Aluminosilicate-based adsorbent in equimolar and non-equimolar binary-component heavy metal removal systems

2015 ◽  
Vol 72 (12) ◽  
pp. 2166-2178 ◽  
Author(s):  
Meng Xu ◽  
Pejman Hadi ◽  
Chao Ning ◽  
John Barford ◽  
Kyoung Jin An ◽  
...  
Keyword(s):  
Metal Ion ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Threshold Value ◽  
Industrial Applications ◽  
Molar Ratio ◽  
Toxic Heavy Metals ◽  
Component System ◽  
Molar Ratios ◽  
Adsorption Sites

Cadmium (Cd) and lead (Pb) are toxic heavy metals commonly used in various industries. The simultaneous presence of these metals in wastewater amplifies the toxicity of wastewater and the complexity of the treatment process. This study has investigated the selective behavior of an aluminosilicate-based mesoporous adsorbent. It has been demonstrated that when equimolar quantities of the metals are present in wastewater, the adsorbent uptakes the Pb2+ ions selectively. This has been attributed to the higher electronegativity value of Pb2+ compared to Cd2+ which can be more readily adsorbed on the adsorbent surface, displacing the Cd2+ ions. The selectivity can be advantageous when the objective is the separation and reuse of the metals besides wastewater treatment. In non-equimolar solutions, a complete selectivity can be observed up to a threshold Pb2+ molar ratio of 30%. Below this threshold value, the Cd2+ and Pb2+ ions are uptaken simultaneously due to the abundance of Cd2+ ions and the availability of adsorption sites at very low Pb2+ molar ratios. Moreover, the total adsorption capacities of the adsorbent for the multi-component system have been shown to be in the same range as the single-component system for each metal ion which can be of high value for industrial applications.

Pillararenes as macrocyclic hosts: a rising star in metal ion separation

2019 ◽  
Vol 55 (55) ◽  
pp. 7883-7898 ◽  
Author(s):  
Lixi Chen ◽  
Yimin Cai ◽  
Wen Feng ◽  
Lihua Yuan
Keyword(s):  
Heavy Metal ◽  
Metal Ion ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Supramolecular Materials ◽  
Feature Article ◽  
Ion Separation

This feature article reviews the development of functionalized pillararenes as supramolecular materials for lanthanide and actinide separation and heavy metal removal.

Efficient heavy metal ion removal by triazinyl-β-cyclodextrin functionalized iron nanoparticles

RSC Advances ◽  
2015 ◽  
Vol 5 (110) ◽  
pp. 90602-90608 ◽  
Author(s):  
Amir Abdolmaleki ◽  
Shadpour Mallakpour ◽  
Sedigheh Borandeh
Keyword(s):  
Heavy Metal ◽  
Aqueous Solutions ◽  
Metal Ion ◽  
Iron Nanoparticles ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Metal Ion Removal ◽  
Ion Removal ◽  
Heavy Metal Ion Removal ◽  
Nano Adsorbent

A novel magnetic nano-adsorbent containing Fe3O4 nanoparticles functionalized with MCT-β-CD was fabricated and exhibited a remarkable enhancement in heavy metal removal efficiency from aqueous solutions.

scholarly journals Bioremoval of Different Heavy Metals in Industrial Effluent by the Resistant Fungal Strain Aspergillus niger

2021 ◽  
Vol 20 (4) ◽  
Author(s):  
K. J. Naveen Kumar ◽  
J. Prakash
Keyword(s):  
Heavy Metals ◽  
Aspergillus Niger ◽  
Metal Binding ◽  
Metal Removal ◽  
Low Cost ◽  
Heavy Metal Removal ◽  
Industrial Effluent ◽  
Toxic Metal ◽  
Differential Pulse ◽  
Toxic Heavy Metals

Developing countries are increasingly concerned with pollution due to toxic heavy metals in the environment. Unlike most organic pollutants which can be destroyed, toxic metal ions released into the environment often persist indefinitely circulating and eventually accumulating throughout the food chain thus posing a serious threat to mankind. The use of biological materials for heavy metal removal or recovery has gained importance in recent years due to their good performance and low cost. Among the various sources, both live and inactivated biomass of organisms exhibits interesting metal binding capacities. Their complex cell walls contain high content of functional groups like amino, amide, hydroxyl, carboxyl, and phosphate which have been implicated in metals binding. In the present study, Aspergillus niger was used to analyze the metal uptake from an aqueous solution. The determination of Cu+2, Pb+2, Cd+2, Zn+2, Co-2 and Ni+2 in samples was carried out by differential Pulse Anodic Voltammetry (DPASV) and the Voltammograms. Production of oxalic acid was carried out by submerged fermentation. The organism used in the present study has the ideal properties to sequester toxic metals and grow faster.

