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.

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.

A high-efficiency Fe2O3@Microalgae composite for heavy metal removal from aqueous solution

2020 ◽  
Vol 33 ◽  
pp. 101026 ◽  
Author(s):  
Li Shen ◽  
Junjun Wang ◽  
Zhanfei Li ◽  
Ling Fan ◽  
Ran Chen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
High Efficiency ◽  
Metal Removal ◽  
Heavy Metal Removal

Impact of Carbonate Hydroxylapatite (CHAP) Addition on Bio-Hydrogen Production from Microwave Pretreated Sludge

2011 ◽  
Vol 71-78 ◽  
pp. 2903-2906
Author(s):  
Liang Guo ◽  
Xiao Ming Li ◽  
Yi Zhou ◽  
Zong Lian She
Keyword(s):  
Heavy Metal ◽  
Hydrogen Production ◽  
High Efficiency ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Lag Time ◽  
Hydrogen Yield ◽  
Waste Sludge ◽  
Increase Rate ◽  
Carbonate Hydroxylapatite

In order to promote the hydrolysis and disintegration of waste sludge, the most logical approach is pretreatments to disrupt the microbial cells of sludge. After microwave pretreatments, the heavy metal which were toxicity to H2 production were released from waste sludge, and the increase rate was 10.6 (Cu), 5.5(Cd), 3.6(Zn) and 1.6 (Ni) times after pretreatment. Carbonate hydroxylapatite (CHAP) had high efficiency in heavy metal removal. In this study, the effect of heavy metal removal on bio-hydrogen production from microwave pretreated sludge using CHAP was evaluated. 0.53 g/gVSS CHAP addition could enhance the bio-hydrogen yield by 53.6% compared with control, and the lag time was 9 h. Dosages of CHAP couldinfluence the hydrolysis, fermentation type and hydrogen yield of pretreated sludge.

Synthesis and characterization of novel sulfanilic acid–polyvinyl chloride–polysulfone blend membranes for metal ion rejection

RSC Advances ◽  
2016 ◽  
Vol 6 (30) ◽  
pp. 25492-25502 ◽  
Author(s):  
Vignesh Nayak ◽  
M. S. Jyothi ◽  
R. Geetha Balakrishna ◽  
Mahesh Padaki ◽  
Arun M. Isloor
Keyword(s):  
Polyvinyl Chloride ◽  
Metal Ion ◽  
High Efficiency ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Sulfanilic Acid ◽  
Synthesis And Characterization ◽  
Ion Rejection ◽  
Blend Membranes

A novel facile method is developed for the modification of polyvinyl chloride and blend membranes are fabricated for heavy metal removal. This method is straightforward, has a high efficiency and is done at low pressure.

scholarly journals A Way to Membrane-Based Environmental Remediation for Heavy Metal Removal

Environments ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 52
Author(s):  
Catia Algieri ◽  
Sudip Chakraborty ◽  
Sebastiano Candamano
Keyword(s):  
Heavy Metal ◽  
Environmental Remediation ◽  
High Efficiency ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Scale Up ◽  
Operating Conditions ◽  
Advantages And Disadvantages ◽  
Research Activities ◽  
Key Steps

During the last century, industrialization has grown very fast and as a result heavy metals have contaminated many water sources. Due to their high toxicity, these pollutants are hazardous for humans, fish, and aquatic flora. Traditional techniques for their removal are adsorption, electro-dialysis, precipitation, and ion exchange, but they all present various drawbacks. Membrane technology represents an exciting alternative to the traditional ones characterized by high efficiency, low energy consumption and waste production, mild operating conditions, and easy scale-up. In this review, the attention has been focused on applying driven-pressure membrane processes for heavy metal removal, highlighting each of the positive and negative aspects. Advantages and disadvantages, and recent progress on the production of nanocomposite membranes and electrospun nanofiber membranes for the adsorption of heavy metal ions have also been reported and critically discussed. Finally, future prospective research activities and the key steps required to make their use effective on an industrial scale have been presented

scholarly journals Application of Chitosan/Alginate Nanocomposite Incorporated with Phycosynthesized Iron Nanoparticles for Efficient Remediation of Chromium

