Guangxi Key Laboratory of Subtropical Bioresource Conservation and Utilization, Guangxi University, Nanning, Guangxi 530005, PR China.
J Hazard Mater. 2010 Jul 15;179(1-3):266-75. doi: 10.1016/j.jhazmat.2010.03.001. Epub 2010 Mar 4.
To develop low cost metal adsorbents with less secondary pollution, metal adsorption from the aqueous solutions by the raw os sepiae (ROS) and alkali (NaOH)-pretreated OS (APOS) of the cuttlefish (Sepiella maindroni Rochebrune) was characterized. The capacities of adsorption of ROS and APOS were estimated to be 299.26 mg Cu g(-1) and 299.58 mg Cu g(-1), respectively. Metal adsorption by OS was significantly improved by appropriately increasing initial pH in the solution but hardly affected by temperature change within a wide range of 15-45 degrees C. Cu adsorption of both ROS and APOS was well described neither by Langmuir model nor by Freundlich model. Metal adsorption by OS fell in the order of Fe > Cu approximately = Cd > Zn in the solution with mixed metals, but followed the sequence of Cd > Cu > Fe approximately = Zn in the solutions respectively, with a single metal of Fe, Cu, Cd and Zn. The changes in Ca amounts in OS and solutions in adsorption strongly correlated with removal efficiencies of the metals. Obvious shifts of stretching bands of numbers of groups in OS after and before adsorption and the pretreatment occurred. It was concluded: (1) that metal adsorption by OS involves ion exchange, which occurred mainly between Ca rather than K and Na that OS itself contains and metals that were added in the solution, (2) that metal adsorption-promoting effects by NaOH pretreatment likely involve deprotonation of surface groups in OS, exposure of more functional groups, and increase in specific surface areas and (3) that related mechanisms for adsorption also likely include surface complexation, electrostatic adsorption and even micro-deposition. The results also indicated that OS is a very promising absorbent for metal removal from electroplating wastewater.
为了开发低成本、二次污染小的金属吸附剂，利用墨鱼（Sepiella maindroni Rochebrune）的原始乌贼骨（ROS）和经碱（NaOH）预处理的乌贼骨（APOS）从水溶液中吸附金属。分别估计 ROS 和 APOS 的吸附容量为 299.26 和 299.58mg Cu/g。通过适当提高溶液中的初始 pH 值，OS 的金属吸附能力显著提高，但在 15-45°C 的较宽温度范围内变化对其影响不大。ROS 和 APOS 的 Cu 吸附均不符合 Langmuir 模型和 Freundlich 模型。在混合金属溶液中，OS 对金属的吸附顺序为 Fe>Cu≈Cd>Zn，但在分别含有单一金属 Fe、Cu、Cd 和 Zn 的溶液中，其顺序为 Cd>Cu>Fe≈Zn。OS 中 Ca 量的变化与金属的去除效率密切相关。吸附前后 OS 和溶液中 Ca 量的明显变化与金属的去除效率密切相关。吸附前后 OS 中许多基团的伸缩带发生了明显的位移，且在预处理后发生了位移。结论是：（1）OS 对金属的吸附涉及离子交换，主要发生在 OS 本身所含的 Ca 与 K 和 Na 之间，以及溶液中添加的金属之间；（2）NaOH 预处理对金属吸附的促进作用可能涉及 OS 表面基团的去质子化、更多功能基团的暴露以及比表面积的增加；（3）吸附的相关机制还可能包括表面络合、静电吸附甚至微沉积。结果还表明，OS 是一种很有前途的从电镀废水中去除金属的吸附剂。