scholarly journals Investigations Of Supported Bi- And Tri-Metallic Nzvi: Nitrate Reduction And Heavy Metal Removal

2021 ◽  
Author(s):  
◽  
Loc Tran
Keyword(s):  
Heavy Metal ◽  
Natural Water ◽  
Nitrate Reduction ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Synthetic Methods ◽  
Toxic Heavy Metals ◽  
Tem Analysis ◽  
Inorganic Substances ◽  
Cadmium Lead

<p>nZVI has been well documented as an effective reagent to remove contaminants, including organic and inorganic substances. However, the drawbacks of nZVI are agglomeration and bioaccumulation due to its magnetic property and nanosize. One of the solutions for these problems is putting nZVI on non-toxic support. Microsilicate600 (Misi), a silicate from a geothermal deposit in Rotorua, New Zealand, has been established to be useful in adsorbing nZVI. Doping nZVI with other metals to generate bimetallic and trimetallic materials is a method to increase its reactivity. These dopant metals function as catalysts in enhancing the electron transfer from Fe(0) core to contaminants. In this research project, the effect of doping metals on nZVI to generate bimetallic or trimetallic nZVI particles and effect of adsorbing these resulting particles on Misi were investigated. The reactivity of these materials towards the removal of different contaminants such as nitrate and toxic heavy metals was examined. Supported bimetallic nZVI@Misi were synthesised using different dopant metals, including Ni, Cu, Zn, and Pd. Supported trimetallic nZVI@Misi was synthesised by doping Pd and Cu on the surface of nZVI@Misi. Both supported bimetallic and trimetallic materials were prepared using different Misi preparations, contents of dopants, and synthetic methods. All these doped materials had higher reactivity than non-doped nZVI@Misi in removing nitrate. Misi that was calcined and FeOOH-coated is the most optimised-prepared support. Moreover, materials prepared via deposition method had higher reactivity in reducing nitrate than those prepared via co-reduction method. This is due to the distribution of dopant metals on nZVI, which was observed in TEM analysis. Of these materials, Ni-doped, Cu-doped, and Pd-Cu- doped nZVI@Misi were the most promising materials. They not only reduced nitrate effectively but also were not significantly affected by naturally occurring factors such as oxygen, chloride, sulfate, carbonate, and phosphate. During nitrate reduction, the generation of metal by-products was minimal. Interestingly, their reactivity in natural water was relatively similar to that in lab-prepared samples. The representative materials including supported Ni-doped, Cu-doped, and non-doped nZVI@Misi, were used for heavy metal removal. These materials effectively removed cadmium, lead, and chromium in both lab-prepared samples and natural water.</p>

scholarly journals Comparison of the experimental results with the Langmuir and Freundlich models for copper removal on limestone adsorbent

2019 ◽  
Vol 9 (8) ◽  
Author(s):  
Thair Sharif Khayyun ◽  
Ayad Hameed Mseer
Keyword(s):  
Heavy Metal ◽  
Metal Ion ◽  
High Efficiency ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Equilibrium Concentration ◽  
Freundlich Isotherm ◽  
Isotherm Model ◽  
Batch Adsorption ◽  
Empirical Constant

Abstract The purpose of this study was to investigate the possibility of the limestone as an adsorbed media and low-cost adsorbent. Batch adsorption studies were conducted to examine the effects of the parameters such as initial metal ion concentration C0, particle size of limestone DL, adsorbent dosage and equilibrium concentration of heavy metal Ce on the removal of the heavy metal (Cu) from synthetic water solution by limestone. The removal efficiency is increased with the increase in the volume of limestone (influenced by the media specific area). It has been noted that the limestone with diameter of 3.75 is the most effective size for removal of copper from synthetic solution. The adsorption data were analyzed by the Langmuir and Freundlich isotherm model. The average values of the empirical constant and adsorption constant (saturation coefficient) for the Langmuir equation were a = 0.022 mg/g and b = 1.46 l/mg, respectively. The average values of the Freundlich adsorption constant and empirical coefficient were Kf = 0.010 mg/g and n = 1.58 l/mg, respectively. It was observed that the Freundlich isotherm model described the adsorption process with high coefficient of determination R2, better than the Langmuir isotherm model and for low initial concentration of heavy metal. Also, when the values of amount of heavy metal removal from solution are predicted by the Freundlich isotherm model, it showed best fits the batch study. It is clear from the results that heavy metal (Cu) removal with the limestone adsorbent appears to be technically feasible and with high efficiency.

