Capacity of ‘nopal’ pectin as a dual coagulant-flocculant agent for heavy metals removal
2017; Elsevier BV; Volume: 323; Linguagem: Inglês
10.1016/j.cej.2017.04.087
ISSN1873-3212
AutoresDiana Ibarra-Rodríguez, Jaime Lizardi‐Mendoza, Eduardo Alberto López-Maldonado, Mercedes Teresita Oropeza-Guzmán,
Tópico(s)Advanced Cellulose Research Studies
ResumoPectins are linear macromolecules with carboxylate and methoxylate groups. That may serve as coagulant-flocculant agents. At the same time it is expected that carboxylate groups act as a chelating agent and favor the entrapment of heavy metals. In this paper nopal pectin was tested to treat synthetic waste water (SWW) contaminated with metallic ions. First of all, it was extracted and characterized by FT-IR and NMR. Its molecular weight was approached by viscosimetry. Zeta potential measurements were done to determine the surface charge of the macromolecule and its ability to remove of metallic ions (Ca2+, Cu2+, Zn2+, Cr3+, Ni2+, Pb2+ and Cd2+). After its complete characterization, the ideal dose for the separation was obtained from experiments of consecutive additions of pectin in to a SWW. Finally, the solid and the supernatant were recovered and analyzed by MP-AES and SEM-EDS analyzes, it was determined that a dose of 0.019 mg/mL, removed to 99% of all metallic ions.
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