Differential adsorption of heavy metal ions by cotton stalk cation-exchangers containing multiple functional groups

2006 ◽  
Vol 101 (6) ◽  
pp. 4124-4132 ◽  
Author(s):  
A. M. A. Nada ◽  
N. A. El-Wakil ◽  
M. L. Hassan ◽  
A. M. Adel
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Functional Groups ◽  
Heavy Metal Ions ◽  
Cotton Stalk ◽  
Cation Exchangers

THE STUDY OF THE REACTION BETWEEN CHITOSAN AND MELAMINE DERIVATIVE

2020 ◽  
Vol 54 (1 (251)) ◽  
pp. 83-85
Author(s):  
M.L. Yeritsyan ◽  
K.M. Yeritsyan ◽  
V.M. Mavisakalyan ◽  
A.M. Arustamyan ◽  
R.P. Mkhitaryan
Keyword(s):  
Heavy Metal ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Functional Groups ◽  
Heavy Metal Ions ◽  
Chitosan Derivative

The reaction between urea and melamine was studied. The reaction resulted in tris-carbamide derivative of melamine. During the reaction between the melamine derivative and the glycoside group of chitosan the sim-triazine functional groups were formed, which are included in the structure of synthesized derivative of chitosan. The synthesized derivative of chitosan was tested. It is recommended to use this chitosan derivative as an absorbent for the separation of heavy metal ions such as Cd2+, Hg1+, Hg2+, Co2+, Ag1+, As3+, As5+, etc. from the aqueous solutions of salts.

scholarly journals Bioremediation of Chromium by Microorganisms and Its Mechanisms Related to Functional Groups

2021 ◽  
Vol 2021 ◽  
pp. 1-21
Author(s):  
Abate Ayele ◽  
Yakob Godebo Godeto
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Ions ◽  
Functional Groups ◽  
Heavy Metal Ions ◽  
Future Research ◽  
Oil Well ◽  
Toxic Heavy Metals ◽  
Toxic Heavy Metal ◽  
Minimum Concentration

Heavy metals generated mainly through many anthropogenic processes, and some natural processes have been a great environmental challenge and continued to be the concern of many researchers and environmental scientists. This is mainly due to their highest toxicity even at a minimum concentration as they are nonbiodegradable and can persist in the aquatic and terrestrial environments for long periods. Chromium ions, especially hexavalent ions (Cr(VI)) generated through the different industrial process such as tanneries, metallurgical, petroleum, refractory, oil well drilling, electroplating, mining, textile, pulp and paper industries, are among toxic heavy metal ions, which pose toxic effects to human, plants, microorganisms, and aquatic lives. This review work is aimed at biosorption of hexavalent chromium (Cr(VI)) through microbial biomass, mainly bacteria, fungi, and microalgae, factors influencing the biosorption of chromium by microorganisms and the mechanism involved in the remediation process and the functional groups participated in the uptake of toxic Cr(VI) from contaminated environments by biosorbents. The biosorption process is relatively more advantageous over conventional remediation technique as it is rapid, economical, requires minimal preparatory steps, efficient, needs no toxic chemicals, and allows regeneration of biosorbent at the end of the process. Also, the presence of multiple functional groups in microbial cell surfaces and more active binding sites allow easy uptake and binding of a greater number of toxic heavy metal ions from polluted samples. This could be useful in creating new insights into the development and advancement of future technologies for future research on the bioremediation of toxic heavy metals at the industrial scale.

Adsorptive removal of heavy metal ions using graphene-based nanomaterials: Toxicity, roles of functional groups and mechanisms

Chemosphere ◽  
2020 ◽  
Vol 248 ◽  
pp. 126008 ◽  
Author(s):  
Siti Zu Nurain Ahmad ◽  
Wan Norharyati Wan Salleh ◽  
Ahmad Fauzi Ismail ◽  
Norhaniza Yusof ◽  
Mohd Zamri Mohd Yusop ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Functional Groups ◽  
Heavy Metal Ions ◽  
Adsorptive Removal

scholarly journals Functionalized layered double hydroxide applied to heavy metal ions absorption: A review