scholarly journals Genomic analysis of Bacillus cereus NWUAB01 and its heavy metal removal from polluted soil

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Ayansina Segun Ayangbenro ◽  
Olubukola Oluranti Babalola
Keyword(s):  
Heavy Metal ◽  
Surface Tension ◽  
Bacillus Cereus ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Gene Clusters ◽  
Industrial Applications ◽  
Luria Bertani ◽  
Biosurfactant Production ◽  
Screening Methods

AbstractMicroorganisms that display unique biotechnological characteristics are usually selected for industrial applications. Bacillus cereus NWUAB01 was isolated from a mining soil and its heavy metal resistance was determined on Luria–Bertani agar. The biosurfactant production was determined by screening methods such as drop collapse, emulsification and surface tension measurement. The biosurfactant produced was evaluated for metal removal (100 mg/L of each metal) from contaminated soil. The genome of the organism was sequenced using Illumina Miseq platform. Strain NWUAB01 tolerated 200 mg/L of Cd and Cr, and was also tolerant to 1000 mg/L of Pb. The biosurfactant was characterised as a lipopeptide with a metal-complexing property. The biosurfactant had a surface tension of 39.5 mN/m with metal removal efficiency of 69%, 54% and 43% for Pb, Cd and Cr respectively. The genome revealed genes responsible for metal transport/resistance and biosynthetic gene clusters involved in the synthesis of various secondary metabolites. Putative genes for transport/resistance to cadmium, chromium, copper, arsenic, lead and zinc were present in the genome. Genes responsible for biopolymer synthesis were also present in the genome. This study highlights biosurfactant production and heavy metal removal of strain NWUAB01 that can be harnessed for biotechnological applications.

scholarly journals Removal of chromium and Iron using mixed adsorbent for synthetic and industrial samples in a continuous column reactor

YMER Digital ◽  
2022 ◽  
Vol 21 (01) ◽  
pp. 98-111
Author(s):  
Dr. Srinivas Tadepalli ◽  
◽  
Dr. K.S.R Murthy ◽  
Dr. P Suresh Kumar ◽  
Dr. Prasanthi Kumari Nunna ◽  
...  
Keyword(s):  
Metal Ion ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Fixed Bed ◽  
Industrial Effluent ◽  
Ion Concentration ◽  
Flow Rates ◽  
Saturation Time ◽  
Bed Height ◽  
Synthetic Solution

he results of the experiments showed that bed weight, flow rate, and initial metal ion concentration all play a role in the removal of Cr (III) and Fe (II). The optimized break through curve was obtained at 36cm bed height and 10ml/min for chromium where 97.5 to 100% removal was observed at a saturation time of 500-600 min. With the increase in bed height from 12cm to 36cm, both the breakthrough and saturation times for Cr (III) increased. The break through time at 12cm, 24cm, 36cm and 10ml/min for Cr (III) were 70 min, 105 min, and 35 min respectively. The saturation time for Cr (III) at 12cm, 24cm, 36cm and 10ml/min were 460 min, 490 min, and 500 min respectively. Similarly, the break through time for Fe (II) at 12cm, 24cm, 36cm and 10ml/min were 70 min, 80 min, and 100 min respectively. At 12cm, 24cm, 36cm, and 10ml/min, the saturation time for Fe (III) was 340 minutes, 360 minutes, and 430 minutes, respectively. Overall in the column performance comparison between synthetic solution and industrial effluents for chromium, synthetic solution performance was more superior at fixed volumetric flow rates of 10 ml/min and bed heights ranging from 12 cm to 36 cm But the reverse trend was observed in case of fixed bed heights of 36 cm (150 g) and variation of volumetric flow rates from 10ml/min to 30ml/min which indicates that industrial effluent performance was superior when compared to synthetic solution for heavy metal removal.

