Organo-nanobentonite and organo-nanokaoline for effective removal of Pb(II) ions from battery effluent: characterization, isotherm, kinetic studies

2019 ◽  
Vol 156 ◽  
pp. 303-315
Author(s):  
B. Uma Maheswari ◽  
V.M. Sivakumar ◽  
M. Thirumarimurugan
Keyword(s):  
Kinetic Studies ◽  
Effective Removal

scholarly journals Biosorption of lead contaminated wastewater using cattails (Typha angustifolia) leaves: Kinetic studies

2011 ◽  
Vol 76 (7) ◽  
pp. 1037-1047 ◽  
Author(s):  
Sharain Ling ◽  
Collin Joseph ◽  
How Eng
Keyword(s):  
Linear Regression Analysis ◽  
Model Fitting ◽  
Kinetic Studies ◽  
Second Order ◽  
Batch Adsorption ◽  
Typha Angustifolia ◽  
Order Model ◽  
Effective Removal ◽  
Pseudo Second Order ◽  
The Common

In this work, dried leaves of Typha angustifolia (TA), also known as the common cattail, were used as an adsorbent in kinetic studies of Pb(II) adsorption from synthetic aqueous solutions. Batch adsorption studies with dried TA leaves were conducted and they were able to adsorb Pb(II) from 100 mL of a 25 mg L-1 Pb(II) solution effectively with the optimized dosage of 0.6 g. Adsorption equilibrium was achieved within 8 hours with an effective removal percentage of 86.04 %. Adsorption kinetics was further evaluated using four kinetic models, i.e., the pseudofirst order, pseudo-second order, intraparticle diffusion and Elovich model. Fitting of the data was performed based on linear regression analysis. The sorption kinetic data fitted best to the pseudo-second order model with an R2 of 0.9979, followed closely by the Elovich model with an R2 of 0.9952. The obtained results showed the adsorption of Pb(II) by TA leaves, which is an abundant biological material, is feasible, cheap and environmentally friendly.

scholarly journals Nanostructured Cellulose-Based Sorbent Materials for Water Decontamination from Organic Dyes

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1570 ◽  
Author(s):  
Laura Riva ◽  
Nadia Pastori ◽  
Alice Panozzo ◽  
Manuela Antonelli ◽  
Carlo Punta
Keyword(s):  
Environmental Remediation ◽  
Organic Dyes ◽  
Cellulose Nanofibers ◽  
Kinetic Studies ◽  
Building Blocks ◽  
Effective Removal ◽  
Naphthol Blue Black ◽  
New Material ◽  
Branched Polyethylenimine ◽  
Sorbent Materials

Nanostructured materials have been recently proposed in the field of environmental remediation. The use of nanomaterials as building blocks for the design of nano-porous micro-dimensional systems is particularly promising since it can overcome the (eco-)toxicological risks associated with the use of nano-sized technologies. Following this approach, we report here the application of a nanostructured cellulose-based material as sorbent for effective removal of organic dyes from water. It consists of a micro- and nano-porous sponge-like system derived by thermal cross-linking among (2,2,6,6-Tetramethylpiperidin-1-yl)oxyl (TEMPO)-oxidized cellulose nanofibers (TOCNF), branched polyethylenimine 25 kDa (bPEI), and citric acid (CA). The sorbent efficiency was tested for four different organic dyes commonly used for fabric printing (Naphthol Blue Black, Orange II Sodium Salt, Brilliant Blue R, Cibacron Brilliant Yellow), by conducting both thermodynamic and kinetic studies. The material performance was compared with that of an activated carbon, commonly used for this application, in order to highlight the potentialities and limits of this biomass-based new material. The possibility of regeneration and reuse of the sorbent was also investigated.

scholarly journals Preparation and Characterization of a Novel Activated Carbon@Polyindole Composite for the Effective Removal of Ionic Dye from Water

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 3
Author(s):  
Bushra Begum ◽  
Saba Ijaz ◽  
Rozina Khattak ◽  
Raina Aman Qazi ◽  
Muhammad Sufaid Khan ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Oxidative Polymerization ◽  
Dye Adsorption ◽  
Kinetic Studies ◽  
Isotherm Model ◽  
Point Of Zero Charge ◽  
Potential Candidate ◽  
Operational Parameters ◽  
X Ray ◽  
Effective Removal

