Showing papers by "Joseph R.V. Flora published in 2013"
TL;DR: Results from batch experiments indicate that the majority of cellulose conversion occurs between the first 0.5-4h, and faster conversion occurs at higher temperatures, and data collected over time suggest cellulose solubilization occurs prior to conversion.
204 citations
TL;DR: Hydrothermal carbonization is a thermal conversion technique that converts food wastes and associated packaging materials to a valuable, energy-rich resource, and results in net positive energy balances at all conditions, except at a 5% solids concentration.
139 citations
TL;DR: In this paper, combined coagulation-adsorption treatment using single-walled carbon nanotubes (SWCNTs), multiwalled Carbon Nanotubes, and powdered activated carbon (PAC) was employed for the removal of endocrine disrupting chemicals (EDCs) from various water sources.
83 citations
TL;DR: In this article, a comparison of flux and removal behaviors of the relative hydrophilicities of several synthetic organic compounds (SOCs) was performed with both forward osmosis (FO) and reverse osmotic (RO) experiments with both FO and RO membranes.
77 citations
TL;DR: NPX removal was greater than AAP removal under all US-induced reaction and SWNT adsorption conditions, which is governed by the chemical properties of PhACs.
72 citations
TL;DR: Interaction energies calculated using dispersion corrected density functional theory show that atrazine is more strongly adsorbed to surfaces without weakly associated alkyl groups.
58 citations
TL;DR: It is suggested that SWNT stability can be chirality dependent in typical aquatic environment through ab initio molecular modeling.
Abstract: Aggregation kinetics of chiral-specific semiconducting single-walled carbon nanotubes (SWNTs) was systematically studied through time-resolved dynamic light scattering. Varied monovalent (NaCl) and divalent (CaCl2) electrolyte composition was used as background solution chemistry. Suwannee River humic acid (SRHA) was used to study the effects of natural organic matter on chirally separated SWNT aggregation. Increasing salt concentration and introduction of divalent cations caused aggregation of SWNT clusters by suppressing the electrostatic repulsive interaction from the oxidized surfaces. The (6,5) SWNTs, i.e., SG65, with relatively lower diameter tubes compared to (7,6), i.e., SG76, showed substantially higher stability (7- and 5-fold for NaCl and CaCl2, respectively). The critical coagulation concentration (CCC) values were 96 and 13 mM NaCl in the case of NaCl and 2.8 and 0.6 mM CaCl2 for SG65 and SG76, respectively. The increased tube diameter for (7,6) armchair SWNTs likely presented with higher van...
52 citations
TL;DR: In this paper, the adsorptive capacity of carbon nanomaterials (CNMs) for the removal of endocrine disrupting compounds (EDCs) was investigated via molecular dynamics simulations and adsorption experiments.
34 citations
TL;DR: Fractal dimensions of covalently functionalized chiral specific semiconducting single-walled carbon nanotubes was systematically studied employing static light scattering (SLS) and Steric hindrance to aggregation was identified as the key mechanism for creating the fractal structures.
24 citations
TL;DR: Solubilization with controllable size and non-aggregating behavior can facilitate application enhancement and mechanistic environmental and toxicological studies of size-specific fullerenes.
Abstract: Size-tunable stable aqueous fullerenes were prepared with different concentrations of biocompatible block-copolymer pluronic (PA) F-127, ranging from 0.001% to 1% (w/v). Size uniformity increased with the increase in PA concentration, yielding optimum 58.8 ± 5.6 and 61.8 ± 5.6 nm nC60s and nC70s, respectively (0.10%w/v PA), as observed using a dynamic light scattering technique. Fullerene aqueous suspensions also manifested enhanced stability in saline solution, Dulbecco’s modified Eagle medium (DMEM), and Roswell Park Memorial Institute (RPMI) culture medium. Transmission electron microscopy was performed to elaborate on the morphology and size specificity of fullerene clusters. Physicochemical characterizations of the suspended fullerenes were performed through UV–vis spectroscopy and electrophoretic mobility measurements. PA molecules showed size restriction by encasement, as observed via molecular dynamics simulations. Such solubilization with controllable size and non-aggregating behavior can facilitate application enhancement and mechanistic environmental and toxicological studies of size-specific fullerenes.
16 citations