Immobilization of Persimmon Tannin on Cellulose Viscopearls and Removal of Caffeine from Aqueous Solution
- PDF / 461,021 Bytes
- 13 Pages / 432 x 648 pts Page_size
- 77 Downloads / 216 Views
Immobilization of Persimmon Tannin on Cellulose Viscopearls and Removal of Caffeine from Aqueous Solution Dennise Alejandra Murguía Flores 1*, Ahmad La Ode 2, Ko-Ki Kunimoto 2, Jaime Bonilla Ríos1 1 Tecnológico de Monterrey, Campus Monterrey. Eugenio Garza Sada 2501 Sur Col. Tecnológico.C.P. 64849. Monterrey, Nuevo León, México. 2 Graduate School of Natural Science & Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan *Corresponding Author’s e-mail: [email protected] Tel: 018183582000 Ext.5000 ABSTRACT An eco-friendly adsorbent was prepared by immobilization of Persimmon Tannin (PT) in cellulose viscopearls to remove caffeine. The immobilization time within a range of 1-42days was performed. Batch adsorption experiments were studied for different Persimmon Tannin on Cellulose Viscopearls (PTIC) gel samples, adsorbent dosage, and initial caffeine concentration. FTIR indicated that PT was successfully immobilized onto viscopearls. SEM images showed differences especially on particle size and shape, between control, day7, and day28 of PTIC gel samples. The adsorption capacity results showed that removal of caffeine as the amount of adsorbed increased, the percentage of caffeine adsorption increased accordingly, but it decreased with the increased in initial caffeine concentration. Results for different PTIC gel samples showed that day 42 PTIC sample exhibits the highest adsorption capacity of caffeine solution of 43.3mg/g. The samples showed water contents in the range of 343-324%.The equilibrium data were analyzed using Freundlich and Langmuir equations. It suggested that viscopearls acted to be a suitable insoluble matrix to immobilized PT, instead of using crosslinkers. Keywords:
adsorption, polymer, organic
INTRODUCTION Adsorption techniques have been found to be effective due to low costs and simple handling. Various adsorbents as activated carbon substrates have been used because of their excellent adsorption properties. However, they are rather expensive [1]. Researchers have studied the feasibility of the alternative of low cost adsorbents with high adsorption [2]. Natural raw materials provide potential sources of low cost and eco-friendly adsorbents.[3,4] Tannins, natural biomass containing multiple adjacent hydroxyl groups, can be used as an alternative, effective, and efficient adsorbent. [5-7]. They are a group of polyphenolic compounds distributed widely in many plant species. They form complexes and precipitate with macromolecules such as proteins, polysaccharides, alkaloids, and heavy metals [8]. Also, they are traditionally used in tanning paper, fishing nets, and removing protein from sake [9]. Persimmon fruit (Diospyros kaki L.) are rich in soluble and non-soluble condensed tannins (proanthocyanidin) [10]. It is a fermented product (kaki-shibu) made from the juice of immature persimmons, and an important source of condensed tannins. Matsuo and Ito [11] first reported on
93
the compositon and structure of persimmon condensed tannins. The proposed primary consists of t
Data Loading...
