scholarly journals Bioconversion of Palm Oil into Biosurfactant by Halomonas meridiana BK-AB4 for the Application of Corrosion Inhibitor

2018 ◽  
Vol 18 (4) ◽  
pp. 718 ◽  
Author(s):  
Ira Prima Sari ◽  
Muhammad Imam Basyiruddin ◽  
Rukman Hertadi
Keyword(s):  
Surface Tension ◽  
Olive Oil ◽  
Corrosion Inhibitor ◽  
Palm Oil ◽  
Electrochemical Impedance ◽  
Halophilic Bacterium ◽  
Metal Corrosion ◽  
Acid Type ◽  
Moderately Halophilic Bacterium ◽  
Ring Method

Biosurfactant is environmentally friendly surfactant produced by a certain microorganism in a lipid-rich medium. A previous study has shown that Halomonas meridiana BK-AB4 had the potential of a moderately halophilic bacterium in converting olive oil into biosurfactant. In the present study, the effect of changing the carbon source from olive oil into cheaper and more abundant vegetable oil, which is palm oil, for the production of the biosurfactant was evaluated. The study began by optimizing the production medium with varying the nitrogen source, the concentration of palm oil and pH. The optimum condition of biosurfactant production was observed in the medium consisted of 0.6% (w/v) of urea, 2% (v/v) of palm oil and pH 9. The resulted biosurfactant was stable at pH 7–10 and in the salt concentration of 6–15%. Biosurfactant activity in lowering air-water surface tension was measured using the Du Noüy ring method, and the value of critical micelle concentration (CMC) was about 233 ppm. At this point, the surface tension of water dropped from 68.3 to 49.8 dyne/cm. Preliminary structural analysis by using FTIR technique suggested that the resulted biosurfactant has -OH, -C-H aliphatic C=C, H-C-C and C=O groups in its structure, which is similar to that of the fatty-acid type of biosurfactant. The potential of biosurfactant as a metal corrosion inhibitor was evaluated by using electrochemical impedance spectroscopy (EIS) that measured at 30 °C. The measurement revealed that the highest inhibition level was observed at the biosurfactant concentration about 200 ppm that corresponds to the inhibition level about 53.23%.

Preparation of polyaniline-modified praseodymium nanofibers as a novel eco-friendly corrosion inhibitor to protect AZ31 magnesium alloy

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Amir Samadi ◽  
Reza Amini ◽  
Mehran Rostami ◽  
Pooneh Kardar ◽  
Michele Fedel
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Inhibitor ◽  
Corrosion Inhibition ◽  
Potentiodynamic Polarization ◽  
Electrochemical Impedance ◽  
Conductive Polymers ◽  
Metal Corrosion ◽  
Az31 Magnesium Alloy ◽  
Content Type ◽  
Inhibition Performance

Purpose The purpose of this study was to evaluate the possibility of using conductive polymers such as polyaniline (PANI) as corrosion inhibitors for metals. Design/methodology/approach In this study, the effect of the addition of praseodymium (Pr3+) cations on the corrosion inhibition performance of PANI for AZ31 magnesium alloy was appraised through electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests. Findings The results of EIS and potentiodynamic polarization tests indicated the improvement of corrosion resistance of AZ31 during different immersion times. Research limitations/implications This anti-corrosion ability of PANI/Pr3+ composite applies as non-toxic environmentally friendly corrosion inhibitor on the self-healing corrosion protection properties. Practical implications The conductive polymers are interested for many industries. The reported data can be used by the formulators working in the R&D departments. Social implications The anti-corrosion ability of PANI/Pr3+ composite present a novel and high effective route against metal corrosion besides application of toxic corrosion. Originality/value The application of titanium dioxide coating in the field of architectural heritage is a great challenge. Therefore, the main objective of this study is to study the synthesis, characterization and corrosion inhibition performance of Pr3+ cations doped PANI nano-fibers as an anti-corrosion additive for AZ31 magnesium alloy in 3.5 Wt.% NaCl solution.

