scholarly journals Adsorption and Separation of Crystal Violet, Cerium(III) and Lead(II) by Means of a Multi-Step Strategy Based on K10-Montmorillonite

Minerals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 466 ◽  
Author(s):  
Filippo Parisi
Keyword(s):  
Metal Ions ◽  
Cation Exchange ◽  
Crystal Violet ◽  
Metal Ion ◽  
Complete Removal ◽  
Experimental Conditions ◽  
Factors Affecting ◽  
Adsorption Processes ◽  
Removal Of Metal Ions ◽  
Time Required

A multi-step procedure, based on the employment of K10-Montmorillonite, is proposed for the selective removal of metal ions and dyes from a multicomponent solution. The objective is twofold: decontaminate the effluents and separate and recover the valuable byproducts present in wastewaters. Three common contaminants, i.e., crystal violet dye (CV), Ce(III) and Pb(II) were chosen as “model” pollutants. The main factors affecting the pollutants’ sorption were investigated. The experimental data were correlated with adsorption isotherms and kinetic models to obtain a deeper insight into the adsorption processes. The affinity of the clay toward the pollutants is favored by an increasing pH and follows the order CV > Pb(II) > Ce(III). Whereas Ce(III) metal ions do not adsorb onto clay under strongly acidic conditions, both Pb(II) and CV can adsorb under all the investigated pH conditions. The analysis of isotherms and kinetic profiles revealed that CV adsorbs onto clay through a mechanism consisting of two parallel processes, namely cation exchange on the external mineral surface and in the interlayer and surface complexation at the edge sites, while metal ion uptake is due solely to cation exchange processes involving mineral surfaces. The time required for the complete removal of pollutants follows the order CV > Ce(III) >> Pb(II). The possibility to modulate the adsorption features by changing experimental conditions was successfully employed to propose the best strategy for the progressive removal of different components from aqueous solutions.

Why do zeolites induce an unprecedented electronic state on exchanged metal ions?

2017 ◽  
Vol 19 (36) ◽  
pp. 25105-25114 ◽  
Author(s):  
Akira Oda ◽  
Takahiro Ohkubo ◽  
Takashi Yumura ◽  
Hisayoshi Kobayashi ◽  
Yasushige Kuroda
Keyword(s):  
Metal Ions ◽  
Electronic State ◽  
Base Metal ◽  
Metal Ion ◽  
High Efficiency ◽  
Lewis Base ◽  
Mfi Zeolite ◽  
Adsorption Processes ◽  
Exact Position

Understanding the exact position and the detailed role of the Al array in zeolites is essential for elucidating the origin of unique properties and for designing zeolite materials with high efficiency in catalytic and adsorption processes. In this work, we advanced pivotal roles of Lewis base–metal ion bifunctionality caused by Al atoms arrayed circumferentially in the MFI-zeolite pores.

scholarly journals Molecularly Imprinted Polymers for Removal of Metal Ions: An Alternative Treatment Method

Biomimetics ◽  
2018 ◽  
Vol 3 (4) ◽  
pp. 38 ◽  
Author(s):  
Özgecan Erdem ◽  
Yeşeren Saylan ◽  
Müge Andaç ◽  
Adil Denizli
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Membrane Filtration ◽  
Polymeric Materials ◽  
Treatment Method ◽  
Terrestrial Environment ◽  
Molecularly Imprinted ◽  
Metal Ion Removal ◽  
Ion Imprinted ◽  
Removal Of Metal Ions

Aquatic and terrestrial environment and human health have been seriously threatened with the release of metal-containing wastewater by the rapid growth in the industry. There are various methods which have been used for removal of ions from the environment, such as membrane filtration, ion exchange, membrane assisted liquid extraction and adsorption. As a sort of special innovation, a polymerization technique, namely molecular imprinting is carried out by specific identification for the target by mixing it with a functional monomer. After the polymerization occurred, the target ion can be removed with suitable methods. At the end of this process, specific cavities, namely binding sites, are able to recognize target ions selectively. However, the selectivity of the molecularly imprinted polymer is variable not only because of the type of ligand but also charge, size coordination number, and geometry of the target ion. In this review, metal ion-imprinted polymeric materials that can be applied for metal ion removal from different sources are discussed and exemplified briefly with different metal ions.

