Abstract:Biochar can be formed by many processes in nature and affect the migration and transformation of pollutants in environment. In order to compare the adsorption performance of biochar formed under laboratory and natural conditions, two types of Cunninghamia lanceolata biochar were prepared in a muffle furnace at 700 ℃ and open environment, respectively, which were marked as BC1 and BC2. The structures and properties of these two types of biochar were characterized by nitrogen adsorption (BET), scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FTIR). The adsorption behaviors of chosen neonicotinoid insecticides (acetamiprid (ACE), clothianidin (CLO)) on biochar were studied, and the effects of initial pH, temperature and coexisting ions on the adsorption behaviors were also investigated. The results showed that the adsorption capacity of BC1 was much greater than BC2, the maximum adsorption capacities of BC1 toward ACE and CLO were 24.46 mg·g?1 and 31.56 mg·g?1, respectively, while the maximum adsorption capacities of BC2 toward ACE and CLO were 11.13 mg·g?1 and 12.24 mg·g?1, respectively. The adsorption kinetics of ACE and CLO on BC1 and BC2 fitted well with the pseudo-second order adsorption model. The intraparticle diffusion model analysis indicated that a more significant three-stage process occurred for BC1 adsorption than BC2 adsorption. The fitting results of Langmuir and Freundlich model showed that the adsorption of two insecticides on BC1 belonged to a single molecular layer adsorption, and on BC2 belonged to both single and multi-molecular layer adsorptions. The thermodynamics experiments indicated that the adsorption processes of neonicotinoid insecticides on BC1 and BC2 were Spontaneous endothermic ones. With the increase of initial pH and ionic strength, the adsorption ability of biochar was inhibited. The inhibitory effect of Na+ was lower than that of Ca2+ at the same concentration. The results can provide a reference for the removal of neonicotinoid insecticides in water. Key words:biochar/ acetamiprid/ clothianidin/ adsorption.
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1.Jiangsu Key Laboratory of Environmental Science and Engineering, School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China 2.Hangzhou Kangliwei Environmental Technology Co. Ltd., Hangzhou 310011, China Received Date: 2020-01-02 Accepted Date: 2020-03-01 Available Online: 2020-12-08 Keywords:biochar/ acetamiprid/ clothianidin/ adsorption Abstract:Biochar can be formed by many processes in nature and affect the migration and transformation of pollutants in environment. In order to compare the adsorption performance of biochar formed under laboratory and natural conditions, two types of Cunninghamia lanceolata biochar were prepared in a muffle furnace at 700 ℃ and open environment, respectively, which were marked as BC1 and BC2. The structures and properties of these two types of biochar were characterized by nitrogen adsorption (BET), scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FTIR). The adsorption behaviors of chosen neonicotinoid insecticides (acetamiprid (ACE), clothianidin (CLO)) on biochar were studied, and the effects of initial pH, temperature and coexisting ions on the adsorption behaviors were also investigated. The results showed that the adsorption capacity of BC1 was much greater than BC2, the maximum adsorption capacities of BC1 toward ACE and CLO were 24.46 mg·g?1 and 31.56 mg·g?1, respectively, while the maximum adsorption capacities of BC2 toward ACE and CLO were 11.13 mg·g?1 and 12.24 mg·g?1, respectively. The adsorption kinetics of ACE and CLO on BC1 and BC2 fitted well with the pseudo-second order adsorption model. The intraparticle diffusion model analysis indicated that a more significant three-stage process occurred for BC1 adsorption than BC2 adsorption. The fitting results of Langmuir and Freundlich model showed that the adsorption of two insecticides on BC1 belonged to a single molecular layer adsorption, and on BC2 belonged to both single and multi-molecular layer adsorptions. The thermodynamics experiments indicated that the adsorption processes of neonicotinoid insecticides on BC1 and BC2 were Spontaneous endothermic ones. With the increase of initial pH and ionic strength, the adsorption ability of biochar was inhibited. The inhibitory effect of Na+ was lower than that of Ca2+ at the same concentration. The results can provide a reference for the removal of neonicotinoid insecticides in water.
高效液相色谱仪(e2695，美国Waters)，超纯水装置(Millipore Integral 3，美国Milli-Q)，组合式恒温摇床(ZQZY-BF8，上海知楚)，马弗炉(SX2-8-10N/NP，上海一恒)，型材切割机(355切割机，浙江欧莱德)，pH计(FE28，瑞士Mettler Toledo)。
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