Preparation and Applications of Salt-Resistant Superabsorbent Poly (Acrylic Acid-Acrylamide/Fly Ash) Composite

Abstract

Solution polymerization synthesized alt-resistant superabsorbent poly (acrylic acid-acrylamide/fly ash) composites. The mass ratio of acrylic acid (AA) to acrylamide (AM), the concentration of crosslinker, the neutralization degree (ND) of AA, and the polymerization temperature were investigated by single-factor method. Optimized conditions for the synthesis of poly (acrylic acid-acrylamide/fly ash) (PAA-AM/FA) are, as following: m (AA)/m (AM) is 1.5, the content of crosslinker N, N-methylenebisacrylamide. (MBA) is 0.7%, neutralization degree of AA is 70%, polymerization temperature is 70 °C, and fly ash (FA) content is 50%. The prepared PAA-AM/FA demonstrated superior water absorption performance. The absorption capacities of PAA-AM/FA for pure water and 0.9% NaCl solution were found to be 976 g·g−1 and 81 g·g−1, respectively. Furthermore, PAA-AM/FA was found to have excellent adsorption capacity (148 mg·g−1) for Rhodamine B in water. Fourier Transform-Infrared Spectroscopy (FT-IR), Thermogravimetric Analysis (TGA), and Scanning Electron Microscopy (SEM) characterized the prepared materials. Results showed that fly ash was incorporated into the macromolecular polymer matrix and played a key role in improving the performance of the polymer composites.

Preparation and anti‐evaporation properties of organic–inorganic superabsorbent based on Tragacanth gum and clay

“…As a result, water entered the SAP structure, and SAP did not maintain a fixed shape. At a content of 0.04%, the three‐dimensional SAP network reached a balance between rigidity and flexibility, 38 thus, the water absorption capacity was observed to be the largest.…”

Superabsorbent Polymer with Excellent Water/Salt Absorbency and Water Retention, and Fast Swelling Properties for Preventing Soil Water Evaporation

“…In curve b and curve c, the asymmetric stretching vibration peaks of -COO-at 1404 cm −1 and 1402 cm −1 can be observed, respectively; the stretching vibration absorption peak of sulfonic acid groups O=S at 627 cm −1 and 669 cm −1 , and the vibration absorption peaks at 1642 cm −1 and 1647 cm-1 were the stretching vibration peaks of C=O in the amide group [19,30], indicated that the polyacrylic acid chain and AMPS have been grafted onto the HEC skeleton. In the curve c, we found the Si-O-Si bending vibration peak of the laterite at 554 cm −1 [20], indicated that the laterite was involved in the polymerization reaction.…”

“…0.1 g sample under the optimum synthetic conditions was weighed and immersed in excess distilled water. Use a sieve to remove excess water at a set time interval (1,3,5,8,10,12,15,18,20,25,30,45,60,75,90,120,150,180, 210 and 240 min) and weighed it. The water absorption rate was calculated according to formula (1).…”

“…However, inorganic hydrogels have some disadvantages, such as structural instability and irreversibility, but the salt resistance is generally better. Therefore, the composite of polymers and inorganic materials can not only improve the gel strength, but also reduce its cost [19,20]. .…”

Preparation of Poly(acrylic acid-acrylamide/starch) Composite and Its Adsorption Properties for Mercury (II)

“…Mercury (II) ions in the environment mainly come from chlor alkali, battery manufacturing, chemical fertilizer, paper making, plastics, refining and paint industries [14,15]. The methods of mercury removal in water include chemical precipitation, coagulation, ion exchange, membrane filtration and adsorption [16,17]. Since most adsorption processes are exothermic and spontaneous.…”