Metal–Organic Framework Based on Isonicotinate N-Oxide for Fast and Highly Efficient Aqueous Phase Cr(VI) Adsorption

Abstract

Synthesis of new porous materials has been developed for efficient capture of pollutants in environmental sciences. Here, the application of a new metal-organic framework (TMU-30) has been reported based on isonicotinate N-oxide as an adsorptive site for fast and highly efficient aqueous phase adsorption of Cr(VI). The adsorption process showed no remarkable effect over a pH range of 2-9. The maximum capacity of the adsorption was reached in just less than 10 min and followed the pseudo-second-order kinetics. The maximum capacity of 2.86 mol mol(-1) (145 mg/g) was obtained according to Langmuir model at 298 K. The spontaneous adsorption and an endothermic process were controlled by positive entropy changes. XPS analysis revealed electrostatic interactions between N-oxide groups of TMU-30 and Cr(VI) species, which were responsible for the adsorption process.

Pore-size-tuned host–guest interactions in Co-MOFs via in situ microcalorimetry: adsorption and magnetism

“…S15). S16), 47,48 verifying the guess. The presence of Cr(VI) species was confirmed by FT-IR spectroscopy.…”

Recent Progress in the Removal of Heavy Metal Ions from Water Using Metal‐Organic Frameworks

“…Herein, Morsali et al. reported a new 3D framework, [Pb(INO) 2 ] 2 (TMU‐30), based on INO consisting of 1D channels . Because of the N‐Oxide group's positive charge, electrostatic interactions with chromate ions will be generated.…”

“…Herein, Morsali et al reported a new 3D framework, [Pb(INO) 2 ] 2 (TMU-30), based on INO consisting of 1D channels. [6] Because of the N-Oxide group's positive charge, electrostatic interactions with chromate ions will be generated. They observed that TMU-30 adsorbed all existing species of Cr VI including HCrO 4 À and CrO 4 2 À over a wide pH range (2 À 9), but the crystalline structure of TMU-30 starts to collapse in pH > 9.…”

“…The permitted amount of contaminants in water is different from industrial waste, which the limit is 49.5–123 mg g −1 for As III , 12.3–303 mg g −1 for As V , 8.40–313 mg g −1 for Pb II , 0.65–2173 mg g −1[2] for Hg II , 0.05–1 mg g −1 for Co II , 14.0–127 mg g −1 for Cr III , 15.4–145 mg g −1 for Cr VI , 0.2–1 mg g −1 for Cu II and 3.63–145 mg g −1 for Cd II , which is determined via the United States Environmental Protection Agency (EPA) . High toxicity and the degradation of these ions in the environment is hazardous to human beings and human health . HMIs in natural waters can exert a lot of side effects on living organisms in various ways, including food and food chain .…”

“…[3,4] High toxicity and the degradation of these ions in the environment is hazardous to human beings and human health. [5][6][7][8] HMIs in natural waters can exert a lot of side effects on living organisms in various ways, including food and food chain. [4,9] This kind of pollution has become an epidemic problem so the removal of HMIs is a major issue in world.…”