2020 ◽  
Vol 9 (1) ◽  
pp. 800-819 ◽  
Author(s):  
Zhen Tang ◽  
Zedong Qiu ◽  
Shuang Lu ◽  
Xianming Shi
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Functional Groups ◽  
Layered Double Hydroxide ◽  
Heavy Metal Ions ◽  
Absorption Capacity ◽  
Hydroxyl Group ◽  
Synthesis Methods ◽  
Structural Components ◽  
Double Hydroxide

AbstractThe use of functional material can help mitigate the pollution by heavy metals, which presents an array of risks to human production and life. This work provides a comprehensive review of the current knowledge on functionalized layered double hydroxide (LDH) as a heavy metal absorption material, by synthesizing the information from a total of 141 relevant publications published since 2005. LDH provides a potentially highly efficient method to adsorb heavy metal ions, which is simple to prepare and of low cost. The lack of functional groups and structural components of pristine LDH, however, limits the absorption capacity and widespread applications of LDH. Through intercalation, surface modification, or loading on substrates, functional groups or structural components are introduced into the pristine LDH to prepare functionalized LDH. In this process, the hydroxyl group and the valence state of [Mg(OH)6] octahedrons play a crucial role. Functionalized LDH can be endowed with selective absorption capacity and enhanced stability and recyclability. After adsorbing heavy metal ions, functionalized LDH can be readily separated from the liquid phase. These aspects are discussed, along with the structure and composition, shape and size, and synthesis methods and research tools of LDH. This work concludes with the discussion of preparation and utilization and a look to the future in terms of identified research needs regarding the preparation, use, and recycling (or upcycling) of economical and environmental-friendly LDH.

scholarly journals Sorption of Heavy Metal Ions by Composite Materials Based on Polycarboxylic Acids and Bentonite Clay

2021 ◽  
Vol 23 (1) ◽  
pp. 19
Author(s):  
Sh. N. Zhumagaliyeva ◽  
R. S. Iminovа ◽  
G. Zh. Kairalapova ◽  
B. M. Kudaybergenova ◽  
Zh. A. Abilov
Keyword(s):  
Heavy Metal ◽  
Composite Materials ◽  
Metal Ions ◽  
Functional Groups ◽  
Heavy Metal Ions ◽  
Bentonite Clay ◽  
Clay Content ◽  
Composite Gels ◽  
Polycarboxylic Acids ◽  
Study Results

The paper shows the study results of sorption capacities of composite gels based on polyacrylic and polymethacrylic acids with bentonite clay as the mineral filler concerning heavy metal ions (Pb+2, Cu+2, Ni+2, Zn+2, Fe+2, Cd+2). The binding of metal ions to gels occurs through the formation of electrostatic bonds between the charged surface of bentonite clay and ionogenic functional groups of polymers in the composition, as well as the coordination bonds between metal ions and unshared pairs of oxygen electrons in the functional groups of polymers. The gel swelling degree decreases in metal solutions with increasing metals concentration and the content of BC in the composite. The sorption and desorption of heavy metal ions from the polymer-clay composites from model solutions and samples of industrial wastewater from the Kazakhstani metallurgical plants were evaluated. The adjustment of the pH, the temperature of the medium and the clay content in the composite leads to increasing the degree of sorption and achieving regeneration of the used composite gels in certain media. The data obtained testify to the prospects of using these composites as effective sorbents of heavy metals from industrial wastewaters expanding the range of composite materials for wastewater treatment.

scholarly journals Humulus scandens-Derived Biochars for the Effective Removal of Heavy Metal Ions: Isotherm/Kinetic Study, Column Adsorption and Mechanism Investigation

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3255
Author(s):  
Xingang Bai ◽  
Luyang Xing ◽  
Ning Liu ◽  
Nana Ma ◽  
Kexin Huang ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Functional Groups ◽  
Heavy Metal Ions ◽  
Maximum Adsorption Capacity ◽  
Molten Salt Method ◽  
Oxygen Functional Groups ◽  
Effective Removal ◽  
Column Adsorption ◽  
Humulus Scandens

