Effects of High Temperature and Freeze-thaw Cycle Ageing on Adsorption Performance of Hydrochar and Biochar on Pollutants

doi:10.19657/j.geoscience.1000-8527.2021.04.04

Abstract

Abstract:

The application of hydrochar or biochar derived from agricultural wastes into soil amendments and remediation is one of hot topics nowadays. Due to long-term varied natural condition, such as changed ambient temperature, the properties of hydrochar or biochar would change and have some effect on the adsorption capacities. Hence, it is an important issue to assess the adsorption performance of hydrochar and biochar under the effect of ageing. In the study, high temperature ageing and freeze-thaw cycle ageing were used to simulate the changed ambient temperature. The physicochemical properties of fresh and aged rice husk and corn straw derived biochars and hydrochars were compared by multi-techniques of elemental analysis, Fourier infrared spectrometer (FTIR) and scanning electron microscope (SEM). The adsorption capacity and stability of hydrochar and biochar, as well as the effects of different ageing time (e.g., 30, 60, 90 cycles) on their adsorption capacity, were compared by batch experiments. The results showed that biochar had good adsorption stability for Cd (II) and atrazine, while hydrochar had poor adsorption stability for atrazine. The two ageing processes increased the oxygen containing functional groups of hydrochar and biochar, thus enhancing the adsorption capacity of Cd (II) and atrazine. In high temperature and freeze-thaw environment, biochar was more susceptible to environmental effects than hydrochar as the ageing time increased. The obtained results from this study suggest us to consider the rational use of hydrochar and biochar in the environmental remediation.

Key words: biochar, hydrochar, ageing, pollutant, adsorption ability

CLC Number:

X142

GUAN Junjie, LIU Yuyan, LIU Siyuan, CHEN Jiawei. Effects of High Temperature and Freeze-thaw Cycle Ageing on Adsorption Performance of Hydrochar and Biochar on Pollutants[J]. Geoscience, 2021, 35(04): 931-939.

Figures/Tables 8

References 27

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水热炭	灰分^*/ %	元素组分^**/%				原子比^**
水热炭	灰分^*/ %	C	H	O	N	H/C	O/C	(O+N) /C
RH	16.23	51.37	6.72	41.06	0.60	1.570	0.600	0.610
HRH30	15.38	49.02	6.37	44.01	0.44	1.560	0.673	0.681
HRH60	16.46	49.31	6.25	43.96	0.40	1.522	0.669	0.676
HRH90	15.43	49.90	6.38	43.20	0.46	1.534	0.649	0.657
FRH30	15.68	50.70	6.50	42.18	0.51	1.539	0.624	0.633
FRH60	16.06	50.13	6.48	42.90	0.42	1.551	0.642	0.649
FRH90	15.64	49.03	6.42	44.11	0.38	1.571	0.675	0.682
CS	7.66	52.38	6.68	39.27	1.59	1.530	0.562	0.588
HCS30	7.05	52.38	6.73	39.07	1.75	1.541	0.559	0.588
HCS60	6.88	51.45	6.76	40.25	1.49	1.578	0.587	0.611
HCS90	6.67	51.17	6.63	40.74	1.40	1.554	0.597	0.621
FCS30	5.96	51.01	6.70	40.77	1.46	1.575	0.599	0.624
FCS60	7.15	51.71	6.51	40.05	1.69	1.510	0.581	0.609
FCS90	6.38	51.44	6.66	40.29	1.54	1.554	0.587	0.613

水热炭	灰分^*/ %	元素组分^**/%				原子比^**
水热炭	灰分^*/ %	C	H	O	N	H/C	O/C	(O+N) /C
RH	16.23	51.37	6.72	41.06	0.60	1.570	0.600	0.610
HRH30	15.38	49.02	6.37	44.01	0.44	1.560	0.673	0.681
HRH60	16.46	49.31	6.25	43.96	0.40	1.522	0.669	0.676
HRH90	15.43	49.90	6.38	43.20	0.46	1.534	0.649	0.657
FRH30	15.68	50.70	6.50	42.18	0.51	1.539	0.624	0.633
FRH60	16.06	50.13	6.48	42.90	0.42	1.551	0.642	0.649
FRH90	15.64	49.03	6.42	44.11	0.38	1.571	0.675	0.682
CS	7.66	52.38	6.68	39.27	1.59	1.530	0.562	0.588
HCS30	7.05	52.38	6.73	39.07	1.75	1.541	0.559	0.588
HCS60	6.88	51.45	6.76	40.25	1.49	1.578	0.587	0.611
HCS90	6.67	51.17	6.63	40.74	1.40	1.554	0.597	0.621
FCS30	5.96	51.01	6.70	40.77	1.46	1.575	0.599	0.624
FCS60	7.15	51.71	6.51	40.05	1.69	1.510	0.581	0.609
FCS90	6.38	51.44	6.66	40.29	1.54	1.554	0.587	0.613

水热炭	准一级动力学方程				准二级动力学方程
水热炭	q_e	k₁	R²		q_e		k₁		R²
BC	29.553	0.304	0.946	31.345		0.011		0.999
BR	1.126	0.412	0.678	1.597		0.176		0.997
CS	2.570	0.077	0.914	2.686		0.041		0.980
RH	2.072	0.054	—	2.128		0.069		0.992

水热炭	准一级动力学方程				准二级动力学方程
水热炭	q_e	k₁	R²		q_e		k₁		R²
BC	29.553	0.304	0.946	31.345		0.011		0.999
BR	1.126	0.412	0.678	1.597		0.176		0.997
CS	2.570	0.077	0.914	2.686		0.041		0.980
RH	2.072	0.054	—	2.128		0.069		0.992

水热炭	准一级动力学方程			准二级动力学方程
水热炭	q_e	k₁	R²	q_e	k₁	R²
BC	8.453	0.0339	0.970	8.977	0.010	0.990
BR	0.755	0.0269	0.160	0.771	0.140	0.977
CS	1.063	0.335	0.991	1.268	0.198	0.997
RH	1.333	1.387	0.899	1.449	0.260	0.998