Adsorption behavior of tightly bound extracellular polymeric substances on model organic surfaces under different pH and cations with surface plasmon resonance

Zhang, Peng; Chen, You‐Peng; Guo, Jinsong; Shen, Yu; Yang, Jiuzhong; Fang, Fang; Li, Chun; Gao, Xu; Wang, Guixue

doi:10.1016/j.watres.2014.03.018

Cited by 62 publications

(8 citation statements)

References 46 publications

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“…Ca 2+ was discovered to encourage EPS adsorption by forming EPS complexes. The Ca 2+ complexes were attracted by COOH-SAM but repelled by NH 2 -SAM [62].…”

Section: Discussionmentioning

confidence: 97%

“…The adsorption behaviour of EPS on different surfaces is largely unknown but previous studies have concluded that solution chemistry, such as the ionic strength and pH can dramatically impact the EPS deposition or adsorption [61]. To address this problem Zhang et al [62] prepared four self-assembled monolayers (SAM) carrying SAM-CH 3 , SAM-NH 2 , SAM-OH and SAM-COOH terminal groups and investigated the attachment and adsorption of EPS on these surfaces under different pH values and valences of additional cations using surface plasmon resonance. Ca 2+ was discovered to encourage EPS adsorption by forming EPS complexes.…”

Section: Discussionmentioning

confidence: 99%

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Reversed Crystal Growth of Calcite in Naturally Occurring Travertine Crust

2017

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Abstract:A microstructural investigation by electron microscopy on a travertine specimen collected from Munigou National Park, Sichuan Province, China revealed evidence of a non-classical reversed crystal growth route previously only discovered in synthetic materials. Examination of the travertine specimen suggests that the presence of organic matter initiates the oriented aggregation of calcite nanocrystallites. Surface re-crystallisation of the aggregates leads to a single crystalline rhombohedral shell with a polycrystalline core. This core-shell structure carries a strong resemblance to synthetic calcite prepared in the presence of chitosan, where the growth of calcite was found to follow the so-called reversed crystal growth process. It is proposed that the similar roles of biomolecules in naturally occurring travertine and chitosan in the synthetic system are based on their isoelectric points and the polymerizable property of long chain chemical structures. This study is important so that the structural similarities between naturally occurring biominerals and biomimetic materials can be further understood.

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“…Ca 2+ was discovered to encourage EPS adsorption by forming EPS complexes. The Ca 2+ complexes were attracted by COOH-SAM but repelled by NH 2 -SAM [62].…”

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Reversed Crystal Growth of Calcite in Naturally Occurring Travertine Crust

2017

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“…Peaks at 1655 cm −1 and 1638 cm −1 were attributed to C=O stretching vibrations of protein amide groups with β-sheets structure and α-helix structure respectively 24 , whereas peak at 1421 cm −1 was characteristic of C–H bending vibrations 22 . The peak between 921 and 1195 cm −1 were assigned to stretching vibrations of C–O and C–C, and deformation vibrations of C–O–H and C–O–C ,which also might be related to the vibrations of C–O–P , P–O–P or P=O 25 . It was the fingerprint region from 400 to 900 cm −1 and the peaks in the area were specified for phosphate groups or sulfated groups 26 .…”

Section: Resultsmentioning

confidence: 99%

Composition and aggregation of extracellular polymeric substances (EPS) in hyperhaline and municipal wastewater treatment plants

Zeng

Gao

Chen

et al. 2016

Sci Rep

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As important constituents of activated sludge flocs, extracellular polymeric substances (EPS) play significant roles in pollutants adsorption, the formation and maintenance of microbial aggregates, and the protection of microbes from external environmental stresses. In this work, EPS in activated sludge from a municipal wastewater treatment plant (M-WWTP) with anaerobic/anoxic/oxic (A2/O) process and a hyperhaline wastewater treatment plant (H-WWTP) with anaerobic/oxic (A/O) process were extracted by ultrasound method. The proteins and polysaccharides contents in EPS were determined by using a modified Lowry method and anthrone colorimetry respectively to analyze the detail differences in two types of WWTPs. Fourier transform-infrared spectroscopy and three-dimensional excitation-emission matrix fluorescence spectroscopy demonstrated proteins and polysaccharides were the dominant components of the two types of EPS, and the aromatic protein-like substances accounted for a larger proportion in EPS proteins. The results of the aggregation test indicated that EPS were good for the sludge aggregation, and the EPS in oxic sludge were more beneficial to sludge aggregation than that in anoxic sludge. Anoxic sludge EPS in H-WWTP showed a negligible effect on sludge aggregation. Comparative study on EPS of different tanks in the M-WWTP and H-WWTP was valuable for understanding the characteristics of EPS isolated from two typical wastewater treatment processes.

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“…4. According to the IUPAC classication, the raw 44 and they also exhibit mesoporous characteristics. This demonstrates that the mesoporous structures of the CTM and CNCs are not damaged during the composite formation process.…”

Section: Characterization Of Adsorbentsmentioning

confidence: 99%