| MgO改性莲蓬壳生物炭的制备及其磷吸附特性 |
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| 引用本文： | 王盛华,朱丹晨,邵敬爱,向家涛,杨海平,易娟,张世红,陈汉平.MgO改性莲蓬壳生物炭的制备及其磷吸附特性[J].环境科学,2019,40(11):4987-4995. |
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| 作者姓名： | 王盛华 朱丹晨 邵敬爱 向家涛 杨海平 易娟 张世红 陈汉平 |
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| 作者单位： | 华中科技大学能源与动力工程学院煤燃烧国家重点实验室,武汉,430074;华中科技大学能源与动力工程学院煤燃烧国家重点实验室,武汉430074;华中科技大学能源与动力工程学院新能源科学与工程系,武汉430074;深圳市水务(集团)有限公司,深圳,518031 |
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| 基金项目： | 国家自然科学基金项目（51576088，51876077） |
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| 摘 要： | 为了研究生物炭作为磷吸附剂的潜在应用特性,本文通过将MgO与莲蓬壳混合物快速热解制备纳米MgO-生物炭吸附剂.采用XRD、BET、SEM和TEM对其理化特性进行表征,并进行了吸附实验.结果表明,MgO主要以薄片状和颗粒状的形态负载在炭表面,使吸附活性位点增加,MgO-生物炭MBC3吸附量是未负载MgO生物炭MBC1的14倍,热解通10%CO_2载气,MBC9的吸附量进一步增加为MBC1的16倍.准二级动力学能更好地描述吸附过程,磷酸根在MgO-生物炭上的吸附是以化学吸附为主导.MBC3和MBC9的Langmuir最大吸附量分别可达到283. 26 mg·g~(-1)和297. 96 mg·g~(-1). MgO-生物炭是一种高效的磷吸附剂,可用来治理水体富营养化问题.
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| 关 键 词： | 莲蓬壳 MgO改性 磷酸根 吸附动力学 等温吸附 |
| 收稿时间： | 2019/3/16 0:00:00 |
| 修稿时间： | 2019/5/23 0:00:00 |
Preparation of MgO Modified Lotus Shell Biochar and Its Phosphorus Adsorption Characteristics |
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| WANG Sheng-hu,ZHU Dan-chen,SHAO Jing-ai,XIANG Jia-tao,YANG Hai-ping,YI Juan,ZHANG Shi-hong and CHEN Han-ping.Preparation of MgO Modified Lotus Shell Biochar and Its Phosphorus Adsorption Characteristics[J].Chinese Journal of Environmental Science,2019,40(11):4987-4995. |
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| Authors: | WANG Sheng-hu ZHU Dan-chen SHAO Jing-ai XIANG Jia-tao YANG Hai-ping YI Juan ZHANG Shi-hong and CHEN Han-ping |
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| Institution: | State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China,State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China,State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;Department of New Energy Science and Engineering, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China,State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China,State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;Department of New Energy Science and Engineering, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China,Shenzhen Water Group Co., Ltd., Shenzhen 518031, China,State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China and State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;Department of New Energy Science and Engineering, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China |
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| Abstract: | To study the potential application characteristics of biochar as a phosphate adsorbent, nano-MgO-biochar was prepared by rapid pyrolysis of a mixture of MgO and lotus shells. The physicochemical properties were characterized by XRD, BET, SEM, and TEM, and adsorption experiments were conducted. The results showed that MgO was mainly supported on the surface of carbon in the form of flakes and granules, which increased the adsorption active site, and the adsorption amount of MgO-biochar MBC3 was 14 times higher than that of biochar MBC1 without MgO. The adsorption capacity of MBC9, which was prepared by rapid pyrolysis under 10% CO2 atmosphere, was further increased 16 times higher than that of MBC1. The adsorption kinetics followed a pseudo-second-order model, which indicated the adsorption of phosphate on MgO-biochar was dominated by chemical adsorption. According to the Langmuir equation, the maximum adsorption capacity of MBC3 and MBC9 could reach 283.26 mg·g-1 and 297.96 mg·g-1, respectively. MgO-biochar is a high-efficiency phosphate adsorbent, which can be used to control the eutrophication of water. |
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| Keywords: | lotus shell MgO modification phosphate adsorption kinetics isothermal adsorption |
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