TY - JOUR
T1 - Removing nitrate with coconut activated carbon, tailored with quaternary ammonium epoxide compounds
T2 - Effect of base or acid carbon pretreatment
AU - Yuan, Chen
AU - Cannon, Fred S.
AU - Zhao, Zhiwei
N1 - Funding Information:
The authors gratefully acknowledge funding from Evoqua Company; the Fundamental Research Funds for the Central Universities (NO. cqu2018CDHB1A10); the National Natural Science Foundation of China (NO. 51878090); and thank the Chinese Scholarship Council for financial support that made this research possible. Cong Geng's help is appreciated. This work was conducted at the Pennsylvania State University, while Chen Yuan and coworkers were there.
Funding Information:
The authors gratefully acknowledge funding from Evoqua Company ; the Fundamental Research Funds for the Central Universities (NO. cqu2018CDHB1A10 ); the National Natural Science Foundation of China (NO. 51878090 ); and thank the Chinese Scholarship Council for financial support that made this research possible. Cong Geng's help is appreciated. This work was conducted at the Pennsylvania State University , while Chen Yuan and coworkers were there.
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2019/3/15
Y1 - 2019/3/15
N2 - The authors tailored coconut-based activated carbons with a quaternary ammonium epoxide (QAE) surfactant that greatly increased the carbon's capacity for sorbing nitrate from water. This QAE-tailored carbon processed deionized water spiked with 50 mg/L NO3 − through rapid small scale column tests; and achieved half-breakthrough at 477 bed volumes. This favorably compared to 52 bed volumes for the pristine coconut activated carbon. The QAE employed herein was QUAB 360. Most favorable pretreatment of the carbon was achieved via NaOH immersion, which created extensive phenolic functionality on the carbon's graphene edges, and raised the carbon's slurry pH to 9.3–9.6. These phenolics served as the anchor for the QUAB's epoxide reactions. This pretreatment offered the highest QUAB loading onto the carbon, which in turn netted the most nitrate removal. Per X-ray photoelectron spectroscopy, favorable QUAB360 preloading incurred a 1.62% increase in the quaternary N content of these activated carbons. The phenolic functionality that followed pretreatment was discerned by Boehm titrations; and these mathematically matched with Gaussian-based models that were fitted to incremental titration data. The most favorable QUAB-loaded variants were the ones whose pretreated precursors had exhibited the highest peak of functionality in the 9.3–10.4 pH range—corresponding to the pKa of phenolics. If the precursor pH was below the 9.3–9.6 range—as induced by acids or H2O2, then the QUAB's epoxide intermediate apparently over-reacted with the hydroxylated functionality of other QUAB molecules, rather than with phenolic functionality of the carbon's graphene edge sites.
AB - The authors tailored coconut-based activated carbons with a quaternary ammonium epoxide (QAE) surfactant that greatly increased the carbon's capacity for sorbing nitrate from water. This QAE-tailored carbon processed deionized water spiked with 50 mg/L NO3 − through rapid small scale column tests; and achieved half-breakthrough at 477 bed volumes. This favorably compared to 52 bed volumes for the pristine coconut activated carbon. The QAE employed herein was QUAB 360. Most favorable pretreatment of the carbon was achieved via NaOH immersion, which created extensive phenolic functionality on the carbon's graphene edges, and raised the carbon's slurry pH to 9.3–9.6. These phenolics served as the anchor for the QUAB's epoxide reactions. This pretreatment offered the highest QUAB loading onto the carbon, which in turn netted the most nitrate removal. Per X-ray photoelectron spectroscopy, favorable QUAB360 preloading incurred a 1.62% increase in the quaternary N content of these activated carbons. The phenolic functionality that followed pretreatment was discerned by Boehm titrations; and these mathematically matched with Gaussian-based models that were fitted to incremental titration data. The most favorable QUAB-loaded variants were the ones whose pretreated precursors had exhibited the highest peak of functionality in the 9.3–10.4 pH range—corresponding to the pKa of phenolics. If the precursor pH was below the 9.3–9.6 range—as induced by acids or H2O2, then the QUAB's epoxide intermediate apparently over-reacted with the hydroxylated functionality of other QUAB molecules, rather than with phenolic functionality of the carbon's graphene edge sites.
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U2 - 10.1016/j.jenvman.2018.12.096
DO - 10.1016/j.jenvman.2018.12.096
M3 - Article
C2 - 30599326
AN - SCOPUS:85059619012
VL - 234
SP - 21
EP - 27
JO - Journal of Environmental Management
JF - Journal of Environmental Management
SN - 0301-4797
ER -