Ibrahim Shariff, Ang Ha-Ming, Wang Shaobin
Department of Chemical Engineering, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia.
Bioresour Technol. 2009 Dec;100(23):5744-9. doi: 10.1016/j.biortech.2009.06.070. Epub 2009 Jul 21.
Barley straw, an agricultural waste, was chemically modified and evaluated for the removal of emulsified oils from aqueous solution. The chemical modification was performed using NaOH and a cationic surfactant, hexadecylpyridinium chloride monohydrate (CPC). The surface textural and chemical properties of the surfactant modified barley straw (BMBS) were characterized by N(2) adsorption, FT-IR, SEM and water soluble mineral content. The adsorption tests were carried out in batch adsorption system for removal of standard mineral oil (SMO) and canola oil (CO) from water. For both emulsified oils in wastewater, adsorption was found to be strongly related with solution pH. The isotherm study indicated that emulsified oil adsorption on BMBS could be fitted well with the Langmuir model other than Freundlich model. The maximum adsorption capacity for CO and SMO at 25 degrees C determined from the Langmuir isotherm is 613.3 and 584.2 mg g(-1), respectively. Desorption tests in water solution show that oil is strongly bonded with adsorbent and desorption is only about 1-2% in 24 h.
大麦秸秆作为一种农业废弃物，经过化学改性后用于评估其从水溶液中去除乳化油的性能。化学改性采用氢氧化钠和阳离子表面活性剂十六烷基吡啶鎓氯化物一水合物（CPC）进行。通过N₂吸附、傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）和水溶性矿物质含量对表面活性剂改性大麦秸秆（BMBS）的表面结构和化学性质进行了表征。吸附试验在间歇吸附系统中进行，以去除水中的标准矿物油（SMO）和菜籽油（CO）。对于废水中的两种乳化油，发现吸附与溶液pH值密切相关。等温线研究表明，BMBS对乳化油的吸附更符合朗缪尔模型而非弗伦德里希模型。根据朗缪尔等温线确定，25℃时BMBS对CO和SMO的最大吸附容量分别为613.3和584.2 mg g⁻¹。水溶液中的解吸试验表明，油与吸附剂结合紧密，24小时内的解吸率仅约为1-2%。
