Biomass waste is recognized as potential raw material for many adsorbents. In this study orange peel biochar (OP) was modified with amidoxime group. The consequent amidoximated orange peel biochar (OP-AO) was investigated to reveal potential for the removal of U(VI) from aqueous solution. Essential parameters for the adsorption such as pH, initial U(VI) concentration, adsorption time and temperature were determined. The SEM, FT-IR, XPS, BET analyses and Zeta potential test were used to characterize the structure of amidoximated biochar and the adsorption mechanisms. Kinetics, isotherms and thermodynamics were studied. The results showed that modification with amidoxime group improved the U(VI) adsorption capacity of the original biochar (Qmax (OP-AO) = 382.89 mg/g > Qmax (OP) = 155.44 mg/g). The obtained results showed that the used biochar is a promising adsorbent for the specific uranium separation.

中文翻译：

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胺肟化橙皮作为特定的铀清除剂

生物质废物被认为是许多吸附剂的潜在原材料。在本研究中，橙皮生物炭 (OP) 被胺肟基团修饰。研究了由此产生的胺肟化橙皮生物炭 (OP-AO)，以揭示从水溶液中去除 U(VI) 的潜力。确定了吸附的基本参数，如 pH、初始 U(VI) 浓度、吸附时间和温度。SEM、FT-IR、XPS、BET分析和Zeta电位测试被用来表征酰胺肟化生物炭的结构和吸附机制。研究了动力学、等温线和热力学。结果表明，胺肟基改性提高了原始生物炭对U(VI)的吸附能力(Qmax (OP-AO) = 382.89 mg/g > Qmax (OP) = 155.44 mg/g)。