本文選題：銅藻 + 活性炭�。� 參考：《浙江工業(yè)大學》2015年碩士論文

【摘要】：納米零價鐵是一種比表面積大、反應活性高的納米材料,常被用于去除水中六價鉻的研究,由于納米零價鐵粒徑小、易團聚,在實際工程應用中受到了一定的限制。將納米零價鐵固定在載體上從而提高其分散度是解決這一問題的有效方法。活性炭作為一種良好的載體,性質(zhì)穩(wěn)定,且具有發(fā)達的孔道結(jié)構(gòu),有利于納米零價鐵鐵粒子的固定。將活性炭和納米零價鐵結(jié)合,能分散負載的納米零價鐵顆粒,有效阻止其團聚,提高了納米零價鐵修復污染物的效率,同時能夠?qū)Ω邼舛?90-120 mg·L-1)的含六價鉻工業(yè)廢水高效處理。本文以銅藻基活性炭為載體,分別采用初濕含浸法、中溫焙燒法和液相還原法制備負載納米零價鐵銅藻基活性炭(NZVI/SAC);將負載納米零價鐵前后的銅藻基活性炭應用于模擬廢水中的Cr(Ⅵ)去除,考察了不同反應條件對反應過程的影響,并對去除過程進行了動力學分析和熱力學分析,同時通過分別分析溶液中總鉻、六價鉻的濃度變化和NZVI/SAC去除六價鉻前后材料表面的XPS譜圖,對六價鉻的去除機制進行了探討。結(jié)果表明:(1)負載納米零價鐵銅藻基活性炭(NZVI/SAC)能夠有效地改善納米鐵團聚現(xiàn)象,適用于高濃度(90-120 mg·L-1)六價鉻工業(yè)廢水的處理,其對六價鉻的去除效果可滿足國家規(guī)定的六價鉻排放標準,回收效果表明該復合吸附材料對環(huán)境無次級污染且性能穩(wěn)定,是一種高性能的復合吸附材料。(2)負載納米零價鐵銅藻基活性炭的制備條件為焙燒時間240 min,焙燒溫度300℃,升溫速率10℃·min-1,還原時間120 min,還原溫度5℃,原料摩爾比為1:5,制備過程在無氧條件下進行。制備的負載納米零價鐵銅藻基活性炭上的納米零價鐵顆粒以50-150 nm球狀形態(tài)存在,且其吸附性能明顯優(yōu)于普通鐵粉、納米零價鐵和銅藻基活性炭。(3)當NZVI負載量為30%、pH為2、溫度為30℃、用量為2 g·L-1條件下NZVI/SAC可在10 min內(nèi)快速將100 mg·L-1的Cr(Ⅵ)去除,且去除率達100%;隨Cr(Ⅵ)初始濃度的增高,去除率逐漸降低。NZVI/SAC通過化學還原和吸附共同作用將水中的六價鉻去除,且以化學還原作用為主。(4)NZVI/SAC對水中Cr(Ⅵ)的吸附速率可用偽一級和偽二級動力學模型擬合,吸附等溫線可用于Langmuir和Freundlich型吸附等溫模型擬合。(5)NZVI/SAC對水中的Cr(Ⅵ)具有良好的選擇性,且在處理過程中對Ni2+有一定的去除能力,為進一步研究其實用價值提供了一定的理論依據(jù)。
[Abstract]:Nanocrystalline zero-valent iron is a kind of nano-material with large specific surface area and high reactive activity. It is often used to remove hexavalent chromium from water. Due to its small particle size and easy agglomeration, it is limited in practical application. It is an effective way to solve this problem by immobilization of nanometer zero valent iron onto the carrier to improve its dispersion. As a good carrier, activated carbon has stable properties and developed pore structure, which is conducive to the immobilization of iron nanoparticles with zero valence. The combination of activated carbon and nanometer zero-valent iron can disperse the loaded nano-zero-valent iron particles, effectively prevent their agglomeration, and improve the efficiency of remediation of pollutants by nano-zero-valent iron. At the same time, it can efficiently treat the wastewater containing hexavalent chromium with high concentration of 90 ~ 120 mg / L ~ (-1). In this paper, the copper algae-based activated carbon was used as carrier, and the initial wet leaching method was used respectively. NZVI / SACU was prepared by medium temperature roasting and liquid phase reduction method, and the effect of different reaction conditions on the reaction process was investigated by using the Cu (鈪，

本文編號：1929477