發(fā)布時間：2018-07-13 15:07

【摘要】：染料廢水和環(huán)境內(nèi)分泌干擾物質(zhì)具有毒害性大、難降解等特點,是當前環(huán)境問題的焦點,對生態(tài)環(huán)境和人類健康造成極大的影響。海泡石作為一種廉價的粘土礦物吸附劑,已廣泛應用于廢水處理,但親水性使其在有機廢水處理中受限。本論文利用CTAB(十六烷基三甲基溴化銨)改性海泡石對剛果紅和雙酚A進行吸附研究,對目前受染料廢水和環(huán)境內(nèi)分泌干擾物質(zhì)污染的水體治理具有十分重要的意義。(1)利用CTAB對海泡石原土進行有機改性、再進一步熱活化處理,制得CTAB用量為0.3~1.0倍海泡石陽離子交換容量(0.3~1.0CEC)的系列改性海泡石(記為H-XCEC-S,其中X表示CTAB用量為海泡石陽離子交換容量的倍數(shù),H和S分別代表活化處理和海泡石原土),制備條件為:改性時間24 h,改性溫度為30℃,熱活化溫度為120℃、熱活化時間為2 h。其中,H-0.5CEC-S對剛果紅吸附性能最佳,H-0.8CEC-S對雙酚A的吸附性能最佳。(2)H-0.5CEC-S對剛果紅的最佳吸附條件為:M=1 g/L,p H=7,t=120 min,H-0.5CEC-S和S對剛果紅的飽和吸附量分別為649.98 mg/g、88.50 mg/g。二級動力學數(shù)學模型和Langmuir等溫吸附模型能夠更好的描述H-0.5CEC-S對剛果紅的吸附,在溫度為288K、298K、308K條件下進行擬合,理論飽和吸附量分別為578.03 mg/g、675.67 mg/g、740.74 mg/g,熱力學參數(shù)分析ΔG0,ΔH0,ΔS0,H-0.5CEC-S對剛果紅的吸附行為是自發(fā)的吸熱過程。(3)H-0.8CEC-S對雙酚A的最佳吸附條件為:M=1 g/L,p H=10,t=240 min,H-0.8C-S和S對雙酚A的飽和吸附量分別為46.31mg/g、16.79 mg/g。H-0.8CEC-S對雙酚A的吸附動力學符合準二級動力學數(shù)學模型,吸附熱力學符合Langmuir等溫吸附模型,在溫度為291K、301K、311K條件下進行擬合,理論飽和吸附量分別為52.08 mg/g、46.62 mg/g、40.58 mg/g,熱力學參數(shù)分析ΔG0,ΔH0,ΔS0,H-0.8CEC-S對雙酚A的吸附行為是自發(fā)的放熱過程。(4)經(jīng)SEM、p I、BET、TG/DSC、XRD表征分析,CTAB改性海泡石表面變得光滑,形態(tài)松散,疏水性增強;H-0.5CEC-S、H-0.8CEC-S的等電點分別由改性前的8.72增大到8.97和9.08,比表面積由25.44 m~2/g分別減小到12.35 m~2/g和8.96 m~2/g;海泡石改性前后的層間距d_((110))=12.07 nm均保持不變,表明CTAB沒有插入海泡石層間,只是覆蓋在海泡石外表面和孔道內(nèi)表面,因此吸附作用主要發(fā)生在海泡石表面;經(jīng)吸附前后FT-IR、XPS表征分析,H-0.5CEC-S對剛果紅的吸附和H-0.8CEC-S對雙酚A的吸附存在配位作用,π-π堆積和離子交換作用。綜合表征分析結果,H-0.5CEC-S對剛果紅的吸附作用主要為-SO_3~-基團與H-0.5CEC-S表面靜電引力作用和Br~-的離子的交換作用、-SO_3~ 和-N=N-基團的氫鍵作用。H-0.8CEC-S對雙酚A的吸附作用主要為Br~-的離子交換作用、還有BPA~-、HBPA~(2-)與H-0.8CEC-S表面靜電引力作用、-OH基團的氫鍵作用。
[Abstract]:Dyestuff wastewater and environmental endocrine disrupting substances are the focus of the current environmental problems because of their high toxicity and difficult degradation. They have a great impact on the ecological environment and human health. Sepiolite, as a cheap clay mineral adsorbent, has been widely used in wastewater treatment, but its hydrophilicity is limited in organic wastewater treatment. In this paper, the adsorption of Congo red and bisphenol A by CTAB (cetyltrimethylammonium bromide) modified sepiolite was studied. It is of great significance to treat the water polluted by dyestuff wastewater and environmental endocrine disrupting substances. (1) using CTAB to modify sepiolite soil organically and reheat it further. A series of modified sepiolite (H-XCEC-S) with CTAB dosage of 0.3n 1.0 times of sepiolite cation exchange capacity (0.3CCEC-S) were prepared, where X indicated that the amount of CTAB was multiple H and S of the cation exchange capacity of sepiolite for activation treatment and sepiolite primordium, respectively. , the preparation conditions are as follows: modification time is 24 h, modification temperature is 30 鈩，

本文編號：2119820