| 铁改进型蓝藻生物炭的制备及对地表水中磷的协同吸附机制 |
| 摘要点击 1263 全文点击 407 投稿时间：2022-12-11 修订日期：2023-01-20 |
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| 中文关键词 富营养化 蓝藻生物炭 水蒸气活化 聚合硫酸铁 磷酸盐 |
| 英文关键词 eutrophication blue algae biochar steam activated polymerized ferrous sulfate phosphate |
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| 中文摘要 |
| 为缓解水体富营养化以及蓝藻堆积问题，采用经过聚合硫酸铁（PFS）脱水后的蓝藻制备生物炭吸附水体中的磷酸盐，其中生物炭经过水蒸气活化调节孔隙结构.通过响应面法对蓝藻生物炭的制备条件进行优化.当PFS投加量为458 mg·L-1、碳化温度为433℃和生物炭前体物与水蒸气的质量比为1：11.选取不加PFS生物炭（F0H11-433）与加PFS生物炭（F458H11-43）进行X射线衍射（XRD）、傅里叶红外光谱（FTIR）、Zeta电位和拉曼光谱（Raman）表征，来研究蓝藻生物炭与PFS对磷酸盐的去除是否具有协同效应.结果表明，与F0H11-433相比，F458H11-433表面出现铁氧化物，零电荷点（pHpzc）从4.41提高到6.19，生物炭的无序、缺陷程度得到提高.准二级动力学模型和Langmuir模型适用于描述F458H11-433的吸附除磷过程，饱和吸附容量为31.97 mg·g-1.F458H11-433对实际湖水具有优良的除磷性能，出水磷酸盐残余量低于0.025 mg·L-1；在几种常见阴离子共存的情况下，仍然表现出了优异的选择性吸附；5次循环后F458H11-433对磷酸盐的去除仍能达到75.78%，表明F458H11-433具有可再生的特性.结合吸附前后材料的表征结果，F458H11-433的除磷机制主要涉及静电吸引和配体交换. |
| 英文摘要 |
| To alleviate the problems of eutrophication and blue algae accumulation in water, biochar was prepared from blue algae dehydrated using polymerized ferrous sulfate(PFS) to absorb phosphate in water, and the biochar was activated using steam to adjust the pore structure. The preparation conditions of blue algae biochar were optimized using the response surface method. The optimal results were as follows:the dosage of PFS was 458 mg·L-1, the carbonization temperature was 433℃, and the mass ratio of biochar precursor to steam was 1:11. Biochar without PFS(F0H11-433) and biochar with PFS(F458H11-433) were characterized using X-ray diffraction(XRD), Fourier-transform infrared spectroscopy(FTIR), zeta potential, and Raman spectra(Raman) were used to study whether blue algae biochar and PFS had a synergic effect on phosphate removal. The results showed that:compared with F0H11-433, iron oxide appeared on the surface, the zero point of charge(pHpzc) increased from 4.41 to 6.19, and the disorder and defect degree of biochar was increased in F458H11-433. The pseudo-second-order model and Langmuir model were suitable for describing the adsorption process of F458H11-433, and the saturated adsorption capacity was 31.97 mg·g-1. F458H11-433 had excellent phosphorus removal efficiency in actual lake water, and the residual phosphate content of effluent was less than 0.025 mg·L-1. In the presence of several common anions, it still showed excellent selective adsorption. After five cycles, the phosphate removal of F458H11-433 still reached 75.78%, indicating that F458H11-433 had the characteristic of being renewable. Combined with the material characterization results before and after adsorption, the phosphorus removal mechanism of F458H11-433 mainly involved electrostatic attraction and ligand exchange. |
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