Perbandingan Karakteristik Surfaktan Metil Ester Sulfonat dan Sodium Lauril Sulfonat sebagai Bahan Emulsifier

2016 ◽  
Vol 9 (2) ◽  
pp. 167-176
Author(s):  
Eldha Sampepana ◽  
Paluphy Eka Yustini ◽  
Aditya Rinaldi ◽  
Amiroh Amiroh
Keyword(s):  
Fatty Acids ◽  
Surface Tension ◽  
Methyl Ester ◽  
Interfacial Tension ◽  
Palm Oil ◽  
Emulsion Stability ◽  
Raw Material ◽  
Enzymatic Method

Surfactant which is used as raw emulsifier in an industry activity such as Sodium Lauryl Sulfonate is a raw material import, it is petroleum derivative which is not renewable and may cause pollution to the environment, because it is not degraded and are carcinogenic. The purpose of the research is to compare the characteristics of the Quaternary methyl ester sulfonat (MES) and Sodium Lauryl Sulfonat (SLS) as emulsifier. First, make the MES by filtering and eliminating fatty acids of palm oil, then process the MES with enzymatic method become methyl ester, then react it in sulfonation and metanolization process, and also neutralized with NaOH. Next, the MES experiment is compared with SLS and existing MES in the market. The results show that surfactants MES experiment has value hidrofil lipofil balance (HLB) interfacial tension and emulsion stability greater than MES in the market and SLS. And the surface tension of MES experiment is larger than MES in the market, but smaller compared to SLS.ABSTRAKSurfaktan yang digunakan sebagai bahan baku emulsifer dalam aktivitas suatu industri pada saat ini seperti Sodium Lauril Sulfonat  merupakan bahan baku import yang merupakan turunan dari minyak bumi, dengan sifat tidak dapat diperbaharui dan dapat menimbulkan pencemaran terhadap lingkungan karena tidak mudah terdegradasi serta bersifat karsinogenik. Metil ester sulfonat dari bahan minyak sawit merupakan surfaktan dengan sifat mudah terdegradasi yang perlu diketahui karakteristiknya. Penelitian bertujuan untuk membandingkan karakteristik surfaktan metil ester sulfonat (MES) dan Sodium Lauril Sulfonat (SLS) sebagai bahan emulsifier. Mula-mula dilakukan pembuatan MES dengan cara menyaring dan menghilangkan asam lemak minyak sawit terlebih dahulu, kemudian diolah menjadi metil ester secara enzimatis, lalu direaksikan secara sulfonasi dan metanolisis, serta dinetralkan dengan NaOH. Selanjutnya MES hasil percobaan dibandingkan dengan SLS dan MES yang ada dipasaran. Hasil penelitian menunjukkan bahwa surfaktan MES memiliki nilai hidrofil lipofil balance (HLB) tegangan antar muka dan stabilitas emulsi lebih besar apabila dibandingkan dengan MES di pasaran dan SLS, kecuali nilai stabilitas emulsi antara MES dan SLS sama. Dan tegangan permukaan MES hasil percobaan, lebih besar dibandingkan dengan MES dipasaran, dan lebih kecil dibandingkan dengan SLS. Kata kunci :   Metil  ester sulfonat, hidrofil lipofil balance, emulsifier, sodium lauril sulfonat , stabilitas emulsi 

scholarly journals Experimental, DFT and MD Assessments of Bark Extract of Tamarix aphylla as Corrosion Inhibitor for Carbon Steel Used in Desalination Plants

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3679
Author(s):  
Ismat H. Ali
Keyword(s):  
Corrosion Inhibitor ◽  
Potentiodynamic Polarization ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Effect Of Temperature ◽  
Bark Extract ◽  
Plant Sample ◽  
Gravimetric Analysis ◽  
Sample Collection ◽  
Eis Measurements