Humulus scandens was first adopted as a biomass precursor to prepare biochars by means of a facile molten salt method. The optimized biochar exhibits a high specific surface area of ~450 m2/g−1, a rich porous structure and abundant oxygen functional groups, which demonstrate excellent adsorption performance for heavy metal ions. The isotherm curves fit well with the Langmuir models, indicating that the process is governed by the chemical adsorption, and that the maximum adsorption capacity can reach 748 and 221 mg/g−1 for Pb2+ and Cu2+, respectively. In addition, the optimized biochar demonstrates good anti-interference ability and outstanding removal efficiency for Cu2+ and Pb2+ in simulated wastewater. The mechanism investigation and DFT calculation suggest that the oxygen functional groups play dominant roles in the adsorption process by enhancing the binding energy towards the heavy metal ions. Meanwhile, ion exchange also serves as the main reason for the effective removal.

Advanced Water Treatment Systems and Their Applications

2019 ◽  
pp. 1-18
Author(s):  
Tauseef Ahmad Rangreez ◽  
Rizwana Mobin ◽  
Hamida-Tun-Nisa Chisti ◽  
Rafia Bashir ◽  
Tabassum Ara
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Composite Material ◽  
Water Treatment ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Toxic Heavy Metal ◽  
Health And Wellbeing ◽  
Cation Exchangers ◽  
Inorganic Composite

The chapter gives an idea about water as a life-sustaining medium and the sources of its pollution along with the deteriorating effects of over burdening of natural resources and the effect of various heavy metal ions discharged into the water bodies on human health and wellbeing. Several human diseases and disorders that are caused due to intake of water polluted by toxic heavy metal ions are also listed. The need and urgency in determination and removal of heavy metal ions from the water sources in order to release load on aquifers by making water safe for reuse is emphasized. The procedure and advantages of composite cation-exchangers along with the work carried out in the field to develop various lead, cadmium, chromium, and mercury selective cation-exchangers are also included. The utility of organic-inorganic composite material for the detection of heavy metals, which render portable water unsafe for use and pose a threat to the wellbeing of man, is also discussed.

Eco-friendly floatable foam hydrogel for the adsorption of heavy metal ions and use of the generated waste for the catalytic reduction of organic dyes

Soft Matter ◽  
2020 ◽  
Vol 16 (29) ◽  
pp. 6914-6923
Author(s):  
Hui Zhao ◽  
Ying Li
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Functional Groups ◽  
Network Structure ◽  
Heavy Metal Ions ◽  
Catalytic Reduction ◽  
Organic Dyes ◽  
Three Dimensional ◽  
Dimensional Network

Benefiting from their three-dimensional network structure and various functional groups, hydrogels have emerged as efficient adsorbents for the removal of heavy metal ions from wastewater.

Comparison of surface functional groups and metal uptake efficiency of rice husk harvested from different climatic zones

2012 ◽  
Vol 65 (10) ◽  
pp. 1738-1744 ◽  
Author(s):  
Amir Hossein Matin ◽  
Shokooh Sadat Khaloo ◽  
Abbas Akbarzadeh ◽  
Mohammad Riahi
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Functional Groups ◽  
Rice Husk ◽  
Heavy Metal Ions ◽  
Metal Cations ◽  
Climatic Conditions ◽  
Water Solutions ◽  
Heavy Metal Cations ◽  
Climatic Regions

Rice husk (RH) is a very effective natural adsorbent for fast removal of heavy metal cations from water solutions. Application of RH for removal of some heavy metal ions, such as Ni, Zn, Mn, Co, Cu, Pb and Cd from water solutions has been studied and different maximum adsorption capacities and a variety of optimized conditions were reported in the literature. In this work, the efficiency of RH harvested from different climatic regions was studied. For this proposal, different RH samples were collected from three different climatic regions of Iran (nominated as RH1 to RH3); their removal efficiencies of heavy metal cations of Ni2+, Cu2+ and Cd2+ were investigated and compared. The adsorption data at optimum conditions could be assessed well by both Langmuir and Freundlich models. Statistical analysis of the results of adsorption isotherms showed that different RH samples have different efficiencies in uptake of these heavy metal ions. The RH samples were characterized using Fourier transform infrared spectroscopy and Boehm titration, which indicated that amounts of functional groups differed between RHs that are grown in different climatic conditions.

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