Enhanced and selective adsorption of Hg2+ to a trace level using trithiocyanuric acid-functionalized corn bract.
Environ Pollut
; 244: 938-946, 2019 Jan.
Article
in En
| MEDLINE
| ID: mdl-30469288
ABSTRACT
A novel trithiocyanuric acid-modified corn bract (TCA-CCB) was prepared, and its removal properties for Hg2+ were investigated. TCA-CCB showed a remarkable absorbability for Hg2+ in mixed ion solutions. Adsorption kinetics experiments indicated that the removal of Hg2+ on TCA-CCB was quick, with a removal rate of 99.07% within 5â¯min. In addition, the removal rate of Hg2+ exceeded 98% over all pH conditions. The adsorption process can be best described by pseudo-second-order kinetic and Hill isotherm models. The saturated adsorption capacity of TCA-CCB for Hg2+ was 390â¯mg/g. The TCA-CCB could efficiently adsorb Hg2+ from the simulated wastewater and reduce the Hg2+ concentration from 10â¯ppm to 12.35â¯ppb, which was lower than the greatest allowable value of 50â¯ppb and satisfied the emission standards required by the Chinese government. Moreover, the removal rate of Hg2+ was beyond 99% after three cycles. The results of the zeta potential and X-ray photoelectron spectroscopy (XPS) implied that the chelation and ion exchange between amino/thiol groups and Hg2+ played a significant role in the improvement of the adsorption properties. The corn bract modified by trithiocyanuric acid exhibits apparent advantages in the removal of Hg2+ from ppm to ppb due to its high selectivity, adsorption capacity and stability.
Key words
Full text:
1
Collection:
01-internacional
Health context:
2_ODS3
Database:
MEDLINE
Main subject:
Triazines
/
Water Pollutants, Chemical
/
Water Purification
/
Zea mays
/
Mercury
Language:
En
Journal:
Environ Pollut
Year:
2019
Document type:
Article