Selective adsorption of Pb(II) from aqueous solution using porous biosilica extracted from marine diatom biomass: Properties and mechanism

Qi, Yarong; Wang, Jingfeng; Wang, Xin; Ji, Cheng; Wen, Zhiyou

doi:10.1016/j.apsusc.2016.11.069

Cited by 24 publications

(7 citation statements)

References 28 publications

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“…When the E value ranged between 8 -16 kJ/mol, the adsorption process is chemical in nature (25,26). In our study, the value of E is found to be less than 16 kJ/mol, and thus the adsorption of metal ions is a physisorption (25)(26)(27)(28)(29)(30)(31).…”

Section: Freundlich Modelmentioning

confidence: 54%

High Performance of UiO-66 Metal-Organic Framework Modified with Melamine for Uptaking of Lead and Cadmium from Aqueous Solutions

Abdelmoaty

El‐Wakeel²,

Fathy

et al. 2021

Preprint

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In this paper, UiO-66 metal-organic framework (MOF) was prepared by a hydrothermal method and modified consequently with melamine (MUiO-66), as so as enhance the adsorption properties of these materials in liquid-phase adsorption. With respect to this, the adsorption of lead and cadmium divalent ions was performed under varying conditions of pH, metal ion concentration, contact time, adsorbent dose and temperature. Morphology, texture properties, functional groups, crystallinity and thermal properties of both MOFs were examined. UiO-66 composed of sphere-like particles and covered by layers of melamine with enhancing in crystallinity and active sites as well as the total surface area increased from 1080 to 1160 m2/g. The modified UiO-66 with melamine (MUiO-66) showed a notable adsorption capacity of 177.5 and 146.6 mg/g for Pb and Cd (II) ions, respectively. Adsorption of both metals fitted well with the pseudo-second-order kinetic and Langmuir models and controlled by a physisorption mechanism at pH of 5. Also, adsorption process is an endothermic in nature and desorption is achieved well for three cycles by MUiO-66. Therefore, UiO-66 and MUiO-66 obtained in this work have a great promise in adsorption of heavy metals such as Pb and Cd(II) ions from wastewater.

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Section: Freundlich Modelmentioning

confidence: 54%

High Performance of UiO-66 Metal-Organic Framework Modified with Melamine for Uptaking of Lead and Cadmium from Aqueous Solutions

Abdelmoaty

El‐Wakeel²,

Fathy

et al. 2021

Preprint

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“…A fluorescent antibody test was used to investigate the adsorption performance of the frustule array under flow-through condition, as shown in Figure 2 . The outstanding adsorption performance of the diatom frustules have been verified by numerous excellent studies [ 29 , 30 , 31 ]. Photonic crystal effects of diatom frustules are also beneficial to the enhancement of the optical signal [ 32 ].…”

Section: Resultsmentioning

confidence: 98%

Diatom Frustule Array for Flow-Through Enhancement of Fluorescent Signal in a Microfluidic Chip

2021

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Diatom frustules are a type of natural biomaterials that feature regular shape and intricate hierarchical micro/nano structures. They have shown excellent performance in biosensing, yet few studies have been performed on flow-through detection. In this study, diatom frustules were patterned into step-through holes and bonded with silicon substrate to form an open-ended filtration array. Then they were fixed into a microfluidic chip with a smartphone-based POCT. Human IgG and FITC-labeled goat–anti-human IgG were adopted to investigate the adsorption enhancement when analyte flowed through diatom frustules. The results indicated up to 16-fold enhancement of fluorescent signal sensitivity for the flow-through mode compared with flow-over mode, at a low concentration of 10.0 μg/mL. Moreover, the maximum flow rate reached 2.0 μL/s, which resulted in a significant decrease in the testing time in POCT. The adsorption simulation results of diatom array embedded in the microchannel shows good agreement with experimental results, which further proves the filtration enrichment effect of the diatom array. The methods put forward in this study may open a new window for the application of diatom frustules in biosensing platforms.

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“…Compared with Figure 3(c), the peaks at 139 eV for Pb 4f 7/2 and 144 eV for Pb 4f 5/2 can be clearly identified in Figure 3(d), but these two peaks cannot be observed in Figure 3(c), thereby suggesting the Pb(II) uptake of the chelating membrane. Additionally, the fact of Pb(II) adsorbed by the chelating membrane is mainly exhibited by Pb 4f 7/2 and Pb 4f 5/2 and these two peaks correspond to the Pb (II) chemical state of Pb 2þ (Qi et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Water pollution caused by metal pollutants has received tremendous attention due to the increases in their discharged volumes and emission amounts (Cao et al., 2017; Qi et al., 2017). Pb(II) being one of the most toxic metal pollutants, its concentration in discharged wastewater has been strictly limited, for example the discharged concentration of total lead in China is strictly limited within 0.2 mg l −1 according to the published Chinese regulation of “Emission standard of pollutants for electroplating (GB 21900–2008),” while the discharge limit for lead by USEPA is 0.005 mg l −1 (Arbabi et al., 2015; Asuquo et al., 2017; Qi et al., 2017). Up to present, numerous techniques such as chemical precipitation, coagulation, biological treatment, ion exchange and adsorption, solvent extraction, and membrane separation have been developed for removing this pollutant from aqueous solutions (Abo-Farha et al., 2009; Akar et al., 2012; Baharuddin et al., 2015; Chen et al., 2009; Ghassabzadeh et al., 2010; Kang et al., 2011).…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Pb(II) by a polyvinylidene fluoride membrane bearing chelating poly(amino phosphonic acid) and poly(amino carboxylic acid) groups

Wang

Liu

et al. 2018

Adsorption Science & Technology

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Pb(II) can cause a hazardous effect on ecosystem and public health due to its high biotoxicity. A polyvinylidene fluoride-type membrane bearing both poly(amino phosphonic acid) and poly (amino carboxylic acid) functional groups was fabricated for the purpose of Pb(II) removal from the aqueous solutions. The adsorption behaviors of the fabricated chelating membrane toward Pb (II) were studied by the series of static and continuous adsorption experiments. When the pH, adsorption equilibrium time, initial Pb(II) concentration, and temperature were 5.1, 300 min, 1.0 mmol g À1 , and 298 K, respectively, Pb(II) uptake of the membrane was 1.1 mmol g À1. The presence of coexisting metal ions and complexing reagents decreased the Pb(II) uptake. The adsorption kinetic and isotherm adsorption followed pseudo-second-order equation and Langmuir model, respectively; this adsorption process showed a spontaneous and exothermic feature. The bed depth service time and Thomas models were suitable for describing obtained breakthrough curves.

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Selective adsorption of Pb(II) from aqueous solution using porous biosilica extracted from marine diatom biomass: Properties and mechanism

Cited by 24 publications

References 28 publications

High Performance of UiO-66 Metal-Organic Framework Modified with Melamine for Uptaking of Lead and Cadmium from Aqueous Solutions

High Performance of UiO-66 Metal-Organic Framework Modified with Melamine for Uptaking of Lead and Cadmium from Aqueous Solutions

Diatom Frustule Array for Flow-Through Enhancement of Fluorescent Signal in a Microfluidic Chip

Adsorption of Pb(II) by a polyvinylidene fluoride membrane bearing chelating poly(amino phosphonic acid) and poly(amino carboxylic acid) groups

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