本文選題：載鐵活性炭 + 制備��； 參考：《江西理工大學(xué)》2015年碩士論文

【摘要】：砷是劇毒元素,可對(duì)人、動(dòng)植物造成傷害。水體砷污染已成為一突出問(wèn)題。立足于環(huán)境材料的研發(fā)和應(yīng)用,本文采用高溫蒸發(fā)法和恒溫浸潤(rùn)法改性顆�；钚蕴�,并改變兩種方法中的制備條件、修飾物質(zhì)制備不同的載鐵活性炭吸附劑,選取最佳吸附劑進(jìn)行吸附性能研究并對(duì)其進(jìn)行EDS、SEM、XRD、XPS、FTIR等表征,同時(shí)對(duì)兩類材料吸附砷的鐵效率和穩(wěn)定性進(jìn)行對(duì)比研究。研究結(jié)果表明,高溫蒸發(fā)法的最佳吸附劑是采用2 g Fe SO4·7H2O,添加5 m L H2O2,高溫蒸發(fā)15min制備,命名為Fe(1.39%)-15 min-H2O2,1.39%為鐵含量;恒溫浸潤(rùn)法的最佳吸附劑是采用2 g Fe SO4·7H2O,添加10 m L H2O2,在溫度100℃下浸潤(rùn)24 h制備,命名為Fe(0.485%)-24 h-H2O2.Fe(1.39%)-15 min-H2O2對(duì)砷的最大吸附容量是2.551 mg/g,而Fe(0.485%)-24h-H2O2的吸附容量隨初始濃度增大而增大;兩種材料的吸附容量均隨溫度升高而降低;Fe(1.39%)-15 min-H2O2和Fe(0.485%)-24 h-H2O2吸附砷的平衡時(shí)間分別是24 h、30h;Fe(1.39%)-15 min-H2O2在p H(4~8)內(nèi)穩(wěn)定性和去除效果都很好,而Fe(0.485%)-24 h-H2O2在p H(2~10)內(nèi)去除效果好,但在p H4時(shí),其穩(wěn)定性差。Cl O4-、SO42-、PO43-、Mg2+對(duì)Fe(1.39%)-15 min-H2O2吸附砷有抑制作用,而Ca2+對(duì)其吸附起促進(jìn)作用;SO42-、NO3-、Cl O4-、PO43-對(duì)Fe(0.485%)-24 h-H2O2吸附砷有抑制作用,而Cl-(100 mg/L)、Br O3-、Ca2+、Mg2+對(duì)其吸附起促進(jìn)作用。Fe(1.39%)-15 min-H2O2對(duì)砷的吸附過(guò)程更適合用Frundlich模型來(lái)描述,而Fe(0.485%)-24 h-H2O2更適合用Linear模型;這兩種材料的吸附反應(yīng)都主要是物理吸附,且均是自發(fā)的放熱熵減反應(yīng);準(zhǔn)二級(jí)動(dòng)力學(xué)模型均可以很好的描述這兩種材料對(duì)砷的吸附,且它們的反應(yīng)速率控制階段是外擴(kuò)散階段;兩種材料的解吸率均大于80%。由EDS可知,Fe(1.39%)-15 min-H2O2的Fe原子百分比高于Fe(0.485%)-24 h-H2O2;SEM顯示Fe(0.485%)-24 h-H2O2表面覆蓋厚而均勻的納米羥基鐵,Fe(1.39%)-15 min-H2O2表面覆蓋薄而均勻燒結(jié)扭曲的羥基鐵;由FTIR、XRD、XPS可知,兩種材料表面均存在無(wú)定型的Fe OHSO4和Fe OOH,并且它們表面還存在二價(jià)鐵;恒溫浸潤(rùn)法所制備的吸附劑鐵效率遠(yuǎn)遠(yuǎn)高于高溫蒸發(fā)法;Fe(0.485%)-24 h-H2O2的穩(wěn)定性優(yōu)于Fe(1.39%)-15 min-H2O2,表明制備方法對(duì)鐵效率、穩(wěn)定性有重要的影響。
[Abstract]:Arsenic is a highly toxic element that can cause harm to humans, animals and plants. Water arsenic pollution has become a prominent problem. Based on the research and application of environmental materials, the granular activated carbon was modified by high temperature evaporation method and constant temperature soaking method, and the preparation conditions of the two methods were changed to prepare different adsorbents of iron loaded activated carbon. The optimum adsorbents were selected to study the adsorption properties and the results were characterized by EDSSEMX RDX XPS FT-IR. The iron efficiency and stability of the two kinds of materials on arsenic adsorption were compared. The results show that the best adsorbent for high temperature evaporation method is 2 g FeSO 4 7H 2O, adding 5 mL H 2O 2 and evaporating 15min at high temperature, named Fe 1. 39% -15 min H 2O 2 H 2O 2 1.39% iron content. The best adsorbent for isothermal soaking method is 2 g FeSO 4 7H 2O and 10 mL H 2O 2 at 100 鈩，

本文編號(hào)：2017079