Topic
Vermiculite
About: Vermiculite is a research topic. Over the lifetime, 2320 publications have been published within this topic receiving 37142 citations.
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TL;DR: The acid/base-treated vermiculite exhibited good properties as a potential adsorbent for tertiary treatment of wastewater in treatment plants, in particular for cationic species as venlafaxine due to facilitation of diffusion of the species to the interlayer gallery upon such treatment.
Abstract: Removal of emerging pollutants, such as pharmaceuticals, from wastewater is a challenge. Adsorption is a simple and efficient process that can be applied. Clays, which are natural and low-cost materials, have been investigated as adsorbent. In this work, raw vermiculite and its three modified forms (expanded, base, and acid/base treated) were tested for removal of a widely used antidepressant, venlafaxine. Adsorption kinetics followed Elovich’s model for raw vermiculite while the pseudo-2nd order model was a better fit in the case of other materials. Equilibrium followed Langmuir’s model for the raw and the acid/base-treated vermiculite, while Redlich-Peterson’s model fitted better the expanded and the base-treated materials. The adsorption capacity of vermiculite was significantly influenced by the changes in the physical and chemical properties of the materials caused by the treatments. The base-treated, raw, and expanded vermiculites showed lower maximum adsorption capacities (i.e., 6.3 ± 0.5, 5.8 ± 0.7, 3.9 ± 0.2 mg g−1, respectively) than the acid/base-treated material (33 ± 4 mg g−1). The acid/base-treated vermiculite exhibited good properties as a potential adsorbent for tertiary treatment of wastewater in treatment plants, in particular for cationic species as venlafaxine due to facilitation of diffusion of the species to the interlayer gallery upon such treatment.
18 citations
Patent•
16 Jan 1979
TL;DR: A water retardant composition comprising a mixture of a low density granular material and a finally divided limestone or other carbonate or silicate mineral particles also coated with a water repellant material is proposed in this article.
Abstract: A water retardant composition comprising a mixture of a low density granular mineral material coated with a water repellant material, and a finally divided limestone or other carbonate or silicate mineral particles also coated with a water repellant material. The low density granular mineral material is preferably selected from the group consisting of expanded perlite, expanded vermiculite, expanded shale and pumice rock. The carbonate or silicate mineral particles are preferably selected from the group consisting of talc, clay, sericite, unexpanded perlite, magnesium silicate and aluminum silicate. Preferably, the low density granular mineral material is coated with a silicone or asphalt, while the limestone or other carbonate or silicate mineral material is preferably coated with a silicone or a salt of stearic acid. The composition exhibits excellent load bearing properties and resistance to water penetration through the matrix and provides improved thermal insulation and corrosion protection when packed around underground structures.
18 citations
TL;DR: In this article, form-stable phase change materials for thermal energy storage consisting of Erythritol as the phase change material (PCM) and Vermiculite as a supporting material (SM).
18 citations
TL;DR: In a field experiment in which heavy applications of liquid dairy manure were added annually for 6'yr to a vermiculite-containing corn-cropped sandy clay loam soil (Mountain series), fixation poten...
Abstract: In a field experiment in which heavy applications of liquid dairy manure were added annually for 6 yr to a vermiculite-containing corn-cropped sandy clay loam soil (Mountain series), fixation poten...
18 citations
TL;DR: The authors examined structural alterations of phlogopite, a trioctahedral mica, when exposed to acid, iron-and sulfate-rich solutions typical of bioleaching systems.
18 citations