A new adsorbent of Pb(ii) ions from aqueous solution synthesized by mechanochemical preparation of sulfonated expanded graphite

Abstract

After the mechanochemical modification, sulfonated functional groups were able to be attached on the surface of SEG effectually, acted a significant role in the adsorption process, the schematic diagram of SEG interacted with Pb(ii) showing as below.

Nanoscale zero-valent iron loaded vermiform expanded graphite for the removal of Cr (VI) from aqueous solution

“…Jin et al . confirmed that MnO 2 -loaded EG displayed high removal efficiency on Cr(VI) [27], and in our previous study, sulfonated EG was prepared via mechanochemical treatment to adsorb Pb (II) in aqueous solution [28]. In addition, to achieve a noteworthy enhancement on the stability and mobility of nZVI, a variety of carbonaceous materials, like carboxymethyl cellulose [29], carbon nanotube [30] and tubular nitride carbon [31] were applied as the substrate for better attachment.…”

Synergistic Effect of Expanded Graphite-Silane Functionalized Silica as a Hybrid Additive in Improving the Thermal Conductivity of Cementitious Grouts with Controllable Water Uptake

“…Therefore, chemical composition analysis was carried out by XPS to monitor the changes in the chemical composition on the surface of the hybrid EG additives compared to neat silica and EG. Survey scans of EG, represented in Figure 2a, show two main peaks of C1s and O1s at 286 and 534 eV, respectively, indicating the presence of the carbon and oxygen content [30]. According to the XPS results tabulated in Table 4, EG contains 98% of carbon and 2% of oxygen in its structure, which makes it an excellent candidate for the enhancement of higher thermal conductivity than other carbon-based materials [31].…”

“…The broad XRD peak on the pattern of silica appeared at around 2θ = 21°, belonging to (101) planes, revealing the amorphous structure of the silica [36], and the peak that appeared at around 2θ = 43.6° belongs to the metallic holder. EG shows a sharp peak at around 2θ = 26.5° belonging to the diffraction of (002) planes and a smoother peak at around 2θ = 54.6° belonging to the diffraction of (004) planes, indicating a crystalline structure [30]. As seen in Table 5, after the attachment of the silica particles on the EG surface, the crystallinity degree of EG decreases from 89% down to 70.6% and 68.7% in H-EG-1 and H-EG-2, respectively.…”

Comparison of the characteristic properties of reduced graphene oxides synthesized from natural graphites with different graphitization degrees

“…Only two intense and distinct peaks at around 283.8 and 531.3 eV were observed, which were attributed to the high purity of the graphite, corresponding to the C 1s and O 1s peaks, respectively. 34 Furthermore, the other weak peaks at approximately 151.1 eV could be related to Si 2s caused by a tiny amount of impurity. 35 On the basis of the results obtained via XPS for the surface atomic concentration, the mass ratio of C and O could be obtained and reected the existence of other oxides.…”