Olu-Owolabi Bamidele I, Alabi Alimoh H, Diagboya Paul N, Unuabonah Emmanuel I, Düring Rolf-Alexander
Department of Chemistry, University of Ibadan, Ibadan, Nigeria.
Landmark University, Omu-Aran, Kwara State, Nigeria.
J Environ Manage. 2017 May 1;192:94-99. doi: 10.1016/j.jenvman.2017.01.055. Epub 2017 Jan 31.
Synergistically combined low-cost composites may be effective for the potential treatment of effluents containing organic pollutants. Hence, preparation of Carica-papaya-modified-kaolinite (CPK) and pine-cone-modified-kaolinite (PCK) composites via calcination of pure kaolinite (KAC), Carica-papaya and pine-cone seeds is demonstrated. The composites' specific surface areas were reduced by more than 57% but no structural modification in KAC lattice d-spacing, indicating impregnation of calcined biomass on clay surfaces and pores. However, composites' cation exchange capacities were enhanced over 4-fold, indicating higher potential for adsorption. Adsorption of 2,4,6-trichlorophenol on composites and KAC showed that CPK and PCK attained equilibrium relatively faster (30 min) compared to KAC (60 min). Modeling studies showed that 2,4,6-trichlorophenol removal mechanisms involved electrostatic interactions on sites of similar energy. Modification enhanced adsorption by 52 and 250% in PCK and CPK, respectively, and adsorption increased with temperature.
协同组合的低成本复合材料可能对含有机污染物废水的潜在处理有效。因此，展示了通过煅烧纯高岭土（KAC）、番木瓜和松果种子来制备番木瓜改性高岭土（CPK）和松果改性高岭土（PCK）复合材料。复合材料的比表面积降低了57%以上，但KAC晶格d间距没有结构改性，表明煅烧生物质浸渍在粘土表面和孔隙中。然而，复合材料的阳离子交换容量提高了4倍以上，表明具有更高的吸附潜力。2,4,6 - 三氯苯酚在复合材料和KAC上的吸附表明，与KAC（60分钟）相比，CPK和PCK达到平衡的速度相对较快（30分钟）。建模研究表明，2,4,6 - 三氯苯酚的去除机制涉及在能量相似位点上的静电相互作用。改性分别使PCK和CPK的吸附增强了52%和250%，且吸附随温度升高而增加。
