Effect of geochemical properties on degradation of trichloroethylene by stabilized zerovalent iron nanoparticle with Na-acrylic copolymer

• Published in: Journal of environmental management 2014-11, Vol.144, p.88-92
• Main Authors: Chen, Meng-yi, Su, Yuh-fan, Shih, Yang-hsin
• Format: Article
• Language: English
• Subjects: Acrylic Resins - chemistry; Animal, plant and microbial ecology; Anion; Applied ecology; Biological and medical sciences; Cellulose; Conservation, protection and management of environment and wildlife; Copolymers; Environmental management; Fundamental and applied biological sciences. Psychology; General aspects; Groundwater; Groundwater - analysis; Iron - chemistry; Kinetics; Nanoparticles - chemistry; Nanoscale zero-valent iron (NZVI); Sodium - chemistry; Stabilized; Temperature; Trichloroethylene; Trichloroethylene - chemistry
• ISSN: 0301-4797; 1095-8630
• DOI: 10.1016/j.jenvman.2014.04.024

Stable nanoscale zero-valent iron (NZVI) particles have been developed to remediate chlorinated compounds. The degradation kinetics and efficiency of trichloroethylene (TCE) by a commercial stabilized NZVI with Na-acrylic copolymer (acNZVI) were investigated and compared with those by laboratory-synthesized NZVI and carboxymethyl cellulose (CMC)-stabilized NZVI particles. Results show that the degradation of TCE by acNZVI was faster than that by NZVI and CMC-NZVI. Increase in temperature enhanced the degradation rate and efficiency of TCE with acNZVI. The activation energy of TCE degradation by acNZVI was estimated to be 23 kJ/mol. The degradation rate constants of TCE decreased from 0.064 to 0.026 min−1 with decrease in initial pH from 9.03 to 4.23. Common groundwater anions including NO3−, Cl−, HCO3−, and SO42− inhibited slightly the degradation efficiencies of TCE by acNZVI. The Na-acrylic copolymer-stabilized NZVI, which exhibited high degradation kinetics and efficiency, could be a good remediation agent for chlorinated organic compounds. •Acrylic copolymer stabilized nano-zerovalent-iron (acNZVI) degraded TCE effectively.•acNZVI removed TCE faster than bare or carboxymethyl cellulose-stabilized NZVI did.•A small activated energy for the removal of TCE with acNZVI is 23 kJ mol−1.•Aqueous pH slightly affects the removal of TCE with acNZVI.•NO3−, Cl−, HCO3−, and SO42− only slightly inhibited the removal with acNZVI.