Functionalized PVA film with good adsorption capacity for anionic dye

Abstract

The dye-water treatment by polyvinyl alcohol (PVA) is still a challenge as PVA is characterized by its strong affinity to water. Therefore, this study aims to fabricate a functional PVA film with good regeneration ability to remove anionic dyes from aqueous solution using polyamidoamine dendrimers (PAMAM) as a modifier and epichlorohydrin as a cross-linker. Solution casting technique was applied to prepare the functionalized film. The adsorption efficiency of the film was evaluated by studying the effect of various parameters such as PAMAM loading (0, 12.5, 25, 50 wt%), initial dye concentration, film dose, solution pH, and adsorption time. The adsorption studies showed that with increasing PAMAM loading, the maximum adsorption capacity of the resulting film increased till it reached up to 73.8 mg/g by the PVA film with 50 wt% PAMAM. For understanding the nature of the adsorption process of the prepared film, the kinetics and isotherm analysis were studied. It was found that the mechanism of dye removal by the prepared film followed pseudo-secondorder kinetic and Freundlich isotherm, respectively. The adsorption and regeneration studies indicated that this film has great potential to effectively remove anionic dye from wastewater.

Rational design of in‐situ‐modified resorcinol formaldehyde aerogels for removing chlortetracycline antibiotics from aqueous solutions

“…Protonation of the adsorption sites occurs at low pH. As pH of the solution increases in acidic medium (2)(3)(4)(5)(6), number of ═N + H À groups decrease and number of the neutral ═N groups present on the surface of the particles increase, which ultimately increases CTC adsorption in the acidic medium. CTC adsorption by modified RF aerogel revealed that samples modified with PmPDA contained a large number of ═N groups that showed the sensitivity to CTC adsorption in pH range of 2-6.…”

“…[1] Water resources are prone to be polluted in various ways by different compounds like pharmaceuticals. [2][3][4] These chemicals are a threat and concern for clean drinking water sources and human/animal health. [5] In recent past years, drugs have been continuously discharged into aquatic environments.…”

Simultaneous removal of cationic crystal violet and anionic reactive yellow by using eco- friendly hybrid chitosan- talc-cloisite 30B composite

“…Nowadays, remediation of contaminated water from synthetic dyes is considered one of the most important challenges facing all countries due to the harmful effects of these dyes on the environment [1,2]. Synthetic dyes, industrial raw materials, are found in wastewater as a result of improper discharge of dyes from the textile, leather, paper, rubber, plastics, and pharmaceuticals industries [3,4]. The presence of these dyes in wastewater stream can lead to many environmental problems as they have carcinogenic and mutagenic properties on living organisms even at low concentrations [5,6].…”

“…Therefore, the removal of these dyes before they are discharged into various water bodies has become an essential step [7]. Several methods have been tested for removing toxic dyes from wastewater such as biological, ion exchange, advanced oxidation, coagulation, flocculation, ultra-filtration through membranes, and adsorption methods [3,6,8]. Adsorption method has received great attention among other methods due to its cost-effective, highly efficient, easy operation, simple design and availability of a wide range of adsorbent materials [1,3,7].…”

“…Several methods have been tested for removing toxic dyes from wastewater such as biological, ion exchange, advanced oxidation, coagulation, flocculation, ultra-filtration through membranes, and adsorption methods [3,6,8]. Adsorption method has received great attention among other methods due to its cost-effective, highly efficient, easy operation, simple design and availability of a wide range of adsorbent materials [1,3,7]. Recently, adsorption techniques using biopolymers have been developed to adsorb heavy metals and dyes from aqueous solutions.…”