2.昆山市污水处理有限公司, 昆山 215300
1.School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
2.Kunshan Sewage Treatment Co. Ltd., Kunshan 215300, China
为改性剂,通过热解制备了改性菖蒲生物炭(MBC),探究热解温度、改性剂浓度、添加量、溶液初始pH和共存离子对生物炭吸附磷的影响,并通过SEM-EDS、FT-IR、XRD和元素组成等手段对生物炭进行表征。结果表明,相较于未改性的菖蒲生物炭(BC),MBC对磷的吸附效果明显增强,在热解温度为673 K、改性剂浓度为1.0 mol·L
,其对磷酸盐的吸附行为良好符合准二级动力学模型,且Langmuir等温吸附模型能更准确的描述MBC对磷酸盐的吸附特征。MBC对污水水质pH具有较宽的适应范围并对磷酸根离子具有较强的选择吸附性。
In order to realize the resource utilization of the wetland plant(calamus), calamus biochar (MBC) was prepared with FeSO
modifier by pyrolysis of NaOH pretreated calamus. The effects of pyrolysis temperature, modifier concentration, additive amount, initial solution pH and coexisting ions on phosphorus adsorption by biochar were investigated. Biochar was characterized by SEM-EDS, FT-IR, XRD and elemental composition analysis. The results showed that, compared with unmodified calamus biochar (BC), the adsorption effect of phosphorus on MBC was significantly enhanced. the MBC prepared at pyrolysis temperature of 673 K and 1.0 mol·L
modifier concentration had the best phosphorus removal effect, the removal rate and equilibrium adsorption capacity were 98.48% and 24.62 mg·g
, respectively. After modification, the hydrophilicity and polarity of biochar materials increased, and the total specific surface area, specific surface area and micropore volume increased significantly. Iron oxides were successfully loaded on the surface of the material, which mainly existed in the form of Fe
crystals. The optimal dosage of MBC was 0.2 g·L
, and the adsorption behavior of MBC was in good agreement with the pseudo-second order model. Langmuir isothermal adsorption model could more accurately describe the phosphate adsorption characteristics on MBC. MBC had a wide range of pH adaptability and strong selective adsorption to phosphate anions.
.
Effect of pyrolysis temperature on the phosphorus adsorption and removal performance by biochar
Effect of modifier concentration on phosphorus adsorption and removal by MBC
SEM image of biochar material(25 000倍)
EDS spectra of biochar material
FT-IR spectra of biochar before and after modification
XRD patterns of MBC before and after phosphorus adsorption
MBC对磷酸盐吸附动力学模型和颗粒内扩散模型拟合
Kinetic model of phosphate adsorption by MBC and the fitting of intra-particle diffusion model
改性生物炭Langmuir和Freundlich吸附等温模型拟合
Fitting of Langmuir and Freundlich isotherm adsorption models for modified biochar
Effect of solution pH on the adsorption and removal of phosphorus by MBC
Effect of coexisting ions on the adsorption and removal of phosphorus by MBC
Fitting parameters of intraparticle diffusion model for phosphorus adsorption on MBC
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