Adsorption mechanism of ZnO and CuO nanoparticles on two typical sludge EPS: Effect of nanoparticle diameter and fractional EPS polarity on binding

Wei, Liangliang; Ding, Jing; Xue, Mao; Qin, Kena; Wang, Sheng; Ming, Xin; Jiang, Junqiu; Zhao, Qingliang

doi:10.1016/j.chemosphere.2018.09.093

Cited by 33 publications

(7 citation statements)

References 44 publications

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“…A representative particle size of 50 um was selected to study its adsorption effect on different fractions of EPS. It was found that the five fractions of EPS were rapidly adsorbed within 1 h at the beginning and reached equilibrium within the next 5 h. This is consistent with the adsorption characteristics of EPS for metals, refractory substances [31], etc., which means that rapid adsorption is achieved in the early stage, and the adsorption effect is slow in the middle and late stages. This phenomenon may be due to the fact that PS surface has more active sites in the early stage.…”

Section: Adsorption Kinetics Analysissupporting

confidence: 81%

Adsorption Characteristics between Different Sizes of Microplastics and EPS Fractions of Anaerobic Granular Sludge

Lei,

Zhang,

Liu

et al. 2024

Pol. J. Environ. Stud.

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The adsorption characteristics between extracellular polymeric substances (EPS) and microplastics polystyrene (PS) in anaerobic granular sludge were studied. In anaerobic granular sludge, the smaller the particle size of microplastics, the more obvious the increase of total EPS. 0.5 um PS promotes an increase in EPS to 1.14 times that of the blank reactor, 200 um PS reduces the EPS to 0.91 times. Among the five fractions of EPS, the hydrophilic fraction (HPI) fraction can resist the toxicity of small size microplastics, so the increment is the most obvious. 5 um PS promotes an increase in the relative intensity of HPI from 55.5 mg/gVS to 87.2 mg/gVS. The adsorption behavior of the five fractions of EPS on microplastics PS can be well described by pseudo-second-order kinetics model and Freundlich model. Hydrophobic interaction, π-π electron-donor-receptor interaction, chemical adsorption and electrostatic attraction simultaneously affect the adsorption of five fractions of EPS by PS. The analysis of infrared spectroscopy, which showed that O-H stretching vibration, carbonyl C-O group, amide-1, amide-2 absorptivity, and phenol C-O bond have a great contribution to the adsorption of microplastics. It can be seen that small particle sizes of PS have a more significant impact on sludge EPS.

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Section: Adsorption Kinetics Analysissupporting

confidence: 81%

Adsorption Characteristics between Different Sizes of Microplastics and EPS Fractions of Anaerobic Granular Sludge

Lei,

Zhang,

Liu

et al. 2024

Pol. J. Environ. Stud.

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“…During sludge dewatering, the properties and structure of the sludge changed, which causes the sludge EPS ocs and microbial cells to crack, thereby releasing internal substances and moisture and improving the sludge dewatering performance (Sheng et al 2010). Studies have shown that sludge EPS is composed of microorganisms and their metabolites, and the primary components of which are protein, polysaccharides, and other organic substances (Wei et al 2019). 3D-EEM uorescence spectrum analysis was performed on the extracted three-layer EPS to explore the changes of organic matter in EPS, and the results are shown in Fig.…”

Section: Eps Analysismentioning

confidence: 99%

Freeze–thaw combined with activated carbon improves electrochemical dewaterability of sludge: Analysis of sludge floc structure and dewatering mechanism

Huang

Song

Yin

et al. 2021

Preprint

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Freeze–thaw (F/T) and electrochemistry are environment-friendly and efficient sludge treatment technologies. In this study, F/T and electrochemistry were combined in the pretreatment of sludge dewatering in the laboratory, and activated carbon (AC) was added to improve the electrochemical dewatering performance of sludge. During the experiment, the effect of F/T on the floc structure was analyzed by a laser particle analyzer and scanning electron microscope. F/T treatment not only improved the dewatering performance of sludge, but also promoted the aggregation of sludge flocs into larger particles. The median diameter (D50) increased from 45.27 µm to 128.94 µm. Then, the intracellular polymer of large-particle sludge was analyzed by three-dimensional excitation–emission matrix (3D-EEM). The tightly bound extracellular polymeric substances (TB-EPS) still contained a large amount of protein substances, which hindered the improvement of sludge dewatering performance. AC was added to the thawed sludge solution before electrochemical treatment (EP). The conductivity of AC enhanced the effect of EP, thereby cracking the sludge flocs. Thus, the light intensity of TB-EPS in the 3D-EEM fluorescence spectroscopy was decreased, and the D50 was also reduced to 105.3 µm. The final specific resistance of filtration and water content were reduced by 96.39% and 32.17%, respectively. Element analysis of the sludge cake after dehydration showed that the addition of AC significantly improved the combustion efficiency of the sludge cake. Moreover, preliminary economic analysis showed that the cost of this research was low, which indicated the potential application value of combined treatment.

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“…The formation of an EPS coating layer surrounding the ENPs (Khan et al, 2011b), is reported to increase the ENPs hydrodynamic diameter (Kroll et al, 2014) but also to decrease the ENPs rate of aggregation (Khan et al, 2011a;Adeleye et al, 2014;Kroll et al, 2014;Miao et al, 2015;Wang and Nowack, 2018), In addition, the electrostatic repulsion between ENPs can be favored when the surface charge is becoming more negative in presence of EPS (Khan et al, 2011a;Wang and Nowack, 2018). Steric repulsions and hydrophobic interactions also need to be considered regarding the aggregation rate of ENPs in presence of EPS (Lin et al, 2016;Wei et al, 2019). One of the main consequences of the ENPs stabilization in presence of EPS FIGURE 3 | Examples of processes associated to ENPs transformations and aggregation.…”

Section: Effect Of Biofilm and Corona-formation On Enps Aggregationmentioning

confidence: 99%

“…All three EPStypes were found to prevent nano-Ag aggregation, but loosely bound EPS were the most efficient, due to its lower content in hydrophilic dissolved OM. In addition, EPS hydrophobic properties can be important when considering sorption at ENPs surfaces (Wei et al, 2019).…”

Section: Effect Of Biofilm and Corona-formation On Enps Aggregationmentioning

confidence: 99%

How Microbial Biofilms Control the Environmental Fate of Engineered Nanoparticles?

Desmau

Carboni

Bars

et al. 2020

Front. Environ. Sci.

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Adsorption mechanism of ZnO and CuO nanoparticles on two typical sludge EPS: Effect of nanoparticle diameter and fractional EPS polarity on binding

Cited by 33 publications

References 44 publications

Adsorption Characteristics between Different Sizes of Microplastics and EPS Fractions of Anaerobic Granular Sludge

Adsorption Characteristics between Different Sizes of Microplastics and EPS Fractions of Anaerobic Granular Sludge

Freeze–thaw combined with activated carbon improves electrochemical dewaterability of sludge: Analysis of sludge floc structure and dewatering mechanism

How Microbial Biofilms Control the Environmental Fate of Engineered Nanoparticles?

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