This study aimed to examine the extract of barks of Tamarix aphylla as a corrosion inhibitor. The methodology briefly includes plant sample collection, extraction of the corrosion inhibitor, gravimetric analysis, plotting potentiodynamic polarization plots, electrochemical impedance spectroscopic measurements, optimization of conditions, and preparation of the inhibitor products. The results show that the values of inhibition efficiency (IE%) increased as the concentrations of the inhibitor increased, with a maximum achievable inhibition efficiency of 85.0%. Potentiodynamic polarization (PP) tests revealed that the extract acts as a dual-type inhibitor. The results obtained from electrochemical impedance spectroscopy (EIS) measurements indicate an increase in polarisation resistance, confirming the inhibitive capacity of the tested inhibitor. The adsorption of the inhibitor on the steel surface follows the Langmuir adsorption isotherm model and involves competitive physio-sorption and chemisorption mechanisms. The EIS technique was utilized to investigate the effect of temperature on corrosion inhibition within the 298–328 K temperature range. Results confirm that the inhibition efficiency (IE%) of the inhibitor decreased slightly as the temperature increased. Lastly, the thermodynamic parameters for the inhibitor were calculated.

scholarly journals Streptohalobacillus salinus gen. nov., sp. nov., a moderately halophilic, Gram-positive, facultative anaerobe isolated from subsurface saline soil

2011 ◽  
Vol 61 (5) ◽  
pp. 1127-1132 ◽  
Author(s):  
Xiaowei Wang ◽  
Yanfen Xue ◽  
Yanhe Ma
Keyword(s):  
Saline Soil ◽  
Qaidam Basin ◽  
Halophilic Bacterium ◽  
Diaminopimelic Acid ◽  
Rrna Gene ◽  
16S Rrna Gene Sequences ◽  
Moderately Halophilic ◽  
Moderately Halophilic Bacterium ◽  
The Family ◽  
Diamino Acid

A Gram-stain-positive, rod-shaped, non-sporulating, motile and moderately halophilic bacterium, designated strain H96B60T, was isolated from a saline soil sample of the Qaidam basin, China. The strain was facultatively anaerobic. Major end products formed from glucose fermentation were acetate, ethanol and lactic acid. The cell-wall peptidoglycan contained meso-diaminopimelic acid as the diagnostic diamino acid. The isoprenoid quinone component was menaquinone-6 (MK-6). The predominant cellular fatty acids were C16 : 0, anteiso-C13 : 0 and anteiso-C15 : 0. The genomic DNA G+C content of strain H96B60T was 36.2 mol%. Phylogenetic analysis based on comparative 16S rRNA gene sequences indicated that strain H96B60T represented a novel phyletic lineage within the family Bacillaceae and was related most closely to Halolactibacillus species (96.1–96.4 % similarity). Based on the phenotypic, chemotaxonomic and phylogenetic data presented, strain H96B60T is considered to represent a novel species of a new genus, for which the name Streptohalobacillus salinus gen. nov., sp. nov. is proposed. The type strain of Streptohalobacillus salinus is H96B60T ( = DSM 22440T  = CGMCC 1.7733T).

scholarly journals Oceanobacillus arenosus sp. nov., a moderately halophilic bacterium isolated from marine sand

2015 ◽  
Vol 65 (Pt_9) ◽  
pp. 2943-2948 ◽  
Author(s):  
Wonyong Kim ◽  
Chatuphon Siamphan ◽  
Jong-Hwa Kim ◽  
Ampaitip Sukhoom
Keyword(s):  
Halophilic Bacterium ◽  
Cellular Fatty Acid ◽  
Diaminopimelic Acid ◽  
Rrna Gene ◽  
Strictly Aerobic ◽  
Aerobic Bacterium ◽  
Marine Sand ◽  
Moderately Halophilic Bacterium ◽  
Distinct Lineage ◽  
Lipid Pattern

