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Complementary Bifunctional Unique Properties of (α,β)‐PbO Nanoparticles for Efficient Catalysis and Adsorption for Water Remediation
Author(s) -
Guin Jhimli Paul,
Neogy Suman,
Kumar Pranaw,
Bhardwaj Yatender K.
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201902724
Subject(s) - adsorption , catalysis , bifunctional , chemistry , phase (matter) , chemical engineering , mineralization (soil science) , environmental remediation , nanoparticle , specific surface area , inorganic chemistry , nuclear chemistry , organic chemistry , contamination , ecology , nitrogen , engineering , biology
Lead oxides (PbO) of same chemical composition, but different crystallographic properties have been developed for complementary catalytic ozonation (designated by [PbO] a ) and adsorption (designated by [PbO] b ) of a model dye, reactive red–120 (RR‐120) with highest possible efficiency beyond the state‐of‐the‐art of individual processes. The highest extent of decolouration (∼99% after 4 min) with k a p p R R - 120 1.77×10 −2 s −1 and mineralization (50% after 15 min) of RR‐120 at pH 10.5 was achieved by ozonation using 0.5 g/L catalyst [PbO] a consisting major fraction of α‐PbO phase (α‐PbO: β‐PbO∼4:1) in its crystal structure. Minimum adsorption of RR‐120 (∼7%) on catalyst's surface [PbO] a led to higher accessibility of O 3 to free catalyst surface sites and helped to achieve highest efficiency of catalytic ozonation. On the other hand, adsorbent [PbO] b mainly consisting of β‐PbO phase (α‐PbO: β‐PbO∼1:4) with a fractional coexistence of α‐PbO phase showed excellent adsorption of RR‐120 (571 mg/g at 320 K) at pH 7.5, but it showed inferior efficiency in catalytic ozonation. Both the materials were found to be reusable and environmentally acceptable.