Silica-based mesoporous materials; emerging designer adsorbents for aqueous pollutants removal and water treatment

Diagboya, Paul N.; Dikio, Ezekiel Dixon

doi:10.1016/j.micromeso.2018.03.008

Cited by 221 publications

(103 citation statements)

References 121 publications

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“…Silica gel and other silica derivatives have found wide application in sorption processes [14]. The preparation of composite materials based on clay minerals together with silica opens the way to obtaining new functional materials, which is the aim of this work.…”

Section: Research Of Existing Solutions Of the Problemmentioning

confidence: 99%

Preparation of porous silica nanocomposites from montmorillonite using sol-gel approach

Doroshenko

Pylypenko

Kornilovych

et al. 2018

TAPR

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Об'єктом дослiдження є монтморилонiт, який завдяки своїм властивостям i будовi проявляє високi сорбцiйнi характеристики. Однак суттєвою перешкодою його використання в промислових технологiях водоочищення є схильнiсть монтморилонiту самочинно диспергуватись в водних розчинах на елементарнi структурнi пакети i утворювати стiйкi зависi. Це призводить до виникнення складнощiв при роздiленнi твердої i рiдкої фаз пiсля проведення процесу сорбцiї. Авторами був використаний золь-гель метод синтезу нанокомпозитних матерiалiв на основi монтморилонiту з використанням тетраетоксисилану в якостi гелеутворюючої речовини. Синтез включає в себе реакцiю гiдролiзу тетраетоксисилану i наступною полiконденсацiєю молекул кремнекислоти з гiдроксильними групами монтморилонiту. Отриманi зразки поєднують в собi хорошi сорбцiйнi властивостi шаруватого мiнералу та мiцну каркасну структуру. Така структура синтезованих нанокомпозитiв забезпечується наявнiстю силоксанових зв'язкiв, якими елементарнi пакети монтморилонiту з'єднанi мiж собою. Це, в свою чергу, сприяє збiльшенню водостiйкостi експериментальних зразкiв. Згiдно з результатами реологiчних дослiджень, основнi процеси структуроутворення у вихiдних водно-спиртових суспензiях продуктiв гiдролiзу тетраетоксисилану та монтморилонiту вiдбуваються при концентрацiї кремнезему 1 %, що пов'язано з колоїдно-хiмiчними властивостями дослiджуваних систем. Обробка монтморилонiту продуктами гiдролiзу тетраетоксисилану приводить до утворення матерiалу з нижчою здатнiстю до набухання та кращим роздiленням рiдкої та твердої фаз. Оптимальний вмiст кремнезему у зразку, який знаходиться в iнтервалi 0,1-14 %, дає змогу зменшити оптичну густину розчинiв у 2,5 рази у порiвняннi з вихiдним монтморилонiтом. Синтезованi матерiали зберiгають достатньо високу сорбцiйну ємнiсть щодо вилучення катiонного барвника метиленового блакитного (до 158 мг/г), яка зростає при збiльшеннi вмiсту глинистого мiнералу. А також мають вищу селективнiсть (до 3,4 дм 3 /мг).

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Section: Research Of Existing Solutions Of the Problemmentioning

confidence: 99%

Preparation of porous silica nanocomposites from montmorillonite using sol-gel approach

Doroshenko

Pylypenko

Kornilovych

et al. 2018

TAPR

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“…Numerous studies focused on developing novel functionalized silica-based sorbents is stimulated by the need to meet the stringent criteria of real environments such as high adsorption capacity, superb selectivity, prolonged service-life, easier and faster regeneration with minimal capacity loss, excellent mechanical stability, low toxicity, and low cost [12][13][14][15][16][17]. However, there are only few reports on silica-based adsorbents which are capable of selectively adsorbing a wide range of heavy metal ions in the presence other ions such as Na + and Ca ++ with long-term stability upon adsorption-desorption cycling and convenient regeneration ability under mild conditions [18][19][20]. erefore, there is need to develop a novel single material fulfilling all these aforementioned requirements.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Heavy Metal Ions Chelating Properties of Multifunctional Polymer-Grafted Silica Hybrid Materials

Sartore

Dey

2019

Advances in Materials Science and Engineering

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In this research work, novel hybrid materials based on multifunctional polymers and silica were developed and investigated in view of possible employment as sorbents for removal of heavy metal ions from water in presence of various ions. Organic-inorganic hybrid materials were prepared by covalent bonding of vinyl-terminated polyamidoamine (PAA) onto aminated silica particles. Two series of polyamidoamine-grafted silica, differing in the PAA chemical structure, were synthesized, and their heavy metal ions chelating properties were investigated. Column adsorption procedure for Cu, Zn, and Ni in aqueous solution was successfully established. Moreover, the adsorption behaviour of the materials was evaluated in different ionic strength solutions as well as in distilled and natural water. Organic-inorganic hybrid materials exhibited excellent chelating properties and selectivity for different metal ions. The hybrid columns showed exceptional eluting and regenerating property using diluted hydrochloric acid solution as eluent. In particular, the hybrid materials containing more carboxy groups possessed superior adsorption ability, reusability, and stability. The consecutive adsorption-desorption experiments exhibited that this material could be reused more than 20 cycles without almost any loss of adsorption capability. These new organic-inorganic sorbents appear very promising as an effective solid-phase extraction material for the selective preconcentration or removing of heavy metal ions from the environment.

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“…The synthetic silica-based inorganic sorbents are obtained using different methods of the sorbent surface functionalization for enhancing the selectivity. Such methods, primarily, involve the use of silicone compounds containing active acid groups (SH, COOH, P(O)(OH) 2 ), basic groups (primary, secondary and tertiary amino groups, pyridine) and their combination [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Uranium (VI) from Aqueous Solutions by Amino-functionalized Clay Minerals

Тобілко

Spasonova

Kovalchuk

et al. 2019

Colloids and Interfaces

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Silylation of clay minerals from Cherkasy deposit (Ukraine) montmorillonite (layer silicate) and palygorskite (fibrous silicate) was performed using organosilane (3-aminopropyl)triethoxysilane (APTES). Solvents with different polarity (ethanol, toluene) were used in synthesis. The structure of modified minerals was characterized by complex of methods (X-ray powder diffraction, Fourier transform infrared spectroscopy, nitrogen adsorption-desorption at −196 °C and thermal analysis). Studies of adsorption characteristics of APTES-modified clay minerals were carried out in relation to uranium (VI). The results indicated that modified montmorillonite and palygorskite were effective materials for water purification from UO22+.

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Silica-based mesoporous materials; emerging designer adsorbents for aqueous pollutants removal and water treatment

Cited by 221 publications

References 121 publications

Preparation of porous silica nanocomposites from montmorillonite using sol-gel approach

Preparation of porous silica nanocomposites from montmorillonite using sol-gel approach

Preparation and Heavy Metal Ions Chelating Properties of Multifunctional Polymer-Grafted Silica Hybrid Materials

Adsorption of Uranium (VI) from Aqueous Solutions by Amino-functionalized Clay Minerals

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