Efficient removal of Pb(II), Cr(VI) and organic dyes by polydopamine modified chitosan aerogels

Guo, Dongmei; An, Qingda; Xiao, Zuoyi; Zhai, Shangru; Yang, Dongjiang

doi:10.1016/j.carbpol.2018.08.140

Cited by 225 publications

(57 citation statements)

References 45 publications

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“…4b and Table 3), suggesting that PPMs' adsorption process is controlled by chemisorption. The adsorption rate constant k 2 was determined to be up to 3.39 g/(mg min), which is higher than solid PDA microspheres [36] and the highest among all reported PDA derived materials for chromate removal [37,44]. We attribute this rapid adsorption kinetics of PPMs to the hierarchical porosity and high BET surface area.…”

Section: Rapid Cr(vi) Adsorption Kinetics Of Ppmsmentioning

confidence: 83%

“…By contrast, Fig. 6b shows the Cr(VI)-adsorbed PPMs have distinct Cr 2p peak, which can be subdivided into different peaks belonging to Cr(VI) and Cr(III) species [3,37]. It can find that the majority of Cr components are in Cr(III) state, as the content of Cr(III) peaks at 576.61 eV, 577.54 eV and 586.62 eV account for about 80% of the total chromium.…”

Section: Cr(vi) Adsorption Mechanisms Of Ppms Via Reduction and Immobmentioning

confidence: 91%

“…To better understand the adsorption mechanism, two commonly-adopted kinetic models were used to analyze the kinetic results [37,42]:…”

Section: Cr(vi) Removal Experimentsmentioning

confidence: 99%

“…However, the developed PDA-based adsorbents still suffer from relatively slow adsorption rate at low Cr(VI) concentration and show limited detoxifying effect of reduction Cr(VI). These drawbacks can be ascribed to the compact structure of these PDA-based adsorbents, which cannot offer sufficient active sites for reducing Cr(VI) and binding Cr(III) because of their low surface area with limited porosity [15,36,37]. Thus, we reasoned that porous PDA nanomaterials with hierarchical porosity and high surface area would endow the developed adsorbent with rapid adsorption kinetics and large removal capacity of Cr(VI) via adsorption and reduction.…”

Section: Introductionmentioning

confidence: 99%

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Facile preparation of hierarchical porous polydopamine microspheres for rapid removal of chromate from the wastewater

et al. 2020

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Cr(VI) containing industrial wastewaters are highly toxic and carcinogenic, and severely threats living creatures and the environment. Therefore, it is highly desired yet challenging to develop an available and economical adsorbent for simultaneously detoxifying Cr(VI) anions to Cr(III) ions and removing them from the wastewater. Here we propose a facile method for rapid removal of Cr(VI) ions from the wastewater by using a synthetic polydopamine microsphere (PPM) adsorbent with hierarchical porosity. The as-prepared PPM exhibits high Cr(VI) removal capacity of 307.7 mg/g and an outstanding removal efficiency. They can effectively decrease the Cr(VI) concentration to lower than 0.05 mg/L well below the limits for drinking water standard of WHO regulations in 60 s at pH 2. More importantly, PPMs can reduce the lethal Cr(VI) anions to Cr(III) ions with low toxicity, and simultaneously immobilize them on the matrices of PPMs.

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Section: Rapid Cr(vi) Adsorption Kinetics Of Ppmsmentioning

confidence: 83%

Section: Cr(vi) Adsorption Mechanisms Of Ppms Via Reduction and Immobmentioning

confidence: 91%

“…To better understand the adsorption mechanism, two commonly-adopted kinetic models were used to analyze the kinetic results [37,42]:…”

Section: Cr(vi) Removal Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Facile preparation of hierarchical porous polydopamine microspheres for rapid removal of chromate from the wastewater

et al. 2020

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“…Guo et al (2018) 206 synthesized polydopamine-modifiedchitosan (CS-PDA) aerogels through dopamine self-polymerization and glutaraldehyde cross-linking reactions to increase the capacity of adsorption and acid resistance of chitosan. CS-PDA were applied in the adsorption of Cr(VI) and Pb(II).…”

Section: à2mentioning

confidence: 99%