Phenol removal from aqueous solution using silica and activated carbon derived from rice husk

Abstract

Phenol and its derivatives are organic pollutants with dangerous effects, such as poisoning, carcinogenicity, mutagenicity, and teratogenicity in humans and other organisms. In this study, the removal of phenol from aqueous solution by adsorption on silica and activated carbon of rice husk was investigated. In this regard, the effects of initial concentration of phenol, pH, dosage of the adsorbents, and contact time on the adsorption of phenol were investigated. The results showed that the maximum removal of phenol by rice husk silica (RHS) and rice husk activated carbon (RHAC) in the initial concentration of 1 mgL−1 phenol, 2 gL−1 adsorbent mass, 120 min contact time, and pH 5 (RHS) or pH 6 (RHAC) were obtained up to 91% and 97.88%, respectively. A significant correlation was also detected between increasing contact times and phenol removal for both adsorbents (p < 0.01). The adsorption process for both of the adsorbents was also more compatible with the Langmuir isotherm. The results of this study showed that RHS and RHAC can be considered as natural and inexpensive adsorbents for water treatment.

Adsorption of phenol over bio-based silica/calcium carbonate (CS-SiO2/CaCO3) nanocomposite synthesized from waste eggshells and rice husks

“…The CS-SiO 2 /CaCO 3 nanocomposite shows removal efficiency of 84% after 60 min and 89% at 90 min of contact time. The result agrees with findings reported by Asgharnia et al (2019) and Sarker & Fakhruddin (2017) using RH as an adsorbent.…”

“…Giraldo & Moreno-Piraján (2014) observed similar findings over activated carbons derived from eggshell particles. Asgharnia et al (2019) also reported a better matching of phenol adsorption with the Langmuir isotherm model using RHS and RHAC as adsorbents.…”

“…The presence of available exchangeable ions (Kashi, 2017), multiple adsorption sites on the adsorbent at this pH range leads to the observed removal efficiency in the CS-SiO 2 /CaCO 3 nanocomposite compared to the other adsorbents. Asgharnia et al (2019), while investigating the effect of pH on phenol removal efficiency, observed higher efficiency for rice husk activated carbon (RHAC) at pH 6 and rice husk carbon (RHC) at pH 5. The result further agrees with the findings reported by Kashi (2017) and Daraei et al (2013) using powdered eggshell.…”

Improved phenol sequestration from aqueous solution using silver nanoparticle modified Palm Kernel Shell Activated Carbon

“…(2013) Rice husk AC 95.0% Ashanendu et al. (2019) Rice husk AC 97.8% Asgharnia et al. (2018) Magnetic palm kernel biochar 93.4% Hairuddin et al.…”

Studies on the Removal of Phenol and Nitrophenols from Water by Activated Carbon Developed from Demineralized Kraft Lignin

“…Amidst these, adsorption employing different adsorbents such as clay [9], zeolites [10], metal organic frameworks [11], biomass [12], and activated carbon [8] have been used successfully by researchers. Adsorption is recognized as a versatile technique owing to its simplistic design and convenient operating technique [13][14][15][16] with activated carbons as the extensively utilized materials for the removal of phenol and its derivatives [8,17]. However, to understand the process better for the removal of molecules, the study of adsorbate-adsorbent interactions and the effect of groups is also necessary.…”