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载镧生物炭的优化制备及其对水体中砷的吸附 (To optimize the preparation and carrying lanthanum biochar adsorption of arsenic in water)

Title载镧生物炭的优化制备及其对水体中砷的吸附 (To optimize the preparation and carrying lanthanum biochar adsorption of arsenic in water)
Publication TypeMiscellaneous
Year of Publication2015
AuthorsFéngyànfáng, Lihong Xue, Bèi Yáng, Haijun Sun, Shiying He, and Zhang Yang Lin
Abstract

以玉米秸秆为原材料优化制备用于吸附水体中五价砷的载镧生物炭(La-biochar),对其表面进行了系统表征,同时考察了环境条件对载镧生物炭吸附性能的影响.结果表明:相比负载前生物炭,负载后生物炭表面更粗糙,比表面积增大4.6倍,同时表面成功负载有大量镧元素.以获取对五价砷的最大吸附能力为目的,通过响应面模型获得La-biochar的优化制备条件为:物料比w(La)/w(秸秆)=9.47%,停留时间=20min,热解温度=300oC.中性和酸性环境条件有利于La-biochar对砷酸根的吸附,而碱性条件则有不利影响;较高浓度的CO32-显著降低其对砷酸根吸附,而同样浓度的Cl-和F-不会造成明显影响. (Corn straw as raw material for the adsorption of water to optimize the preparation of pentavalent arsenic contained biochar lanthanum (La-biochar), its surface characterization of the system, also investigated the impact of environmental conditions on the carrying of La biochar adsorption properties. Results show: compared to the previous load biochar, biochar after load surface rougher than the surface area is increased by 4.6 times, while the surface is loaded with a lot of success lanthanum element to obtain the maximum adsorption capacity of the pentavalent arsenic for the purpose by the response surface models. get La-biochar production conditions optimized: material ratio w (La) / w (straw) = 9.47%, the residence time = 20min, pyrolysis temperature = 300oC neutral and acidic environmental conditions favor the La-biochar for arsenate. adsorption, and the basic conditions are adversely affected; higher concentrations of CO32- significantly reduce the adsorption of arsenate, and the same concentration of Cl- and F- will not cause significant impact.)

URLhttp://www.cnki.com.cn/Article/CJFDTotal-ZGHJ201508028.htm