Enhanced Adsorption, Photocatalytic Degradation Efficiency of Phenol Red Using CuZnAl Hydrotalcite Synthesized by Co-Precipitation Technique

Abstract

ZnAlCO3 hydrotalcite materials modified by Cu2+ ions were synthesized by the co-precipitation method according to the molar ratios of (Cu2+ + Zn2+):Al3+ as 7:3. Thus, the modified materials contain various molar ratios of Cu2+ from 0–3.5 in the samples. The synthesized materials were characterized by X-ray diffraction pattern (XRD), FT–IR, EDS, SEM, the N2 adsorption/desorption isotherm (BET), and UV–Vis DRS spectrum. The synthesized materials were characterized by a layered double hydroxide structure—such as hydrotalcite. The specific surface area BET increases slightly, corresponding to the increasing Cu2+ molar ratios, and the bandgap energy Eg decreases accordingly. Especially, these material samples have a high phenol red (PR) adsorption capacity at a concentration of 100 ppm and PR was degraded under a 30 W LED light with over 90% of conversion efficiency in the presence of 1.2 mL of 30% H2O2 solution. In addition, the CuH–3.5 material sample maintained stability after four times catalytic reuse. Therefore, this material can be used as an effective treatment for the wastewater of the sedge mat weaving village.

Differential removal of tetracycline hydrochloride and quinolone antibiotics by calcined and uncalcined layered double hydroxides

“…The crystal plane spacings of d 1 = 7.6200 nm and d 2 = 3.8100 nm correspond to (003) and (006) of LDH as in Figure 2C (JCPDS 48-1021), which also indicates that LDH was successfully prepared. Some lamellar structures are still observed in the TEM images of LDO [Figure 2B] due to "the memory effect" under the influence of ethanol during TEM measurement [27] . In Figure 2D, d 3A], but LDO loses its lamellar structure and instead appears as a collapsed state with many micropores [Figure 3B].…”