Efficient removal of Pb(<scp>ii</scp>) ions using manganese oxides: the role of crystal structure

Zhang, Haipeng; Wu, An‐Bang; Fu, Heyun; Zhang, Ling; Liu, Hui; Zheng, Shourong; Wan, Haiqin; Xu, Zhaoyi

doi:10.1039/c7ra05955h

Cited by 85 publications

(38 citation statements)

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“…The deposition of MnO 2 caused a significant decrease in the zeta potential, and the IEP of BC@MnO 2 -26.6 was 2.8. Notably, the IEP of MnO 2 was 2.1, consistent with a prior report (2)(3)(4) 8 . Hence, the lower IEP of BC@MnO 2 -26.6 compared to that of MnO 2 may be due to the deposition of MnO 2 .…”

Section: Resultssupporting

confidence: 90%

“…The removal rates decreased with increasing adsorption time. Similar results have been reported for other MnO 2 systems 8,31 . The treatable bed volume (BV) of Pb(II), Cd(II), Cu(II), and Zn(II) by BC@MnO 2 -26.6 was 320, 233, 267, and 213 BV, respectively.…”

Section: Fixed-bed Column Sorptionsupporting

confidence: 91%

“…Because we did not investigate the column adsorption capacity, the Thomas model was adopted www.nature.com/scientificreports www.nature.com/scientificreports/ to predict column breakthrough (at C e /C 0 = 1) 48 . The removal capacity at the breakthrough point was 2.1 × 10 6 , 1.1 × 10 6 , 6.7 × 10 5 , and 5.2 × 10 5 mg g −1 for Pb(II), Cd(II), Cu(II), and Zn(II), respectively, significantly higher than for commercial BCs, nano-MnO 2 , or MnO 2 -loaded resin 8,46,49 . This is mainly due to the highly dispersed MnO 2 on the surface of the BC.…”

Section: Fixed-bed Column Sorptionmentioning

confidence: 91%

mentioning

confidence: 99%

“…Nanosized metal oxides (e.g., zirconium oxides 5 , iron oxides 6 , aluminum oxides 7 , and manganese oxides 8 ) are potential adsorbents because of their large surface areas, abundance of defect sites, and high surface to bulk atom ratios. Compared with their bulk counterparts, nanosized metal oxides exhibit better performance for adsorbing heavy metal ions 4,8 . Manganese oxides are excellent adsorbents because of their ability to form complexes with heavy metal ions (e.g., Cd(II), Cu(II), Zn(II), and Pb(II)) and good chemical stability under basic and acidic conditions 9 .…”

mentioning

confidence: 99%

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Enhanced removal of heavy metal ions from aqueous solution using manganese dioxide-loaded biochar: Behavior and mechanism

Zhang

Xue

et al. 2020

Sci Rep

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In this study, a redox precipitation method was used to load manganese dioxide (MnO 2 ) nanoparticles on biochar (BC) (BC@MnO 2 ) pyrolyzed from the invasive water hyacinth, and the adsorption of Cd(II),Cu(II), Zn(II), and Pb(II) was investigated. Several techniques were used to characterize the adsorbents. The results revealed that the BC surface was covered by many intertwined thin amorphous MnO 2 nanosheets, which significantly increased its specific surface area and pore volume. The adsorption of heavy metal ions by BC was negligible, whereas the MnO 2 -containing adsorbents exhibited a high capacity for adsorbing heavy metal ions. However, the MnO 2 -normalized adsorption amount decreased with increasing MnO 2 load and was largely unchanged at MnO 2 loads of 26.6% to 30.2%. The capacity for adsorbing heavy metal ions of BC@MnO 2 was pH-dependent, but the adsorption affinity was unaffected by coexisting ions. Column tests revealed that BC@MnO 2 with a load of 26.6% had a high capacity for removing heavy metal ions from simulated and real electroplating wastewater. Therefore, BC@MnO 2 with a load of 26.6% shows promise as a regenerable adsorbent for removing heavy metal ions from water/wastewater. This study could lay an essential foundation to develop a win-win strategy for heavy metal ions removal from wastewater using biochar derived from water hyacinth. open Scientific RepoRtS | (2020) 10:6067 | https://doi.org/10.1038/s41598-020-63000-z www.nature.com/scientificreports www.nature.com/scientificreports/ dispersibility and adsorption. Nanosized MnO 2 loaded on materials with a high specific surface area-such as graphene oxide 11 , ordered mesoporous silica 15 , and ordered mesoporous carbon materials 16 exhibited higher performance in energy storage, catalysis, and adsorption than aggregated nanosized MnO 2 . However, materials with large specific surface areas are costly and difficult to manufacture, which restricts their large-scale preparation and application. Hence, the loading of nanosized MnO 2 onto low-cost supporting materials with large specific surface areas shows promise.Biochar (BC) is produced via pyrolysis of organic feedstocks at <700 °C under oxygen-limited conditions. Unfortunately, blank BC often exhibits relatively low adsorption efficiency for heavy metal ions 4,17 . However, due to its abundant surface functional groups, availability, and low cost, BC is suitable for hosting metal oxides for adsorption and catalysis applications 7 . For example, metal hydroxides such as Fe-Mn binary oxides 18 , iron oxides 19,20 , aluminum oxides 21,22 , and silicon 23 have been introduced to the inner and outer surfaces of BC. Sun et al. 24 , Qiu et al. 25 , and Li et al. 26 studied the application of MnO 2 -loaded BC for removing Pb(II), Cd(II), and fluoroquinolone antibiotics, respectively. Prior studies have focused on the preparation and adsorption performance of MnO 2 -loaded BC. However, the means of enhancing MnO 2 loading and reactions among BC, MnO 2 , and target contaminants have been overlo...

