One-step Synthesis of Activated Carbon from Molasses and Its Interfacial Adsorption Behavior†

doi:10.7503/cjcu20170221

Abstract

Abstract:

The molasses-based activated carbon(AC) was prepared with Na₂CO₃ as activator by one-step chemical activation method. With the characterization of X-ray diffraction(XRD), scanning electron microscopy(SEM), N₂ adsorption-desorption analysis and elemental analysis, the results showed that the activated carbon is graphitized carbon with specific surface area of 1023 m²/g. The removal capacity of molasses-based activated carbon on Pb(Ⅱ) in solution was studied, the results showed that the adsorption capacity of molasses-based activated carbon was higher than that of commercial activated carbon(CC). With the molasses-based activated carbon as adsorbent, the adsorption time was shorter and the mass of activated carbon were lower than those with commercial activated carbon as adsorbent. The adsorption kinetic fitted better to pesudo-second-order Langumir model, demonstrating a chemical adsorption of monolayer. The molasses-based activated carbon can be recycled and reused for Pb(Ⅱ) adsorption.

Key words: Molasses, Activated carbon, Low-cost, Recycle, Interfacial adsorption

CLC Number:

O613

TrendMD:

GAO Ye, WANG Wei, PANG Liyun, CAO Liyuan, GUO Yupeng, ZHAO Chun. One-step Synthesis of Activated Carbon from Molasses and Its Interfacial Adsorption Behavior^†[J]. Chem. J. Chinese Universities, 2017, 38(12): 2156.

Figures/Tables 9

Fig.1 One-step synthesis of activated carbon from molasses for adsorption of Pb(Ⅱ)

Fig.2 XRD pattern of AC/850/1/4∶1

Fig.3 SEM images of AC/850/1/4∶1(A) and CC(B)

Table 1 Textural characteristics and the specific capacity of AC/850/1/4∶1 and CC*

Sample	S_BET/(m²·g^-1)	V_t/(cm³·g^-1)	V_mic/(cm³·g^-1)	V_mes/(cm³·g^-1)	D_ave/nm	S_mic/(m²·g^-1)	S_ext/(m²·g^-1)
AC/850/1/4∶1	1023	0.49	0.08	0.35	23.8	675	328
CC	544	0.26	0.05	0.07	10.3	345	199

Fig.4 Effects of initial concentration of Pb(Ⅱ)(A), time(B), pH(C), mass of AC(D) and temperature(E) on adsorption of Pb(Ⅱ)

Fig.5 Linear kinetic plots of pseudo-second order model for Pb(Ⅱ) adsorptionPb(Ⅱ) concentration: 70 mg/L; volume of Pb(Ⅱ) solution: 50 mL; mass of AC and CC: 0.1 g; pH=5; contact time: 0~1440 min; temperature: 298 K.

Table 2 Pseudo-second order kinetic model constants for the adsorption of Pb(Ⅱ) onto adsorbents

Adsorbent	q_e,cal/(mg·g^-1)	q_e,exp/(mg·g^-1)	10³ k₂/g·(mg·min)^-1	r²
AC	33.03	34.98	10.00	0.99999
CC	19.15	20.94	2.71	0.99981

Fig.6 ce/qe-ce plots for Pb(Ⅱ) adsorptionPb(Ⅱ) concentration: 25—400 mg/L; volume of Pb(Ⅱ) solution: 50 mL; mass of AC and CC: 0.1 g; pH=5; contact time: 240 min; temperature: 298 K.

Table 3 Langmuir parameters for the adsorption of Pb(Ⅱ) onto adsorbents

Adsorbent	q_m/(mg·g^-1)	k_L/(L·mg^-1)	r²
AC	880.0	0.74	0.9999
CC	480.2	0.43	0.9998

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