Abstract
Biosorbents for remediating aquatic environmental media polluted with hazardous heavy metals and metalloids such as Pb(II), Cr(VI), Sb(III and V), and As(III and V) were prepared from lignin waste, orange and apple juice residues, seaweed and persimmon and grape wastes using simple and cheap methods. A lignophenol gel such as lignocatechol gel was prepared by immobilizing the catechol functional groups onto lignin from sawdust, while lignosulfonate gel was prepared directly from waste liquor generated during pulp production. These gels effectively removed Pb(II). Orange and apple juice residues, which are rich in pectic acid, were easily converted using alkali (e.g., calcium hydroxide) into biosorbents that effectively removed Pb(II). These materials also effectively removed Sb(III and V) and As(III and V) when these were preloaded with multi-valent metal ions such as Zr(IV) and Fe(III). Similar biosorbents were prepared from seaweed waste, which is rich in alginic acid. Other biosorbents, which effectively removed Cr(VI), were prepared by simply treating persimmon and grape wastes with concentrated sulfuric acid.
Highlights
Industrial development has caused serious environmental pollution problems that have negative effects on society
As we did for the crosslinked pectic suggesting that Pb(II) and Zn(II) were adsorbed more strongly by SOJR than by WK11 resin. It appeared that the40difference between the pH values at which Pb(II) and Zn(II) were adsorbed was greater for SOJR than 40 for WK11 resin, suggesting that these metal ions could be more 20 using WK11. These results indicate that biosorbents prepared separated using SOJR than cheaply from biomass waste have better adsorption properties than do synthetic adsorbents produced from petroleum
The biosorbents prepared from saw-dust, lignin, orange and apple juice residues, and waste seaweeds were highly selective for Fe(III) and Pb(II) over other metal ions, Zn(II), and Pb(II) was satisfactorily separated from Zn(II) using columns packed with these bioadsorbents
Summary
Industrial development has caused serious environmental pollution problems that have negative effects on society. Conventional highly porous adsorbents, such as activated carbon and ion exchange resins (including chelating ion exchange resins), are expensive and suffer another problem from a practical point of view This problem is that, most effluents contain very fine solid particles that enter and clog the micro-pores (which contain the sites at which heavy metals are adsorbed) of the adsorbent, causing the effectiveness of the adsorbent to be deteriorate. Chitin poorly adsorbs most metal ions, chitosan that has been subjected to a simple hydration reaction using a concentrated solution of sodium hydroxide has a remarkable ability to adsorb heavy metal ions such as Cu(II) [2,3] Another example is lignin, a major component of all plants (along with cellulose). We introduce biosorbents we have prepared and describe their adsorption behaviors for hazardous heavy metals and metalloids
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
