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Zwitterion Polymer Functionalized Membranes for the Removal of Dyes and Heavy Metals Materials in Water.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Zwitterion Polymer Functionalized Membranes for the Removal of Dyes and Heavy Metals Materials in Water./
作者:	Gaxela, Nelisa Ncumisa.
面頁冊數:	1 online resource (109 pages)
附註:	Source: Dissertations Abstracts International, Volume: 83-07, Section: B.
Contained By:	Dissertations Abstracts International83-07B.
標題:	Hypotheses. -
電子資源:	click for full text (PQDT)
ISBN:	9798762145756

Zwitterion Polymer Functionalized Membranes for the Removal of Dyes and Heavy Metals Materials in Water.
Gaxela, Nelisa Ncumisa.

Zwitterion Polymer Functionalized Membranes for the Removal of Dyes and Heavy Metals Materials in Water. - 1 online resource (109 pages)

Source: Dissertations Abstracts International, Volume: 83-07, Section: B.

Thesis (Ph.D.)--University of Johannesburg (South Africa), 2020.

Includes bibliographical references

Water pollution is one of the challenges that affect the environment issues on earth as it comprises of different kinds of pollutants. Toxic dyes and heavy metals are one of the major pollutants that are being discharged to the environment if they are not well treated. Consuming these wastes result in health hazards that may even be fatal after some time. Removal of these pollutants via adsorption and membrane filtration is cost effective and environmentally benign. Polymer membranes are good bases for making membranes due to their unique properties like excellent aging resistance, good chemical resistance, thermal stability and high mechanical strength. Their hydrophobic nature however succumbs them to fouling as a result of pollutants forming a cake layer on the surface and being trapped inside the pores of the membrane. Permeate flux, solute rejection and flux recovery become affected a decrease in the membrane's performance and efficiency. Zwitterionic polymers poly(maleic anhydride-alt-1-octadecene-N,N-dimethylenediamine) p(MAO-DMEA) was used as an adsorbent for the removal of heavy metals and poly(maleic anhydride-alt-1-octadecene-3-(dimethylamino)-1-propylamine) p(MAO-DMPA) was used to enhance high dye and metal rejection, and antifouling properties in the membranes.The aim of this project was to synthesize the two zwitterionic polymers and apply them in enhancing the treatment of water containing dye and heavy radioactive metals The p(MAO-DMEA) powder was used as an adsorbent for the removal of Cd(II) in water. Central composite design was used to optimize the effect of mass and sample pH on the adsorption of Cd(II). The significance of the independent factors was examined using multivariate approach. The analysis of variance was used to investigate the effect and interactive effect of the selected factors. The ANOVA results in the form of a Pareto chart were used to assist in the visualization of the most significant effects on the adsorption of Cd(II). The optimization results showed that sample pH was the most significant parameter at 95% confidence level as it tends to influence the chemical speciation of Cd(II) in solution, the density of surface charge on the adsorbent as well as ionizations of functional groups. Four isotherm models namely, Langmuir, Freundlich, Redlich-Peterson (R-P) and Sips were used to understand the type of adsorption and to evaluate the maximum adsorption capacity (qmax). The data best fitted Langmuir isotherm model with high coefficient of determination compared to Freundlich. Therefore, monolayer adsorption is assumed with non-interaction between the adsorbed molecules. The adsorption capacity obtained from Langmuir isotherm model is 13.55 (mg g−1). Kinetic studies assist in describing the time required for adsorption process, and both linear and non-linear forms were used to understand the adsorption mechanism. The amount of Cd(II) adsorbed increased with increasing time until it reached equilibrium with gradual decrease in adsorption performance. The adsorption of Cd(II) was better fitted to the nonlinear pseudo-second-order model due to the high coefficient of determination of 0.9963. Elovich model showed that the uptake speed constant (α) value was higher than the adsorption speed constant (β) indicating that the adsorbent can be applicable for the removal of micro pollutants.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798762145756Subjects--Topical Terms:

1372657
Hypotheses.
Index Terms--Genre/Form:

554714
Electronic books.

Zwitterion Polymer Functionalized Membranes for the Removal of Dyes and Heavy Metals Materials in Water.
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