Synthesis of Ni-Al LDH by co-precipitation method and its application in removal of dyes

The pollution of rivers and lakes by textile dyes has resulted in a series of environmental problems with serious consequences for fauna and flora. Approximately 100,000 kinds of dyes are available worldwide with annual production exceeding 1,000,000 tons. During dye production and the dyeing process, about 15% of all dyes are disposed of in wastewaters, primarily due to incomplete fixation of the dye onto the fabric. Adsorption processes have been extensively studied for the removal of dyes from textile wastewaters [1]. Recently, Layered double hydroxides (LDH), also known as hydrotalcites, have been widely used as adsorbent for various applications due to their unique anion exchange capability [2]. LDH can be described by the general formula [MII1 − xMIIIx(OH)2]An−x/n·mH2O, abbreviated as, [MII-MIII-A], where MII and MIII are divalent and trivalent metal cations An− is the intercalated anion with n−electrical charge, and m denotes the number of interlayer water molecules [1]. The LDH structure scheme is displayed in the following figure [3].In this project, Ni-Al LDH was synthesized and the adsorption performance was evaluated by the removal of dye. Ni-Al LDH was successfully prepared by co-precipitation method. For characterization, various techniques including XRD, FTIR and SEM were used. The XRD pattern shows the characteristics peaks of the LDH as literature, FTIR with the corresponding peaks of O−H of H2O and C−O of carbonate and SEM with the morphology and size of particles.

کلیدواژه ها:

Nickel ، Aluminium ، LDH ، Dye removal