Low Cost Biosorbents Based On Modified Starch Iron Oxide Nanocomposites For Selective Removal Of Some Heavy Metals From Aqueous Solutions

2016 ◽  
Vol 7 (5) ◽  
pp. 402-409 ◽  
Author(s):  
Abdul-Raheim M. Abdul-Raheim
Keyword(s):  
Heavy Metals ◽  
Iron Oxide ◽  
Aqueous Solutions ◽  
Low Cost ◽  
Selective Removal ◽  
Modified Starch

Development of a method for detecting trace metals in aqueous solutions based on the coordination chemistry of hexahydrotriazines

The Analyst ◽  
2015 ◽  
Vol 140 (15) ◽  
pp. 5184-5189 ◽  
Author(s):  
Rudy J. Wojtecki ◽  
Alexander Y. Yuen ◽  
Thomas G. Zimmerman ◽  
Gavin O. Jones ◽  
Hans W. Horn ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Coordination Chemistry ◽  
Trace Metals ◽  
Aqueous Solutions ◽  
Detection System ◽  
Low Cost ◽  
System P ◽  
Chemical Indicator

The detection of trace amounts (<10 ppb) of heavy metals in aqueous solutions is described using hexahydrotriazines as a chemical indicator and a low cost fluorimeter-based detection system.

scholarly journals Potential of Iron Pillared Clay as Active Nanocatalyst for Rapid Decolorization of Methylene Blue

2019 ◽  
Vol 7 (2) ◽  
pp. 46-53
Author(s):  
Lal hmunsiama ◽  
◽  
Seung-Mok Lee ◽  
Keyword(s):  
Methylene Blue ◽  
Iron Oxide ◽  
Aqueous Solutions ◽  
Low Cost ◽  
Analytical Data ◽  
Bentonite Clay ◽  
Pillared Clay ◽  
Oh Radicals ◽  
Heterogeneous Structure ◽  
Iron Oxide Particles

In this study, the iron-pillared clay nanocatalyst (ICN) was employed as a nanocatalyst for decolorization of methylene blue (MB) in aqueous solutions without hydrogen peroxide. The changes in clay structure after the incorporation of iron-oxide particles was studied with the help of XRD analytical data. The SEM micrographs showed higher heterogeneous structure of ICN compared to pristine clay and the specific surface area of ICN (82.54 m2/g) is considerably higher than the unmodified clay (63.41 m2/g). Further, the EDX analytical data indicate the successful incorporation of iron-oxide into bentonite clay. Batch experiments showed that ICN could degrade MB within pH 3.0 to 11.0 and it is efficient even at higher concentrations. The degradation is very fast and more than 90% is removed within 30 mins. A small amount of ICN is effective for degradation of MB and the reusability test showed that ICN can be reuse for several times for the degradation of MB in aqueous solutions. The effect of scavengers studies indicate that the ·OH radicals generated from the ICN are responsible in the degradation of MB. This study indicates that ICN must be low cost and environmentally friendly active nanocatalyst for degradation of MB present in aquatic environment.

scholarly journals Heavy Metal Adsorption ontoKappaphycussp. from Aqueous Solutions: The Use of Error Functions for Validation of Isotherm and Kinetics Models

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Md. Sayedur Rahman ◽  
Kathiresan V. Sathasivam
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Aqueous Solutions ◽  
Kinetic Models ◽  
Adsorption Process ◽  
Low Cost ◽  
Metal Adsorption ◽  
Red Seaweed ◽  
Error Functions ◽  
Removal Of Heavy Metals

Biosorption process is a promising technology for the removal of heavy metals from industrial wastes and effluents using low-cost and effective biosorbents. In the present study, adsorption of Pb2+, Cu2+, Fe2+, and Zn2+onto dried biomass of red seaweedKappaphycussp. was investigated as a function of pH, contact time, initial metal ion concentration, and temperature. The experimental data were evaluated by four isotherm models (Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich) and four kinetic models (pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models). The adsorption process was feasible, spontaneous, and endothermic in nature. Functional groups in the biomass involved in metal adsorption process were revealed as carboxylic and sulfonic acids and sulfonate by Fourier transform infrared analysis. A total of nine error functions were applied to validate the models. We strongly suggest the analysis of error functions for validating adsorption isotherm and kinetic models using linear methods. The present work shows that the red seaweedKappaphycussp. can be used as a potentially low-cost biosorbent for the removal of heavy metal ions from aqueous solutions. Further study is warranted to evaluate its feasibility for the removal of heavy metals from the real environment.

