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污染控制技术及原理

Sorption behavior of copper ion and malachite green on phosphoric acid esterified soybean hull

基金项目：中国博士后科学基金(No20060390960);安徽省重要生物保护与利用重点实验室开放基金;安徽省高校生物环境与生态安全省级重点实验室开放基金;安徽师范大学生物大分子进化实验室开放基金

摘要：报道了一种功能基为磷酸羟基的酯化豆壳阳离子吸附剂的固相制备技术,研究了铜离子和孔雀绿在改性豆壳上的吸附行为.采用静态批次试验研究了不同实验参数(pH值、吸附剂用量、吸附质浓度和吸附时间)对铜和染料吸附的影响.铜离子和孔雀绿分别在pH≥3.0和6.0时达到最大吸附值.对于浓度为100mg·L^-1的铜溶液,5.0g·L^-1及以上的改性豆壳能去除91%以上的铜;改性豆壳用量≥2.0g·L^-1时,能去除浓度为250mg·L^-1的溶液中95%以上的孔雀绿.改性豆壳对铜离子和孔雀绿的吸附符合Langmuir吸附等温线模型,最大吸附能力分别为31.55mg·g^-1和178.57mg·g^-1.对铜离子和孔雀绿的吸附分别在75min和7h达到吸附平衡,准一级反应动力学方程和准二级反应动力学方程能分别描述铜离子和孔雀绿在改性豆壳上的吸附过程.

Abstract：The solid phase preparation of a cationic sorbent, which bears hydroxyphosphates derived from esterified soybean hull, is reported. The sorption behaviors of Cu (II) and malachite green (MG) from aqueous solution onto modified soybean hull (MSH) were investigated in a batch system. The removal experiments were performed under various conditions such as different initial pH, MSHdosage, sorbate concentration and contact time. The maximum removal of Cu (II) and MGwas obtained at initial solution pH≥3.0 and pH≥6.0, respectively. For 100 mg·L^-1 of Cu solution, a removal ratio above 91% could be achieved by 5.0 g·L^-1 or more of MSH. Above 95% of a 250 mg·L^-1 MGdye solution could be removed by 2.0 g·L^-1 or more of MSH. The sorption isotherms of both Cu (II) and MGfit the Langmuir model. The maximum removal capacity (Q_m) of MSHwas 31.55 mg·g^-1 for Cu (II) and and 178.57 mg·g^-1 for MG. The sorption equilibrium of Cu (II) was reached within 75min and could be described by the pseudo-first-order kinetic model, while MGreached equilibrium after 7 h and fit pseudo-second-order kinetics.