scholarly journals Mechanisms of Adsorption of Heavy Metal Cations from Waters by an Amino Bio-Based Resin Derived from Rosin

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 969 ◽  
Author(s):  
Wanting Huang ◽  
Kaisheng Diao ◽  
Xuecai Tan ◽  
Fuhou Lei ◽  
Jianxin Jiang ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Critical Role ◽  
Freundlich Isotherm ◽  
Exchange Capacity ◽  
Natural Material ◽  
Multicomponent Systems ◽  
Adsorption Mechanisms ◽  
Heavy Metal Cations ◽  
13C Nuclear Magnetic Resonance ◽  
Routine Removal

Rosin derived from conifer trees is used as the basis for a novel environmentally-friendly adsorbent prepared from a sustainable resource. After treatment with ethylenediamine, ethylenediamine rosin-based resin (EDAR) is produced, which possesses cation exchange capacity that is comparable to that of the best commercial synthetic resins. This is demonstrated by its application to the removal of Pb, Cd, and Cu from water, in single and multicomponent systems. Maximum uptake was obtained at pH 5 and in the order Pb(II) > Cd(II) > Cu(II). The maximum adsorption of Pb was ~1.8 mmol/g, but the adsorption process resembled the Freundlich isotherm, whereas the adsorption of Cd(II) and Cu(II) followed the Langmuir isotherm. In the multicomponent systems, there was direct competition between Pb and Cd for sorption sites, whereas the results with Cu indicated it had a preference for different types of sites compared to Pb and Cd. The EDAR resin could be efficiently regenerated and used repeatedly with only a small decrease in performance. Characterization of EDAR, and investigations of its adsorption mechanisms using physical, spectroscopic, and theoretical techniques, including fourier transform infrared spectroscopy (FTIR), 13C nuclear magnetic resonance (13C NMR), scanning electron microscope (SEM), Brunauer Emmett Teller (BET) method, elemental analysis, thermogravimetric analysis (TGA), and molecular dynamics calculations, showed that amino groups have a critical role in determining the cation adsorption properties. We conclude that this new adsorbent derived from an abundant natural material has the potential to make valuable contributions to the routine removal of heavy metal ions (HMs) from drinking water and wastewater.

scholarly journals Sorption of heavy metal cations on rhyolitic and andesitic bentonites from Central Slovakia

2010 ◽  
Vol 61 (2) ◽  
pp. 163-171 ◽  
Author(s):  
Slávka Andrejkovičová ◽  
Martin Pentrák ◽  
L'uboš Jankovič ◽  
Peter Komadel
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Adsorption Process ◽  
Metal Cations ◽  
Interlayer Spacing ◽  
Exchange Capacity ◽  
Exchangeable Cations ◽  
Freundlich Model ◽  
Heavy Metal Cations ◽  
Slovak Bentonites

Sorption of heavy metal cations on rhyolitic and andesitic bentonites from Central SlovakiaThe main purpose of this work was to determine adsorption characteristics of heavy metal cations on two Slovak bentonites. Adsorption of Pb2+, Zn2+, Cu2+and Cd2+on Jelšový Potok (JP) and Lieskovec (L) bentonites was studied by the batch equilibration technique using solutions of different concentrations. Higher smectite content (81 mass %) and higher cation exchange capacity (CEC) (105 mmol M+/100 g) of JP bentonite cause higher adsorption of all heavy metals in comparison with L bentonite. JP adsorbed heavy metals in the order Pb2+» Cd2+> Zn2+> Cu2+while sorption on L was slightly different, Pb2+» Cd2+> Cu2+≥ Zn2+. The Freundlich model of adsorption is more appropriate for adsorption of Pb2+and Cd2+while lower uptake of Cu2+and Zn2+is better described by the Langmuir model. Negative ΔG° values indicate that the adsorption process of all cations on both bentonites is feasible, spontaneous and exothermic. The decrease in thed001spacings from 14.8-14.9 Å in natural dominantly Ca2+-saturated samples to 13.2-12.6 Å for both bentonites saturated with four heavy metal cations shows the effect of less hydrated exchangeable cations on interlayer spacing. Jelšový Potok bentonite of higher montmorillonite content and greater CEC is the more effective candidate for removal of Pb2+, Zn2+, Cu2+and Cd2+from waste water than Lieskovec bentonite.

scholarly journals Sorption of heavy metal cations on sediments of the central depression of the Barents Sea

2019 ◽  
Vol 489 (4) ◽  
pp. 399-404
Author(s):  
G. V. Novikov ◽  
A. P. Lisitsyn ◽  
G. I. Sychkova
Keyword(s):  
Heavy Metal ◽  
Barents Sea ◽  
Metal Cations ◽  
Exchange Capacity ◽  
Absorption Capacity ◽  
Metal Salts ◽  
Heavy Metal Cations ◽  
The Barents Sea ◽  
Central Depression ◽  
Equilibrium Exchange

The article presents data on the study of the sorption of heavy metal cations on the sediments of the Central depression of the Barents Sea. Experiments were carried out on sediments of natural humidity and after removal of silt water from them, on separate classes of size of sediments. The maximum values of the equilibrium exchange capacity of sediments containing and not containing silt water practically coincide with each other. Сapacity increases in the range (Mn Ni Zn Cd) (Pb Cu) and ranges from 0,30 Mn to 0,71 Cu mg-eqv/g. According to the obtained values of the sediment capacity belong to the class of adsorbents. The influence of size, mineral composition of sediments and concentration of solutions of metal salts on the absorption capacity of sediments was studied. It is concluded that sediments can be considered as cleaners and pollutants of marine waters.

