Details

Autor(en) / Beteiligte

• Cruz, Daiane R.S.
• Santos, Bruna T.J.
• Cunha, Graziele C.
• Romão, Luciane P.C.

Titel

Green synthesis of a magnetic hybrid adsorbent (CoFe2O4/NOM): Removal of chromium from industrial effluent and evaluation of the catalytic potential of recovered chromium ions

Ist Teil von

• Journal of hazardous materials, 2017-07, Vol.334, p.76-85

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •NOM-rich water acts as a natural polymer for green synthesis.•The magnetic hybrid, CoFe2O4/NOM, was synthesized at ambient temperature.•The hybrid was used for removal of chromium ions from tanning industry effluent.•Removal tests showed excellent adsorptive potential and high capacity for reuse in five cycles.•The saturated adsorbent and recovered chromium ions were recycled as catalysts for use in the reduction of 4-nitrophenol. This work describes the removal of chromium ions from industrial effluent using a hybrid magnetic adsorbent, CoFe2O4/NOM, synthesized using water rich in natural organic matter. The hybrid obtained at ambient temperature (HbAmb) was calcined at 200, 400, and 800°C for 2h, and formation of the cobalt ferrite phase was confirmed by XRD, which indicated the presence of NOM in the structure of the material. Removal tests showed that HbAmb provided efficient removal of chromium at the natural pH of the effluent, while the other materials were effective at pH 6. Evaluation of the kinetics showed excellent performance of the process, with 70–87% removal in 20min, which provided a high degree of flexibility. The hybrid showed high removal during five reuse cycles, ranging from 96% in the first cycle to 82% in the final. The matrices containing the saturated adsorbent (HbAmb_Sat) and recovered chromium ions (CrD) showed high performance in the catalytic reduction of 4-nitrophenol, with conversion rates of 99.9% in short periods of time, as well as excellent potential for reuse in three cycles. The results demonstrated that the production of a technological material and its use for remediation could be achieved in an ecologically sustainable manner.