Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 401, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.123352
Keywords
Binding energy; Metal adsorption; Polyelectrolyte complex; Selective separation; Self-coagulation
Categories
Funding
- Korean Government through NRF [2020R1A2C3009769]
- Ministry of Education through the Global Ph.D. Fellowship Program [2019H1A2A1073523]
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Target-tunable adsorbents were successfully developed through facile polyelectrolyte complexation for metal treatment in water, exhibiting good adsorption properties and tunability to efficiently remove heavy metals or recover precious metals.
Metal-containing wastes in aquatic environments lead to public health hazards and valuable resource lose. Metal-bearing wastewater must be treated to remove heavy metals or recover precious metals. To achieve these, target-tunable adsorbents that bind cationic and anionic metal species were developed through facile polyelectrolyte complexation using polyethylenimine (PEI) and polyacrylic acid (PAA). Utilizing the properties of the two polyelectrolytes and pK alpha variabilities, stable tunable adsorbents were fabricated in water without additional solvents. The homogenous complex adsorbents were strategically synthesized via dissolution in 0.1 M NaOH and drop-wise addition of 1 M HC1, followed by crosslinking with glutaraldehyde. Consequently, the adsorbents in alternating weight ratios of 4:1 and 1:4 (PEI:PAA) exhibited good tunability and adsorption properties. The maximum single metal adsorption capacities were 1609.7 +/- 49.6 and 558.6 +/- 9.67 mg/g for gold and cadmium, respectively. The pseudo-second-order model fitted the kinetics data more appropriately and was recognized as the rate controlling step. In a binary mixture, gold selectivity was observed to be influenced by adsorption-reduction mechanism, which was elucidated by XRD and XPS. Moreover, the adsorbents demonstrated NO3- sequestration properties, a feat deemed important for environmental remediation of nitrate ions. Finally, sequential separation was achieved with ethylenediaminetetraacetic acid (EDTA) and acidified thiourea.
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