Removal of Cr(VI) from Aqueous Solutions Using Amino‐Functionalized Carbon Nanospheres Adsorbents

Abstract

Carbon nanospheres were prepared and functionalized with carboxyl acid groups (CNS-CA), then reacted with 3-aminopropyltriethoxysilane to introduce amino groups onto the surface (CNS-NH 2 ) by post-synthesis grafting. CNS-NH 2 was acidified in order to convert the amino groups (-NH 2 ) into ammonium moieties (ÀNH þ 3 ). Various techniques such as N 2 physisorption, X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, thermogravimetry, X-ray photoelectron spectroscopy, and transmission electron microscopy were used to characterize the nanospheres. The removal of chromium ions from aqueous solution using CNS-NH þ 3 was investigated. Factors influencing the uptake of Cr(VI) ions such as solution pH, adsorbent dose, and initial Cr(VI) ion concentration were investigated. Equilibrium adsorption data fitted the Langmuir model very well. The adsorption maximum capacity of Cr(VI) was found to be 52.38 mg/g. The reusability of CNS-NH þ 3 results indicated that it can be reused five times successfully without loss of adsorption capacity. Water Environ. Res., 90, 1925Res., 90, (2018.

Fabrication of Biomass-Derived N, S Co-doped Carbon with Hierarchically Porous Architecture for High Performance Supercapacitor

“…The two broad di®raction peaks at 23 and 43 correspond to (002) di®raction of amorphous carbon and (100) di®raction of graphitized carbon, respectively. 35,36 Additionally, Raman spectra were carried to further con¯rm the structure of as-prepared samples as shown in Fig. 3(b), in which the observed two distinctive peaks at about 1380 cm À1 and 1660 cm À1 are attributed to the D band (the disorder or defects in the graphite structure) and the G band (the graphitic order), respectively.…”