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Adsorptive removal of heavy metal ions (HMIs) using L-Glutamic acid treated UIO-66(COOH)2 MOF
Phani B. S. Rallapalli,Deok Hwan Lee,Jae Hoon Lee,Suk Soon Choi,Jeong Hyub Ha 유기성자원학회 2022 유기성자원학회 학술발표대회논문집 Vol.2022 No.추계
Heavy metal ions (HMIs) are produced as a result of fast industrial and agricultural expansion. They are exceedingly hazardous to both humans and the environment, and the necessity to eliminate them from aqueous systems prompted the development of novel materials. Metal-Organic Frameworks (MOFs), a novel class of organic-inorganic hybrid materials, have generated interest in the field of adsorption of HMIs due to the facts of the high material's porous structure, wide surface area, availability of exposed adsorptive sites, and post-synthetic modification capability. In the present study, UIO-66(COOH)2 MOF which contains free carboxylic acid groups was postsynthetically modified with L-Glutamic acid (GA) to produce an analogue of UIO-66(COOH)2 having both amide and free carboxylic acid groups. Pristine and GA treated MOF materials were well characterized with several physico-chemical techniques. The single and diverse ion batch adsorption studies of Cu2+, Pb2+, Hg2+ and Cd2+ ions were carried out using pristine as well as GA treated MOFs. The parameters influencing the removal efficiency such as effect of initial concentration, contact time, adsorbent dosage and cyclic sorption studies were examined.
Adsorptive Removal of Phosphate Ions from Aqueous Solutions using Zirconium Fumarate
( Phani B. S. Rallapalli ),( Jeong Hyub Ha ) 한국공업화학회 2020 공업화학 Vol.31 No.5
In this study, zirconium fumarate of metal-organic framework (MOF-801) was solvothermally synthesized at 130 ℃ and characterized through powder X-ray diffraction (PXRD) analyses and porosity measurements from N<sub>2</sub> sorption isotherms at 77 K. The ability of MOF-801 to act as an adsorbent for the phosphate removal from aqueous solutions at 25 ℃ was investigated. The phosphate removal efficiency (PRE) obtained by 0.05 g/L adsorbent dose at an initial phosphate concentration of 60 ppm after 3 h was 72.47%, whereas at 5 and 20 ppm, the PRE was determined to be 100% and 89.88%, respectively, after 30 min for the same adsorbent dose. Brunauer-Emmett-Teller (BET) surface area and pore volume of the bare MOF-801 sample were 478.25 m<sup>2</sup>/g and 0.52 cm3/g, respectively, whereas after phosphate adsorption (at an initial concentration of 60 ppm, 3 h), the BET surface area and pore volume were reduced to 331.66 m<sup>2</sup>/g and 0.39 cm<sup>3</sup>/g, respectively. The experimental data of kinetic (measured at initial concentrations of 5, 20 and 60 ppm) and isotherm measurements followed the pseudo-second-order kinetic equation and the Freundlich isotherm model, respectively. This study demonstrates that MOF-801 is a promising material for the removal of phosphate from aqueous solutions.