弱酸性蓝AS 染料排放的废盐制碳基吸附剂及利用  

Preparation and utilization of carbon-based adsorbent from organic pollutants in waste salt during acidic blue AS dye production

作　　者：张天永[1,2] 张晶怡 姜爽 李彬[1,2] 吕东军 陈都民[4] 陈雪 ZHANG Tianyong;ZHANG Jingyi;JIANG Shuang;LI Bin;LYU Dongjun;CHEN Dumin;CHEN Xue(Tianjin Key Laboratory of Applied Catalysis Science and Technology,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300354,China;Tianjin Engineering Research Center of Functional Fine Chemicals,Tianjin 300354,China;College of Chemistry and Chemical Engineering,Dezhou University,Dezhou 253023,Shandong,China;Yuhong Pigment Co.,Ltd.,Dezhou 253000,Shandong,China)

机构地区：[1]天津大学化工学院,天津市应用催化科学与工程重点实验室,天津300354 [2]天津市功能精细化学品技术工程中心,天津300354 [3]德州学院化学化工学院,山东德州253023 [4]宇虹颜料股份有限公司,山东德州253000

出　　处：《化工学报》2024年第3期890-899,共10页CIESC Journal

基　　金：泰山产业领军人才工程项目(tscx202211094);德州市重大科技创新工程项目。

摘　　要：将染料弱酸性蓝AS(AS)生产排放的含盐废水喷雾干燥后制成废盐,再将其有机污染物煅烧制备成类活性炭吸附剂(LAC),用于AS染料生产过程中产生的洗涤废水的吸附脱色净化,同时回收粗盐NaCl可循环用于AS工业生产的盐析过程。对LAC进行吸附过程动力学、热力学研究,并研究AS染料废水溶液初始浓度、温度及pH对吸附性能的影响。在40 mg/L的AS染料废水中,温度为318 K的条件下,平衡吸附量为29.22 mg/g。在酸性及温度较高时吸附能力较强。Langmuir等温线方程能更好拟合吸附实验结果。另外,采用一锅混合法,添加四水合乙酸镁对LAC进行改性,改性后的吸附剂LACMg0.75比表面积较LAC提升了近5倍,饱和吸附量能够达到550.02 mg/g,较LAC提升了接近20倍。The salt-containing wastewater discharged from the production of the dye weak acid blue AS(AS)is spray-dried to make waste salt,and then the organic pollutants are calcined to prepare a quasi-activated carbon adsorbent(LAC).It was utilized for the adsorption and decolorization of wash wastewater from AS dye production.Additionally,the crude salt(NaCl)recovery from the above calcination technology could be reused in the salting-out process in AS industrial production.This research was conducted to determine the optimal temperature for calcining LAC,and calcination in a muffle furnace at 450℃yielded the best results.Furthermore,the impact of initial dye wastewater concentration,temperature,and pH on the adsorption performance of LAC was investigated.The findings revealed that,in AS dye wastewater with an initial concentration of 40 mg/L,the adsorption at 318 K was more effective than at 298 K and 278 K.At 318 K,the equilibrium adsorption capacity was 29.22 mg/g,and acidic conditions favored the adsorption process.The adsorption kinetics study on LAC indicated that the pseudo-second-order kinetic model better fitted the adsorption results.Thermodynamic analysis revealed that the Langmuir isotherm equation provided a better fit for the adsorption experimental results.Moreover,investigations into the cyclic regeneration performance of LAC demonstrated its good regenerative capabilities,and could be reused several times.Even after four cycles,the adsorption rate for AS dye remained above 80%.Additionally,a modification using a one-pot mixed approach with addition of magnesium acetate tetrahydrate improved the surface area of adsorbent LACMg0.75 by nearly 5 times compared to LAC,achieving a saturation adsorption capacity of 550.02 mg/g,nearly 20 times higher than that of LAC.

关 键 词：弱酸性蓝AS 废水处理 吸附剂 回收 活性炭 以废治废 

分 类 号：TQ09[化学工程] X383[环境科学与工程—环境工程]