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

【摘要】：納米零價(jià)鐵是一種比表面積大、反應(yīng)活性高的納米材料,常被用于去除水中六價(jià)鉻的研究,由于納米零價(jià)鐵粒徑小、易團(tuán)聚,在實(shí)際工程應(yīng)用中受到了一定的限制。將納米零價(jià)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(dá)的孔道結(jié)構(gòu),有利于納米零價(jià)鐵鐵粒子的固定。將活性炭和納米零價(jià)鐵結(jié)合,能分散負(fù)載的納米零價(jià)鐵顆粒,有效阻止其團(tuán)聚,提高了納米零價(jià)鐵修復(fù)污染物的效率,同時(shí)能夠?qū)Ω邼舛?90-120 mg·L-1)的含六價(jià)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(fù)載納米零價(jià)鐵銅藻基活性炭(NZVI/SAC);將負(fù)載納米零價(jià)鐵前后的銅藻基活性炭應(yīng)用于模擬廢水中的Cr(Ⅵ)去除,考察了不同反應(yīng)條件對反應(yīng)過程的影響,并對去除過程進(jìn)行了動力學(xué)分析和熱力學(xué)分析,同時(shí)通過分別分析溶液中總鉻、六價(jià)鉻的濃度變化和NZVI/SAC去除六價(jià)鉻前后材料表面的XPS譜圖,對六價(jià)鉻的去除機(jī)制進(jìn)行了探討。結(jié)果表明:(1)負(fù)載納米零價(jià)鐵銅藻基活性炭(NZVI/SAC)能夠有效地改善納米鐵團(tuán)聚現(xiàn)象,適用于高濃度(90-120 mg·L-1)六價(jià)鉻工業(yè)廢水的處理,其對六價(jià)鉻的去除效果可滿足國家規(guī)定的六價(jià)鉻排放標(biāo)準(zhǔn),回收效果表明該復(fù)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(fù)合吸附材料。(2)負(fù)載納米零價(jià)鐵銅藻基活性炭的制備條件為焙燒時(shí)間240 min,焙燒溫度300℃,升溫速率10℃·min-1,還原時(shí)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(jìn)行。制備的負(fù)載納米零價(jià)鐵銅藻基活性炭上的納米零價(jià)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(jià)鐵和銅藻基活性炭。(3)當(dāng)NZVI負(fù)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(dá)100%;隨Cr(Ⅵ)初始濃度的增高,去除率逐漸降低。NZVI/SAC通過化學(xué)還原和吸附共同作用將水中的六價(jià)鉻去除,且以化學(xué)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(xué)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(jìn)一步研究其實(shí)用價(jià)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