable removal and recovery of phosphorus in aqueous solution.
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
IRANIAN POLYMER JOURNAL
·
2021
·Vol. 30
·期 7
·675-683
·
IF 1.899
Wei Liu,Jinju Ma,Hongjian Pang,Zongwu Wang,Xinding Yao
A degradable flocculant was prepared by natural renewable products (starch) and a cationic polymer. A cationic polyamine polymer was prepared by reaction of bis(hexamethylene)triamine with epichlorohydrin. The influence of substrate ratio and molecular weight of cationic polymer on flocculation was investigated and the optimum molecular weight was about 4000. Polyamine-modified starch flocculant was prepared by etherification reaction of cationic polyamine polymer and corn starch. The influence of substitution degree (DS) of starch on flocculation was investigated and the maximum DS was 0.18. The structure of starch-modified flocculant was characterized by XRD and the results confirmed that the plasticized samples contained some crystalline structures that were not destroyed by the etherification reaction process and some newly formed V-type crystalline structures were mainly induced by processing. Flocculation performance was evaluated in simulated kaolin suspension and was compared with that of commercial cationic polyacrylamide (CPAM) and polyaluminium chloride (PAC) flocculants. The flocculation effects of polyamine-modified starch flocculants and commercial flocculants under different dosages and pH values were compared. The results showed that the starch-modified flocculant had the best effect and the cationic starch derivatives flocculation performance increased with increasing DS, and exhibited steady flocculation performance to kaolin suspension in the broad pH range from 4 to 10. The preparation method of starch-modified flocculant is simple in preparation process, low in production cost and pollution-free, and facilitates industrial production.
研究领域:
环境科学
·
材料科学
·
化学工程
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yimu Qiao,Xue Han,Feiyong Chen,Cuizhen Sun,Linxu Xu,Rupeng Liu,Xue Shen
To guide the practical application of ozonation and adsorption coupled with ceramic membrane technology , the mitigation mechanisms of O 3 pre-oxidation, powdered activated carbon (PAC) pre-adsorption, and combined O 3 -PAC pretreatment on membrane fouling caused by natural organic matter (NOM) were investigated. The membrane and water quality were characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), three-dimensional fluorescence-parallel factor analysis (PARAFAC-EEM), dissolved organic carbon (DOC), laser particle size and Zeta potential . Results showed that the membrane flux decline caused by humic acid (HA), sodium alginate (SA), bovine serum albumin (BSA) and surface water were alleviated by 35.2%, 55.2%, 31.0% and 59.0% after O 3 -PAC pretreatment. Meanwhile the removal rates of HA, SA and BSA were 26.2, 74.8% and 42.3%, respectively. The combination of PAC and O 3 can effectively control the membrane fouling caused by HA and SA. Ozonation can degrade organic matter into small molecules, and PAC has high adsorption to these small molecules, by recycling PAC can take away this part of organic matter, thereby reducing membrane fouling. O 3 showed no obvious advantage for membrane fouling caused by BSA, and the decrease of membrane fouling was mainly attributed to the adsorption of PAC. This investigation highlights the potential mechanism of O 3 -PAC in alleviating the membrane fouling caused by different organic compounds, contributing to the efficient and low-carbon operation of the production.
研究领域:
环境工程
·
水处理
·
膜技术
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Mengen Wang,Qihang Cen,Rong Zeng,Yidi Huang,Yanling Liu,Shengji Xia
Membrane separation technologies have broad application prospects in water treatment . Compared with polymeric membranes, ceramic membranes have higher stability for long-term operation in practical applications. Coupling ceramic membranes with other water treatment processes is an effective way to improve membrane treatment effect and alleviate membrane fouling . This study evaluated the water purification efficiency and membrane fouling behaviors of powdered activated carbon (PAC), flat-sheet ceramic membranes and their hybrid process in treating model organic pollutants and natural water. Results showed that the PAC-ceramic membrane hybrid process could alleviate the membrane fouling caused by humic acid but aggravate that caused by sodium alginate . Addition of PAC notably improved the removal performance of the ceramic membrane for organic matters in natural water as well as pharmaceutical and personal care products , and effectively controlled membrane fouling. The PAC adsorption obviously reduced the irreversible fouling of the ceramic membrane under multi-cycle operation. This study can provide a reference for the practical application of ceramic membranes in drinking water treatment .
