Amorphous nanosized Al-Ti-Mn trimetal hydrous oxides: synthesis, characterization and enhanced performance in arsenic removal

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22330%2F16%3A43901853" target="_blank" >RIV/60461373:22330/16:43901853 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61388955:_____/16:00464673 RIV/62243136:_____/16:N0000027

Výsledek na webu

<a href="http://pubs.rsc.org/en/content/articlepdf/2016/ra/c6ra11347h" target="_blank" >http://pubs.rsc.org/en/content/articlepdf/2016/ra/c6ra11347h</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c6ra11347h" target="_blank" >10.1039/c6ra11347h</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Amorphous nanosized Al-Ti-Mn trimetal hydrous oxides: synthesis, characterization and enhanced performance in arsenic removal

Popis výsledku v původním jazyce

Arsenite (As(III)) is more toxic and more difficult to remove from water than arsenate (As(V)). There is no simple treatment for direct efficient removal of As(III), and thus pre-oxidation of As(III) to As(V) is always required to achieve acceptable removal rates. To overcome these disadvantages, we have developed a novel nanosized Al-Ti-Mn trimetal hydrous oxide (ATM) adsorbent material combining the oxidation properties of manganese dioxide and the high capacity of aluminium hydrous oxide and titanium hydrous oxide to adsorb As(V). It was done by simultaneous oxidation and precipitation. The adsorbent was characterized by BET surface area measurement, XRD, TEM, XPS, FTIR and TGA techniques. The characterization provided evidence that the new adsorbent was amorphous, had a relatively high surface area (71 m(2) g(-1)) and consisted of aggregates of many nanosized particles. The adsorption kinetics, the adsorption capacity of the adsorbent and the effect of the pH of the solution on the overall arsenic removal were also studied. The results indicated that the ATM adsorbent performed excellently in removing both As(III) and As(V) from water. The maximum adsorption capacities for As(III) and As(V) calculated from the Langmuir model are 202.7 and 146.7 mg g(-1) (pH 7.0), and 193.3 and 158.6 mg g(-1) (pH 5.0), respectively. These values exceed significantly those reported for other nano-adsorbents. Furthermore, the result of XPS analysis of the adsorbent before and after interaction with As(III) confirmed the oxidation/adsorption mechanism for As(III) uptake by ATM. The comparison of -OH density (OH per g) in fresh ATM and ATM after adsorption of As(III) and As(V) shows that the number of -OH groups on the adsorbent surface was the key factor affecting its adsorption capacity. The amorphous nanosized Al-Ti-Mn trimetal hydrous oxide is thus a promising adsorbent for both As(III) and As(V) removal because of its excellent performance and simple low-cost synthesis process.

Název v anglickém jazyce

Amorphous nanosized Al-Ti-Mn trimetal hydrous oxides: synthesis, characterization and enhanced performance in arsenic removal

Popis výsledku anglicky

Arsenite (As(III)) is more toxic and more difficult to remove from water than arsenate (As(V)). There is no simple treatment for direct efficient removal of As(III), and thus pre-oxidation of As(III) to As(V) is always required to achieve acceptable removal rates. To overcome these disadvantages, we have developed a novel nanosized Al-Ti-Mn trimetal hydrous oxide (ATM) adsorbent material combining the oxidation properties of manganese dioxide and the high capacity of aluminium hydrous oxide and titanium hydrous oxide to adsorb As(V). It was done by simultaneous oxidation and precipitation. The adsorbent was characterized by BET surface area measurement, XRD, TEM, XPS, FTIR and TGA techniques. The characterization provided evidence that the new adsorbent was amorphous, had a relatively high surface area (71 m(2) g(-1)) and consisted of aggregates of many nanosized particles. The adsorption kinetics, the adsorption capacity of the adsorbent and the effect of the pH of the solution on the overall arsenic removal were also studied. The results indicated that the ATM adsorbent performed excellently in removing both As(III) and As(V) from water. The maximum adsorption capacities for As(III) and As(V) calculated from the Langmuir model are 202.7 and 146.7 mg g(-1) (pH 7.0), and 193.3 and 158.6 mg g(-1) (pH 5.0), respectively. These values exceed significantly those reported for other nano-adsorbents. Furthermore, the result of XPS analysis of the adsorbent before and after interaction with As(III) confirmed the oxidation/adsorption mechanism for As(III) uptake by ATM. The comparison of -OH density (OH per g) in fresh ATM and ATM after adsorption of As(III) and As(V) shows that the number of -OH groups on the adsorbent surface was the key factor affecting its adsorption capacity. The amorphous nanosized Al-Ti-Mn trimetal hydrous oxide is thus a promising adsorbent for both As(III) and As(V) removal because of its excellent performance and simple low-cost synthesis process.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DJ - Znečištění a kontrola vody

OECD FORD obor

—

Projekt

<a href="/cs/project/LO1606" target="_blank" >LO1606: Rozvoj Centra UniCRE</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

RSC Advances

ISSN

2046-2069

e-ISSN

—

Svazek periodika

6

Číslo periodika v rámci svazku

103

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

100732-100742

Kód UT WoS článku

000387427700011

EID výsledku v databázi Scopus

2-s2.0-84994013376