![Azadirachta indica (Neem) leaf powder as a biosorbent for removal of Cd(II) from aqueous medium [An article from: Journal of Hazardous Materials]](https://www.ebooknetworking.net/books/B00/0RR/bigB000RR7NO2.jpg)
Azadirachta indica (Neem) leaf powder as a biosorbent for removal of Cd(II) from aqueous medium [An article from: Journal of Hazardous Materials]
Book Details
Author(s)A. Sharma, K.G. Bhattacharyya
PublisherElsevier
ISBN / ASINB000RR7NO2
ISBN-13978B000RR7NO1
AvailabilityAvailable for download now
Sales Rank99,999,999
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Journal of Hazardous Materials, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
A biosorbent, Neem leaf powder (NLP), was prepared from the mature leaves of the Azadirachta indica (Neem) tree by initial cleaning, drying, grinding, washing to remove pigments and redrying. The powder was characterized with respect to specific surface area (21.45m^2g^-^1), surface topography and surface functional groups and the material was used as an adsorbent in a batch process to remove Cd(II) from aqueous medium under conditions of different concentrations, NLP loadings, pH, agitation time and temperature. Adsorption increased from 8.8% at pH 4.0 to 70.0% at pH 7.0 and 93.6% at pH 9.5, the higher values in alkaline medium being due to removal by precipitation. The adsorption was very fast initially and maximum adsorption was observed within 300min of agitation. The kinetics of the interactions was tested with pseudo first order Lagergren equation (mean k"1=1.2x10^-^2min^-^1), simple second order kinetics (mean k"2=1.34x10^-^3gmg^-^1min^-^1), Elovich equation, liquid film diffusion model (mean k=1.39x10^-^2min^-^1) and intra-particle diffusion mechanism. The adsorption data gave good fits with Langmuir and Freundlich isotherms and yielded Langmuir monolayer capacity of 158mgg^-^1 for the NLP and Freundlich adsorption capacity of 18.7Lg^-^1. A 2.0g of NLP could remove 86% of Cd(II) at 293K from a solution containing 158.8mg Cd(II) per litre. The mean values of the thermodynamic parameters, @DH, @DS and @DG, at 293K were -73.7kJmol^-^1, -0.24Jmol^-^1K^-^1 and -3.63kJmol^-^1, respectively, showing the adsorption process to be thermodynamically favourable. The results have established good potentiality for the Neem leaf powder to be used as a biosorbent for Cd(II).
Description:
A biosorbent, Neem leaf powder (NLP), was prepared from the mature leaves of the Azadirachta indica (Neem) tree by initial cleaning, drying, grinding, washing to remove pigments and redrying. The powder was characterized with respect to specific surface area (21.45m^2g^-^1), surface topography and surface functional groups and the material was used as an adsorbent in a batch process to remove Cd(II) from aqueous medium under conditions of different concentrations, NLP loadings, pH, agitation time and temperature. Adsorption increased from 8.8% at pH 4.0 to 70.0% at pH 7.0 and 93.6% at pH 9.5, the higher values in alkaline medium being due to removal by precipitation. The adsorption was very fast initially and maximum adsorption was observed within 300min of agitation. The kinetics of the interactions was tested with pseudo first order Lagergren equation (mean k"1=1.2x10^-^2min^-^1), simple second order kinetics (mean k"2=1.34x10^-^3gmg^-^1min^-^1), Elovich equation, liquid film diffusion model (mean k=1.39x10^-^2min^-^1) and intra-particle diffusion mechanism. The adsorption data gave good fits with Langmuir and Freundlich isotherms and yielded Langmuir monolayer capacity of 158mgg^-^1 for the NLP and Freundlich adsorption capacity of 18.7Lg^-^1. A 2.0g of NLP could remove 86% of Cd(II) at 293K from a solution containing 158.8mg Cd(II) per litre. The mean values of the thermodynamic parameters, @DH, @DS and @DG, at 293K were -73.7kJmol^-^1, -0.24Jmol^-^1K^-^1 and -3.63kJmol^-^1, respectively, showing the adsorption process to be thermodynamically favourable. The results have established good potentiality for the Neem leaf powder to be used as a biosorbent for Cd(II).
