海洋铁锰结核对次甲基蓝的氧化性脱色  

OXIDATIVE DECOLORIZATION OF METHYLENE BLUE USING MARINE Fe-Mn NODULES

作　　者：王征[1] 朱茂旭[1] 周良勇[2] 

机构地区：[1]海洋化学理论与技术教育部重点实验室中国海洋大学,山东青岛266100 [2]中国地质调查局青岛海洋地质研究所,山东青岛266071

出　　处：《矿物学报》2007年第2期131-136,共6页Acta Mineralogica Sinica

基　　金：国家自然科学基金(批准号:49904005);土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所)开放基金(055111)

摘　　要：利用锰氧化物具有高的吸附与氧化还原化学活性的特点，研究了采自东太平洋的铁锰结核对阳离子染料次甲基蓝氧化性脱色特征。结果表明，铁锰结核表面的非均相氧化是次甲基蓝脱色的主要机制。在通常的染料废水浓度范围内，铁锰结核可有效地对次甲基蓝染料废水氧化脱色。随染料浓度降低，铁锰结核投放量增加和粒度减小，次甲基蓝的脱色率明显提高。次甲基蓝的矿化程度（TOC去除率）较高，但仍低于脱色率。pH对次甲基蓝脱色的影响主要体现在对表面配位体形成和对体系还原电位的影响，当pH〈4.0时，脱色率随酸度的增加明显提高；当pH在4.0~10.0时，溶液pH值对脱色率影响有限。在铁锰结核连续循环体系中，溶解Mn2＋浓度和pH的增加是脱色率不断下降的主要原因。Manganese oxides are powerful oxidizers as well as scavengers for many inorganic and organic compounds. Fe-Mn nodules collected from the East Pacific Ocean were used for decolorization of a cationic dye methylene blue （MB） in a batch system, The results showed that heterogeneous oxidations on the surfaces of Fe-Mn nodules were the main mechanism for MB decolorization. In typical concentration range of dye wastewaters, the Fe-Mn nodules can be used as an effective material for MB wastewater treatment. Both efficiency of MB decolorization and TOC removal were enhanced rapidly with increasing loading and decreasing particle size of the nodules, and decreasing MB concentration. A high degree of MB mineralization could be obtained at an optimal condition, but usually lower than that of MB decolorization, pH exerted effects on MB decolorization by influencing both the formation of surface complex and redox potential of the system. When pH〈4.0, MB decolorization increased with a decrease in pH, while pH at the range 4.0-10.0 exerted limited effect on MB decolorization. In a consecutive reuse system, Mn^2＋ accumulation from reductive dissolution of Mn oxides, and pH increase due to H^＋ consumption are probably two important factors causing a decrease in MB decolorization with time.

关 键 词：次甲基蓝 铁锰结核 脱色 降解 吸附 

分 类 号：P579[天文地球—矿物学] P744.3[天文地球—地质学]