Sustainable hybrid silica extracted from rice husk with polyvinyl alcohol and nicotinic acid as multi adsorbent for textile wastewater treatment

Abstract

A new eco-friendly compound was prepared for the treatment of textile wastewater containing mixed dyes with various ranges of toxicity. Porous silica was extracted from a black liquor by-product using a simple method and characterized by porous morphology (the pore size ranged between 12 and 41 nm). The silica is the main corrosive agent present in the black liquor; thus, the extraction of silica from the black liquor was considered detoxification process. The extracted porous silica was used as a precursor material to prepare the hybrid material based on polyvinyl alcohol (PVA) as a binder polymer and functionalized by nicotinic acid. The multifunction prepared hybrid was characterized by FT-IR, TGA, DTGA, SEM, and EDX. The porous size of the prepared hybrid varied from 96 nm to 620 nm and presents a high thermal stability in comparison with its parent materials. The adsorption of cationic and anionic dyes was carried out. The adsorption kinetics parameters were fitted with pseudo-firstorder and pseudo-second-order kinetic models for methyl orange (MO) and methylene blue (MB), respectively. The adsorption parameters indicated that the Langmuir model is better to describe the adsorption of dyes on the hybrid material. The maximum adsorption capacity was 484 and 771 mg/g for MO and MB, respectively.

Investigating degradation metabolites and underlying pathway of azo dye “Reactive Black 5” in bioaugmented floating treatment wetlands

“…6). As observed, three major reactions, namely, the conversion of double into single bonds, break of azo bonds, and detachment of sulfonic groups, along with the addition of H-atoms are involved in the degradation of RB5, which indicates that RB5 degradation proceeds through a reductive pathway (Ribeiro et al 2017;Hasanin 2020). Particularly, the detachment of sulfonic mediety from the parent compound formed product 3 (when one -SO 3 Na group is cleaved) and product 5 (when both -SO 3 Na groups are eliminated).…”

“…Therefore, the comprehensive description of the biodegradation products and intermediates of synthetic dyes has a signi cant role in the assessment of the ecological fate of these contaminants (Ribeiro et al 2017;Hasanin 2020).…”

pH-Responsive Inorganic/Organic Nanohybrids System for Controlled Nicotinic Acid Drug Release

“…The characteristic bands of intact NA are broad bands at 3450 [ 73 ] and sharp ones at 3073 and 2830 cm −1 due to the O-H and C-H stretch modes. FT-IR shows two major peaks associated with carboxylic acid at 1710 and 1320 cm −1 due to asymmetric and symmetric bonds (▲, black up-pointing triangle) [ 74 , 75 , 76 ]. As the NaOH is titrated up, NA could be deprotonated and intercalated in the LDH interlayer, so the peaks related to -COOH would be changed.…”

Nanomaterials and nanofibers as wound dressing mats: An overview of the fundamentals, properties and applications

“…Cellulose is among the most common polysaccharides in nature and is the major structural component of plant cell walls [44][45][46][47]. Cellulose is a broadly applied sustainable and renewable basic compound in order to produce biopolymer-derived industries, and the utilization of this derived biopolymer is very affordable due to its broad accessibility.…”

“…PVA (polyvinyl alcohol) is a widely used synthetic polymer that is water soluble and can be produced in large quantities economically [45]. Due to its high chemical resistance, physical characteristics, and biodegradability, PVA is one of the most often utilized polymers for ultrafine electrospun fiber manufacturing.…”