Quality Determination of Nickel-Loaded Silica Prepared from Poaceous Biomass

Abstract

Klason lignin or preacid hydrolysate of a poaceous biomass such as rice husk, rice straw ( Oryza sativa ), and wheat straw ( Triticum aestivum ) became a good source of highly pure silica by simple calcinations in the testing process for application of high-boiling solvent (HBS) pulping of agricultural byproduct. Especially, Klason lignin or preacid hydrolysis residue of rice husks offered highly purified silica, which was converted to an excellent Ni/SiO(2) catalyst for methanation of carbon dioxide. The Ni/SiO(2) catalyst showed superior properties after the following sequential treatments; preacid hydrolysis of rice husks, HBS pulping of the resultant residue, cellulase hydrolysis of the HBS pulp, calcinations of the resultant powder, impregnation of the silica sample with an aqueous solution of nickel nitrate, and final calcinations.

Characterization of High-Boiling-Solvent Lignin from Hot-Water-Extracted Bagasse

“…16,17 Meanwhile, HBS cooking technology was applied on biomass to produce highly pure silica. 18 It is crucial to exploit the full benefit from bagasse, especially for hemicellulose and lignin. Although the HBS delignification mechanism was reported extensively, the integrated hot-water extraction with HBS cooking has not been investigated and the properties of isolated lignin were scarcely characterized.…”

“…HBS (i.e., 1.4-butanediol) was of great interest because of its high boiling temperature (232 °C), good lignin solubility, and low pressure generated in the reactor during cooking. − A significant amount of lignin (60–80% on a lignin basis) can be removed using HBS cooking. During the cooking, the phenolic β–O–4 linkage of lignin was cleaved, whereas β–β and β–5 substructures were kept stable. , Meanwhile, HBS cooking technology was applied on biomass to produce highly pure silica …”

Effect of pH, Anions and Acids on the Extraction of Zinc (II) from Aqueous media using Acetylacetone Solutions of Sulphamethoxazole

“…Common sources of heavy metals include mining, industrial wastes, vehicle emissions, lead-acid batteries, paints, fertilizers, treated woods, aging water supply infrastructure etc. [6][7][8]. Solvent extraction is a way of separating solutes through two solvents (usually liquid) that can dissolve the substances of solutes, but both these solvents are immiscible.…”

Review on a novel biosilica source for production of advanced silica‐based materials: Wheat husk

“…The agro‐industrial wastes are generally either burnt or left to landfill areas that result in environmental problems such as air, soil, and water pollution . In an effort to protect the environment through the rising farming activities, researchers have explored the feasibility of evaluating agricultural wastes and by‐products in production of several materials such as composite materials, adsorbents, fillers, supplementary cementitious materials, and also silica‐based materials . Various agricultural wastes such bagasse husk, barley husk, and rice husk have been utilized as a low‐cost, surplus silica sources around the world.…”

“…4 In an effort to protect the environment through the rising farming activities, researchers have explored the feasibility of evaluating agricultural wastes and by-products in production of several materials such as composite materials, [5][6][7][8] adsorbents, [9][10][11] fillers, 12,13 supplementary cementitious materials, 14,15 and also silica-based materials. [16][17][18][19][20][21] Various agricultural wastes such bagasse husk, 22 barley husk, 23 and rice husk 24,25 have been utilized as a low-cost, surplus silica sources around the world. Among the wastes, wheat husk has been recently used as a novel silica source due to its noteworthy silica content that was obtained from earth during the growth process.…”