Highly selective removal of nitrate and perchlorate by organoclay

Bagherifam, Saeed; Komarneni, Sridhar; Lakzian, Amir; Fotovat, Amir; Khorasani, Reza; Huang, Wenyan; Ma, Jianfeng; Hong, Siqi; Cannon, Fred S.; Wang, Yujue

doi:10.1016/j.clay.2014.03.021

Cited by 107 publications

(43 citation statements)

References 38 publications

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“…Compared with these techniques, adsorption is reported to be one of the simplest and most efficient and economical techniques for removing NO 3 from water (Sowmya and Meenakshi 2014). Materials such as organo-clay, red mud, nanoalumina, ferric hydroxide and activated carbon have been widely examined as sorbents for NO 3 removal from aqueous media (Bagherifam et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Chemically modified biochar produced from conocarpus waste increases NO3 removal from aqueous solutions

Usman

Ahmad

El-Mahrouky

et al. 2015

Environ Geochem Health

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Biochar has emerged as a universal sorbent for the removal of contaminants from water and soil. However, its efficiency is lower than that of commercially available sorbents. Engineering biochar by chemical modification may improve its sorption efficiency. In this study, conocarpus green waste was chemically modified with magnesium and iron oxides and then subjected to thermal pyrolysis to produce biochar. These chemically modified biochars were tested for NO3 removal efficiency from aqueous solutions in batch sorption isothermal and kinetic experiments. The results revealed that MgO-biochar outperformed other biochars with a maximum NO3 sorption capacity of 45.36 mmol kg(-1) predicted by the Langmuir sorption model. The kinetics data were well described by the Type 1 pseudo-second-order model, indicating chemisorption as the dominating mechanism of NO3 sorption onto biochars. Greater efficiency of MgO-biochar was related to its high specific surface area (391.8 m(2) g(-1)) and formation of strong ionic complexes with NO3. At an initial pH of 2, more than 89 % NO3 removal efficiency was observed for all of the biochars. We conclude that chemical modification can alter the surface chemistry of biochar, thereby leading to enhanced sorption capacity compared with simple biochar.

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Section: Introductionmentioning

confidence: 99%

Chemically modified biochar produced from conocarpus waste increases NO3 removal from aqueous solutions

Usman

Ahmad

El-Mahrouky

et al. 2015

Environ Geochem Health

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“…84 Subsequently, Bagherifam et al 85 carried out a study on As(III) and As(V) removal from a simulated soil solution using Zn-Al-SO 4 LDHs as adsorbents. The results revealed that the maximum uptake values of the Zn-Al-SO 4 LDHs on As(III) and As(V) were 34.24 and 47.39 mg g À1 , respectively.…”

Section: Influence Of the Synthesis Methods And Composition Of The Ldhmentioning

confidence: 99%

“…The As(III) adsorption capacity was in the following order: HPO 4 2À < SO 4 simultaneously the predominant species in the solution, they thought that Zn-Al-sulphate LDHs could be successfully used for the treatment of As contaminated water with pH values ranging from circum-neutral to moderately alkaline. In addition, Bagherifam et al 85 carried out an investigation of the effects of two kinds of competing divalent anion (SO 4 2À and CO 3 2À ) on the adsorption of As(III) and As(V). From Fig.…”

Section: Competition With Other Ionsmentioning

confidence: 99%

Arsenic removal from water/wastewater using layered double hydroxide derived adsorbents, a critical review

Wang

Zhang

et al. 2018

RSC Adv.

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Arsenic pollution has become a worldwide environmental concern. Dangerous arsenic concentrations in natural waters threaten the health of millions of people, and this has received significant attention.Among the various technologies that have been developed for arsenic removal from water, the use of adsorption technology is considered to be a prevailing method, because the adsorption approach usually has high removal efficiency and the advantage of convenience of handling. In recent years, layered double hydroxides (LDHs) have become prime candidates for arsenic removal, due to their hydrophilic nature and cationic layered structures. Research on arsenic removal using LDHs is mainly focused on (1) the influence of the synthesis method and composition of the LDH, (2) the influence of the particle size of the LDH, (3) the influence of the Mg/Al ratio in LDHs, (4) LDH-based hybrids and (5) the competition with other anions. This paper provides a review of the currently available literature focusing on arsenic removal using LDHs for the five parts mentioned above. In addition, based on this overview, a closing section will suggest research efforts for future work. It is expected that this review will provide a summary of the main research in this area, and will also shed light on the direction of future development.

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“…Adsorption represents an attractive option as it is considered a simple, fast, and inexpensive method. Various adsorbents have been examined for the removal of this priority pollutant from aqueous solution including organoclays and organosilicas (Bagherifam et al 2014;Seliem et al 2013), graphene (Ganesan et al 2013), red mud (Cengeloglu et al 2006), layered double hydroxides (Islam and Patel 2010), and modified pine sawdust (Keränen et al 2013). Activated carbons are one of the most studied adsorbents, due to their versatility and wide range of application, although these materials are not very effective for the removal of nitrate ions from water (Mukherjee and De 2014;Loganathan et al 2013;Cho et al 2011;Öztürk and Bektas 2004).…”

Section: Introductionmentioning

confidence: 99%

Nitrate Uptake from Water by Means of Tailored Adsorbents

Nunell

Fernández

Bonelli

et al. 2015

Water Air Soil Pollut

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Two different adsorbents directed to nitrate removal from water were developed from Parkinsonia aculeata wood. An activated carbon was obtained by chemical activation with K 2 CO 3 at 800°C, whereas another adsorbent was prepared using a dilute solution of NH 4 Cl at 450°C. Elemental compositions, surface functional groups, and textural parameters of both adsorbents were determined and compared with those of a commercial activated carbon used as a reference. Nitrate adsorption assays were carried out to examine the effects of solution pH, adsorbent dosage, contact time, and equilibrium adsorption isotherms. The adsorbent obtained with K 2 CO 3 showed a well-developed pore structure (S BET =777 m 2 /g; V T =0.35 cm 3 /g) and neutral character, while the one prepared with NH 4 Cl exhibited a low porous development (S BET =58 m 2 /g; V T =0.03 cm 3 /g), acidic nature, and a noticeably high N content. The latter attained the highest nitrate removal efficiency, with a maximum adsorption capacity (X mL =0.40 mmol/g) higher than those estimated for the former (X mL =0.34 mmol/g) and the commercial sample (X mL =0.23 mmol/g), pointing to a predominant role of the chemical surface characteristics, mainly of N-containing groups and basic functionalities. Accordingly, the adsorbent obtained with NH 4 Cl represents a friendly novel material especially suited for nitrate removal.

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Highly selective removal of nitrate and perchlorate by organoclay

Cited by 107 publications

References 38 publications

Chemically modified biochar produced from conocarpus waste increases NO3 removal from aqueous solutions

Chemically modified biochar produced from conocarpus waste increases NO3 removal from aqueous solutions

Arsenic removal from water/wastewater using layered double hydroxide derived adsorbents, a critical review

Nitrate Uptake from Water by Means of Tailored Adsorbents

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