scholarly journals STUDY OF REMOVAL OF METAL IONS IN WATER USING ZEOLITES SYNTHESIZED WITH CHARCOAL ASHES

2006 ◽  
Vol 05 (3) ◽  
pp. 21-30
Author(s):  
Denise Alves FUNGARO ◽  
Juliana de Carvalho IZIDORO
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Ion Selectivity ◽  
Coal Ash ◽  
Electroplating Effluent ◽  
Zeolitic Material ◽  
Equilibrium Data ◽  
Metal Ion Selectivity ◽  
Removal Of Metal ◽  
Removal Of Metal Ions

The capacity of synthesized zeolites from Brazilian coal ash for the removal of metal ions from aqueous solutions has been investigated. Equilibrium data obtained have been found to fit both the Langmuir and Freundlich adsorption isotherms. The zeolitic material prepared with coal ash from baghouse filter showed the highest removal efficiencies. The metal ion selectivity of this product was determined as: Pb2+ > Cd2+ > Cu2+ > Zn2+ > Ni2+. The maximum cation exchange capacities were between 32.9 and 246.9 mg g-1. Tests showed that the zeolitic material was suitable for removal of zinc from electroplating effluent.

scholarly journals A Study on the Photocatalytic Reduction of Some Metal Ions in Aqueous Solution Using UV- Titanium Dioxide System

2019 ◽  
pp. 1-7
Author(s):  
I. O. Ekwere ◽  
M. Horsfall ◽  
J. O. E. Otaigbe
Keyword(s):  
Aqueous Solution ◽  
Titanium Dioxide ◽  
Metal Ions ◽  
Metal Ion ◽  
Uv Light ◽  
Kinetic Studies ◽  
Photocatalytic Reduction ◽  
Alkaline Ph ◽  
Removal Of Metal ◽  
Removal Of Metal Ions

The photocatalytic reduction of Cu (II), Pb (II), Cd (II) and Cr (VI) ions in aqueous solution has been investigated. The photocatalyst utilized was nano titanium dioxide, composed of 80% anatase and 20% rutile; the UV light source was a 15 W UV bulb with a wavelength of 254 nm. The results obtained indicated a reduction efficiency order as follows; Cr6+ > Cu2+ > Pb2+ > Cd2+. It was observed that these results correlate with the respective reduction potentials of the metal ions. The effect of pH on the photocatalytic reduction of the metal ions was also carried out and results obtained indicated that with the exception of Cr (VI) ions, higher percentage removal of metal ions from their aqueous solution was recorded at alkaline pH than at acidic pH. This was attributed to an extensive formation of precipitate by the metal ions at alkaline pH. Kinetic studies revealed that the removal of metal ions from their solutions largely followed the pseudo- first-order kinetics. Therefore, the results of this study will be useful in metal ion removal from industrial waste water using photocatalytic process.

Rate-limited cation exchange in thin bentonitic barrier layers

2006 ◽  
Vol 43 (4) ◽  
pp. 370-391 ◽  
Author(s):  
Ho Young Jo ◽  
Craig H Benson ◽  
Tuncer B Edil
Keyword(s):  
Cation Exchange ◽  
Chemical Equilibrium ◽  
Pore Space ◽  
Compartment Model ◽  
Monovalent Cation ◽  
Thin Layers ◽  
Dry Density ◽  
Factors Affecting ◽  
Barrier Layers ◽  
Time Required

A three-compartment model was developed for simulating cation transport in bentonitic barrier layers that incorporates diffusion-controlled cation exchange among the mobile intergranular water (bulk pore water), immobile interparticle and interlayer water, and the montmorillonite mineral solid. Exchange on the external surfaces and interlayer region of montmorillonite is included. The model was evaluated for divalent-for-monovalent cation exchange in bentonite with experiments. A parametric study was conducted using the model to investigate factors affecting the time required to establish chemical equilibrium (i.e., completion of cation exchange) between the permeant liquid and thin layers of bentonite simulating geosynthetic clay liners (GCLs). Predictions obtained with the model were in general agreement with the data without calibration, except for Na concentrations in the effluent at very long times. Parametric simulations conducted with the model show that the time required to establish chemical equilibrium in GCLs is affected by the rate at which adsorbing cations are delivered to the pore space (affected by seepage velocity or influent concentration), the rate of mass transfer between the mobile and immobile liquid phases (controlled primarily by granule size of the bentonite), and the number of sites available for sorption (controlled by CEC and the dry density of the bentonite).Key words: bentonite, montmorillonite, exchange complex, diffusion, immobile liquid, interlayer.

