Removal of Various Hazardous Materials Using a Multifunctional Biomass-Derived Hydroxyapatite (HAP) Catalyst and Its Antibacterial Effects

Abstract

In the present study, oyster shells, a cause of environmental pollution, were employed effectively to synthesize hydroxyapatite (HAP) by facile oxidation and phosphorylation. The ability of HAP to adsorb various metal cations and inhibit bacterial growth was validated. The biomass-derived HAP catalyst exhibited high metal cation adsorption in water at room temperature and under various acidic conditions (M = Cr, Mn, Ni, Cu, Cd, Ba, and Pb). HAP was demonstrated to have a maximum removal efficiency of 92.8% for the heavy metal Pb. Even under different pH conditions, HAP was demonstrated to be effective for the removal of three harmful heavy metals, Cr, Cd, and Pb, with a particularly high removal efficiency demonstrated for Pb under all conditions (average removal efficiency of Cr: 63.0%, Cd: 59.9%, and Pb: 91.6%). In addition, HAP had a significant influence on phosphate ion adsorption in aqueous solution, eliminating 98.1% after 3 min. Furthermore, biomass-derived HAP was demonstrated to have significant antibacterial activity against E. coli and S. aureus (5 mM: 74% and 78.1%, 10 mM: 89.6% and 96.0%, respectively).

Insights into performances of magnetic and bio-based doped-nanohydroxyapatites as water decontamination agents

“…Indeed, it is essential to widen the application field of adsorbents and evaluate their decontamination capability in differently polluted wastewater. [24][25][26] For the same purpose, we also investigated the antibacterial properties of iron-and iron/SBO-added materials, considering previous works reporting such antimicrobial ability for different hydroxyapatites. [27][28][29][30][31][32][33] The hydroxyapatite-based materials produced here are inspired by the studies of Mercado et al 20,21 , but the SBOs used as templates were compounds labeled Biobased Substances (BBS), obtained by a slightly different procedure than CVT230 (lab-scale).…”

Sustainable Processes for the Removal of Heavy Metals from Aquatic Systems

“…This Special Issue compiled 13 different research works [1][2][3][4][5][6][7][8][9][10][11][12][13], including 1 review paper [13]. This publication collection covers a wide range of topics related to the enhanced removal of heavy metals during primary treatments in wastewater management including speciation [13], sorption technologies [1][2][3][4][5][6][7]9,11], complexation [8] and coagulation [12].…”

“…This Special Issue compiled 13 different research works [1][2][3][4][5][6][7][8][9][10][11][12][13], including 1 review paper [13]. This publication collection covers a wide range of topics related to the enhanced removal of heavy metals during primary treatments in wastewater management including speciation [13], sorption technologies [1][2][3][4][5][6][7]9,11], complexation [8] and coagulation [12]. The main heavy metals addressed are: Cr(VI) [3,5,12], Cr(III) [2,6,9], Co(II) [11], iron [8], Cu(II) [2,4,7], Ni(II) [1,3], Cd(II) [1,2,6], Pb(II) [2,6] and Zn(II) [1], among others, such as alkaline earth elements [8].…”

“…Different materials such as Ni-Al alloy [12], inorganic adsorbents such as silica SBA-15 and titanosilicate ETS-10 [4], biomass [1][2][3]5,11], membranes (i.e., chitosan) [9], nanocellulose [8], ZnO nanoparticles [7], biosynthesized adsorbents (from oyster shells) such as hydroxyapatite [6] and nano modified coffee husk and coffee lignin [2] are presented in this volume. The strategy for their removal varies between direct (bio)adsorption, optimizing parameters such as pH, contact time, adsorption temperature and surface charge density [10].…”

“…The strategy for their removal varies between direct (bio)adsorption, optimizing parameters such as pH, contact time, adsorption temperature and surface charge density [10]. In two cases, a complementary antibacterial effect is included during the separation process [2,6], which is related to corresponding biomass development. In one case, a strategic safe disposal of the spent adsorbents is presented [1], which is an interesting and novel approach for the sustainability of adsorption processes.…”