Production of Biodiesel from High Acid Value Waste Cooking Oil Using an Optimized Lipase Enzyme/Acid-Catalyzed Hybrid Process by N. Saifuddin, A. Z. Raziah, H. Nor Farah

“…By using a feedstock to methanol molar ratio of 1:15 and a sulphuric acid concentration of 2.5%, a biodiesel conversion of 88% was obtained at 50 °C for an hour reaction time. …”
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Durability Studies on Fly Ash Based Geopolymer Concrete Incorporated with Slag and Alkali Solutions by S. Nagajothi, S. Elavenil, S. Angalaeswari, L. Natrayan, Wubishet Degife Mammo

“…In this study, the durability of G30 grade geopolymer concrete has been investigated using tests acid resistance, water absorption, sulphate resistance, Rapid Chloride Penetration Test (RCPT), and rate of absorption (Sorptivity) test. The sulphuric acid, sodium sulphate, and water absorption tests were carried out at 28 days, 56 days, and 90 days for both the geopolymer and the conventional concrete. …”
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Evaluation of sorption properties of biochar produced by hydrothermal liquefaction of Phragmites australis by Natalia A. Muravieva, Yuliya V. Kulikova, Olga O. Babich

“…The maximum sorption capacity for methylene blue of 18.4 mg/g was achieved due to chemisorption for the sample after carbon activation with peroxide in the presence of sulphuric acid. The maximum BET surface area (18.47 m2/g) and total pore volume (0.186 cm3/g) were achieved for the sample after gas-vapor activation. …”
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Degradation of Anthraquinone Dye Reactive Blue 4 in Pyrite Ash Catalyzed Fenton Reaction by Milena Becelic-Tomin, Bozo Dalmacija, Ljiljana Rajic, Dragana Tomasevic, Djurdja Kerkez, Malcolm Watson, Miljana Prica

“…Pyrite ash (PA) is created by burning pyrite in the chemical production of sulphuric acid. The high concentration of iron oxide, mostly hematite, present in pyrite ash, gives the basis for its application as a source of catalytic iron in a modified Fenton process for anthraquinone dye reactive blue 4 (RB4) degradation. …”
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The Adsorption of Copper, Lead Metal Ions, and Methylene Blue Dye from Aqueous Solution by Pure and Treated Fennel Seeds by Ntandokazi Mabungela, Ntaote David Shooto, Fanyana Mtunzi, Eliazer Bobby Naidoo

“…Pure fennel seeds were labelled as PFS; nitric and sulphuric acid-treated seeds were designated as NAFS and SAFS, respectively. …”
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Texture and Microstructure of Thermally-Treated Acid-Leached Kaolinitic Clays by Mervat Hassan, Hassan El-Shall

“…Disordered, poorly crystalline kaolinite, containing some quartz and very little mica, was calcined at different temperatures and different times and then leached with 25 wt% sulphuric acid for 1 h at 98 °C. Calcination led to a reduction in both the specific surface area and the total pore volume due to dehydroxylation of kaolinite to meta-kaolinite (MK). …”
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Effect of strain energy on corrosion behavior of ultrafine grained copper prepared by severe plastic deformation by Rifai M., Mujamilah M., Bagherpour E., Miyamoto H.

“…The corrosion behavior by potentiodynamic polarization curve was observed in modified Livingstone solution, 1 M NaCl, and sulphuric solution. The structure of SSE processed sample showed that the first pass of the SSE processed sample displayed large deformation by developing the elongated grain and sub-grain structure. …”
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Extraction, Characterization and Epoxidation of Cotton Seed Oil by Abdullahi Muhammad, Fai Frederick, Chiroma Muhammad

“…The oil was epoxidized using 30% aqueous hydrogen peroxide as the oxygen donor and glacial acetic acid as the oxygen carrier in the presence of sulphuric acid as catalyst. The fresh oil and the products of the epoxidation reaction were characterized using FTIR analysis, the results of which indicated the disappearance of the carbon-carbon double bond peak at 1655 cm-1 and the appearance of the epoxide peak at 785 cm-1. …”
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The Reaction Extraction Combining Crystallization for Growth of Sodium Chloride in a Spray Fluidized Bed Crystallizer by Dan Zheng, Jie Yan, Jun Chen, Zeqin Wang

“…This work presents a novel approach for the growth of sodium chloride from supersaturated solutions by reaction-extractive crystallization in a spray fluidized bed crystallizer (SFBC), in which sodium sulfate solution is transformed into potassium chloride and sulphuric acid based on a reactive extraction-crystallization process using triisooctylamine (TOL) in n-octanol as the extraction system. …”
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