研究领域:
水处理
·
环境工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Baichun Wang,Kai Yang,Bohan Cai,Jintai Zhang,Chuyun Wei,Aijiao Zhou
Solar water purification is a promising scheme to relieve the energy crisis and clean water shortages. In order to improve the efficiency of producing water, it is necessary to develop a novel photothermal conversion interface to manage heat loss and boost water evaporation efficiency. Herein, a Janus hydrogel evaporator of powder active carbon (PAC) and Fe 3 O 4 in polyvinyl alcohol (PVA) and polystyrene sulfonate (PSS) cross-link hydrogel, called CFPS, is explored as the light absorber for broadband light absorption and formed a hydrogel network of the multi-hydrophilic group. Its hydrophilic/hydrophobic structure of CFPS is used to regulate heat loss and promote water transport, which can attain lower evaporation enthalpy and a higher evaporation rate . Specifically, the surface temperature of the CFPS can reach around 45 °C and 93.4% energy utilization efficiency under 1 sun illumination. In the comparison of the analogous Fe 3 O 4 -based evaporator, CFPS has the higher static evaporation rate with 3.43 kg m –2 h −1 . Besides, it has great mechanical properties, durability and anti-crystallization function, which can be adapted to the water purification scene of wastewater and hypersaline water desalination. This photosensitive magnetic hydrogel evaporator shows potential in the scenarios of wastewater purification and desalination.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Xiaoxiang Cheng,Chengsi Hou,Peijie Li,Congwei Luo,Xuewu Zhu,Daoji Wu,Xinyu Zhang,Heng Liang
Powdered activated carbon (PAC) has turned out to be an efficient adsorbent in drinking water treatment , whereas its application integrated with membrane filtration is still controversial because of the combined fouling effect between organic pollutants and PAC. To this end, an integrated process of combining PAC adsorption-catalytic oxidation and membrane filtration was proposed for natural surface water treatment . The synergistic effect of PAC and peroxymonosulfate (PMS) was confirmed through the generation of reactive oxidation species, and both radical oxidative pathways ( • OH, SO 4 •− and O 2 •− ) and nonradical ( 1 O 2 and PMS) pathways involved in the process. The removal efficiency of DOC and UV 254 was significantly strengthened by PAC/PMS, with removal rates of 56.1% and 64.9%, respectively. The integration of PAC and PMS could significantly enhance the reduction of fluorescent organics, and pollutants with varying molecular weights . The fouling condition of membrane was dramatically alleviated, with the flux increased by 38.9%, and the reversible and irreversible resistances declined by 79.7% and 48.3%, respectively. The major fouling mechanism was significantly changed, and complete pore blocking always played a dominant role, rather than cake filtration. The effectiveness of PAC/PMS was further verified by the characterization of membrane surface morphologies and functional groups. Moreover, the attractive interactions between foulants and membrane were converted to repulsive interactions with the pretreatment of PAC/PMS. The proposed synergistic process was efficient and convenient, which could significantly improve the purification efficiency of conventional PAC-UF system in drinking water treatment.
研究领域:
环境科学
·
水处理工程
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Qinzheng Zhao,Tianyin Huang,Zihao Cang,Yonghai Gan,Bin Xu,Bingdang Wu
Preloading the flocs on the membrane surface is beneficial to enhance the removal of contaminants and alleviate membrane fouling in the membrane-filtration process, but the appropriate flocs and its mechanism of action need to be further clarified. The present study first focused on the flocs generated by titanium xerogel coagulant (TXC) with PFS and PACl as comparation. Three flocs were separately pre-loaded on the ultrafiltration membrane to explore their performance of removing four toxic heavy metals (As(III), As(V), Sb(III) and Sb(V)) and alleviating membrane fouling. Results showed that the flocs produced by TXC and PFS could adsorb toxic oxygenates continuously, and the removal performance of TXC flocs is better than that of PFS, while the removal performance of PACl flocs is limited. After long-term operation, the membrane fouling of pre-loaded TXC floc was minimal, and the irreversible fouling was 1/3 and 1/6 of that of PFS and PACl, respectively. Meanwhile, the backwash time was 2.0 and 2.2 times longer than PFS and PACl, respectively. The mechanism of membrane fouling alleviation by floc preloading was clarified by floc characterization and model calculations. According to the n value in the model after fitting, an intermediate blocking mechanism dominated with the larger and more loose flocs in TXC system (n = 1.54), while a complete pore blocking mechanism dominated in the PFS (n = 1.98) and PACl (n = 2.11) systems. The results demonstrated that preloading the TXC flocs were superior to that of PFS and PACl in the membrane-filtration process.
研究领域:
环境科学
·
水处理工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）