scholarly journals A Fixed-Bed Column Study for Removal of Organic Dyes from Aqueous Solution by Pre-Treated Durian Peel Waste

2019 ◽  
Vol 19 (2) ◽  
pp. 486 ◽  
Author(s):  
Nguyen Thi Thuong ◽  
Nguyen Thi Tuyet Nhi ◽  
Vo Thi Cam Nhung ◽  
Hoang Ngoc Bich ◽  
Bui Thi Phuong Quynh ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Flow Rate ◽  
Crystal Violet ◽  
Organic Dyes ◽  
Fixed Bed ◽  
Complete Removal ◽  
Breakthrough Curves ◽  
Experimental Conditions ◽  
Fixed Bed Column ◽  
Efficient Treatment

A number of harmful effects on the ecosystem, the life of humankind, and living species caused by dye-contaminated wastewater have urged the development for an efficient and cost-efficient treatment method for colored effluents. The cellulose-based adsorbents have been considered as a facile and efficient approach to remove hazardous pollutants because of the abundance of inexpensive agricultural wastes in Viet Nam. This study aims to investigate the elimination of methylene blue (MB) and crystal violet (VL) from wastewater using a fixed-bed column of pre-treated durian peel. Examined variables in the process are bed depths (2–6 cm), flow rate (5–20 mL/min), and influent dye concentrations (200–600 mg/L). The highest adsorption amount of pre-treated DP was 235.80 mg/g and 527.64 mg/g, respectively, on a 600 mg/L of methylene blue and crystal violet achieved within a bed height of 4 cm and a flow rate of 10 mL/min. Accordingly, the breakthrough curves were constructed and modeled using the relevant theoretical models under the effects of different experimental conditions. Pre-treated durian peel was found to exhibit high adsorption capacity for cationic dye in an initial concentration of 200–600 mg/L with complete removal being obtained.

scholarly journals Optimisation and Modelling of Pb (II) and Cu (II) Biosorption onto Red Algae (Gracilaria changii) by Using Response Surface Methodology

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2325 ◽  
Author(s):  
Mubeen Isam ◽  
Lavania Baloo ◽  
Shamsul Rahman Mohamed Kutty ◽  
Saba Yavari
Keyword(s):  
Response Surface Methodology ◽  
Metal Ions ◽  
Response Surface ◽  
Metal Ion ◽  
Ion Concentration ◽  
Solution Ph ◽  
Gracilaria Changii ◽  
Red Macroalgae ◽  
Removal Of Metal ◽  
Removal Of Metal Ions

The removal of Pb (II) and Cu (II) ions by using marine red macroalgae (Gracilaria changii) as a biosorbent material was evaluated through the batch equilibrium technique. The effect of solution pH on the removal of metal ions was investigated within the range of 2–7. The response surface methodology (RSM) technique involving central composite design (CCD) was utilised to optimise the three main sorption parameters, namely initial metal ion concentration, contact time, and biosorbent dosage, to achieve maximum ion removal. The models’ adequacy of response was verified by ANOVA. The optimum conditions for removal of Pb (II) and Cu (II) were as follows: pH values of 4.5 and 5, initial concentrations of 40 mg/L, contact times of 115 and 45 min, and biosorbent dosage of 1 g/L, at which the maximum removal percentages were 96.3% and 44.77%, respectively. The results of the adsorption isotherm study showed that the data fitted well with the Langmuir’s model for Pb (II) and Cu (II). The results of the adsorption kinetic study showed that the data fitted well with the pseudo-second order model for Pb (II) and Cu (II). In conclusion, red alga biomass exhibits great potential as an efficient low-cost sorbent for removal of metal ions.