The present study is aimed at the synthesis and exploring the efficiency of a novel activated carbon incorporated polyindole (AC@PIN) composite for adsorptive removal of Malachite Green (MG) dye from aqueous solution. An AC@PIN hybrid material was prepared by in situ chemical oxidative polymerization. The physico-chemical characteristics of the AC@PIN composite were assessed using Fourier-transform infrared spectrometer, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, ultraviolet visible spectroscopy, and determination of point of zero charge (pHPZC). A series of adsorption studies was conducted to evaluate the influence of operational parameters such as pH, contact time, initial dye concentration, AC@PIN dosage, and temperature on dye adsorption behavior of developed composite. A maximum dye removal percentage (97.3%) was achieved at the pH = 10, AC@PIN dosage = 6.0 mg, initial dye concentration 150 mg L−1, and temperature = 20 °C. The kinetic studies demonstrated that the adsorption of MG on AC@PIN followed pseudo-second-order model (R2 ≥ 0.99). Meanwhile, Langmuir isotherm model was founded to be the best isotherm model to describe the adsorption process. Finally, the recyclability test revealed that the composite exhibits good recycle efficiency and is stable after 5 cycles. The obtained results suggest that AC@PIN composite could be a potential candidate for the removal of MG from wastewater.

scholarly journals Effective Removal of Acid Dye in Synthetic and Silk Dyeing Effluent: Isotherm and Kinetic Studies

ACS Omega ◽  
2021 ◽  
Author(s):  
Elizaveta Sterenzon ◽  
Vinod Kumar Vadivel ◽  
Yoram Gerchman ◽  
Thomas Luxbacher ◽  
Ramsundram Narayanan ◽  
...  
Keyword(s):  
Kinetic Studies ◽  
Acid Dye ◽  
Effective Removal ◽  
Dyeing Effluent ◽  
Silk Dyeing

scholarly journals Graphene Composites for Lead Ions Removal from Aqueous Solutions

2019 ◽  
Vol 9 (14) ◽  
pp. 2925 ◽  
Author(s):  
Mukesh Kumar ◽  
Jin Suk Chung ◽  
Seung Hyun Hur
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Adsorption Process ◽  
Industrial Effluents ◽  
Kinetic Studies ◽  
Process Conditions ◽  
Major Focus ◽  
Effective Removal ◽  
Synthetic Routes ◽  
Indiscriminate Disposal

The indiscriminate disposal of non-biodegradable, heavy metal ionic pollutants from various sources, such as refineries, pulp industries, lead batteries, dyes, and other industrial effluents, into the aquatic environment is highly dangerous to the human health as well as to the environment. Among other heavy metals, lead (Pb(II)) ions are some of the most toxic pollutants generated from both anthropogenic and natural sources in very large amounts. Adsorption is the simplest, efficient and economic water decontamination technology. Hence, nanoadsorbents are a major focus of current research for the effective and selective removal of Pb(II) metal ions from aqueous solution. Nanoadsorbents based on graphene and its derivatives play a major role in the effective removal of toxic Pb(II) metal ions. This paper summarizes the applicability of graphene and functionalized graphene-based composite materials as Pb(II) ions adsorbent from aqueous solutions. In addition, the synthetic routes, adsorption process, conditions, as well as kinetic studies have been reviewed.

Flavin radicals, conformational sampling and robust design principles in interprotein electron transfer: the trimethylamine dehydrogenase-electron-transferring flavoprotein complex

2004 ◽  
Vol 71 ◽  
pp. 1-14
Author(s):  
David Leys ◽  
Jaswir Basran ◽  
François Talfournier ◽  
Kamaldeep K. Chohan ◽  
Andrew W. Munro ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Kinetic Studies ◽  
Molecular Assembly ◽  
Conformational Sampling ◽  
Trimethylamine Dehydrogenase ◽  
Key Residues ◽  
Electron Transferring Flavoprotein ◽  
Electron Transfer Complex

TMADH (trimethylamine dehydrogenase) is a complex iron-sulphur flavoprotein that forms a soluble electron-transfer complex with ETF (electron-transferring flavoprotein). The mechanism of electron transfer between TMADH and ETF has been studied using stopped-flow kinetic and mutagenesis methods, and more recently by X-ray crystallography. Potentiometric methods have also been used to identify key residues involved in the stabilization of the flavin radical semiquinone species in ETF. These studies have demonstrated a key role for 'conformational sampling' in the electron-transfer complex, facilitated by two-site contact of ETF with TMADH. Exploration of three-dimensional space in the complex allows the FAD of ETF to find conformations compatible with enhanced electronic coupling with the 4Fe-4S centre of TMADH. This mechanism of electron transfer provides for a more robust and accessible design principle for interprotein electron transfer compared with simpler models that invoke the collision of redox partners followed by electron transfer. The structure of the TMADH-ETF complex confirms the role of key residues in electron transfer and molecular assembly, originally suggested from detailed kinetic studies in wild-type and mutant complexes, and from molecular modelling.

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