Waste Aluminum Cans Research Articles

Synthesis of zeolite nanostructures from waste aluminum cans for efficient removal of malachite green dye from aqueous media

Different zeolite nanostructures were synthesized from waste aluminum cans via a low-cost hydrothermal method using different silicon sources. The produced nanostructures were identified using XRD, FT-IR, SEM, and TEM analyses. XRD proved that the samples which synthesized using fumed silica and sodium metasilicate consist of a composite of (analcime, hydroxysodalite, and zeolite P1) and (sodium aluminum silicate hydroxide hydrate and nepheline hydrate), respectively. Moreover, the samples which synthesized using silica gel and tetraethyl orthosilicate composed of LTA zeolite and a composite of (sodium aluminum silicate hydroxide hydrate and zeolite 4A), respectively. The as-prepared zeolite nanostructures were tested in the removal of malachite green dye from aqueous media using a batch method. The results revealed that the adsorption processes fitted well with the pseudo-second-order kinetic model and Langmuir adsorption isotherm. In addition, the mechanism of adsorption processes was controlled by three successive stages, namely inner diffusion, outer diffusion, and pore diffusion processes where the pore diffusion is the rate-determining step. Additionally, thermodynamic parameters showed that the adsorption processes were spontaneous, physisorption, and exothermic.

Synthesis, Characterization and Efficiency of Alum Produced from Waste Aluminium Cans for Wastewater Treatment

Herein, the synthesis, characterization and efficiency test of alum obtained from waste aluminium cans were investigated for wastewater treatment. Prior to the synthesis of the alum, the cans were subjected to physical treatments such as communition(size reduction), plastic components removal, colour label removal, cleaning, pulverization etc. The physically treated waste aluminium cans were later chemically and step wisely converted to alum-a viable double salt. The process economy was found to be 99.37%. The synthesized alum and purchased alum were analyzed both qualitatively and quantitatively. The two samples exhibit similar coagulation performance.

Enhancement of hydrogen generation using waste aluminum cans hydrolysis in low alkaline de-ionized water

In this study, hydrogen generation using hydrolyzed waste aluminum can in low alkaline aqueous solution is evaluated and the result is efficient in comparison with Al powders. Waste Al can was pretreated using a series of methods, such as paint removal in concentrated sulfuric acid and fragmented Al pieces in planetary ball milling, and then characterized with BET, XRD and SEM techniques. During hydrogen generation, low alkaline solution combined with elevating temperature and Ni or Ni/Bi additives in waste Al can-water hydrolysis system could achieve rapid hydrogen generation rate to 150 ml s−1 g−1 and total volume 1350 ml g−1. Moreover, planetary ball-milling of waste Al scraps could increase effective reactive area to improve generated hydrogen. The optimized results, which are attributed from micro-galvanic cell formation between Al/Ni closely contact, and accelerating reaction activity, are comparable with Al powders. In this report we successfully optimize the generated hydrogen efficiency of waste Al can base without high alkaline concentration which could cause environmental pollution and instrument damage problems.

Synthesis of Alum from Discarded Aluminium Beverage Cans

This study provides a chemical process that recycles waste aluminium cans to alum crystals that has plenty applications in industry today. The study was performed with concentrated acidic and alkaline solution containing principal components K+ and SO42- ions. It involved the dissolution of aluminium can in KOH solution, neutralization by H2SO4 solution and cooling crystallization to produce alum crystals. Emphasis was placed on the percentage yield of alum and recovery of aluminium from waste aluminium can to useful product. The result obtained the highest yield of 80% when 1.5M of KOH solution and 9M of H2SO4 solution were used with 5 g of aluminium beverage cans. When the concentration of KOH and H2SO4 solution was increased, the yield of alum production was also increased. It was found that the crystallization process was effective in recovering aluminium in the form of alum from waste aluminium beverage cans.

Study on Waste Aluminum Cans Remelting and Purification Technology

With orthogonal optimization method, the impact of the ratio and addition of flux and melting temperature on the recovery and metal impurity quantity of waste aluminumcan is researched, and the optimal purification process is obtained:Formula 3 flux, melting temperature 740°Cand flux addition 4%. In this condition, the recovery rate is 89.3%, flux addition is 0.1024%. Furthermore, the ratio and addition of flux have a significant effect on the waste aluminum cans purification is concluded.

SEM–EDX and XRD characterization of zeolite NaA, synthesized from rice husk and aluminium scrap by different procedures for preparation of the initial hydrogel

A number of investigations have demonstrated that zeolite NaA could be synthesized using Si, extracted from rice husk ash; however, experiments on direct extraction of Si from rice husk (RH) are scarce. The main objective of the present study was to explore the possibility to synthesize high-quality zeolite NaA from RH and waste aluminium cans (as a source of Al), applying different procedures for the preparation of initial hydrogel and a unified procedure for crystallization of zeolite NaA. Products were characterized by SEM–EDX and XRD analyses. The investigation demonstrated that Si could be extracted directly from RH, avoiding the process of RH burning. Practically complete dissolution of Si from RH was achieved by alkali treatment (with 10 % NaOH for 7 h) at boiling temperature and atmospheric pressure, i.e. using refluxing system instead of autoclave for the preparation of Si-gel. Zeolite NaA samples synthesized from such Si-gels were pure, highly crystalline and white. Furthermore, it was found that the direct dissolution of Al in Si-gel did not affect the quality of the final product. Although this investigation was not focused on the mechanism of zeolite NaA crystallization, the results obtained indicated clearly that the history of Si-gel preparation played an important role in the nucleation and growth of zeolite NaA crystals and influenced their yield, size, and shape. Therefore, the optimization of Si-gel preparation procedure has to be considered as essential not only for the economy of the synthesis of NaA from RH, but also for the quality of the final product.

Mesoporous alumina prepared from waste aluminum cans and used as catalytic support for toluene oxidation

Mesoporous aluminas with high specific surface area were synthesized successfully via a template-free sol–gel method from aluminum isopropoxide (AIP) and aluminum hydroxide produced from waste aluminum cans. After calcinations at 500°C, the synthesized mesoporous aluminas were in gamma phase. The BET surface areas of the mesoporous aluminas obtained from synthesized AIP (427–556m2·g−1) were higher than that prepared from aluminum hydroxide (421m2·g−1). The synthesized alumina products have worm-like pores without long-range ordered framework. Liquid phase oxidation of toluene catalyzed by NiO supported on these mesoporous alumina has been carried out at room temperature.