Functionalized multiwall carbon nanotubes by ammonium-based Deep Eutectic Solvent: A new adsorbent for the removal of nickel from water

Publish Year: 1397
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:

ICESIT01_240

تاریخ نمایه سازی: 6 بهمن 1397

Abstract:

The substantial increase in the use of heavy metals in several industrial uses as well as the discharge of untreated industrial wastewater to the environment has definitely resulted an increased amount of metal contamination of different water bodies.Nickel, a heavy metal, although an essential constituent for both plants and animals, is required in very low concentrations. Increased discharge of this heavy metal into the environment has to be contained since nickel exposure to humans causes a headache, dermatitis, dizziness, dry cough, nausea, vomiting, and cyanosis leading to capillary, hepatic and renal damage, nervous disabilities, chest pain, cancer in lungs, nose, bones, etc. Nickel ions in water and wastewater are the cause of major environmental and industrial concern. Among the various physicochemical processes, adsorption has advantages such as flexibility in term of operation, feasibility in term of production of high-quality product, economically viability in the context of initial capital cost and chemicals requirement as well as effectiveness in term of treating pollutants at low concentrations. Carbon nanotubes (CNTs) have proved to be sophisticated adsorbents to remove Ni (II), but require functionalization with non-environmental friendly acids and chemicals through complicated processes. Due to the interestingly tolerated physicochemical properties of deep eutectic solvents (DESs), they are currently in the process of becoming widely used in many fields of science. Substantially, DESs can be simply defined as a mixture of two or more compounds that has a melting point lower than that of each individual compound. Regarding environmental safety, DESs have met many of the criteria necessary to be considered environmentally friendly solvents, including availability, biodegradability, recyclability, flammability, and relatively low price compared to other conventional solvents. Due to DESs’ physicochemical properties, they been used in a variety of applications. This study introduces carbon nanotubes (CNTs) functionalized with Deep Eutectic Solvent (DES) as a novel adsorbent for Ni (II) from the water. Tetra butyl ammonium bromide (TBAB) was combined with glycerol as the hydrogen bond donor (HBD) to form DES, which can act as a novel CNTs functionalization agent. The novel adsorbent was characterized using FTIR, FESEM. Uptake capacities of Ni (II) on the novel adsorbents were optimized by RSM-optimal experimental design. The analytical parameters including the dosage of adsorbent, pH, contact time and temperature. The optimum conditions were found to be pH 6.7 with adsorbent dosage of 10 mg, contact time of 69 min and temperature 55 c. The maximum adsorption capacity of the adsorbent in the optimum point was found to be 24.62 mg/g. new CNT was found to be a suitable adsorbent for the removal of nickel (II) ions from aqueous solutions.

Authors

Neda Rahmati

Department of Chemical Engineering, Noshirvani University of Technology, Babol, Iran

Mostafa Rahimnejad

Department of Chemical Engineering, Noshirvani University of Technology, Babol, Iran

Masomeh Pourali

Department of Chemical Engineering, Noshirvani University of Technology, Babol, Iran