As an innovative technology for the stimulation of coalbed methane, liquid nitrogen cold soaking can produce more fractures in coal body and effectively increase permeability seam. The pore structure distribution affects determines flow occurrence state methane other fluids coal. This paper carries out a number nuclear magnetic resonance tests on samples with different qualities treated by studies influence law structures. It is found that makes T2 spectral peak shifts to right, anthracite...

Abstract Double-walled metal-organic frameworks (MOFs), synthesized using Zn and Co, are potential porous materials for trace benzene adsorption. Aluminum is with low-toxicity abundance in nature, comparison Co. Therefore, a double-walled Al-based MOF, named as ZJU-520(Al), large microporous specific surface area of 2235 m 2 g –1 , pore size distribution the range 9.26–12.99 Å excellent chemical stability, was synthesized. ZJU-520(Al) consisted by helical chain AlO 6 clusters...

Increased desorption of hydrophobic organic compounds (HOCs) from soils and sediments is a key to the remediation contaminated groundwater. In this study, phenanthrene soil by mixed solutions nonionic surfactant (octylphenol polyethoxylate, TX100) an anionic (sodium dodecylbenzenesulfonate, SDBS) was investigated. Phenanthrene depended on not only aqueous concentrations solubility enhancement but also soil-sorbed amount corresponding sorption capacity sorbed surfactants. The added critical...

The pore size distribution (PSD) and fractal dimension of tight sandstone are studied with mercury intrusion porosimetry (MIP). Four different models used to calculate dimensions from capillary pressure (MICP) extrusion (MECP) respectively, the physical meanings calculated discussed. characteristics spaces unimodal bimodal PSD compared. correlations between petrophysical properties researched, optimal model for formation evaluation is recommended. Finally, key parameters influencing...

Tight oil sandstones have the characteristics of narrow pore throats, complex structures and strong heterogeneities. Using nuclear magnetic resonance (NMR) mercury intrusion porosimetry (MIP), this paper presents an advanced fractal analysis petrophysical properties tight from Yanchang Formation, Ordos Basin China. Firstly, nine typical sandstone core samples were selected to conduct NMR MIP test for structure characterization. Next, with size distribution derived MIP, it was found that...

Metal-organic frameworks (MOFs) are potential porous adsorbents for benzene, toluene, ethylbenzene and xylene (BTEX). A novel MOF, using low toxic aluminum (Al) as the metal, named ZJU-620(Al), with uniform micropore size of 8.37±0.73 Å specific surface area 1347 m2 g-1 , was synthesized. It is constructed by one-dimensional rod-shaped AlO6 clusters, formate ligands 4,4',4''-(2,4,6-trimethylbenzene-1,3,5-triyl) tribenzoic ligands. ZJU-620(Al) exhibits excellent chemical-thermal stability...

Spontaneous imbibition is an important phenomenon in tight reservoirs. The existence of a large number fractures and micro-nano pores the key factor affecting spontaneous In this study, based on high-pressure mercury injection nuclear magnetic resonance experiments, pore distribution sandstone described. influence fractures, core porosity permeability, surfactants are studied by physical fracturing, interfacial tension test, wettability test experiments. results show that: radius...

Abstract The water evaporation rate of 3D solar evaporator heavily relies on the transport height evaporator. In this work, a featuring soil capillary‐like structure is designed by surface coating native balsa wood using potassium hydroxide activated carbon (KAC). This KAC‐coated can up to 32 cm, surpassing that ≈8 times. Moreover, under 1 kW m −2 radiation without wind, exhibits remarkable 25.3 kg h −1 , ranking among highest compared with other reported evaporators. exceptional...

Surfactants are used in synthesis and dispersion of carbon nanotubes (CNTs) can thus be released into the environment with CNTs. In this study, it was observed that coupled release surfactants CNTs altered sorption organic contaminants on The cationic surfactant, cetylpyridinium chloride (CPC), decreased naphthalene single-walled (SWCNT). most dramatic example, adsorption capacity SWCNT reduced from 240 to 61.1 mg/g. decrease could largely attributed competition adsorbed CPC cations (i.e.,...

The characteristics of the nanopore structure in shale, tight sandstone and mudstone from Ordos Basin China were investigated by X-ray diffraction (XRD) analysis, porosity permeability tests low-pressure nitrogen adsorption experiments. Fractal dimensions D1 D2 determined low relative pressure range (0 < P/P0 0.4) high (0.4 1) data, respectively, using Frenkel–Halsey–Hill (FHH) model. Relationships between pore parameters, mineral compositions fractal investigated. According to...

A superhydrophobic hypercrosslinked microporous polymer adsorbent, <bold>SHMP-1</bold> was synthesized from 1,3,5-trinaphthylbenzene by cross-linking of methylene. has the largest specific surface area 2100 m² g⁻¹ among materials.

This study aims to investigate the mechanism behind surfactant enhanced oil recovery under reservoir conditions through experiments on spontaneous imbibition with surfactants. The tight sandstone samples are characterized using cast thin section (CTS), high-pressure mercury intrusion (HPMI), and nuclear magnetic resonance (NMR) determine their clay mineral composition, pore size distribution, fluid distribution. Spontaneous then conducted formation water solutions as liquids, three different...

Abstract Based on the experiments of nitrogen gas adsorption (N 2 GA) and nuclear magnetic resonance (NMR), multifractal characteristics pore structures in shale tight sandstone from Chang 7 member Triassic Yanchang Formation Ordos Basin, NW China, are investigated. The spectra obtained N GA NMR analyzed with throat structure parameters. results show that size distributions different, vary each other. specific surface total volume by experiment have correlations characteristics. For core...

This work provides a new strategy using nanomaterial-facilitated phytoremediation to promote the restoration of POP-contaminated soils.

A series of NH2-functionalized nano-sized magnetic metal–organic frameworks (MOFs) were prepared in this study for Cr(VI) removal from wastewater. It was observed that not only the morphological, i.e., orientation growth N-doped and iron-based frameworks, but also adsorption MOFs is largely related to used amount ammonium hydroxide preparation. For example, with increasing amounts preparation, morphology changed spherical cube triangular cone. Moreover, maximum capacity spherical-magnetic...