Mechanochemically activated saponite as materials for Cu2+ and Ni2+ removal from aqueous solutions

Petra, Lukáš; Billik, Peter; Melichová, Zuzana; Komadel, Peter

doi:10.1016/j.clay.2017.03.012

Cited by 27 publications

(20 citation statements)

References 47 publications

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“…A 0.1 g sample of sorbent was introduced into a conical flask of 100 cm 3 and 50 cm 3 of a 0.1 M NaCl solution was added and the flasks were shaken on the shaker for 60 min. The contents of the flasks were transferred into beakers per 100 cm 3 , and after settling for 10 minutes, solution was decanted with following measurement of its optical density at a wavelength of 400 nm and a cell length of 1 cm. 0.1 M NaCl was the reference solution.…”

Section: Methods Of Researchmentioning

confidence: 99%

“…In particular, montmorillonite, due to its developed specific surface and sufficiently high cationexchange capac ity (up to 120-140 mmol/g), due to the presence of non stoichiometric isomorphic substitutions in the structure, is often chosen as an object of additional modification. Among such methods, mechanochemical or hydrothermal treatment is isolated during which the structure of the mineral is partially destroyed and new active centers ap pear [2,3]. Acid activation also makes it possible to improve cer tain properties of clay minerals.…”

Section: Research Of Existing Solutions Of the Problemmentioning

confidence: 99%

“…Sufficiently high values of the limiting MB adsorption in the range 0-0.5 % SiO 2 are related, first of all, to the MB dimerization. The molecules (ions) of methylene blue, both in solutions and on the surface, are characterized by the formation of dimers even at concentrations of 2 mg/dm 3 [23], and increasing the ionic strength of the solution increases the content of dimers [24].…”

Section: Fig 2 Diffractograms Of Samples Of Nanocomposites With Difmentioning

confidence: 99%

See 2 more Smart Citations

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: Methods Of Researchmentioning

confidence: 99%

Section: Research Of Existing Solutions Of the Problemmentioning

confidence: 99%

Section: Fig 2 Diffractograms Of Samples Of Nanocomposites With Difmentioning

confidence: 99%

See 1 more Smart Citation

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

Doroshenko

Pylypenko

Kornilovych

et al. 2018

TAPR

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“…Those values are higher than q m calculated in a previous study [40] where the maximum adsorption capacity of copper on acid-activated palygorskitewas 93.02 mg/g. Petra et al found q m 295 mg/g for the adsorption of Cu 2+ on activated saponite and 129 mg/g for Ni 2+ on the same adsorbent [41]. In addition, Igherase and coworkers [42] demonstrated that the maximum adsorption capacity of Cu 2+ on polyaniline-grafted chitosan was 83.30 mg/g.…”

Section: Freundlich Isothermmentioning

confidence: 98%

Formation of Palygorskite Clay from Treated Diatomite and its Application for the Removal of Heavy Metals from Aqueous Solution

Nefzi

Abderrabba

Ayadi

et al. 2018

Water

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Environmental contamination by toxic heavy metals is a serious worldwide phenomenon. Thus, their removal is a crucial issue. In this study, we found an efficient adsorbent to remove Cu2+ and Ni2+ from aqueous solution using two materials. Chemical modification was used to obtain palygorskite clay from diatomite. The adsorbents were characterized using X-ray florescence, Fourier transform infrared spectroscopy and X-ray diffraction. The effects of contact time, initial concentration, temperature and pH on the adsorption process were investigated. Our results showed that the (%) of maximum adsorption capacity of diatomite was 78.44% for Cu2+ at pH 4 and 77.3% for Ni2+ at pH 7, while the (%) of the maximum adsorption on palygorskite reached 91% for Cu2+ and 87.05% for Ni2+, in the same condition. The results indicate that the pseudo-second-order model can describe the adsorption process. Furthermore, the adsorption isotherms could be adopted by the Langmuir and the Freundlich models with good correlation coefficient (R2). Thus, our results showed that palygorskite prepared from Tunisian diatomite is a good adsorbent for the removal of heavy metals from water.

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“…Saponite is known [61][62][63][64][65][66][67][68][69][70][71][72][73][74] to be used in various technological processes as an ingredient of sorbents, catalysts, carrying agents, thickeners and pigments, either in natural or activated form.…”

Section: Application Of Saponite In Various Technology Processesmentioning

confidence: 99%

Advanced Techniques of Saponite Recovery from Diamond Processing Plant Water and Areas of Saponite Application

et al. 2018

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Methods of cleaning and processing of saponite-containing water from diamond processing plants in the Arkhangelsk region, Russia, are discussed. The advantages of electrochemical separation of saponite from process water enabling to change its structural-texture, physico-chemical and mechanical properties are demonstrated. Possible areas of saponite and modified-saponite products application are considered.

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Mechanochemically activated saponite as materials for Cu2+ and Ni2+ removal from aqueous solutions

Cited by 27 publications

References 47 publications

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

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

Formation of Palygorskite Clay from Treated Diatomite and its Application for the Removal of Heavy Metals from Aqueous Solution

Advanced Techniques of Saponite Recovery from Diamond Processing Plant Water and Areas of Saponite Application

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