Colored effluents are one of the important environment pollution sources since they contain unused dye compounds which are toxic and less-biodegradable. In this work removal of Acid Red 14 and Acid Red 18 azo dyes was investigated by acidic treated pumice stone as an efficient adsorbent at various experimental conditions. Removal of dye increased with increase in contact time and initial dye co...

Concrete's drawback is its low tensile strength and heavy weight, which may exceed 2400 kg/m3. The significance of self-weight in building construction essential, particularly when dealing with seismic loads. larger the inertial force from weight structure itself, greater therefore lightweight concrete can provide an opportunity to lower own a smaller unit 1850 Fly ash was employed as substitut...

background: in recent years, proficient treatment of wastewaters containing recalcitrant and toxic compounds such as phenol has been a challenge. this study introduced and evaluated an efficient option for treating such wastewater . methods: this experimental study was performed on phenol removal as a recalcitrant and toxic compound in aqueous solutions in 2011. the pumice stone was collected f...

The rubbing application of a hydrochloric acid-pumice mixture has been advocated for the removal of fluorotic-like areas of permanent teeth. However, there have been no previous reports as to the amount of enamel removed during this process. The objective of this project was to measure the amount of enamel lost during successive rubbing applications of an 18% HCl-pumice mixture. Nine extracted ...

In February and March 2022, a large amount of pumice stone appeared along the shoreline Thailand. Pumice is type extrusive volcanic rock, since there are no volcanoes in Gulf Thailand, an interesting question was where stones originated from. Another whether could be vehicle for microplastics (MPs) which then journey across ocean until reaching coast A preliminary study begun, randomly collecte...

Large amounts of pumice stone generated by the submarine volcanic eruption at Fukutoku Okanoba on 13 August 2021 drifted ashore, affecting ship navigation and fishery operations posing challenges for disposal a risk to benthic sea-life. As new approach managing ejected from eruptions, we investigated possibility using as sand-capping material eutrophic sediments through laboratory experiments. ...

Abstract Many species of seabird ingest or are provisioned with pumice stones, buoyant volcanic rocks that thought to aide in digestion, occasionally during times poor prey availability. Unlike other indigestible matter, like plastics, the effect on chick growth, its relationship ingested and variation among years has not yet been examined. We analysed amount from 739 Flesh-footed ( Ardenna car...

Pumice quarried by LAVA MINING AND QUARRYING SA from Yali Island, Dodecanese, is used in domestic and foreign markets mainly as concrete lightweight aggregate, masonry unit constituents, road substrate, loose soil stabilization. It a porous natural volcanic rock with low density, thermal noise transmission, the highest strength among all or artificial materials of mineral origin. Nowadays, pumi...

A new influx of sea-rafted pumice reached the eastern coast of Australia in October 2002, approximately 1 year after a felsic, shallow-marine explosive eruption at a previously unknown volcano (0403-091) along the Tofua volcanic arc (Tonga). The eruption produced floating pumice rafts that first became stranded in Fiji in November 2001, approximately 1 month after the eruption. Strandings of se...

in this work, removal of c. i. acid red 14 was investigated by pumice stone as a low cost adsorbent. various parameters such as initial dye solution, contact time and ph were studied. removal of dye were increased by increasing of contact time and initial dye solution and deceased by increasing of ph. three isotherm models were studied. linear and non-linear regression analyses were used for de...