| 铝锆改性生物炭对水体低浓度氟的吸附特性 |
| 摘要点击 2839 全文点击 984 投稿时间：2022-05-09 修订日期：2022-06-22 |
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| 中文关键词 生物炭 氟化物 吸附特性 改性 抗生素菌渣 |
| 英文关键词 biochar fluoride adsorption characteristics modification antibiotic residue |
| 作者 | 单位 | E-mail | | 刘艳芳 | 河北科技大学环境科学与工程学院, 石家庄 050018
河北省污染防治生物技术实验室, 石家庄 050018 | lyftry@126.com | | 高玮 | 河北科技大学建筑工程学院, 石家庄 050018 | | | 刘蕊 | 河北科技大学建筑工程学院, 石家庄 050018 | | | 尹思婕 | 河北科技大学环境科学与工程学院, 石家庄 050018
河北省污染防治生物技术实验室, 石家庄 050018 | | | 张妙雨 | 河北科技大学环境科学与工程学院, 石家庄 050018
河北省污染防治生物技术实验室, 石家庄 050018 | | | 刘晓帅 | 河北科技大学环境科学与工程学院, 石家庄 050018
河北省污染防治生物技术实验室, 石家庄 050018 | | | 李再兴 | 河北科技大学环境科学与工程学院, 石家庄 050018
河北省污染防治生物技术实验室, 石家庄 050018 | li_zaixing@163.com |
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| 中文摘要 |
| 针对低浓度含氟水难处理，氟超标排放造成水污染等问题，制备了铝锆改性生物炭（AZBC），研究其对水体低浓度氟离子（F-）的吸附特性及吸附机制.结果表明，AZBC是具有均匀孔隙结构的介孔生物炭，能够快速吸附水体F-，可在20 min内达到吸附平衡.当初始ρ（F-）为10mg ·L-1，AZBC投加量为30 g ·L-1时，F-去除率为90.7%，出水浓度低于1mg ·L-1.AZBC的pHpzc为8.9，推荐pH使用范围为3.2~8.9.其吸附动力学符合拟二级动力学，吸附过程符合Langmuir模型，在25、35和45℃下的最大吸附量分别为8.91、11.40和13.76mg ·g-1.可用1mol ·L-1 NaOH脱附F-，5次循环使用后，AZBC的吸附量下降约15.9%.AZBC的吸附机制为静电吸附和离子交换共同作用.以某工业园区污水厂污水为实验对象，投加量为10 g ·L-1，ρ（F-）可降至1mg ·L-1以下. |
| 英文摘要 |
| To deal with problems such as the difficult treatment of low-concentration fluoride-containing water and water pollution caused by excessive fluoride (F-) discharge, aluminum and zirconium-modified biochar (AZBC) was prepared and its adsorption characteristics and adsorption mechanism for low-concentration fluoride in water were studied. The results showed that AZBC was a mesoporous biochar with uniform pore structure. It could rapidly adsorb F- from water and reach adsorption equilibrium within 20 min. When the initial ρ(F-) was 10 mg·L-1and the AZBC dosage was 30 g·L-1, the removal rate was 90.7%, and the effluent concentration was lower than 1 mg·L-1. The pHpzc of AZBC was 8.9, and the recommended pH in practical application was 3.2-8.9. The adsorption kinetics accorded with pseudo-second order kinetics, and the adsorption process accorded with the Langmuir model. The maximum adsorption capacities at 25, 35, and 45℃ were 8.91, 11.40, and 13.76 mg·g-1, respectively. Fluoride could be desorbed by 1 mol·L-1 NaOH. The adsorption capacity of AZBC decreased by approximately 15.9% after 5 cycles. The adsorption mechanisms of AZBC were the combination of electrostatic adsorption and ion exchange.Taking actual sewage as theexperimental object, when the AZBC dosage was 10 g·L-1, the ρ(F-) was reduced to below 1 mg·L-1. |
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