A Gram-stain-positive, spore-forming, rod-shaped, motile, strictly aerobic bacterium, designated CAU 1183T, was isolated from marine sand and its taxonomic position was investigated by using a polyphasic approach. The bacterium grew optimally at 30 °C, at pH 8.5 and in the presence of 2 % (w/v) NaCl. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain CAU 1183T formed a distinct lineage within the genus Oceanobacillus and exhibited the highest similarity to Oceanobacillus chungangensis CAU 1051T (97.6 %). The strain contained MK-7 as the predominant isoprenoid quinone and anteiso-C15 : 0 was the major cellular fatty acid. The cell-wall peptidoglycan contained meso-diaminopimelic acid. The polar lipid pattern of strain CAU 1183T consisted of diphosphatidylglycerol, phosphatidylglycerol and unidentified lipids, including two phospholipids, two glycolipids, a phosphoglycolipid and two lipids. The G+C content of the genomic DNA was 37.5 mol%. On the basis of phenotypic, chemotaxonomic and phylogenetic data, strain CAU 1183T should be assigned to a novel species in the genus Oceanobacillus, for which the name Oceanobacillus arenosus sp. nov. is proposed. The type strain is CAU 1183T ( = KCTC 33037T = CECT 8560T).

Gracilibacillus aidingensis sp. nov., a novel moderately halophilic bacterium isolated from Aiding salt lake

2017 ◽  
Vol 199 (9) ◽  
pp. 1277-1281 ◽  
Author(s):  
Tong-Wei Guan ◽  
Lei Tian ◽  
En-Yuan Li ◽  
Shu-Kun Tang ◽  
Xiao-Ping Zhang
Keyword(s):  
Salt Lake ◽  
Halophilic Bacterium ◽  
Moderately Halophilic ◽  
Moderately Halophilic Bacterium

The inhibitive properties of Nopal slime on the corrosion of steel in chloride-contaminated mortar

2015 ◽  
Vol 63 (1) ◽  
pp. 65-71 ◽  
Author(s):  
Wilfrido Martinez-Molina ◽  
Andres Torres-Acosta ◽  
Rosalba Hernández-Leos ◽  
Elia Alonso-Guzman ◽  
Itzel Mendoza-Pérez ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibitor ◽  
Electrochemical Impedance ◽  
Experimental Period ◽  
Experimental Program ◽  
Content Type ◽  
Industry Applications ◽  
Cactus Mucilage ◽  
Electrochemical Monitoring ◽  
Chloride Contaminated

Purpose – The purpose of this paper is to determine if a type of cactus mucilage, Opuntia ficus-indica (OFI), may act as a corrosion inhibitor for carbon steel in cement-based materials (mortar) exposed to chloride-laden environment. Design/methodology/approach – Mortar prisms, reinforced with carbon steel rods, were immersed in sodium chloride (NaCl) solution for five wet – dry cycles. The experimentation included electrochemical monitoring (corrosion potential, Ecorr, and polarization resistance, Rp) of carbon steel during the time of exposure until corrosion-induced cracking appeared at the mortar surface. Crack survey on the mortar prisms was performed. Carbon steel rods were retrieved from the mortar after crack survey and steel mass loss at the end of the experimental period was estimated. A comparison between the different mixtures was also performed. Findings – OFI mucilage did perform as a corrosion inhibitor of steel in chloride contaminated mortar. Research limitations/implications – The experimental program needs to be corroborated in concrete specimens with typical dimensions. The surface oxide/hydroxide formation of the carbon steel in contact with the OFI mucilage is still unknown; thus, electrochemical impedance spectroscopy (EIS) and X-ray diffraction (XRD) analyses are needed. Practical implications – OFI mucilage is a suitable natural product that can be used to increase durability of concrete structures not only in countries where OFI cactus is produced, but also in many other countries where this plant is considered a plague. Originality/value – The new information obtained from this paper is the innovative use of a by-product of this cactus plant for construction industry applications.

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