化工进展
化工進展
화공진전
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
2014年
7期
1925-1931
,共7页
董光霞%齐金秋%潘新革%李晓晨
董光霞%齊金鞦%潘新革%李曉晨
동광하%제금추%반신혁%리효신
荔枝皮%孔雀绿%吸附%水溶液%模型
荔枝皮%孔雀綠%吸附%水溶液%模型
려지피%공작록%흡부%수용액%모형
litchi pericarps%Malachite Green%adsorption%aqueous solution%model
采用Box-Behnken响应曲面优化设计对荔枝皮吸附去除水中染料孔雀绿（MG）的影响因素（如吸附时间、吸附剂用量、pH值）进行研究，建立了去除率和上述因素之间的二次多项式模型，得到荔枝皮吸附孔雀绿的最佳吸附条件为：温度25℃、吸附时间122.31min、吸附剂用量2.81g/L、pH=6.75、MG浓度为100mg/L，最优条件下荔枝皮对孔雀绿的吸附去除率可以达99.75%。用Langmuir和Freundlich方程对吸附等温线进行拟合，其中Langmuir 方程拟合效果最好，其最大吸附量为142.86mg/g，且吸附过程符合假二次动力学模型。此外，热力学结果表明，荔枝皮对孔雀绿的吸附属于自发的吸热过程。结合吸附-解吸循环实验和对吸附的 FT-IR 表征，表明荔枝皮是一种极具潜力的高效的吸附剂，能有效去除水中的孔雀绿离子。
採用Box-Behnken響應麯麵優化設計對荔枝皮吸附去除水中染料孔雀綠（MG）的影響因素（如吸附時間、吸附劑用量、pH值）進行研究，建立瞭去除率和上述因素之間的二次多項式模型，得到荔枝皮吸附孔雀綠的最佳吸附條件為：溫度25℃、吸附時間122.31min、吸附劑用量2.81g/L、pH=6.75、MG濃度為100mg/L，最優條件下荔枝皮對孔雀綠的吸附去除率可以達99.75%。用Langmuir和Freundlich方程對吸附等溫線進行擬閤，其中Langmuir 方程擬閤效果最好，其最大吸附量為142.86mg/g，且吸附過程符閤假二次動力學模型。此外，熱力學結果錶明，荔枝皮對孔雀綠的吸附屬于自髮的吸熱過程。結閤吸附-解吸循環實驗和對吸附的 FT-IR 錶徵，錶明荔枝皮是一種極具潛力的高效的吸附劑，能有效去除水中的孔雀綠離子。
채용Box-Behnken향응곡면우화설계대려지피흡부거제수중염료공작록（MG）적영향인소（여흡부시간、흡부제용량、pH치）진행연구，건립료거제솔화상술인소지간적이차다항식모형，득도려지피흡부공작록적최가흡부조건위：온도25℃、흡부시간122.31min、흡부제용량2.81g/L、pH=6.75、MG농도위100mg/L，최우조건하려지피대공작록적흡부거제솔가이체99.75%。용Langmuir화Freundlich방정대흡부등온선진행의합，기중Langmuir 방정의합효과최호，기최대흡부량위142.86mg/g，차흡부과정부합가이차동역학모형。차외，열역학결과표명，려지피대공작록적흡부속우자발적흡열과정。결합흡부-해흡순배실험화대흡부적 FT-IR 표정，표명려지피시일충겁구잠력적고효적흡부제，능유효거제수중적공작록리자。
The effect of several important parameters on the removal of Malachite Green by litchi pericarps was evaluated using an optimal experimental design based on Box-Behnken Response Surface methodology. The factors included contact time,adsorbent dosage and pH. A quadratic model for predicting the optimum removal conditions was derived,and the obtained optimal parameters were at the temperature of 25℃,contact time of 122.31min,adsorbent dosage of 2.81g/L,pH value of 6.75, MG initial dye concentration 100mg/L. At the optimal conditions,the maximal removal rate of MG reached 99.75%. Langmuir and Freundlich equations were applied to fit the adsorption equilibrium data. The Langmuir isotherm adsoroption model was found to fit the data best and maximum adsorption capacity of MG was 142.86mg/g,and adsorption kinetics conforms to pseudo-second-order model. Additionally,result of thermodynamics measurement suggested that the adsorption processes is spontaneous and endothermic. Finally,the adsorption-desorption cycle and FT-IR were also studied, suggesting the litchi pericarp is a promising and efficient adsorbent for removing MG from water.