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2481
Author(s):  
Fahad M. Almutairi ◽  
Haddad A. El Rabey ◽  
Adel I. Alalawy ◽  
Alzahraa A. M. Salama ◽  
Ahmed A. Tayel ◽  
...  
Keyword(s):  
Contact Time ◽  
Iron Nanoparticles ◽  
High Efficiency ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Brown Seaweed ◽  
Ion Concentration ◽  
Batch Adsorption ◽  
Mean Diameter ◽  
Adsorbent Dose

Biopolymers and nanomaterials are ideal candidates for environmental remediation and heavy metal removal. As hexavalent chromium (Cr6+) is a hazardous toxic pollutant of water, this study innovatively aimed to synthesize nanopolymer composites and load them with phycosynthesized Fe nanoparticles for the full Cr6+ removal from aqueous solutions. The extraction of chitosan (Cht) from prawn shells and alginate (Alg) from brown seaweed (Sargassum linifolium) was achieved with standard characteristics. The tow biopolymers were combined and cross-linked (via microemulsion protocol) to generate nanoparticles from their composites (Cht/Alg NPs), which had a mean diameter of 311.2 nm and were negatively charged (−23.2 mV). The phycosynthesis of iron nanoparticles (Fe-NPs) was additionally attained using S. linifolium extract (SE), and the Fe-NPs had semispherical shapes with a 21.4 nm mean diameter. The conjugation of Cht/Alg NPs with SE-phycosynthesized Fe-NPs resulted in homogenous distribution and stabilization of metal NPs within the polymer nanocomposites. Both nanocomposites exhibited high efficiency as adsorbents for Cr6+ at diverse conditions (e.g., pH, adsorbent dose, contact time and initial ion concentration) using batch adsorption evaluation; the most effectual conditions for adsorption were a pH value of 5.0, adsorbent dose of 4 g/L, contact time of 210 min and initial Cr6+ concentration of 75 ppm. These factors could result in full removal of Cr6+ from batch experiments. The composited nanopolymers (Cht/Alg NPs) incorporated with SE-phycosynthesized Fe-NPs are strongly recommended for complete removal of Cr6+ from aqueous environments.

scholarly journals Factory Tea Waste Biosorbent for Cu(II) and Zn(II) Removal from Wastewater

2021 ◽  
Vol 287 ◽  
pp. 04006
Author(s):  
Patrick Tan Peng Jun ◽  
Wan Nur Aisyah Wan Osman ◽  
Shafirah Samsuri ◽  
Juniza Md Saad ◽  
Muhamad Fadli Samsudin ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Removal Efficiency ◽  
Metal Ion ◽  
Metal Removal ◽  
Ph Value ◽  
Heavy Metal Removal ◽  
Fixed Bed ◽  
Ion Concentration ◽  
Fixed Bed Adsorption ◽  
Tea Waste

Recent studies have shown great interest toward heavy metal removal due to its hazardous and non-biodegradable properties. Many approaches have been used for this purpose and one of them is adsorption. In this study, several experiments were carried out to investigate the feasibility of factory tea waste as a biosorbent in a fixed-bed adsorption column for heavy metal removal (zinc and copper) in wastewater. The results highlighted that zinc has better performance compared to copper in terms of the effect of initial ion concentration, pH value, and the mixed ions with respect to the removal efficiency. Zinc showed higher removal efficiency and adsorption capacity at the initial metal ion concentration of 200 mg/L, which are 99.21% and 39.68 mg/mg compared to copper. Meanwhile, for the effect of pH values and mixed ion concentration, zinc also showed slightly higher removal efficiency which are 99.91% and 98.47%, respectively compared to copper. However, both zinc and copper showed a better fit to the Langmuir isotherm. The factory tea waste was characterized using Micromeritics ASAP 2020 instrument and results showed that the factory tea waste biosorbent consists of mesopores with the diameter and width of 4.85205 and 2.546985 nm, respectively.

