Production of high-purity quartz for optical applications DOI
Francesco Ferella, Svetlana Zueva, Ionela Birloaga

и другие.

Опубликована: Янв. 1, 2024

The paper investigated the production of high-grade quartz for optical devices, starting with mined quartz. This material contained 668 mg/kg Fe2O3, and aim was to reduce content below 100 through an environmentally economically sustainable process. It found that sequential leaching water-oxalic-sulphuric acid is very efficient using two stages; both acids can be used times. best conditions were: water S/L 100%, temperature 90°C, time 45 min; oxalic stage: OA concentration 17 g/L, 2.5 h, 20% wt/vol; sulphuric SA 2 mol/L, 1.5 wt/vol. recovered from spent solution recycled. recycling tested NF membrane module: rejection iron sulfate silica (silicic acid) greater than 85%. permeate then a further stage. removes most significant elements, which avoids final product less ppm Whiteness Index (D65/10°) 88, minimum threshold required applications.

Язык: Английский

BIODEGRADATION OF EXPANDED POLYSTYRENE USING PSEUDOMONAS AERUGINOSA VITARK5 DOI Open Access

Arun Dhanasekaran,

Khyati R. Tiwari,

Arpita Bhange

и другие.

Detritus, Год журнала: 2025, Номер 30, С. 99 - 108

Опубликована: Март 31, 2025

Polystyrene, a widely used thermoplastic, polluting the environment in form of micro/nanoplastics. Though traditional methods are commonly employed for plastic management, microbial degradation remains more promising and eco-friendly approach. The present study focused on biodegradation expanded polystyrene (EPS) using microbes isolated from plastic-contaminated sites assessing degradants their industrial importance. An isolate, VITARK5, was able to grow well Bushnell Haas agar containing EPS as only carbon source chosen studies. With robust glycolipid biosurfactant synthesis biofilm formation, VITARK5 identified be Pseudomonas aeruginosa. In order biodegradation, inoculated broth thin film incubated at 37°C 120 rpm two weeks. After gravimetric analysis showed 14.53% weight reduction compared control. Formation cracks rough surfaces observed under scanning electron microscopy. GCMS presence industrially important chemicals such valerenol, 3-hydroxyl, 4-methoxy benzaldehyde, oxalic acid, dodecane, azacyclododecane hexadecane. FTIR spectroscopy confirmed functional groups associated with its additives. Biofilm formation production synergistically would have promoted biodegradation. findings suggest that isolate P. aeruginosa sp.VITARK5 may bioremediation valorisation achieve circular bio-economy.

Язык: Английский

Процитировано

0
Optimizing High Purity Aluminum Extraction from Bauxite: A Comprehensive Hydrometallurgical Approach DOI
Bárbara da Rocha Pereira, Morgana Rosset, Denise Crocce Romano Espinosa

и другие.

JOM, Год журнала: 2025, Номер unknown

Опубликована: Апрель 9, 2025

Язык: Английский

Процитировано

0
Production of high-purity quartz for optical applications DOI
Francesco Ferella, Svetlana Zueva, Ionela Birloaga

и другие.

Опубликована: Янв. 1, 2024

The paper investigated the production of high-grade quartz for optical devices, starting with mined quartz. This material contained 668 mg/kg Fe2O3, and aim was to reduce content below 100 through an environmentally economically sustainable process. It found that sequential leaching water-oxalic-sulphuric acid is very efficient using two stages; both acids can be used times. best conditions were: water S/L 100%, temperature 90°C, time 45 min; oxalic stage: OA concentration 17 g/L, 2.5 h, 20% wt/vol; sulphuric SA 2 mol/L, 1.5 wt/vol. recovered from spent solution recycled. recycling tested NF membrane module: rejection iron sulfate silica (silicic acid) greater than 85%. permeate then a further stage. removes most significant elements, which avoids final product less ppm Whiteness Index (D65/10°) 88, minimum threshold required applications.

Язык: Английский

Процитировано

0