Biosorption of heavy metals from aqueous solutions onto peanut shell as a low-cost biosorbent

Desalination ◽  
2011 ◽  
Vol 265 (1-3) ◽  
pp. 126-134 ◽  
Author(s):  
Anna Witek-Krowiak ◽  
Roman G. Szafran ◽  
Szymon Modelski
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Low Cost ◽  
Peanut Shell ◽  
Biosorption Of Heavy Metals

scholarly journals Wastewater Treatment for Heavy Metals and Dyes Using Low-Cost Biosorbents: A Review

2021 ◽  
Vol 44 (2) ◽  
pp. 47-56
Author(s):  
Andreea BONDAREV
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Aqueous Solutions ◽  
Industrial Wastewater ◽  
Dye Removal ◽  
Environmental Problem ◽  
Low Cost ◽  
Sorption Kinetics ◽  
Inorganic Cations ◽  
Sustainable Wastewater Treatment

The pollution of industrial wastewater with heavy metals and dyes is a highly important environmental problem, because of the propagation of the pollution and because of its unfavourable consequences. Sustainable wastewater treatment is one of the foremost challenges of this century. Various waste materials characterized by lignocellulose composition are low cost, non-conventional adsorbent for biosorptive removal of heavy metal ions from aqueous solutions. Recent studies point to the potential of use of low-cost materials (zeolites, carrot residue and green tea waste) as effective sorbents for the removal of Cd2+ from aqueous solution. The use of bentonite to the treatment of wastewater containing reactive dyes in aqueous solutions requires the modification of the hydrophilic surface by inorganic cations with organic cations exchange. The use of bentonite as an inexpensive sorbent for the removal of Remazol Brilliant Blue R (RBBR) from synthetic aqueous solutions has been also presented in recent studies. The influence of some parameters such as: pH, initial dye concentration, sorbent dose on sorption kinetics for dye removal has been reviewed in this paper.

Inorganic polymers of ground waste concrete and industrial waste slags as a low-cost sorbent of heavy metals

2021 ◽  
Author(s):  
Aikaterini Vavouraki
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Environmental Remediation ◽  
Low Cost ◽  
Cementitious Materials ◽  
Added Value ◽  
Sustainable Construction ◽  
Alkali Activation ◽  
Inorganic Polymers ◽  
Waste Concrete

&lt;p&gt;Inorganic polymers (IPs) are alkali activated aluminosilicate materials. Research on the synthesis of alternative cementitious materials such as IPs receives substantial attention not only for their physico-chemical properties that they acquire but for being cost-effective components of the future toolkit of sustainable construction materials (&lt;strong&gt;Provis, 2018; Vavouraki, 2020&lt;/strong&gt;). In addition to potential uses of alkali activation materials for the disposal of industrial solid wastes and by-products, there is a great scientific interest in deploying IPs for environmental remediation purposes (&lt;strong&gt;Rasaki et al., 2019&lt;/strong&gt;). In particular IPs can possess application value in pollution treatment of immobilization of toxic (and/ or nuclear) wastes, both inorganics and organics (&lt;strong&gt;Ji &amp; Pei, 2019&lt;/strong&gt;). Green sustainable aluminosilicate-based adsorbents may facilitate the elimination of toxic metal and organic pollutants from water and/ or wastewater (&lt;strong&gt;Tan et al., 2020&lt;/strong&gt;). IPs are considered low-cost sorbents not only for successful recycling of waste materials but also considering added-value materials for the removal of heavy metals from aqueous solutions. However limited number of studies examines waste-slag-based IPs for the removal capacity of heavy metals.&lt;/p&gt;&lt;p&gt;The aim of this study is to synthesize IPs from ground waste concrete and industrial slags and investigate their uptake capacity for heavy metals from aqueous solutions. The calcite-bearing and industrial-slags IPs as sorbent materials were examined for the uptake of solely Cu(II), Zn(II) and, Pb(II) and also or along with competitive aqueous solutions. Kinetics and equilibrium experiments were performed and analytical techniques involving XRF, XRD, FTIR, SEM/ EDS and XPS were used for the characterization and morphology analysis of the produced IPs.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;References:&amp;#160;&lt;/strong&gt;Ji &amp; Pei, 2019. J. Environ. Manage. 231, 256&amp;#8211;267; Provis, 2018. Cem. Concr. Res. 114, 40&amp;#8211;48; Rasaki et al., 2019. J. Clean. Prod. 213, 42&amp;#8211;58; Tan et al., 2020. Environ. Technol. Innov. 18, 100684; Vavouraki, 2020. J. Sustain. Metall. 6, 383&amp;#8211;399.&lt;/p&gt;

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