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Section: Resultssupporting

confidence: 90%

Section: Fixed-bed Column Sorptionsupporting

confidence: 91%

Section: Fixed-bed Column Sorptionmentioning

confidence: 91%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Enhanced removal of heavy metal ions from aqueous solution using manganese dioxide-loaded biochar: Behavior and mechanism

Zhang

Xue

et al. 2020

Sci Rep

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Transition Metal Oxides with Broaden Potential Window for High‐Performance Supercapacitors

Jabeen,

Hussain,

Ali

2023

Electroceramics for High Performance Supercapacitors

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Biogenic synthesis of δ‐MnO₂ nanoparticles: A sustainable approach for C‐alkylation and quinoline synthesis via acceptorless dehydrogenation and borrowing hydrogen reactions

Ghosh

Hegde

Limaye

et al. 2023

Applied Organom Chemis

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The sustainable and environmentally benign biogenic synthesis of manganese‐oxide nanoparticles (MnO2 NPs) in a single crystalline δ‐phase and its subsequent synthetic utility have been described. The synthesized δ‐MnO2 NPs were characterized using scanning electron microscopy (SEM), energy dispersive X‐ray (EDX), and X‐ray diffraction (XRD) analysis techniques. The detailed analysis envisages the reduction of Mn(VII) to Mn(IV) was facilitated by various phytochemicals present in the aq. mango leaves extract, avoiding the use of external ligand source. The synthesized δ‐MnO2 NPs were perceived in a single delta (δ) monoclinic crystalline phase, wherein a spherical agglomerated morphology was displayed with a particle size of <5 nm. Further, the utility of newly developed δ‐MnO2 NPs was showcased for alpha‐keto‐alkylation and quinoline synthesis via hydrogen autotransfer and the acceptorless dehydrogenative coupling strategy. Moreover, a series of control experiments, mechanistic elucidation, catalyst recyclability, and a dye removal study were demonstrated.

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Efficient removal of Pb(ii) ions using manganese oxides: the role of crystal structure

Abstract: The adsorption of Pb(ii) by MnO2 depends on crystal structure; δ-MnO2 exhibited higher adsorption capacity than α-, β-, γ- and λ-MnO2.

Cited by 85 publications

References 50 publications

Enhanced removal of heavy metal ions from aqueous solution using manganese dioxide-loaded biochar: Behavior and mechanism

Enhanced removal of heavy metal ions from aqueous solution using manganese dioxide-loaded biochar: Behavior and mechanism

Transition Metal Oxides with Broaden Potential Window for High‐Performance Supercapacitors

Biogenic synthesis of δ‐MnO₂ nanoparticles: A sustainable approach for C‐alkylation and quinoline synthesis via acceptorless dehydrogenation and borrowing hydrogen reactions

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Efficient removal of Pb(ii) ions using manganese oxides: the role of crystal structure

Abstract: The adsorption of Pb(ii) by MnO2 depends on crystal structure; δ-MnO2 exhibited higher adsorption capacity than α-, β-, γ- and λ-MnO2.

Cited by 85 publications

References 50 publications

Enhanced removal of heavy metal ions from aqueous solution using manganese dioxide-loaded biochar: Behavior and mechanism

Enhanced removal of heavy metal ions from aqueous solution using manganese dioxide-loaded biochar: Behavior and mechanism

Transition Metal Oxides with Broaden Potential Window for High‐Performance Supercapacitors

Biogenic synthesis of δ‐MnO2 nanoparticles: A sustainable approach for C‐alkylation and quinoline synthesis via acceptorless dehydrogenation and borrowing hydrogen reactions

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Biogenic synthesis of δ‐MnO₂ nanoparticles: A sustainable approach for C‐alkylation and quinoline synthesis via acceptorless dehydrogenation and borrowing hydrogen reactions