Preparation of a Novel Adsorbent and Heavy Metal Ion Adsorption

2014 ◽  
Vol 9 (4) ◽  
pp. 155892501400900 ◽  
Author(s):  
Chuanfeng Zang ◽  
Desuo Zhang ◽  
Jiaqing Xiong ◽  
Hong Lin ◽  
Yuyue Chen
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Hyperbranched Polymer ◽  
Metal Ion ◽  
Ion Concentration ◽  
Cotton Fibers ◽  
Practical Applications ◽  
Metal Ion Adsorption ◽  
Ft Ir ◽  
Removal Of Metal Ions

The article focuses on the preparation of a novel adsorbent by grafting amino-terminated hyperbranched polymer to cotton fibers and the adsorption of heavy metal ions from aqueous solution. The prepared novel adsorbent was characterized by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The experimental results show that the amino-terminated hyperbranched polymer was grafted to the oxidized cotton fibers, and the adsorbent with amino-terminated hyperbranched polymer was successfully obtained. The grooves on the surface of the grafted cotton fiber were filled with amino-terminated hyperbranched polymer. The adsorption experiments show that the adsorption amount of Cu2+ and Pb2+ was up to 16.1 mg/g and 13.4 mg/g with the metal ion concentration of 319.5 ppm and 315.9 ppm, respectively. When the dosage of adsorbent was 1.5 g in 100 mL metal ion solution, the adsorption rate of Cu2+ and Pb2+ reached 73.5 wt. % and 71.2 wt.%, respectively. The use of the adsorbent for the removal of metal ions is considered to be efficient and have great potential for practical applications.

Research on Metal Ion Removal of Ceramic Printing Wastewater

2013 ◽  
Vol 664 ◽  
pp. 369-373 ◽  
Author(s):  
Ling Ling Shang ◽  
Ce Shi ◽  
Yong Li Zhang ◽  
Yong Min Liu
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Removal Rate ◽  
Iron Removal ◽  
Reaction Cell ◽  
Solution Ph ◽  
Flame Atomic Absorption ◽  
Removal Of Metal ◽  
Removal Of Metal Ions

The removal of the metal ions in the ceramic printing wastewater was influenced by using, stirring and precipitating of the solution pH, coagulant PAC, coagulant aid PAM and heavy metal scavenger. This experiment investigated the removal effect of the metal ions in the wastewater under different conditions. Flame atomic absorption spectrometry was adopted for the determination of the concentration of metal ions in the wastewater. The studies have shown that alkalization, PAC coagulation treatment have a role in the removal of metal ions in the ceramic printing wastewater. And the chromium and iron removal rate can reached 74.0% and 61.6% respectively. Heavy metal scavenger also have a better role in the removal of metal ions. And the chromium and iron removal rates were 82.3% and 76.2% respectively without dosing PAC. The number of reaction cell has no significant effect on the removal of metal ions.

scholarly journals Preparation of a Modified PTFE Fibrous Photo-Fenton Catalyst and Its Optimization towards the Degradation of Organic Dye

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Zhizhong Ding ◽  
Yongchun Dong ◽  
Bing Li
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Metal Content ◽  
Dye Degradation ◽  
Fiber Surface ◽  
Transition Metal Ions ◽  
Rare Metal ◽  
Catalytic Performance ◽  
Factors Affecting ◽  
Grafting Degree

Polytetrafluoroethylene (PTFE) fiber was grafted with acrylic acid to impart the carboxyl groups onto the fiber surface, which were used to coordinate with both transition metal ions Fe(III) and Cu(II) and a rare metal ion Ce(III) to prepare the metal grafted PTFE fiber complexes as the novel heterogeneous Fenton catalysts for the degradation of the azo dye in water under visible irradiation. Some factors affecting the preparation process, such as nature and concentration of metal ions in the coordination solution, grafting degree of PTFE and reaction temperature were optimized with respect to the content and strength of metal fixation on the fiber and dye degradation efficiency. The results indicated that increasing metal ion concentrations in solution and grafting degree of PTFE fiber as well as higher coordination temperature led to a significant increase in metal content, especially Fe(III) and Cu(II) content of the complexes. Fe(III) ions fixed on the fiber showed the better catalytic performance than Cu(II) and Ce(III) ions fixed when three different complexes with similar metal content being employed, respectively. Moreover, Increasing Fe content or incorporation of Cu(II) ions could significantly improve the catalytic activity of the complexes.

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