改性柚子皮吸附剂对模拟废水中pb2+的吸附性能

以废柚子皮为原料,经ZnCl2浸泡-加热的化学改性手段制备改性柚子皮生物吸附剂,并通过模拟试验研究该吸附剂对废水中pb2+的去除.考察了模拟废水的pH、吸附时间、吸附剂用量和pb2+初始浓度、温度等因素对柚子皮吸附剂去除pb2+的影响,并研究柚子皮吸附剂对pb2+的吸附动力学及吸附特征.结果表明,模拟废水的pH、吸附时间、吸附剂用量和pb2+初始浓度、温度等因素对柚子皮吸附剂吸附废水中pb2+均有显著影响.适宜的吸附条件为pH5.3～6.5,吸附时间1.5h,吸附剂用量10g· L-1,pb2初始质量浓度100 mg·L-1,温度30℃.在该条件下,废水中pb2+去除率在90％以上.柚子皮吸附剂对废水中pb2+的吸附符合动力学二级反应方程,等温吸附规律可用Langmuir、Freundlich和Temkin模型进行较好的描述.

Adsorbent Prepared From Waste Pomelo Peel and Its Adsorption of Pb2+ in Wastewater

A kind of adsorbent prepared from pomelo peels using the zinc chloride activating method was used in laboratory to test its capability of removing Pb2+ from wastewater and to study effects of pH of the wastewater,duration of exposure,dosage of the adsorbent,initial concentration of Pb2+ in wastewater,and temperature on the capability,and kinetics and laws of the adsorption as well.Results show that the effects of these factors enumerated above were significant.The optimal conditions for the adsorption were found to be 5.3-6.5 in initial pH of the wastewater,1.5 h in duration of exposure,10 g·L-1 in dosage of the adsorbent,100 mg·L-1 in initial Pb2+ concentration of the wastewater,and 30 ℃ in temperature.Under the circumstance,the adsorbent could remove more than 90% of the Pb2+ from the wastewater.Its Pb2+ adsorption kinetics tallied with the second-order reaction equation and its adsorption isotherm could well be described with the Langmuir,Freundlich and Temkin models.