scholarly journals A Review of Adsorbents for Heavy Metal Decontamination: Growing Approach to Wastewater Treatment

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4702
Author(s):  
Archana Gupta ◽  
Vishal Sharma ◽  
Kashma Sharma ◽  
Vijay Kumar ◽  
Sonal Choudhary ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Physical Adsorption ◽  
Treatment Strategies ◽  
Freundlich Isotherm ◽  
Sorption Kinetics ◽  
Contamination Level ◽  
Adsorption Mechanisms ◽  
Solute Uptake ◽  
Pseudo Second Order ◽  
Recommended Level

Heavy metal is released from many industries into water. Before the industrial wastewater is discharged, the contamination level should be reduced to meet the recommended level as prescribed by the local laws of a country. They may be poisonous or cancerous in origin. Their presence does not only damage people, but also animals and vegetation because of their mobility, toxicity, and non-biodegradability into aquatic ecosystems. The review comprehensively discusses the progress made by various adsorbents such as natural materials, synthetic, agricultural, biopolymers, and commercial for extraction of the metal ions such as Ni2+, Cu2+, Pb2+, Cd2+, As2+ and Zn2+ along with their adsorption mechanisms. The adsorption isotherm indicates the relation between the amount adsorbed by the adsorbent and the concentration. The Freundlich isotherm explains the effective physical adsorption of the solute particle from the solution on the adsorbent and Langmuir isotherm gives an idea about the effect of various factors on the adsorption process. The adsorption kinetics data provide valuable insights into the reaction pathways, the mechanism of the sorption reaction, and solute uptake. The pseudo-first-order and pseudo-second-order models were applied to describe the sorption kinetics. The presented information can be used for the development of bio-based water treatment strategies.

scholarly journals Potential mechanisms involving the immobilization of Cd, As and Cr during swine manure composting

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Hao-Nan Guo ◽  
Li-Xia Wang ◽  
Hong-Tao Liu
Keyword(s):  
Cation Exchange Capacity ◽  
Physicochemical Parameters ◽  
Redundancy Analysis ◽  
Critical Role ◽  
Swine Manure ◽  
Exchange Capacity ◽  
Bulking Agent ◽  
Initial Carbon ◽  
Acid Ratio ◽  
The Relationship

Abstract This study aims to investigate the relationship between key physicochemical parameters related to composting process and bioavailability of Cd, As and Cr during swine manure composting through regulating different initial carbon to nitrogen (C/N) ratios (15:1, 20:1, 25:1) and bulking agent types (straw, green waste). Results showed that higher initial C/N ratio of 20:1 or 25:1 and straw as bulking agent were optimal to reduce the bioavailability of Cd, As and Cr (62.4%, 20.6% and 32.2% reduction, respectively). Redundancy analysis implied that the bioavailability of Cd was significantly associated with total phosphorus and total nitrogen, deducing the formation of phosphate precipitation and biosorption might participated in the reaction process, while that of As and Cr were mainly influenced by organic matter (OM), cation exchange capacity (CEC) and OM, CEC, electric conductivity, respectively. A total of 48.5%, 64.6% and 62.2% of Cd, As and Cr redistribution information could be explained by the above parameters. Further correlation analysis revealed that bioavailable As and Cr were negatively correlated with humic acid to fulvic acid ratio. In summary, this study confirms that the mechanisms of phosphate precipitation, biosorption and humification played critical role in reducing Cd, As and Cr bioavailability during swine manure composting.

Heavy metal ions retention by bi-functionalized lignin: Synthesis, applications, and adsorption mechanisms

2014 ◽  
Vol 20 (6) ◽  
pp. 4429-4436 ◽  
Author(s):  
Yuanyuan Ge ◽  
Zhili Li ◽  
Yan Kong ◽  
Quanpeng Song ◽  
Kunqi Wang
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Adsorption Mechanisms ◽  
Lignin Synthesis

scholarly journals Novel phthalonitrile derivatives as potential compounds for extraction and complexation of metal cations

2016 ◽  
Vol 11 (10) ◽  
pp. 3870-3874
Author(s):  
Lassaad Baklouti
Keyword(s):  
Heavy Metal ◽  
Transition Metal ◽  
Metal Cations ◽  
Uv Spectra ◽  
Transition Metal Cations ◽  
Binding Properties ◽  
Heavy Metal Cations ◽  
Uv Visible ◽  
The Stability ◽  
Ligand Species

The synthesis and the binding properties of novel phthalonitrile derivatives 1-3 towards metal cations have been described in this paper. The complexation and extraction of some transition and heavy metal cations have been followed by UV-visible spectrophotometry absorption in methanol. The conductivity studies have been used in order to confirm complex’s stoichiometries. The treatment of UV spectra by digital program showed the formation of ML (with ML2 in some cases) (M=metal, L=ligand) species. Beyond the discussion of the stability profiles of complexes particular attention is paid to the selectivity towards Cu2+ in the 1st sequence of transition metal cations and towards Hg2+ in the sequence of heavy metal cations.

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