فهرست مطالب

  • Volume:2 Issue:4, 2013
  • تاریخ انتشار: 1392/04/15
  • تعداد عناوین: 2
|
  • Asha Embrandiri, Rajeev Pratap Singh, Mahamad Hakimi Ibrahim Page 1
    Background
    Decanter cake is produced in large amounts, and its disposal is a major concern in palm-producing countries. Growth morphology and biochemical responses of lady''s finger (Abelmoschus esculentus) plants grown on soil amended with different ratios of decanter cake (0%, 10%, 20%, and 30%) were investigated.
    Results
    The soil pH decreased (unamended soil), whereas the electrical conductivity increased as compared with the control. There was a significant difference in ascorbic acid content with the increase in treatment ratio. Phenol content was however highest in 20% of the amendment (13.197 ± 0.36mg g-1).
    Conclusions
    The results indicate that decanter cake amendments of up to 10% may be a probable substitute for inorganic fertilizers with respect to lady''s finger (A. esculentus) plants due to high nutrient content, yield and biomass, as well as morphological characteristics. However, there were observable negative effects after 10% decanter cake amendment ratios.
    Keywords: Decanter cake, Amendment ratios, Phenol content, Specific leaf area, Chlorophyll, Lady's finger
  • Zainal A. Masud, Mohammad Khotib, Muhamad Farid, Anwar Nur, Muhamad Amroni Page 7
    Background
    Cassava waste pulp from the tapioca industry is abundant in Indonesia. However, there have been few Indonesian or international papers describing research on the possible use of cassava waste pulp as a superabsorbent after modification. The goal of this work was to increase the added value of cassava waste pulp by converting it into a superabsorbent. This conversion was carried out by a graft copolymerization of cassava waste pulp using acrylamide, ammonium persulfate, and N,N′-methylene-bisacrylamide as a monomer, an initiator, and a crosslinker, respectively. The copolymerization was conducted at 70°C for 3 h and saponified with 1 M NaOH for 2 h.
    Results
    The superabsorbent had a maximum water absorption capacity of 1,014 g/g at pH 7.3; the absorbency was affected by the salinity of the medium. The rate parameter for absorption in distilled water was 5.4 min. The formation of a superabsorbent was confirmed by FTIR spectroscopy, as the spectra exhibited all characteristic bands of both cassava waste pulp and acrylamide.
    Conclusion
    Cassava waste pulp has a great potential to be used as a superabsorbent, which could give added value to cassava.
    Keywords: Cassava waste pulp, Acrylamide, Copolymerization, Superabsorbent, Water absorption capacity