类施氏矿物对工业废水中Cr(Ⅵ)的去除  

Schwertmannite-like Mineral Materials for Removal of Cr(VI)from Industrial Wastewater

作　　者：蓝伊淼 石明岩[1] 林劭楠 安关峰[2] 卢萃云 李妮 林星竹 刘旭 刘嘉宇 LAN Yi-miao;SHI Ming-yan;LIN Shao-nan;AN Guan-feng;LU Cui-yun;LI Ni;LIIN Xing-zhu;LIIU Xu;LIU Jia-yu(College of Civil Engineering,Guangzhou University,Guangzhou 510006,China;Guangzhou Municipal Group Co.Lid.,Guangzhou 510180,China;South China Institute of Environmental Sciences,Ministry of Ecology and Environment,Guangzhou 510655,China;Guangzhou Beikong Environmental Protection Engineering Co.Ltd.,Guangzhou 510000,China)

机构地区：[1]广州大学土木工程学院,广东广州510006 [2]广州市市政集团有限公司,广东广州510180 [3]生态环境部华南环境科学研究所,广东广州510655 [4]广州市北控环保工程有限公司,广东广州510000

出　　处：《中国给水排水》2023年第19期101-108,共8页China Water & Wastewater

基　　金：国家自然科学基金资助项目(21477027);广东省研究生教育创新计划项目;大学生创新创业训练项目(S202311078125、S202311078018);广州市增城区民生科技项目(2020)。

摘　　要：在FeSO_(4)·7H_(2)O、H_(2)O_(2)合成施氏矿物过程中添加Na_(2)SiO_(3)、CaCl_(2)以制备类施氏矿物,用于去除工业废水中的Cr(Ⅵ)。在转速为150 r/min的条件下进行10 min摇瓶试验,分析类施氏矿物去除Cr(Ⅵ)的关键影响因素及其作用机制。结果表明,当共存离子浓度(Na^(+)、Mg^(2+)、K^(+))由20 mmol/L增至100 mmol/L时,Cr(Ⅵ)去除率由95.16%~96.27%降至30.65%~31.35%,共存离子浓度增大对Cr(Ⅵ)的去除存在显著的抑制作用;当络合剂浓度由0.5 mmol/L增至8.0 mmol/L时,Cr(Ⅵ)去除率由97.52%~97.86%降至75.22%~75.33%,络合剂浓度增大会抑制Cr(Ⅵ)的去除。在最佳反应条件下,投加11.12 g/L的FeSO_(4)·7H_(2)O、6.66 g/L的H_(2)O_(2)、8.53 g/L的Na_(2)SiO_(3)、4.44 g/L的CaCl_(2)进行摇瓶试验,对Cr(Ⅵ)的去除率达到97.7%,较施氏矿物提高了49.72%;类施氏矿物在6~8 min内合成完,且在反应1 min内可以将Cr(Ⅵ)基本去除,较施氏矿物的处理时间缩短了约36 h;反应结束后40 d内,类施氏矿物溶液中Cr(Ⅵ)的最高溶出率为1.16%,较施氏矿物降低了27.23%,这是类施氏矿物通过静电吸附、离子交换、共沉淀及网捕等多重途径作用的结果。Schwertmannite-like mineral materials were synthesized by adding Na_(2)SiO_(3) and CaCl_(2)into the reaction between FeSO_(4)·7H_(2)O and H_(2)O_(2),to remove Cr(VI)from industrial wastewater.The key influencing factors and mechanism of Schwertmannite-like mineral materials for Cr(VI)removal were analyzed by shaking bottle test for 10 min at a rotating speed of 150 r/min.When the concentration of the coexisting ions(Na^(+),Mg^(2)and K^(+))increased from 20 mmol/L to 100 mmol/L,the removal rate of Cr(VI)decreased from 95.16%-96.27%to 30.65%-31.35%,and the increase of the coexisting ion concentration had a significant inhibitory effect on the removal of Cr(VI).When the concentration of complexant increased from 0.5 mmol/L to 8.0 mmol/L,the removal rate of Cr(VI)decreased from 97.52%-97.86%to 75.22%-75.33%,and the increasing concentration of complexant inhibited the removal of Cr(VI).Under the optimal reaction conditions,the removal rate of Cr(VI)reached 97.7%in the sharking bottle test with dosages of FeSO_(4)·7H_(2)0(11.12 g/L),H_(2)0_(2)(6.66 g/L),Na,SiO,(8.53 g/L)and CaCl,(4.44 g/L),which was 49.72%higher than that of Schwertmannite.Schwertmannite-like mineral materials were synthesized within 6-8 min,and Cr(VI)was basically removed within 1 min,which was about 36 h shorter than the treatment time of Schwertmannite.Within 40 days after the reaction,the highest dissolution rate of Cr(VI)in the solution of Schwertmannite-like mineral materials was 1.16%,which was 27.23% lower than that of Schwertmannite.This was the result of multiple ways such as electrostatic adsorption,ion exchange,co-precipitation and enmeshment of Schwertmannite-like mineral materials.

关 键 词：类施氏矿物 工业废水 Cr(Ⅵ) 共存离子浓度 共沉淀 

分 类 号：TU992[建筑科学—市政工程]