Adsorption mechanism of hexavalent chromium with activated carbon of Prunus mira shell

doi:10.11894/iwt.2019-1082

Abstract

Abstract:

Activated carbon(ZCAC) was prepared by using Prunus mira shell as raw material with zinc chloride chemical activation method. The prepared ZCAC was characterized by SEM, FT-IR, nitrogen adsorption-desorption, Zeta potential, etc., and its adsorption effect and adsorption mechanism for Cr(Ⅵ) in water were investigated. The results showed that the specific surface area of the prepared ZCAC was 1 460.0 m²/g, the total pore volume was 0.733 cm³/g, the average pore diameter was 2.59 nm, and the isoelectric point was 4.4. The maximum adsorption capacity of ZCAC for Cr(Ⅵ) was 128.65 mg/g, and its adsorption for Cr(Ⅵ) was a monolayer, chemical, endothermic and spontaneous reaction.

Key words: Prunus mira shell, activated carbon, Cr(Ⅵ), adsorption

摘要：

以光核桃核壳为原料，采用氯化锌化学活化法制备了活性炭（ZCAC）。利用SEM、FT-IR、氮气吸附-脱附、Zeta电位等对制备的ZCAC进行了表征，并考察了其对水中Cr（Ⅵ）的吸附效果及吸附机理。结果表明，制备的ZCAC的比表面积为1 460.0 m²/g，总孔容为0.733 cm³/g，平均孔径为2.59 nm，等电点为4.4。ZCAC对Cr（Ⅵ）的最大吸附量为128.65 mg/g，其对Cr（Ⅵ）的吸附为单层、化学、吸热、自发的反应。

关键词: 光核桃核壳, 活性炭, Cr（Ⅵ）, 吸附

CLC Number:

X505

Jintao Kan,Chuanben Liu,Jingyang Wang,Chaoqi Zhang,Lei Yuan,Zhengchang Zhong. Adsorption mechanism of hexavalent chromium with activated carbon of Prunus mira shell[J]. Industrial Water Treatment, 2020, 40(10): 76-80.

阚金涛,刘传犇,王敬阳,张超奇,袁雷,钟政昌. 光核桃核壳活性炭对Cr（Ⅵ）的吸附机理探究[J]. 工业水处理, 2020, 40(10): 76-80.

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URL: https://www.iwt.cn/EN/10.11894/iwt.2019-1082

https://www.iwt.cn/EN/Y2020/V40/I10/76

Figures/Tables 11

References 14

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样品	S_BET/（m²·g^-1）	S_mic/（m²·g^-1）	S_ext/（m²·g^-1）	V_tot/（cm³·g^-1）	V_mic/（cm³·g^-1）	V_ext/（cm³·g^-1）	平均孔径/nm	产率/%
ZCAC	1 460.0	890.6	569.4	0.733	0.364	0.369	2.59	40.89

样品	S_BET/（m²·g^-1）	S_mic/（m²·g^-1）	S_ext/（m²·g^-1）	V_tot/（cm³·g^-1）	V_mic/（cm³·g^-1）	V_ext/（cm³·g^-1）	平均孔径/nm	产率/%
ZCAC	1 460.0	890.6	569.4	0.733	0.364	0.369	2.59	40.89

模型	参数	298.15 K	308.15 K	318.15 K
Langmuir模型	q_m（cal）/（mg·g^-1）	112.2	119.78	125.42
	K_L/（L·mg^-1）	0.121	0.162	0.169
	R_L	0.073	0.051	0.046
	R²	0.989	0.977	0.959
Freundlich模型	K_F	35.854	42.829	45.631
	n_F	4.804	5.239	5.291
	R²	0.882	0.893	0.917

模型	参数	298.15 K	308.15 K	318.15 K
Langmuir模型	q_m（cal）/（mg·g^-1）	112.2	119.78	125.42
	K_L/（L·mg^-1）	0.121	0.162	0.169
	R_L	0.073	0.051	0.046
	R²	0.989	0.977	0.959
Freundlich模型	K_F	35.854	42.829	45.631
	n_F	4.804	5.239	5.291
	R²	0.882	0.893	0.917

模型	参数	298.15 K	308.15 K	318.15 K
伪一级动力学模型	q_cal/（mg·g^-1）	96.42	104.09	107.85
	K₁/min^-1	0.165 5	0.164 3	0.171 9
	R²	0.906	0.917	0.904
伪二级动力学模型	q_cal/（mg·g^-1）	102.51	110.66	114.49
	K₂/（g·mg^-1·min^-1）	2.65×10^-3	2.44×10^-3	2.46×10^-3
	R²	0.992	0.991	0.995

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