Applications of chelating resin for heavy metal removal from wastewater

e-Polymers ◽  
2015 ◽  
Vol 15 (3) ◽  
pp. 161-167 ◽  
Author(s):  
Jun Jiang ◽  
Xiao-Shuang Ma ◽  
Ling-Yun Xu ◽  
Li-Hua Wang ◽  
Gao-Yan Liu ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ion ◽  
Metal Removal ◽  
Ph Effect ◽  
Heavy Metal Removal ◽  
Iminodiacetic Acid ◽  
Radical Copolymerization ◽  
Chelating Resin ◽  
Free Radical Copolymerization ◽  
Wastewater Disposal

AbstractThe chelating resin was synthesized by free-radical copolymerization of iminodiacetic acid modified glycidyl methacrylate with a cross-linker N,N′-methylene biscarylamide at 70°C for removal of heavy metal ions from aqueous solutions. The equilibrium adsorption capacities of the chelating resin from their single-metal ion solutions were 3.28 mmol/g for Cd(II), 2.36 mmol/g for Cu(II), 1.71 mmol/g for Mn(II), 1.69 mmol/g for Ni(II), 1.41 mmol/g for Zn(II), 1.24 mmol/g for Co(II), 0.78 mmol/g for Cr(III) and 0.66 mmol/g for Pb(II). Their related absorption behaviors are discussed in this paper such as thermodynamic equilibrium, pH effect and the Langmuir and Freundlich model to evaluate the experimental data. According to the results, this resin could be used as a promising adsorbent for industrial wastewater disposal.

scholarly journals Effect-Based Approach to Assess Nanostructured Cellulose Sponge Removal Efficacy of Zinc Ions from Seawater to Prevent Ecological Risks

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1283 ◽  
Author(s):  
Giulia Liberatori ◽  
Giacomo Grassi ◽  
Patrizia Guidi ◽  
Margherita Bernardeschi ◽  
Andrea Fiorati ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ion ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Negative Control Group ◽  
Negative Control ◽  
Control Group ◽  
Dna Integrity ◽  
Ecotoxicological Evaluation ◽  
Gill Cells

To encourage the applicability of nano-adsorbent materials for heavy metal ion removal from seawater and limit any potential side effects for marine organisms, an ecotoxicological evaluation based on a biological effect-based approach is presented. ZnCl2 (10 mg L−1) contaminated artificial seawater (ASW) was treated with newly developed eco-friendly cellulose-based nanosponges (CNS) (1.25 g L−1 for 2 h), and the cellular and tissue responses of marine mussel Mytilus galloprovincialis were measured before and after CNS treatment. A control group (ASW only) and a negative control group (CNS in ASW) were also tested. Methods: A significant recovery of Zn-induced damages in circulating immune and gill cells and mantle edges was observed in mussels exposed after CNS treatment. Genetic and chromosomal damages reversed to control levels in mussels’ gill cells (DNA integrity level, nuclear abnormalities and apoptotic cells) and hemocytes (micronuclei), in which a recovery of lysosomal membrane stability (LMS) was also observed. Damage to syphons, loss of cilia by mantle edge epithelial cells and an increase in mucous cells in ZnCl2-exposed mussels were absent in specimens after CNS treatment, in which the mantle histology resembled that of the controls. No effects were observed in mussels exposed to CNS alone. As further proof of CNS’ ability to remove Zn(II) from ASW, a significant reduction of >90% of Zn levels in ASW after CNS treatment was observed (from 6.006 to 0.510 mg L−1). Ecotoxicological evaluation confirmed the ability of CNS to remove Zn from ASW by showing a full recovery of Zn-induced toxicological responses to the levels of mussels exposed to ASW only (controls). An effect-based approach was thus proven to be useful in order to further support the environmentally safe (ecosafety) application of CNS for heavy metal removal from seawater.

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