Alexandru Ioan Cuza University, Department of Chemistry, Iaşi, România.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2011;46(12):1366-75. doi: 10.1080/10934529.2011.606701.
The potential of ammonium lignosulfonate (ALS) decolorization and degradation in aqueous solution was studied in a heterogeneous system using hydrogen peroxide and a Cu (II)-chelating ion exchanger. This was based on acrylic copolymers functionalized with N,N dimethylamino propylamine (DMAPA) as a catalyst. In order to optimize the efficiency of the system, the influence of such process parameters like H(2)O(2) concentration, pH, contact time, temperature, ALS concentration and catalyst amount were evaluated. The apparent rate constant of decolorization calculated from the absorbance data indicates that the process profiles follow pseudo-first order kinetics. Lignosulfonate degradation was furthermore studied by FTIR spectroscopy, thermogravimetric analysis and determination in phenolic compounds. The catalyst stability and reusability have also been investigated. Our experimental results clearly indicate that, under optimum conditions, the ammonium lignosulfonate solutions exhibit a total bleaching associated with degradation and significant mineralization to CO(2).
采用过氧化氢和 Cu（II）螯合离子交换剂在非均相体系中研究了木质素磺酸钠（ALS）的脱色和降解潜力。该方法基于用 N，N-二甲基氨基丙胺（DMAPA）功能化的丙烯共聚物作为催化剂。为了优化系统效率，评估了诸如 H（2）O（2）浓度，pH，接触时间，温度，ALS 浓度和催化剂用量等工艺参数的影响。从吸光度数据计算的表观脱色速率常数表明，该过程曲线遵循准一级动力学。通过傅里叶变换红外光谱，热重分析和酚类化合物的测定进一步研究了木质素磺酸盐的降解。还研究了催化剂的稳定性和可重复使用性。我们的实验结果清楚地表明，在最佳条件下，铵木质素磺酸盐溶液表现出总脱色与降解和显著矿化到 CO（2）相关联。
