研究以改性海泡石作為吸附劑從酸性溶液中回收Pd（Ⅱ）的吸附特性和機(jī)理;通過等溫模型、動(dòng)力學(xué)和熱力學(xué)模型分析改性海泡石對(duì)Pd（Ⅱ）的吸附特性;利用SEM-EDS、TEM和XPS技術(shù)研究改性海泡石對(duì)Pd（Ⅱ）的吸附機(jī)理。Langmuir模型表明,當(dāng)溫度為30°C時(shí),改性海泡石對(duì)Pd（Ⅱ）的最大吸附量為322.58 mg/g。動(dòng)力學(xué)實(shí)驗(yàn)結(jié)果表明,準(zhǔn)二級(jí)動(dòng)力學(xué)模型能較好地模擬改性海泡石對(duì)Pd（Ⅱ）的吸附過程,化學(xué)吸附為改性海泡石吸附Pd（Ⅱ）的控速步驟。當(dāng)Pd（Ⅱ）的初始濃度為100 mg/L時(shí),1 g/L改性海泡石可吸附99%的Pd（Ⅱ）。吸附-脫附循環(huán)實(shí)驗(yàn)結(jié)果表明,改性海泡石具有良好的穩(wěn)定性和重復(fù)使用性。本研究結(jié)果表明,改性海泡石是一種可高效且經(jīng)濟(jì)的Pd（Ⅱ）回收材料。 

【文章來源】：Transactions of Nonferrous Metals Society of China. 2020,30(05)EISCICSCD

【文章頁數(shù)】：12 頁

【文章目錄】：
1 Introduction
2 Experimental
    2.1 Materials
    2.2 Batch adsorption experiments
    2.3 Desorption and reusability
    2.4 Analytical methods
3 Results and discussion
    3.1 Characterization of adsorbent
    3.2 Effect of pH on adsorption of Pd(II)by modified sepiolite
    3.3 Adsorption behavior of modified Pd(II)and sepiolite
        3.3.1 Adsorption isotherms
        3.3.2 Adsorption kinetics and thermodynamics
    3.4 Desorption and reusability
    3.5 Adsorption mechanism for Pd(II)by modified sepiolite
        3.5.1 SEM-EDS images and EDS spectra
        3.5.2 TEM images
        3.5.3 XPS spertra
4 Conclusions



本文編號(hào)：3513988