Table 1

Adsorbents	Moisture content (%)	Surface area (cm^²)
RH	2.3	94.8

Table 1: Characterization result of RH

Table 2

Adsorption	Isotherm	RH
Langmuir	q_{_m}(mg/g)	66.5
	K_{_L}(l/mg)	1.29
	R_{_L}(l/mg)	0.96
	R_₂	0.9872
Freundlich	n_{_F}	0.69
	K_f(l/mg)	239.56
	R^²	0.9811
Temkin	B_{_T}	43.682
	A_{_T}(l/g)	8.620
	R^²	0.9165

Table 2: Linear equilibrium isotherm parameters for phenols adsorption onto adsorbent

Table 3

Adsorption kinetics		RH
Pseudo-first order	K_₁ (min^{^-1})	0.081
	R^²	0.9231
Pseudo second order	K_₂ (L/mg.min)	0.0569
	R^²	0.9805
Elovich	α (mg/g.min)	0.4584
	β (g/mg)	0.0688
	R^²	0.9421

Table 3: Linear kinetic parameters for phenol adsorption onto adsorbents

Table 4

Adsorbent	Temperature	ΔG (KJ/mol)	ΔH (KJ/mol)	ΔS (J/mol)
RH	298	-1 2.73
	308	-1 3.70
	313	-1 4.74	-37.98	-82.52
	323	-1 0.43
	333	-1 0.76

Table 4: Thermodynamic parameter for phenol adsorption

Tables at a glance

Table 1

Table 2

Table 3

Table 4

Figures at a glance

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

FIGURE 1

Plate 1: SEM of RH before adsorption

FIGURE 2

Plate 2: SEM of RH after adsorption

FIGURE 3

Figure 1: FTIR spectra of RH before adsorption

FIGURE 4

Figure 2: FTIR spectra of RH after adsorption

FIGURE 5

Figure 3: Influence of Adsorbent (RH) Dosage and Contact Time

FIGURE 6

Figure 4: Influence of Effluent Temperature on RH

FIGURE 7

Figure 5: Influence of effluent pH on phenol uptake by RH

FIGURE 8

Figure 6: Influence of effluent concentration on phenol uptake by RH

FIGURE 9

Figure 7: Linear pseudo first order kinetic plot

FIGURE 10

Figure 8: Linear pseudo second order kinetic plot

FIGURE 11

Figure 9: Linear Elovich Kinetic Plot

FIGURE 12

Figure 10: Van’t Hoff plot for the adsorption of Phenols