Radiation‐Synthesized Acrylamide/Crotonic Acid Hydrogels for Selective Mercury (II) Ion Adsorption

Abstract

Öz Bu çalışmada akrilamid-krotonik asit hidrojelleri metilen mavisi boyasının gideriminde adsorban olarak kullanılmıştır. Boyanın adsorpsiyonuna pH'nın, krotonik asit yüzdesinin, başlangıç boya derişiminin ve tekrar kullanım sayısının etkisi araştırılmıştır. Yalnızca akrilamidle hazırlanan hidrojellerde pH'nın artması ile adsorpsiyonda bir miktar artış görülmüştür. Akrilamid-krotonik asit hidrojellerinde pH 7, 9 ve 10'da adsorpsiyon hemen hemen yakın bulunmuş, buna karşılık pH 8'de belirgin bir azalma gözlenmiştir. Hidrojellerde bulunan krotonik asit yüzdesinin artması ile adsorpsiyon belirgin bir şekilde artmıştır. Ayrıca adsorbsiyon-desorpsiyon çalışmaları sonucu göstermektedir ki, 20 kere tekrar kullanımdan sonra bile hidrojellerin adsorpsiyon kapasitesi hemen hemen hiç azalmamıştır. Sonuçlar akrilamid-krotonik asit hidrojellerin endüstriyel ölçekte tekstil atık sularından boyaların gideriminde adsorban olarak kullanılabileceğini göstermektedir. Anahtar Kelimeler "akrilamid, krotonik asit, hidrojel, metilen mavisi, adsorpsiyon, tekstil" Abstract In this study acrylamide-crotonic acid hydrogels are used as adsorbent for removal of methylene blue. The effects of pH, crotonic acid percentage, initial dye concentration and reusage number on the adsorption of the dye are investigated. When the pH increased adsorption also slightly increased with the hydrogels made up of only acrylamide. With the acrylamide crotonic acid hydrogels adsorption rates are similar in pH 7,9 and 10 but there is a significant decrease in pH 8. Adsorption increases with the increasing crotonic acid percentage in hydrogels. In addition, the adsorption-desorption results showed that the adsorption capacity of the hydrogel was not changed even after 20 times repeated use. Results show that acrylamide-crotonic acid hydrogels can be used as adsorbent for dye removal in industrial textile waste water.

Amperometric Detection of Mercury Ions Using Piperazine‐Functionalized Reduced Graphene Oxide as an Efficient Sensing Platform

“…This results in an increase in the amount of Hg (II) and significantly improves the current signal (see Scheme 3). [17,68] Characterization of the surface morphology of the Hg 2 + / P-rGO/SPCE.…”

Selective Removal of Mercury(II) Using Hydrogels Prepared by Gamma Radiation

“…This equation is valid for the first 60 % of F. It shows Fickian diffusion if n = 0.5, non-Fickian diffusion if 0.5 > n > 1, and Case II transport behavior if n = 1. 16,27 For HM and HM/ACR hydrogels, the F-t plots are drawn (Fig. 3), and n and k D parameters are calculated using the nonlinear regression.…”

“…[10][11][12] However, hydrogels, polymeric network structures, have been used to remove Hg 2+ in a limited number. [13][14][15][16] Hydrogels are crosslinked, three-dimensional hydrophilic polymer networks which show kaleidoscopic swelling because of inherent crosslinks. Water-loving functional groups, i.e., hydroxyl, carboxylic, amidic, sulfonyl, etc., which may be present in the hydrogel, absorb water, thereby enhancing the hydrogel ability to retain water.…”

Mercury Removal from Wastewater Using Cysteamine Functionalized Membranes

“… 1 − 3 Depending on site-specific conditions such as mercury speciation, geochemical conditions, and the presence of labile organic matter, certain mercury species deposited in sediments can be methylated over time and potentially accumulate in benthic organisms and fish to levels of concern. 4 Development of processes for effective, sustained, and cost-effective removal of dissolved Hg, elemental Hg, and nanoparticulate HgS from various wastewaters has been a challenge to scientists and the engineering community. 5 − 8 A variety of physical and/or chemical treatment processes have been proposed and developed for removal of particle-bound and dissolved Hg species from wastewater.…”

“…Discharge of wastewaters with elevated concentrations of mercury and other heavy metals can potentially impact aquatic life and the food chain. − Depending on site-specific conditions such as mercury speciation, geochemical conditions, and the presence of labile organic matter, certain mercury species deposited in sediments can be methylated over time and potentially accumulate in benthic organisms and fish to levels of concern . Development of processes for effective, sustained, and cost-effective removal of dissolved Hg, elemental Hg, and nanoparticulate HgS from various wastewaters has been a challenge to scientists and the engineering community. − A variety of physical and/or chemical treatment processes have been proposed and developed for removal of particle-bound and dissolved Hg species from wastewater. − The effectiveness of physical separation of particle-bound Hg through methods such as filtration, flotation, centrifugation, or gravity settling is typically a function of particle size and/or specific gravity.…”