Adsorptive removal of Methylene Blue, from aqueous solution using Tea Waste as a Low-Cost indigenous biosorbent: Mechanism of Adsorption, Equilibrium Study, Kinetics and Isotherms

For the current investigation, extracted Tea-Waste has been employed without activation for Methylene Blue removing in aqueous media. The experiment has been operated under batch conditions. The impact of a variety of significant factors affecting adsorption process, of which, adsorbent particle size, adsorbent/adsorbate shaking time, adsorbent dose, pH medium as well as the adsorbate initial concentration on Methylene Blue removing were investigated for optimization of the process according to the One Factor At a Time approach. The laboratory results revealing that this process is both spontaneously occurring and feasible. It has been demonstrated that maximal removing percentage (R) of 78.92% was obtained at a maximal experimental adsorption capacity (Qm,exp) of 7.892 mg.g-1. Methylene Blue adsorptive to Tea-Waste was according to the (S-class) isotherm. The Pseudo-Second-Order Kinetic Model agrees perfectly with results, with an adsorption capacity calculated (Qe,cal) of 7.194 mg.g-1. Also, we can affirm a best fitting adsorptive process through Langmuir's isothermal model, this confirms an adsorptive effect occurring in homogeneous area of Tea-Waste. Maximum calculated adsorption capacity (Qm,cal) defined by using Langmuir's has proven up to 14.085 mg.g-1. Consequently, the research suggests that Tea-Waste is a highly interesting option for efficiently treating real wastewater polluted by Methylene Blue

Investigation of Equilibrium and Kinetics in the Removal of Methylene Blue from Aqueous Solutions using Chamaerops humilis Fruit

Several sectors such as domestic, agricultural, and industrial use excessive amounts of water, resulting in the production of large quantities of water contaminated with organic and inorganic pollutants that are not or hardly biodegradable. The resulting effluents have adverse effects on human health and wildlife. To minimize these harmful effects, many wastewater treatment processes are currently being developed, including adsorption technology. In this work, the adsorption measurements in a batch setting were conducted utilizing an aqueous medium of an organic dye, Methylene blue on Chamaerops humilis fruits. The study examined several variables in the experiments, including the duration of contact, The starting level of the substance, the quantity of the material used for adsorption used, the speed of agitation, and the pH level of the dye solution. Moreover, the values at equilibrium were evaluated using the Freundlich and Langmuir adsorption isotherm models. The second-order kinetic is effectively utilized when examining adsorbent/adsorbate systems within the scope of this study

Inexpensive method for producing macroporous silicon particulates (MPSPs) with pyrolyzed polyacrylonitrile for lithium ion batteries

One of the most exciting areas in lithium ion batteries is engineering structured silicon anodes. These new materials promise to lead the next generation of batteries with significantly higher reversible charge capacity than current technologies. One drawback of these materials is that their production involves costly processing steps, limiting their application in commercial lithium ion batteries. In this report we present an inexpensive method for synthesizing macroporous silicon particulates (MPSPs). After being mixed with polyacrylonitrile (PAN) and pyrolyzed, MPSPs can alloy with lithium, resulting in capacities of 1000 mAhg−1 for over 600+ cycles. These sponge-like MPSPs with pyrolyzed PAN (PPAN) can accommodate the large volume expansion associated with silicon lithiation. This performance combined with low cost processing yields a competitive anode material that will have an immediate and direct application in lithium ion batteries

Detecting cadmium(II) by using coal extracted from argan oilcake waste (Argania spinosa) as modifier of carbon paste electrode.

The detection of Cd2+ ions was studied by cyclic voltammetry (CV) and Square Wave Voltammetry (SWV). This method is mainly based on the accumulation of Cd2+ ions on the surface of a carbon paste electrode modified by coal extract from argan oilcake waste (AC-CPE). To evaluate the detection  performance of AC-CPE against Cd2+ ions, an optimization  study was carried out to determine the following optimal conditions, pH=5, preconcentration time of 120s, and deposition potential of 1.2V. Under these optimal conditions, a linear relationship between current peak intensity and concentration has been defined  over a concentration range from 5.10-4 to 5.10-7M; with detection limit (DL, 3 б) of 3.04x10-6M. An analytical application of the electrode in a real matrix, tap water, was performed and revealed good detection performance of AC-CPE. These results show that the AC-CPE can be used as an excellent detector of Cd2+ ions in aqueous solutio

Evaluation of the inhibitor synergetic effect of aminotris (methylenephosphonic) acid and metallic salts on the corrosion of iron in acidic medium

International audienc

Experimental and theoretical explorations of S-alkylated mercaptobenzimidazole derivatives for use as corrosion inhibitors for carbon steel in HCl

Two mercaptobenzimidazole derivatives, namely the 1H-benzimidazol-2-thioyl hexane (MBI-C-6) and the 1H-benzimidazol-2-thioyl dodecane (MBI-C-12) were synthesized. The corrosion inhibiting potential of both compounds was studied in HCl solution (1.0 M HCl) for carbon steel. The investigation was conducted using gravimetric, electrochemical, Density Functional Theory (DFT), and molecular dynamics (MD) assessment methods. The carbon steel surfaces with or without the MBI-C-6 and MBI-C-12 were also assessed employing a Scanning Electron Microscope (SEM). The findings showed a high inhibition efficiency for both MBI-C-6 and MBI-C-12 at low concentrations, reaching 90% and 95.7% for MBI-C6 and MBI-C-12 at 10(-3) mol/L, respectively. Impedance results showed that the polarization resistance was greatly increased, from an initial value for the CS (in blank) of 12 up to 241 Omega cm(2) for the inhibited solution (1.0 mol/L HCl with 10(-3) mol/L of MBI-C-12). Tested compounds inhibited CS corrosion through a physical-chemical adsorption mechanism that followed Langmuir adsorption isotherm model with a change in the free energy of adsorption from -35.97 to -38.63 kJ/mol. DFT calculations and MD simulations were used to check the effect of the molecular structure of MBI-C-6 and MBI-C-12 on their reactivity and, on the other hand, to explain their adsorption mode on themetal surface. By scanning electron microscopy (SEM), the adequate protection of carbon steel by the usage of MBI-C-6 and MBI-C-12 in 1.0 M HCl was confirmed. All the outcomes from experimental findings and theoretical calculations were in line. (C) 2021 Elsevier B.V. All rights reserved.Deanship of Scientific Research at Umm Al-Qura University, Saudi Arabia [19-SCI-1-01-0033]; basic science research program through the National Research Foundation (NRF) of Korea - Ministry of Science, ICT and Future Planning [2015R1A5A1037548]The authors would like to thank the Deanship of Scientific Research at Umm Al-Qura University, Saudi Arabia, for supporting this work by Grant Code. 19-SCI-1-01-0033. This research was supported by basic science research program through the National Research Foundation (NRF) of Korea funded by the Ministry of Science, ICT and Future Planning (No. 2015R1A5A1037548)

Evaluation of the inhibitor synergetic effect of aminotris (methylenephosphonic) acid and metallic salts on the corrosion of iron in acidic medium

International audienc