scholarly journals The combination of KMnO4 with HMO for cycles adsorption of heavy metal ions and regeneration of adsorbents

2021 ◽  
Author(s):  
Ruyue Ding ◽  
Chao Liu ◽  
Fencun Xie
Keyword(s):  
Heavy Metal ◽  
Zeta Potential ◽  
Metal Ions ◽  
Manganese Dioxide ◽  
Water Purification ◽  
Heavy Metal Ions ◽  
Competitive Adsorption ◽  
Removal Rate ◽  
Highly Active

Abstract In this experiment: three kinds of hydrous manganese dioxide (HMO) with different Zeta potential were synthesized, and combined with KMnO4 for deep removal of Pb2+, Cd2+ and Ni2+. The competitive adsorption of three heavy metal ions was also investigated. The results indicated that the stronger the acidity, the higher the Zeta potential (-54.3) of the synthesized HMO. After regenerating HMO with acidic KMnO4 as eluent, the removal rates of Pb2+, Cd2+ and Ni2+ could still reach 79.25%, 80.13% and 60.43% after five cycles of adsorption. The promoting mechanism of KMnO4's effect on HMO was analyzed by SEM, TEM, EDS, FTIR, XRD, XPS, BET, UV-vis. After absorbing of heavy metal ions, HMO will release part of Mn (II), and the released Mn (II) reacts with KMnO4 to form a small amount of highly active in-situ HMO. ‘HMO + KMnO4’ system can not only improve the removal rate of heavy metal ions by HMO, reduce the amount of adsorbent, but also remove the released Mn (II). Because of its reproducibility, efficiency and simplicity, the research on water purification materials and technologies is of significance.

Metal in situ surface functionalization of polymer-grafted-carbon nanotube composite membranes for fast efficient nanofiltration

2017 ◽  
Vol 5 (2) ◽  
pp. 583-592 ◽  
Author(s):  
Faizal Soyekwo ◽  
Qiugen Zhang ◽  
Runsheng Gao ◽  
Yan Qu ◽  
Ruixue Lv ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Carbon Nanotube ◽  
Metal Ions ◽  
Surface Functionalization ◽  
Heavy Metal Ions ◽  
Composite Membranes ◽  
Carbon Nanotube Composite

Metal in situ surface functionalized PEI-g-MWCNT membranes are facilely prepared for nanofiltration of heavy metal ions in solution with high fluxes.

Competitive adsorption of heavy metal ions on carbon nanotubes and the desorption in simulated biofluids

2015 ◽  
Vol 448 ◽  
pp. 347-355 ◽  
Author(s):  
Xin Ma ◽  
Sheng-Tao Yang ◽  
Huan Tang ◽  
Yuanfang Liu ◽  
Haifang Wang
Keyword(s):  
Carbon Nanotubes ◽  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Competitive Adsorption

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

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Haipeng Zhang ◽  
Fangfang Xu ◽  
Jinyuan Xue ◽  
Shiyong Chen ◽  
Juanjuan Wang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Metal Ions ◽  
Manganese Dioxide ◽  
Heavy Metal Ions

Preparation of Buoyant Adsorbent for the Removal of Heavy Metal Ions in Rainwater Runoff: Characteristics of Manganese – Dioxide – Coated Polypropylene Granules

2012 ◽  
Vol 586 ◽  
pp. 103-106
Author(s):  
Dong Seok Rhee ◽  
Sardor Mavlyankariev
Keyword(s):  
Heavy Metal ◽  
Adsorption Capacity ◽  
Manganese Dioxide ◽  
Heavy Metal Ions ◽  
Oxide Coating ◽  
Hydrodynamic Conditions ◽  
Adsorption Model ◽  
Rainwater Runoff ◽  
Adsorptive Properties

For the treatment of contaminated rainwater runoff, the synthesis of manganese dioxide and its coating onto buoyant polypropylene granule was done with accompanying adsorption experiments. Results showed 35-45 m oxide coating was stable under severe hydrodynamic conditions, had 37 mg of Mn attached per gram of granules, moreover, consisted of mixed birnessite and cryptomelane forms of manganese dioxide. Adsorption capacity of each gram of media was 4.9, 3.9, 0.98, 0.75 mg of Pb , Cu , Cd , and Zn , fitting well to the Freundlich adsorption model. Manganese-dioxide-coated polypropylene granules had favorable engineering advantages and excellent adsorptive properties, being challenging alternative to other practically-oriented in situ or centralized rainwater treatment media.

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