Study on the Extraction Method of Microplastic System in Textile Wastewater

Abstract

Microplastic pollution has become a global environmental problem. Textile microplastics are an important component of microplastic pollution, but little is known about their contamination in the industrial environment. The lack of standardized methods for detecting and quantifying textile microplastics is a major obstacle to determining the risks they pose to the natural environment. This study systematically examines the pretreatment options for the extraction of microplastics from printing and dyeing wastewater. The effectiveness of potassium hydroxide, nitric acid–hydrogen peroxide mixed solution, hydrogen peroxide, and Fenton’s reagent for the removal of organic matter from textile wastewater is compared. Three textile microplastics, polyethylene terephthalate, polyamide, and polyurethane, are studied. The effects of the digestion treatment on the physicochemical properties of textile microplastics are characterized. The separation efficiency of sodium chloride, zinc chloride, sodium bromide, sodium iodide, and sodium chloride-sodium iodide mixed solution on the textile microplastics is tested. The results showed that Fenton’s reagent achieved a 78% removal rate of organic matter from printing and dyeing wastewater. Meanwhile, it has less of an effect on the physicochemical properties of textile microplastics after digestion and is the best reagent for digestion. The zinc chloride solution achieved a 90% recovery for separating textile microplastics with good reproducibility. It does not affect the subsequent characterization analysis after separation and is the best solution for density separation.

Investigation on Microplastics in Soil near Landfills in the Republic of Korea

“…If these are not completely decomposed, identifying MPs is difficult, and further instrumental analysis results would be imprecise. Chemicals such as H 2 O 2 , FeSO 4 , NaOH, and HNO 4 are often used to remove organic matter, but using a chemical treatment that is too strong should be avoided to prevent MPs from melting or deteriorating [31,32]. Hence, 30% H 2 O 2 was used to remove organic matter completely from the soil.…”

Poly(Imide) Separator Functionalized by Melamine Phosphonic Acid for Regulating Structural and Thermal Stabilities of Lithium-ion Batteries

“…The use of thermally stable separators in lithiumion batteries (LIBs) has increased in recent years, given the continuing attempts to increase their energy density [1][2][3][4]. Many advanced electrode materials must offer a high specific capacity and working potential [5][6][7][8][9][10]; this further increases the need to ensure the safety of high-density LIBs as they may cause severe accidents with abnormal use [11][12][13][14][15].…”

Elemental Dissolution in Multicomponent PDC Based Mixed-Phase Hard Films

“…The Si-C-N has shown stability up to 1600C and it remains in the amorphous state up to 1500 o C. These properties make silicon carbonitride a promising material for prospective applications such as structural ceramics, MEMS, hard protective coatings, and electronic materials [23]. Si-C-N is being currently looked for the absorption of electromagnetic waves (shielding) [24][25][26][27], as thin film pressure and temperature sensors [28][29][30][31], as a bonding layer for memory devices [32] MEMS magnetic devices [33] and even in endodontics [34]. It has also been reported to show both metallic and piezoelectric properties and is a good alternative to SiC which only has insulating properties [35][36][37][38][39].…”