Fixed bed adsorption of diquat dibromide from aqueous solution using carbon nanotubes

Dichiara, Anthony B.; Harlander, Samuel F.; Rogers, Ryan

doi:10.1039/c5ra11167f

Cited by 32 publications

(23 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was shown in previous studies that the adsorption affinity of water vapor positively correlated with the surface hydrophilicity of adsorbents. , The observations made herein indicate that the surface of N-MCNT was more hydrophilic than the surface of MCNT, attributing to the highly-polar- or highly-ionizable-surface nitrogen groups. The higher surface hydrophilicity of N-MCNT would provide an extra benefit to enhance mass transfer and hydrodynamics in a nanotube-packed column or a nanotube-incorporated membrane that has shown a great potential in water and wastewater treatment. ,− …”

Section: Resultsmentioning

confidence: 99%

Enhanced Adsorption of Hydroxyl- and Amino-Substituted Aromatic Chemicals to Nitrogen-Doped Multiwall Carbon Nanotubes: A Combined Batch and Theoretical Calculation Study

Zuo

Guo

Xiao

et al. 2015

Environ. Sci. Technol.

View full text Add to dashboard Cite

A large effort is being made to develop nanosorbents with tunable surface chemistry for enhanced adsorption affinity and selectivity toward target organic contaminants. Heteroatom N-doped multiwall carbon nanotubes (N-MCNT) were synthesized by chemical vapor deposition of pyridine and were further investigated for the adsorptive removal of several aromatic chemicals varying in electronic donor and acceptor ability from aqueous solutions using a batch technique. Compared with commercial nondoped multiwall carbon nanotubes (MCNT), N-MCNT had similar specific surface area, morphology, and pore-size distribution but more hydrophilic surfaces and more surface defects due to the doping of graphitic and pyridinic N atoms. N-MCNT exhibited enhanced adsorption (2-10 folds) for the π-donor chemicals (2-naphthol and 1-naphthalmine) at pH ∼6 but similar adsorption for the weak π-donor chemical (naphthalene) and even lower adsorption (up to a 2-fold change) for the π-acceptor chemical (1,3-dinitrobenzene). The enhanced adsorption of 2-naphthol and 1-naphthalmine to N-MCNT was mainly attributed to the favored π-π electron-donor-acceptor (EDA) interaction between the π-donor adsorbate molecule and the polarized N-heterocyclic aromatic ring (π-acceptor) on N-MCNT. The proposed adsorption enhancement mechanisms were further tested through the pH effects on adsorption and the density function theory (DFT) calculation. The results show for the first time that the adsorptive interaction of π-donor aromatic compounds with carbon nanomaterials can be facilitated by N-doping.

show abstract

Section: Resultsmentioning

confidence: 99%

Enhanced Adsorption of Hydroxyl- and Amino-Substituted Aromatic Chemicals to Nitrogen-Doped Multiwall Carbon Nanotubes: A Combined Batch and Theoretical Calculation Study

Zuo

Guo

Xiao

et al. 2015

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…SWCNTs and MWCNTs were used for the removal of diquat dibromide in the fixed bed system. The results were not higher than those of the batch system, but the pesticide absorbed completely in the fixed bed system by increasing the time [276].…”

Section: Removal Of Organicsmentioning

confidence: 56%

“…The lower density of electrons on the surface of semiconductor CNTs were found to facilitate higher adsorption [275]. On the other hand, during the batch modes, the pesticide removal was found to be limited [276]. SWCNTs and MWCNTs were used for the removal of diquat dibromide in the fixed bed system.…”

Section: Removal Of Organicsmentioning

confidence: 99%

Functionalized Carbon Nanotubes (CNTs) for Water and Wastewater Treatment: Preparation to Application

et al. 2021

View full text Add to dashboard Cite

As the world human population and industrialization keep growing, the water availability issue has forced scientists, engineers, and legislators of water supply industries to better manage water resources. Pollutant removals from wastewaters are crucial to ensure qualities of available water resources (including natural water bodies or reclaimed waters). Diverse techniques have been developed to deal with water quality concerns. Carbon based nanomaterials, especially carbon nanotubes (CNTs) with their high specific surface area and associated adsorption sites, have drawn a special focus in environmental applications, especially water and wastewater treatment. This critical review summarizes recent developments and adsorption behaviors of CNTs used to remove organics or heavy metal ions from contaminated waters via adsorption and inactivation of biological species associated with CNTs. Foci include CNTs synthesis, purification, and surface modifications or functionalization, followed by their characterization methods and the effect of water chemistry on adsorption capacities and removal mechanisms. Functionalized CNTs have been proven to be promising nanomaterials for the decontamination of waters due to their high adsorption capacity. However, most of the functional CNT applications are limited to lab-scale experiments only. Feasibility of their large-scale/industrial applications with cost-effective ways of synthesis and assessments of their toxicity with better simulating adsorption mechanisms still need to be studied.

show abstract

“…41 Moreover, high regeneration efficiencies have been achieved, although the requisite processes are often energy intensive and environmentally taxing.…”

Section: Introductionmentioning

confidence: 99%

On the Choice of Batch or Fixed Bed Adsorption Processes for Wastewater Treatment

Dichiara

Weinstein

Rogers

2015

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

Newly emerged nanomaterials, such as graphene or carbon nanotubes, are of increasingly widespread importance in environmental remediation, especially in their ability to remove undesirable chemicals from hydrological systems. Despite recent advances, the high cost of these materials and the relative inability to regenerate them hinders their use at larger scales. While it is commonly held that adsorption in fixed bed processes is more efficient than in batch processes, the definition of efficiency needs to be examined closely. In this paper, we show that there exists a critical effluent concentration above which batch processes are more efficient than fixed bed processes from this perspective. This work proposes a simple method to choose either batch or fixed bed processes when the goal is to minimize the quantity of adsorbent needed to remove contaminants to below a specified threshold level. It also provides a systematic set of selfconsistency checks on experimental measurements that may be used for comparative studies of these methods.

show abstract

Fixed bed adsorption of diquat dibromide from aqueous solution using carbon nanotubes

Cited by 32 publications

References 34 publications

Enhanced Adsorption of Hydroxyl- and Amino-Substituted Aromatic Chemicals to Nitrogen-Doped Multiwall Carbon Nanotubes: A Combined Batch and Theoretical Calculation Study

Enhanced Adsorption of Hydroxyl- and Amino-Substituted Aromatic Chemicals to Nitrogen-Doped Multiwall Carbon Nanotubes: A Combined Batch and Theoretical Calculation Study

Functionalized Carbon Nanotubes (CNTs) for Water and Wastewater Treatment: Preparation to Application

On the Choice of Batch or Fixed Bed Adsorption Processes for Wastewater Treatment

Contact Info

Product

Resources

About