Chitosan-silica- polyethylene Glycol (Ch/Si/P) Solid Membrane for Removal of Cu(II), Zn(II) and Cd(II) Ions from Aqueous Solutions | Chapter 4 | Challenges and Advances in Chemical Science Vol. 1

 Chitosan is thought to be an interesting raw material for membrane production because it has functional groups of –NH2 and –OH that are easily modified. The chitosan membrane has flaws such as low mechanical properties. To compensate for these flaws, silica is added during the chitosan membrane synthesis process to improve chitosan membrane stability. Plasticizer is used in the membrane synthesis process to improve mechanical properties, maintain integrality, and avoid holes and cracks. The addition of a polyethylene glycol plasticizer is expected to significantly increase the physical and mechanical properties, as well as the hydrophilic properties, of the membrane surface, allowing metal ion remedy to easily diffuse through the chitosan-silica-PEG membrane. In this study, chitosan-silica-PEG (Ch/Si/P) membrane synthesis is performed using tetraethyl orthosilicate (TEOS) as a silica source, and the membrane is then used as an adsorbent for the ions Cu(II), Zn(II), and Cd(II) by batch method. According to research, batch adsorption to all membranes has an optimum pH for metal ions Cu(II) and Zn(II) = 6, Cd(II) = 5.5. The adsorption of the ions Cu(II), Zn(II), and Cd(II) in membranes follows the Langmuir isotherm model. In general, the ability of the Ch membrane to adsorb all adsorption metal ions increases with the addition of silica or PEG. In order, the adsorption capacity values for the ions Cu(II), Zn(II), and Cd(II) for the Ch/Si/P membrane are 262, 183, and 107 mol/g. In general, in adsorption kinetic data, the coefficient score of R2 linearity is higher in the second order of the pseudo kinetic model.

Author (S) Details

F. W. Mahatmanti
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Semarang, 50229, Indonesia.

E. Kusumastuti
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Semarang, 50229, Indonesia.

W. D. P. Rengga
Department of Chemical Engineering, Faculty of Engineering, Universitas Negeri Semarang, 50229, Indonesia.

Nuryono
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, 55281, Indonesia.

D. Siswanta
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, 55281, Indonesia.

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Application of Olea europaea Subsp. Cuspidata Wood Tar Oil as Anticorrosion for Mild Steel in Acidic Media | Chapter 10 | Current Perspectives on Chemical Sciences Vol. 5

 Corrosion, especially acidic corrosion caused by acidic solutions that are commonly used in acid washing, acid pickling and acid descaling, is one of the serious problems in industry. In the industrial sector, mild steel (MS) is commonly used and is prone to acidic solution corrosion. Corrosion processes in the manufacturing media are responsible for the degradation of metals. Different strategies exist to minimise metal surface corrosion or damage. Due to its low cost and ease of implementation and practise, the use of inhibitors is one of the most potent methods for corrosion protection. Inhibition of corrosion is preferred to stop metal dissolution and ingestion of acid, owing to its low cost and ease of use. In the current trend of corrosion inhibition research, the use of organic plants as corrosion inhibitors is at the forefront as the concern focuses on the protection of any industrial process in health and the environment. The need for novel corrosion inhibitor compounds has become more and more stringent in recent decades. Or from aromatic herb species or medicinal plants, natural organic inhibitors could be either synthesised or removed. In the present analysis, the bark performance of Olea europaea subsp. Electrochemical measurements [potentiodynamic polarisation (PDP) and electrochemical impedance spectroscopy (EIS)] were used to study Cuspidata as a corrosion inhibitor of mild steel in 1.0 M sulphuric acid. The findings have shown that Olea europaea subsp. Cuspidate wood tar oil serves as a potent inhibitor of corrosion and the inhibitor's output varied with mild steel concentrations of 1.0 M H2SO4 + 10% EtOH. The overall inhibition (percent) was 94.97 percent, with multiple methods used supporting the findings. According to electrochemical analysis, Olea europaea subsp. Cuspidata wood oil tar extract functions primarily as a cathodic inhibitor in mixed form. A scanning electron microscope (SEM) surface analysis was also performed to determine the corrosion inhibition properties of Olea europaea subsp. Cuspidata wood tar oil in solution of (1.0 M H2SO4 + 10 percent EtOH). The perks of Olea europaea subsp. Several are Cuspidata wood tar oil. The Langmuir isotherm was accompanied by adsorption of the wood tar extract on a mild steel surface.

Author(s) Details

Aisha M. Turkustani
Department of Chemistry Science, Faculty of Science, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia and Faculty of Science for Girl′s College, Jeddah University, Jeddah, Kingdom of Saudi Arabia.

Nehad M. Gumgumji
Faculty of Science for Girl′s College, Jeddah University, Jeddah, Kingdom of Saudi Arabia and Department of Biological Sciences, Faculty of Science, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia.

Abdulrahman S. Al Hajar

Department of Biological Sciences, Faculty of Science, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia.

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Critical Research on Enhancement of the Inhibitor Efficiency of 4-Phenyl-1,2-dithiol-3-thione on Corrosion of Mild Steel for 20% Sulphuric Acid | Chapter 7 | Current Research and Development in Chemistry Vol. 4

 Substituted 4-phenyl-1,2-dithiol-3-thione (PDTT), synthesised and tested as a mild steel corrosion inhibitor in the presence of oxygen by the technique of potentiodynamic polarisation and electrochemical impedance spectroscopy (EIS) in 20% H2SO4 at 25oC. Also at low concentrations, this organic compound prevents acidic corrosion. The results obtained indicate that this sulphur compound is and is in good agreement with good inhibitors. Polarization curves suggest that 4-phenyl-1,2-dithiol-3-thione is a cathodic inhibitor and has been studied to model the corrosion inhibition mechanism via an effective analogous circuit model in order to minimise the corrosion current obtained from electrochemical impedance spectroscopy measurement. 4-phenyl-1,2-dithiol-3-thione adsorption on the steel surface in a 20 percent H2SO4 solution complies with Langmuir's isotherm with a very high negative adsorption free energy value.

Author (s) Details

M. Dakmouche
Laboratoire de Valorisation et Promotion des Ressources Sahariennes, Université Kasdi Merbah de Ouargla, 30000 Ouargla, Algeria.

M. Saidi
Laboratoire de Valorisation et Promotion des Ressources Sahariennes, Université Kasdi Merbah de Ouargla, 30000 Ouargla, Algeria.

M. Hadjadj
Laboratoire de Valorisation et Promotion des Ressources Sahariennes, Université Kasdi Merbah de Ouargla, 30000 Ouargla, Algeria.

M. Yousfi
Laboratoire des Sciences Fondamentales, Université de Laghouat, 03000 Laghouat, Algeria.

Z. Rahmani
Laboratoire de Valorisation et Promotion des Ressources Sahariennes, Université Kasdi Merbah de Ouargla, 30000 Ouargla, Algeria.

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