Adsorption Characteristics of Chlorophenols from Aqueous Solution onto Graphene

Abstract

The adsorption of chlorophenols (CPs) on pristine graphene was investigated. The adsorption capacities of graphene were 88.1 mg g–1 for 2-chlorophenol (2-CP), 114.2 mg g–1 for 4-chlorophenol (4-CP), 155.3 mg g–1 for 2,4-dichlorophenol (DCP), and 175.8 mg g–1 for 2,4,6-trichlorophenol (TCP), respectively. The equilibrium was attained during 20 min. There was no significant effect on the adsorption amounts in the pH range of pH 1.01–8.09 for 2-CP, 1.08–8.01 for 4-CP, 1.04–7.03 for DCP, and 2.86–5.63 for TCP. The Langmuir and pseudo-second-order models supplied good fitting of the experimental data. Thermodynamic constants demonstrated that the process was endothermic and spontaneous.

Efficient Removal of 2,4-DCP by Nano Zero-Valent Iron-Reduced Graphene Oxide: Statistical Modeling and Process Optimization Using RSM-BBD Approach

“…The plot of 2,4-DCP removal affected by NZVI-rGO dosage and initial pH (Figure 7(c)) indicates that the removal rate decreases with the increase of pH value, which is opposite to the trend of dosage. This phenomenon may be due to the inhibition of π-π interaction and cationic-π bond between 2,4-DCP and rGO with the increase of pH value, which leads to the decrease of adsorption capacity at a higher pH value [43]. And the two factors have an evident effect on the 2,4-DCP removal being consistent with the larger F value shown in Table 3.…”

Concerted catalytic and photocatalytic degradation of organic pollutants over CuS/g-C3N4 catalysts under light and dark conditions

“…Sewage purification, especially the removal of organic molecular pollutants including dyes, pesticides, and plasticizers, has gained considerable attention owing to its great importance for ecological and human health [1] . To date, various methods, including adsorption [2] , [3] , [4] , filtration [5] , biodegradation [6] , chemical catalysis [7] and photocatalysis [8] , [9] , have been successfully developed for the removal of these organic pollutants. Among these methods, photocatalytic degradation has emerged as one of the most promising technologies because it is typically inexpensive and environmentally friendly, readily uses solar light, and does not generate secondary pollutants [8] , [9] , [10] .…”

Polydopamine decorated carbon dots nanocomposite as an effective adsorbent for phenolic compounds

“…Phenolic compounds, particularly chlorophenol and cyanophenol are highly toxic, carcinogenic effects, mutagenic and estrogenic. Due to their unpleasant fragrance and low biodegradability under aerobic and anaerobic conditions, [1][2][3] it is essential to remove them from wastewaters. 4,5 The treatment of industrial phenolic wastes based on chemical, physical, and biological treatments 6,7 is one of the important tasks in wastewater purification.…”