灵芝菌糠对三种典型染料的吸附动力学研究

论文总字数：16176字

摘 要

灵芝是世界上最受欢迎的药用食用菌之一，在世界范围内得到了广泛的栽培。灵芝菌糠(SSGL)是灵芝培养过程中的废渣，然而，目前还没有一种经济有效的技术来利用灵芝菌糠(SSGL)。本研究首次将SSGL作为一种新型生物吸附剂，对三种染料孔雀石绿、藏红T和亚甲基蓝进行吸附，并研究其吸附动力学。初始pH、染料浓度、温度和时间对染料在SSGL上的吸附有一定程度的影响。Langmuir和Freundlich等温吸附模型与吸附数据吻合较好，SSGL对孔雀石绿的最大吸附量为40.65mg/g。基于吸附热力学模型，发现SSGL对染料的吸附是一个降焓和熵为负的放热过程。SSGL能在5min内快速吸附染料，并对染料的吸附动力学进行了分析，SSGL与二级动力学模型有很好的一致性。本研究可为SSGL的资源化利用提供一定的理论与技术支持。

关键词：生物吸附；灵芝菌糠；等温线；热力学；动力学

Abstract:Ganoderma lucidum is one of the most popular edible fungi in the world. Ganoderma lucidum waste substrate (SSGL) is the waste residue of Ganoderma lucidum culture. However, there is no economical and effective technology to utilize Ganoderma lucidum waste substrate. In this study, SSGL was used as a new biological adsorbent for the first time. Three dye malachite green, red T and methylene blue were adsorbed by biosorption method, and the adsorption thermodynamics and kinetics of their aqueous solution were studied. Initial pH, dye concentration, temperature and time affected the adsorption of dyes onto SSGL to a certain extent. Langmuir and Freundlich isotherm models fit well with the adsorption data, and the maximum adsorption capacity of SSGL for malachite green was 40.65 mg/g. Adsorption of the dyes onto SSGL was a spontaneous exothermic process of decreased enthalpy and entropy based on adsorption thermodynamics model. SSGL could adsorb the dyes rapidly in five minutes and adsorption kinetic analysis of the dyes onto SSGL showed a good alignment with second-order kinetics model. Generally speaking, SSGL should be a new economic and efficient biological adsorbent for the removal of malachite green, Tibet red T and methylene blue from aqueous solution, and can be used in the design of SSGL as a full-scale biological adsorbent. According to the conditions obtained in this study, adsorption thermodynamics and kinetics model, in wastewater treatment plant, SSGL is used as a biological adsorbent for filtration, which can be used for wastewater treatment in a sewage treatment plant. Remove dyes from polluted water.

Keywords： bio-adsorption; spent mushroom substrate; isotherms; thermodynamics; kinetics

目 录

1. 前言 2

1.1 染料的概述 2

1.2染料废水的处理方法 2

1.3菌糠的概况和主要成分 2

1.4研究思路 3

2. 材料与方法 4

2.1实验仪器 4

2.2实验材料 4

2.3实验方法 5

2.3.1 pH对生物吸附的影响 5

2.3.2吸附等温线研究 5

2.3.3热力学研究 5

2.3.4动力学研究 5

2.3.5染料浓度的测定 6

3.结果与分析.................................................................................................................................7

3.1 pH值对染料吸附效果的影响 7

3.2染料初始浓度对吸附等温线的影响及吸附等温线的评价 7

3.3吸附热力学与热力学系数的评价 11

3.4吸附动力学及动力学系数的计算 13

4.结论与展望 17

4.1结论.........................................................................................................................................................16

4.2展望.........................................................................................................................................................16

5.致谢 ...........17

参考文献 18

1. 前言

1.1 染料的概述

染料广泛应用于食品、医药、印染、化妆品等行业^[1]。据统计，工业用染料种类超过10万种，世界年产量约8000万~9000万吨。这些年，随着染料的迅速发展和广泛的应用，约有10%~15%的染料被释放到环境中，从而造成染料废水的污染问题。因此，染料是水污染的主要来源之一。更严重的是，许多染料都有毒性^[2]，能致癌^[3]和有诱导有机体突变的影响^[4]。释放到环境中的染料对人类和动物的健康构成极大的威胁^[5]。

剩余内容已隐藏，请支付后下载全文，论文总字数：16176字