Water adsorption dynamics in active carbon probed by terahertz spectroscopy

Abstract

It is vital to characterize the adsorption dynamics in oil–gas reservoirs and pollution control industry.

Preparation of magnetic porous NiFe2O4/SiO2 composite xerogels for potential application in adsorption of Ce(iv) ions from aqueous solution

“…In contrast to other methods, adsorption has shown great promise for selective separation of Pu from HLLW, and nding an effective material to dispose of radioactive waste has become the research focus. There are varieties of adsorbents such as active carbon, [14][15][16] carbon nano-tubes, [17][18][19] zeolites, [20][21][22] molecular sieves, [23][24][25] ionexchange membranes, [26][27][28] and bio-adsorbents. 29 Among all of these kinds of materials, silica xerogels with high specic surface area (500-1500 m 2 g À1 ), pore volume (0.03-0.35 g cm À3 ), high porosity (80-99%) and plenty of silanol groups (Si-OH) distributed on the surface could be promising materials to use as effective adsorbents for radionuclides.…”

Reliable Evaluation of Oil–Water Two-Phase Flow Using a Method Based on Terahertz Time-Domain Spectroscopy

“…A new oil–water test facility suitable for optical measurement is designed, constructed, and operated in this work to investigate the flow pattern transition and slip phenomenon in a horizontal circular pipe. The terahertz (THz) wave is used in the experiment because of its different responses of oil, water, and gas as a result of divergences in molecular configuration of them. − Terahertz time-domain spectroscopy (THz-TDS) technology has drawn more and more attention on applications in the energy field, especially in the petroleum industry. − Owing to the sensitivity of THz to the fluctuations of water dipole moments that occur on the picoseconds (ps) time scale, the THz technology can detect the subtle change of water molecules . A new means has been proposed to monitor the dynamic process of oil–water two-phase flow using THz-TDS.…”

Sensor Technology Options for Municipal Solid Waste Characterization for Optimal Operation of Waste-to-Energy Plants

“…For the frequency-domain, intensity measurements of moisture content in wood [70,71], biomass [11], concrete [70,72], and paper [45] have been performed, whereas for THz imaging, moisture content in leaf [73], soil [74], wood [71], and biomass [11] have been measured. THz time-domain spectroscopy measurements have been performed to detect moisture in rapeseed leaves [75], paper [76], polyamide and wood plastic composites [77], food wafers [78], and active carbon pores [79]. For THz imaging with time domain spectroscopy, moisture content in paper [76] and polyamide and wood plastic components [77] have been measured.…”