Efficient removal of hazardous lead, cadmium, and arsenic from aqueous environment by iron oxide modified clay-activated carbon composite beads

Pawar, Radheshyam R.; Lalhmunsiama,; Kim, Munui; Kim, Jae-Gyu; Hong, Seung-Ug; Sawant, Sandesh Y.; Lee, Seung Mok

doi:10.1016/j.clay.2018.06.014

Cited by 195 publications

(44 citation statements)

References 57 publications

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“…Composite sorption materials, which include not only clay minerals but also other components, for example, metal hydroxides, activated carbon, ion exchange resins, are also quite common [13].…”

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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“…In recent years, heavy metal removal has gained research attention due to its high toxicity, adverse environmental and health issues (Pawar et al 2018;Wang et al 2018). From health's viewpoint, most of the heavy metals in the environment can be easily bio-accumulated and do not decompose in food chains (Keochaiyom et al 2017;Peng et al 2017).…”

Section: Introductionmentioning

confidence: 99%

“…copper (Cu), iron (Fe), zinc (Zn), manganese (Mn), chromium (Cr), etc.] in the human body, but their exposure and daily intake at higher doses may cause harmful effects to organisms (Pawar et al 2018;Zubair et al 2017). The other toxic heavy metal ions [cadmium (Cd), metalloids arsenic (As(III, V)), etc.]…”

Section: Introductionmentioning

confidence: 99%

Simultaneous removal of Cd(II) and As(III) from co-contaminated aqueous solution by α-FeOOH modified biochar

Zhu

Irshad

et al. 2020

Biochar

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A novel α-FeOOH modified wheat straw biochar (α-FeOOH@BC) was developed and the findings of the current study showed that α-FeOOH@BC is an efficient material for the simultaneous removal of cations (Cd(II)) and anions (As(III)) from aqueous solutions. The SEM, FTIR, and XRD analysis proved that α-FeOOH@BC was covered by α-FeOOH. In the single adsorption system, the maximum adsorption capacities of α-FeOOH@BC for Cd(II) and As(III) were 62.9 and 78.3 mg/g, respectively. In the dual adsorption system, the maximum adsorption capacities of α-FeOOH@BC for Cd(II) and As(III) dropped to 39.3 and 67.2 mg/g, respectively. The adsorption capacities of Cd(II) and As(III) by α-FeOOH@BC were much higher by BC and α-FeOOH both in single and dual adsorbate system. The adsorption results were well fitted by the Langmuir and pseudo-second-order kinetics models. The Cd(II) and As(III) co-adsorption on α-FeOOH@BC had a competitive effect, and the dominant adsorption mechanisms were co-precipitation and ion exchange. Our study showed that α-FeOOH@BC could be an effective remediation material for Cd(II) and As(III) co-adsorption from aqueous environment.

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“…However, a dramatic increase of heavy metals into the environment related to anthropogenic activity such as untreated urban sewage sludge discharge, mining, industrial wastes, smelting and so many other human activities [2]. The occurrence of high levels of toxic metals in the environment has a potential threat to the human [3]. In this context, environmental exposure to cadmium (Cd 2+ ) and copper (Cu 2+ ) ions are associated with health effects on various organs, including bone demineralization, lung cancer, renal disease, and liver injury.…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, it is well known that aquatic ecosystems are directly or indirectly the end destinations of these substances [3] and to preserve environmental quality, management of wastewater containing heavy metals has been one of the most prominent challenges in the past few decades [5]. However, the commonly used procedures to remove the toxic heavy metals (Cu 2+ and Cd 2+ ) from wastewater before discharge into the environment include ion exchange, chemical precipitation, adsorption, membrane filtration, supercritical fluid extraction, electrochemical process, advanced oxidation process and membrane bioreactors [6].…”

Section: Introductionmentioning

confidence: 99%

Removal of heavy metals (Cu2+ and Cd2+) from effluent using gamma irradiation, titanium dioxide nanoparticles and methanol

et al. 2018

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Heavy metal pollution has become one of the most serious environmental problems. The aim of this study was to achieve an efficient treatment process of effluents containing 1 mM copper (Cu 2+) and cadmium (Cd 2+) ions using a combination of gamma irradiation, methanol and TiO 2 nanoparticles under different pH values. The results showed that in acidic conditions, removal of Cu 2+ and Cd 2+ ions by physical adsorption was less than 15% and adsorption of Cd 2+ was more than that of Cu 2+. In the same condition, the Cu 2+ removal percentage by irradiation was greater than that of Cd 2+. In basic solutions, due to precipitation of Cd and Cu hydroxides, it was not possible to carry out adsorption experiments on Cd 2+ and Cu 2+ ions removal by TiO 2 and gamma irradiation. Cu 2+ and Cd 2+ ions removal processes under different conditions could be depicted by the first order kinetics model. The combined application of TiO 2 and methanol enhanced Cu 2+ and Cd 2+ ions removal at all pH levels examined. However, using the combination of TiO 2 and methanol at acidic solutions facilitated completely removal of Cu 2+ and Cd 2+ ions. So that, only using 50 kGy irradiation dose with combination of TiO 2 nanoparticles and methanol led to the removal of 99% of coexisting Cu 2+ and Cd 2+ ions from the acidic wastewater.

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Efficient removal of hazardous lead, cadmium, and arsenic from aqueous environment by iron oxide modified clay-activated carbon composite beads

Cited by 195 publications

References 57 publications

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

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

Simultaneous removal of Cd(II) and As(III) from co-contaminated aqueous solution by α-FeOOH modified biochar

Removal of heavy metals (Cu2+ and Cd2+) from effluent using gamma irradiation, titanium dioxide nanoparticles and methanol

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