Utilization Biomass from Bagasse Ash for Phillipsite Zeolite Synthesis

2011 ◽  
Vol 383-390 ◽  
pp. 4038-4042 ◽  
Author(s):  
Worathanakul Patcharin ◽  
Kittipalarak Sriamporn ◽  
Anusarn Kanokkan
Keyword(s):  
Metal Removal ◽  
Heavy Metal Removal ◽  
Value Added ◽  
Silica Content ◽  
Molar Ratio ◽  
Crystallization Time ◽  
Adsorption Method ◽  
White Ash ◽  
Silica Source ◽  
Abundant Supply

Bagasse ash is one of the agricultural wastes and valuable biomass by-products in sugar milling. It was treated hydrothermally with hydrochloric aqueous solution at 100 °C and burned at 600°C for 2 hours under oxygen feeding. The obtained white ash was further used as natural silica source instead of silica sol because of highly silica content from an abundant supply of sugar industries in Thailand. Aluminosilicate precursor gel was prepared from alumina source and silica source via sodium silicate preparation. Different crystallization time was studied for the molar ratio of SiO2/Al2O3 = 2 at 100°C crystallization temperature. The phillipsite zeolite synthesized was characterized using various techniques; X-ray diffraction, Scanning electron microscopy, Fourier Transform Infrared Spectroscopy, and BET-N2 adsorption method. The results can be used as value added for bagasse ash utilization, minimize the environmental impact of disposal problems and further application for heavy metal removal.

Recycling agriculture wastes of ramie stalk as bioadsorbents for Cd2+ removal: a kinetic and thermodynamic study

2015 ◽  
Vol 73 (2) ◽  
pp. 396-404 ◽  
Author(s):  
S. Xu ◽  
X. F. Gong ◽  
H. L. Zou ◽  
C. Y. Liu ◽  
C. L. Chen ◽  
...  
Keyword(s):  
Metal Removal ◽  
Lignin Content ◽  
Heavy Metal Removal ◽  
Complexation Reaction ◽  
Order Kinetic ◽  
Inhomogeneous Surface ◽  
Adsorption Sites ◽  
Ramie Stalk ◽  
Agriculture Wastes ◽  
High Cellulose

In this study, we exhibit the recycling of agriculture wastes of ramie stalk as bioadsorbents for Cd2+ removal. Based on our experimental results, it is realized that Cd2+ adsorption to ramie stalk is highly pH sensitive, indicating the adsorption is driven by surface complexation reaction. The high adsorption capacity of ramie stalk toward Cd2+ (qm = 10.33 mg g−1, 0.09 mol-Cd g−1), which corresponds to around 21.95% of active adsorption sites available of ramie stalk, is believed to be closely related to its high cellulose and lignin content. The inhomogeneous surface of ramie stalk due to the high cellulose and lignin content also accounts for the observation that the adsorption kinetic is described well by the pseudo second order kinetic model. Results from thermodynamic studies suggest that the adsorption process is endothermic and spontaneous. All these properties demonstrate the potential of ramie stalk as a low cost bioadsorbent for the application of heavy metal removal.

scholarly journals Polyaza macroligands as potential agents for heavy metal removal from wastewater

2013 ◽  
Vol 78 (4) ◽  
pp. 591-602 ◽  
Author(s):  
Martínez Elizondo ◽  
Martínez Nájera ◽  
Rodríguez Pérez ◽  
Hinojosa Reyes ◽  
Del Río
Keyword(s):  
Heavy Metals ◽  
Metal Ion ◽  
Metal Removal ◽  
Equilibrium Constants ◽  
Heavy Metal Removal ◽  
Industrial Effluents ◽  
Absorption Spectrometry ◽  
Spectroscopic Techniques ◽  
Metal Ion Extraction ◽  
Residual Concentration

Two polyaza macroligands N,N?-bis(2-aminobenzyl)-1,2- ethanediamine (L1) and 3,6,9,12-tetraaza-4(1,2),11(1,2)-dibenzo-1(1,3)- piridinaciclotridecafano (L2) were characterized and investigated for their metal ion extraction capabilities. The nature of all complexes was established by spectroscopic techniques. The equilibrium constants were determined by spectrophotometric and potentiometric techniques and the residual concentration of metals in the solutions by Atomic Absorption Spectrometry (AAS). The capacity of the ligands to remove heavy metals such as Cu(II), Ni(II), Cd(II), Zn(II) and Pb(II) as insoluble complexes was evaluated in wastewater from industrial effluents. These agents showed high affinity for the studied metals. The values of equilibrium constants of the isolated complexes (between 1 x 104 and 2 x 107) demonstrated the feasibility of applying these chelating agents as an alternative to remove heavy metals from industrial effluents.

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