Activated Carbon and Graphitic Carbon Nitride Immobilized on Mesoporous Silica for Adsorption of Nitrobenzene

Abstract

Adsorption of nitrobenzene (NB) from aqueous solution onto mesoporous silica materials, i.e., pyrolyzed MCM-41 (Si–C), pyrolyzed Al-MCM-41 (Al–C), MCM-41 containing g-C3N4 (Si–C3), and Al-MCM-41 containing g-C3N4 (Al–C3) were investigated. Results indicated that NB adsorption was fast, and the adsorption process reached a steady state in under 5 min. The adsorption data were tested by Langmuir, Freundlich, and Redlich–Peterson isotherm models, and the Langmuir isotherm was found to provide a better fit with the experimental data. The maximum adsorption capacities of various sorbents Al–C, Si–C, Al–C3, and Si–C3 were 243.9 mg/g, (1982 μmol/g), 217.4 mg/g (1767 μmol/g), 116.3 mg/g (945.1 μmol/g), and 54.95 mg/g (446.5 μmol/g), respectively.

Removal of Phosphates in Aqueous Solution by Adsorption on Calcium Oxide

“…The adsorption isotherms of three models were studied to understand the phenomenon of removal of phosphate ions on calcium oxide. The Langmuir equation can be written in the linearized form [19,20]:…”

“…The Temkin isotherm was used in the following form: [18,19] The parameter values of the Freundlich, Langmuir, and Temkin models are summarized in Table 1.…”

Binding and optical characteristics of polycyclic aromatic hydrocarbons and their nitroderivatives adsorbed on the C3N monolayer

“…The porous carbon nitride frameworks like C 2 N and C 3 N 4 have been observed to be suitable materials for wastewater treatment. 3,[23][24][25][26] Graphitic carbon nitride based adsorbents are found to be better and cost effective than activated carbon. The Al@C 2 N ML is demonstrated to be suitable as an adsorbent for enrichment and utilization of various volatile organic compounds.…”

“…25 Activated carbon and C 3 N 4 immobilized on mesoporous silica were found to be interesting for the adsorption of nitrobenzene. 26 After the successful synthesis of the C 3 N ML, 27,28 it has attracted the attention of many researchers. Many theoretical research studies have been focused on two-dimensional materials for use in gas sensing.…”

Preparation of a Novel Cellulose–Styrene Copolymer Adsorbent and Its Adsorption of Nitrobenzene from Aqueous Solutions

“…So, it is urgent to treat the NB wastewater. Methods are available for treating NB wastewater mainly including photocatalytic degradation [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ], ozonation biodegradation [ 14 , 15 , 16 , 17 , 18 ], and adsorption [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ]. Adsorption is the most common treatment for removing NB from wastewater, and activated carbon is the dominating adsorbent material.…”